/*
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* Copyright (C) 2011 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.internal.bind;
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import static cn.emay.sdk.util.json.gson.internal.bind.JsonAdapterAnnotationTypeAdapterFactory.getTypeAdapