/*
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* Copyright (C) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cn.emay.sdk.util.json.gson;
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import static cn.emay.sdk.util.json.gson.Gson.DEFAULT_COMPLEX_MAP_KEYS;
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import static cn.emay.sdk.util.json.gson.Gson.DEFAULT_ESCAPE_HTML;
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import static cn.emay.sdk.util.json.gson.Gson.DEFAULT_JSON_NON_EXECUTABLE;
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import static cn.emay.sdk.util.json.gson.Gson.DEFAULT_LENIENT;
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import static cn.emay.sdk.util.json.gson.Gson.DEFAULT_PRETTY_PRINT;
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import static cn.emay.sdk.util.json.gson.Gson.DEFAULT_SERIALIZE_NULLS;
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import static cn.emay.sdk.util.json.gson.Gson.DEFAULT_SPECIALIZE_FLOAT_VALUES;
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import java.lang.reflect.Type;
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import java.sql.Timestamp;
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import java.text.DateFormat;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import cn.emay.sdk.util.json.gson.internal.$Gson$Preconditions;
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import cn.emay.sdk.util.json.gson.internal.Excluder;
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import cn.emay.sdk.util.json.gson.internal.bind.TypeAdapters;
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import cn.emay.sdk.util.json.gson.reflect.TypeToken;
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import cn.emay.sdk.util.json.gson.stream.JsonReader;
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/**
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* <p>
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* Use this builder to construct a {@link Gson} instance when you need to set
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* configuration options other than the default. For {@link Gson} with default
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* configuration, it is simpler to use {@code new Gson()}. {@code GsonBuilder}
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* is best used by creating it, and then invoking its various configuration
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* methods, and finally calling create.
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* </p>
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*
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* <p>
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* The following is an example shows how to use the {@code GsonBuilder} to
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* construct a Gson instance:
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*
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* <pre>
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* Gson gson = new GsonBuilder().registerTypeAdapter(Id.class, new IdTypeAdapter()).enableComplexMapKeySerialization().serializeNulls().setDateFormat(DateFormat.LONG)
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* .setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE).setPrettyPrinting().setVersion(1.0).create();
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* </pre>
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* </p>
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*
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* <p>
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* NOTES:
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* <ul>
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* <li>the order of invocation of configuration methods does not matter.</li>
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* <li>The default serialization of {@link Date} and its subclasses in Gson does
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* not contain time-zone information. So, if you are using date/time instances,
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* use {@code GsonBuilder} and its {@code setDateFormat} methods.</li>
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* </ul>
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* </p>
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*
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* @author Inderjeet Singh
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* @author Joel Leitch
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* @author Jesse Wilson
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*/
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public final class GsonBuilder {
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private Excluder excluder = Excluder.DEFAULT;
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private LongSerializationPolicy longSerializationPolicy = LongSerializationPolicy.DEFAULT;
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private FieldNamingStrategy fieldNamingPolicy = FieldNamingPolicy.IDENTITY;
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private final Map<Type, InstanceCreator<?>> instanceCreators = new HashMap<Type, InstanceCreator<?>>();
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private final List<TypeAdapterFactory> factories = new ArrayList<TypeAdapterFactory>();
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/**
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* tree-style hierarchy factories. These come after factories for backwards
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* compatibility.
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*/
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private final List<TypeAdapterFactory> hierarchyFactories = new ArrayList<TypeAdapterFactory>();
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private boolean serializeNulls = DEFAULT_SERIALIZE_NULLS;
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private String datePattern;
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private int dateStyle = DateFormat.DEFAULT;
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private int timeStyle = DateFormat.DEFAULT;
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private boolean complexMapKeySerialization = DEFAULT_COMPLEX_MAP_KEYS;
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private boolean serializeSpecialFloatingPointValues = DEFAULT_SPECIALIZE_FLOAT_VALUES;
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private boolean escapeHtmlChars = DEFAULT_ESCAPE_HTML;
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private boolean prettyPrinting = DEFAULT_PRETTY_PRINT;
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private boolean generateNonExecutableJson = DEFAULT_JSON_NON_EXECUTABLE;
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private boolean lenient = DEFAULT_LENIENT;
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/**
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* Creates a GsonBuilder instance that can be used to build Gson with various
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* configuration settings. GsonBuilder follows the builder pattern, and it is
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* typically used by first invoking various configuration methods to set desired
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* options, and finally calling {@link #create()}.
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*/
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public GsonBuilder() {
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}
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/**
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* Configures Gson to enable versioning support.
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*
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* @param ignoreVersionsAfter
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* any field or type marked with a version higher than this value are
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* ignored during serialization or deserialization.
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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*/
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public GsonBuilder setVersion(double ignoreVersionsAfter) {
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excluder = excluder.withVersion(ignoreVersionsAfter);
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return this;
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}
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/**
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* Configures Gson to excludes all class fields that have the specified
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* modifiers. By default, Gson will exclude all fields marked transient or
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* static. This method will override that behavior.
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*
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* @param modifiers
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* the field modifiers. You must use the modifiers specified in the
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* {@link java.lang.reflect.Modifier} class. For example,
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* {@link java.lang.reflect.Modifier#TRANSIENT},
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* {@link java.lang.reflect.Modifier#STATIC}.
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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*/
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public GsonBuilder excludeFieldsWithModifiers(int... modifiers) {
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excluder = excluder.withModifiers(modifiers);
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return this;
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}
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/**
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* Makes the output JSON non-executable in Javascript by prefixing the generated
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* JSON with some special text. This prevents attacks from third-party sites
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* through script sourcing. See
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* <a href="http://code.google.com/p/google-gson/issues/detail?id=42">Gson Issue
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* 42</a> for details.
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*
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @since 1.3
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*/
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public GsonBuilder generateNonExecutableJson() {
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this.generateNonExecutableJson = true;
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return this;
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}
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/**
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* Configures Gson to exclude all fields from consideration for serialization or
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* deserialization that do not have the
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* {@link com.google.gson.annotations.Expose} annotation.
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*
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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*/
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public GsonBuilder excludeFieldsWithoutExposeAnnotation() {
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excluder = excluder.excludeFieldsWithoutExposeAnnotation();
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return this;
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}
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/**
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* Configure Gson to serialize null fields. By default, Gson omits all fields
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* that are null during serialization.
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*
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @since 1.2
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*/
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public GsonBuilder serializeNulls() {
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this.serializeNulls = true;
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return this;
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}
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/**
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* Enabling this feature will only change the serialized form if the map key is
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* a complex type (i.e. non-primitive) in its <strong>serialized</strong> JSON
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* form. The default implementation of map serialization uses {@code toString()}
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* on the key; however, when this is called then one of the following cases
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* apply:
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*
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* <h3>Maps as JSON objects</h3> For this case, assume that a type adapter is
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* registered to serialize and deserialize some {@code Point} class, which
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* contains an x and y coordinate, to/from the JSON Primitive string value
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* {@code "(x,y)"}. The Java map would then be serialized as a
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* {@link JsonObject}.
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*
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* <p>
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* Below is an example:
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*
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* <pre>
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* {
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* @code
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* Gson gson = new GsonBuilder().register(Point.class, new MyPointTypeAdapter()).enableComplexMapKeySerialization().create();
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*
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* Map<Point, String> original = new LinkedHashMap<Point, String>();
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* original.put(new Point(5, 6), "a");
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* original.put(new Point(8, 8), "b");
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* System.out.println(gson.toJson(original, type));
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* }
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* </pre>
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*
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* The above code prints this JSON object:
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*
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* <pre>
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* {@code
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* {
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* "(5,6)": "a",
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* "(8,8)": "b"
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* }
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* }
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* </pre>
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*
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* <h3>Maps as JSON arrays</h3> For this case, assume that a type adapter was
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* NOT registered for some {@code Point} class, but rather the default Gson
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* serialization is applied. In this case, some {@code new Point(2,3)} would
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* serialize as {@code {"x":2,"y":5}}.
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*
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* <p>
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* Given the assumption above, a {@code Map<Point, String>} will be serialize as
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* an array of arrays (can be viewed as an entry set of pairs).
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*
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* <p>
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* Below is an example of serializing complex types as JSON arrays:
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*
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* <pre>
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* {@code
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* Gson gson = new GsonBuilder()
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* .enableComplexMapKeySerialization()
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* .create();
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*
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* Map<Point, String> original = new LinkedHashMap<Point, String>();
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* original.put(new Point(5, 6), "a");
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* original.put(new Point(8, 8), "b");
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* System.out.println(gson.toJson(original, type));
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* }
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*
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* The JSON output would look as follows:
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* <pre> {@code
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* [
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* [
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* {
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* "x": 5,
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* "y": 6
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* },
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* "a"
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* ],
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* [
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* {
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* "x": 8,
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* "y": 8
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* },
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* "b"
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* ]
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* ]
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* }
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* </pre>
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*
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @since 1.7
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*/
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public GsonBuilder enableComplexMapKeySerialization() {
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complexMapKeySerialization = true;
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return this;
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}
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/**
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* Configures Gson to exclude inner classes during serialization.
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*
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @since 1.3
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*/
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public GsonBuilder disableInnerClassSerialization() {
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excluder = excluder.disableInnerClassSerialization();
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return this;
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}
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/**
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* Configures Gson to apply a specific serialization policy for {@code Long} and
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* {@code long} objects.
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*
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* @param serializationPolicy
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* the particular policy to use for serializing longs.
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @since 1.3
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*/
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public GsonBuilder setLongSerializationPolicy(LongSerializationPolicy serializationPolicy) {
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this.longSerializationPolicy = serializationPolicy;
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return this;
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}
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/**
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* Configures Gson to apply a specific naming policy to an object's field during
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* serialization and deserialization.
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*
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* @param namingConvention
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* the JSON field naming convention to use for serialization and
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* deserialization.
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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*/
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public GsonBuilder setFieldNamingPolicy(FieldNamingPolicy namingConvention) {
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this.fieldNamingPolicy = namingConvention;
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return this;
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}
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/**
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* Configures Gson to apply a specific naming policy strategy to an object's
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* field during serialization and deserialization.
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*
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* @param fieldNamingStrategy
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* the actual naming strategy to apply to the fields
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @since 1.3
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*/
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public GsonBuilder setFieldNamingStrategy(FieldNamingStrategy fieldNamingStrategy) {
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this.fieldNamingPolicy = fieldNamingStrategy;
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return this;
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}
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/**
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* Configures Gson to apply a set of exclusion strategies during both
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* serialization and deserialization. Each of the {@code strategies} will be
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* applied as a disjunction rule. This means that if one of the
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* {@code strategies} suggests that a field (or class) should be skipped then
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* that field (or object) is skipped during serialization/deserialization.
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*
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* @param strategies
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* the set of strategy object to apply during object
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* (de)serialization.
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @since 1.4
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*/
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public GsonBuilder setExclusionStrategies(ExclusionStrategy... strategies) {
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for (ExclusionStrategy strategy : strategies) {
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excluder = excluder.withExclusionStrategy(strategy, true, true);
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}
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return this;
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}
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/**
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* Configures Gson to apply the passed in exclusion strategy during
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* serialization. If this method is invoked numerous times with different
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* exclusion strategy objects then the exclusion strategies that were added will
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* be applied as a disjunction rule. This means that if one of the added
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* exclusion strategies suggests that a field (or class) should be skipped then
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* that field (or object) is skipped during its serialization.
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*
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* @param strategy
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* an exclusion strategy to apply during serialization.
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @since 1.7
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*/
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public GsonBuilder addSerializationExclusionStrategy(ExclusionStrategy strategy) {
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excluder = excluder.withExclusionStrategy(strategy, true, false);
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return this;
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}
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/**
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* Configures Gson to apply the passed in exclusion strategy during
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* deserialization. If this method is invoked numerous times with different
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* exclusion strategy objects then the exclusion strategies that were added will
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* be applied as a disjunction rule. This means that if one of the added
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* exclusion strategies suggests that a field (or class) should be skipped then
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* that field (or object) is skipped during its deserialization.
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*
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* @param strategy
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* an exclusion strategy to apply during deserialization.
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @since 1.7
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*/
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public GsonBuilder addDeserializationExclusionStrategy(ExclusionStrategy strategy) {
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excluder = excluder.withExclusionStrategy(strategy, false, true);
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return this;
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}
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/**
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* Configures Gson to output Json that fits in a page for pretty printing. This
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* option only affects Json serialization.
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*
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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*/
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public GsonBuilder setPrettyPrinting() {
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prettyPrinting = true;
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return this;
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}
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/**
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* By default, Gson is strict and only accepts JSON as specified by
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* <a href="http://www.ietf.org/rfc/rfc4627.txt">RFC 4627</a>. This option makes
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* the parser liberal in what it accepts.
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*
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @see JsonReader#setLenient(boolean)
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*/
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public GsonBuilder setLenient() {
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lenient = true;
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return this;
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}
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/**
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* By default, Gson escapes HTML characters such as < > etc. Use this
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* option to configure Gson to pass-through HTML characters as is.
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*
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @since 1.3
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*/
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public GsonBuilder disableHtmlEscaping() {
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this.escapeHtmlChars = false;
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return this;
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}
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/**
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* Configures Gson to serialize {@code Date} objects according to the pattern
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* provided. You can call this method or {@link #setDateFormat(int)} multiple
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* times, but only the last invocation will be used to decide the serialization
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* format.
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*
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* <p>
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* The date format will be used to serialize and deserialize
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* {@link java.util.Date}, {@link java.sql.Timestamp} and {@link java.sql.Date}.
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*
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* <p>
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* Note that this pattern must abide by the convention provided by
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* {@code SimpleDateFormat} class. See the documentation in
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* {@link java.text.SimpleDateFormat} for more information on valid date and
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* time patterns.
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* </p>
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*
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* @param pattern
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* the pattern that dates will be serialized/deserialized to/from
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @since 1.2
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*/
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public GsonBuilder setDateFormat(String pattern) {
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// TODO(Joel): Make this fail fast if it is an invalid date format
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this.datePattern = pattern;
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return this;
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}
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/**
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* Configures Gson to to serialize {@code Date} objects according to the style
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* value provided. You can call this method or {@link #setDateFormat(String)}
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* multiple times, but only the last invocation will be used to decide the
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* serialization format.
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*
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* <p>
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* Note that this style value should be one of the predefined constants in the
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* {@code DateFormat} class. See the documentation in
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* {@link java.text.DateFormat} for more information on the valid style
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* constants.
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* </p>
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*
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* @param style
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* the predefined date style that date objects will be
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* serialized/deserialized to/from
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @since 1.2
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*/
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public GsonBuilder setDateFormat(int style) {
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this.dateStyle = style;
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this.datePattern = null;
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return this;
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}
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/**
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* Configures Gson to to serialize {@code Date} objects according to the style
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* value provided. You can call this method or {@link #setDateFormat(String)}
|
* multiple times, but only the last invocation will be used to decide the
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* serialization format.
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*
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* <p>
|
* Note that this style value should be one of the predefined constants in the
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* {@code DateFormat} class. See the documentation in
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* {@link java.text.DateFormat} for more information on the valid style
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* constants.
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* </p>
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*
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* @param dateStyle
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* the predefined date style that date objects will be
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* serialized/deserialized to/from
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* @param timeStyle
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* the predefined style for the time portion of the date objects
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
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* @since 1.2
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*/
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public GsonBuilder setDateFormat(int dateStyle, int timeStyle) {
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this.dateStyle = dateStyle;
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this.timeStyle = timeStyle;
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this.datePattern = null;
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return this;
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}
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/**
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* Configures Gson for custom serialization or deserialization. This method
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* combines the registration of an {@link TypeAdapter}, {@link InstanceCreator},
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* {@link JsonSerializer}, and a {@link JsonDeserializer}. It is best used when
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* a single object {@code typeAdapter} implements all the required interfaces
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* for custom serialization with Gson. If a type adapter was previously
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* registered for the specified {@code type}, it is overwritten.
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*
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* <p>
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* This registers the type specified and no other types: you must manually
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* register related types! For example, applications registering
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* {@code boolean.class} should also register {@code
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* Boolean.class}.
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*
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* @param type
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* the type definition for the type adapter being registered
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* @param typeAdapter
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* This object must implement at least one of the
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* {@link TypeAdapter}, {@link InstanceCreator},
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* {@link JsonSerializer}, and a {@link JsonDeserializer} interfaces.
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* @return a reference to this {@code GsonBuilder} object to fulfill the
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* "Builder" pattern
|
*/
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@SuppressWarnings({ "unchecked", "rawtypes" })
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public GsonBuilder registerTypeAdapter(Type type, Object typeAdapter) {
|
$Gson$Preconditions.checkArgument(
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typeAdapter instanceof JsonSerializer<?> || typeAdapter instanceof JsonDeserializer<?> || typeAdapter instanceof InstanceCreator<?> || typeAdapter instanceof TypeAdapter<?>);
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if (typeAdapter instanceof InstanceCreator<?>) {
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instanceCreators.put(type, (InstanceCreator) typeAdapter);
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}
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if (typeAdapter instanceof JsonSerializer<?> || typeAdapter instanceof JsonDeserializer<?>) {
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TypeToken<?> typeToken = TypeToken.get(type);
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factories.add(TreeTypeAdapter.newFactoryWithMatchRawType(typeToken, typeAdapter));
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}
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if (typeAdapter instanceof TypeAdapter<?>) {
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factories.add(TypeAdapters.newFactory(TypeToken.get(type), (TypeAdapter) typeAdapter));
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}
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return this;
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}
|
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/**
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* Register a factory for type adapters. Registering a factory is useful when
|
* the type adapter needs to be configured based on the type of the field being
|
* processed. Gson is designed to handle a large number of factories, so you
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* should consider registering them to be at par with registering an individual
|
* type adapter.
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*
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* @since 2.1
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*/
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public GsonBuilder registerTypeAdapterFactory(TypeAdapterFactory factory) {
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factories.add(factory);
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return this;
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}
|
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/**
|
* Configures Gson for custom serialization or deserialization for an
|
* inheritance type hierarchy. This method combines the registration of a
|
* {@link TypeAdapter}, {@link JsonSerializer} and a {@link JsonDeserializer}.
|
* If a type adapter was previously registered for the specified type hierarchy,
|
* it is overridden. If a type adapter is registered for a specific type in the
|
* type hierarchy, it will be invoked instead of the one registered for the type
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* hierarchy.
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*
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* @param baseType
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* the class definition for the type adapter being registered for the
|
* base class or interface
|
* @param typeAdapter
|
* This object must implement at least one of {@link TypeAdapter},
|
* {@link JsonSerializer} or {@link JsonDeserializer} interfaces.
|
* @return a reference to this {@code GsonBuilder} object to fulfill the
|
* "Builder" pattern
|
* @since 1.7
|
*/
|
@SuppressWarnings({ "unchecked", "rawtypes" })
|
public GsonBuilder registerTypeHierarchyAdapter(Class<?> baseType, Object typeAdapter) {
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$Gson$Preconditions.checkArgument(typeAdapter instanceof JsonSerializer<?> || typeAdapter instanceof JsonDeserializer<?> || typeAdapter instanceof TypeAdapter<?>);
|
if (typeAdapter instanceof JsonDeserializer || typeAdapter instanceof JsonSerializer) {
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hierarchyFactories.add(0, TreeTypeAdapter.newTypeHierarchyFactory(baseType, typeAdapter));
|
}
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if (typeAdapter instanceof TypeAdapter<?>) {
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factories.add(TypeAdapters.newTypeHierarchyFactory(baseType, (TypeAdapter) typeAdapter));
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}
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return this;
|
}
|
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/**
|
* Section 2.4 of <a href="http://www.ietf.org/rfc/rfc4627.txt">JSON
|
* specification</a> disallows special double values (NaN, Infinity, -Infinity).
|
* However, <a href=
|
* "http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf">Javascript
|
* specification</a> (see section 4.3.20, 4.3.22, 4.3.23) allows these values as
|
* valid Javascript values. Moreover, most JavaScript engines will accept these
|
* special values in JSON without problem. So, at a practical level, it makes
|
* sense to accept these values as valid JSON even though JSON specification
|
* disallows them.
|
*
|
* <p>
|
* Gson always accepts these special values during deserialization. However, it
|
* outputs strictly compliant JSON. Hence, if it encounters a float value
|
* {@link Float#NaN}, {@link Float#POSITIVE_INFINITY},
|
* {@link Float#NEGATIVE_INFINITY}, or a double value {@link Double#NaN},
|
* {@link Double#POSITIVE_INFINITY}, {@link Double#NEGATIVE_INFINITY}, it will
|
* throw an {@link IllegalArgumentException}. This method provides a way to
|
* override the default behavior when you know that the JSON receiver will be
|
* able to handle these special values.
|
*
|
* @return a reference to this {@code GsonBuilder} object to fulfill the
|
* "Builder" pattern
|
* @since 1.3
|
*/
|
public GsonBuilder serializeSpecialFloatingPointValues() {
|
this.serializeSpecialFloatingPointValues = true;
|
return this;
|
}
|
|
/**
|
* Creates a {@link Gson} instance based on the current configuration. This
|
* method is free of side-effects to this {@code GsonBuilder} instance and hence
|
* can be called multiple times.
|
*
|
* @return an instance of Gson configured with the options currently set in this
|
* builder
|
*/
|
public Gson create() {
|
List<TypeAdapterFactory> factories = new ArrayList<TypeAdapterFactory>();
|
factories.addAll(this.factories);
|
Collections.reverse(factories);
|
factories.addAll(this.hierarchyFactories);
|
addTypeAdaptersForDate(datePattern, dateStyle, timeStyle, factories);
|
|
return new Gson(excluder, fieldNamingPolicy, instanceCreators, serializeNulls, complexMapKeySerialization, generateNonExecutableJson, escapeHtmlChars, prettyPrinting, lenient,
|
serializeSpecialFloatingPointValues, longSerializationPolicy, factories);
|
}
|
|
private void addTypeAdaptersForDate(String datePattern, int dateStyle, int timeStyle, List<TypeAdapterFactory> factories) {
|
DefaultDateTypeAdapter dateTypeAdapter;
|
if (datePattern != null && !"".equals(datePattern.trim())) {
|
dateTypeAdapter = new DefaultDateTypeAdapter(datePattern);
|
} else if (dateStyle != DateFormat.DEFAULT && timeStyle != DateFormat.DEFAULT) {
|
dateTypeAdapter = new DefaultDateTypeAdapter(dateStyle, timeStyle);
|
} else {
|
return;
|
}
|
|
factories.add(TreeTypeAdapter.newFactory(TypeToken.get(Date.class), dateTypeAdapter));
|
factories.add(TreeTypeAdapter.newFactory(TypeToken.get(Timestamp.class), dateTypeAdapter));
|
factories.add(TreeTypeAdapter.newFactory(TypeToken.get(java.sql.Date.class), dateTypeAdapter));
|
}
|
}
|
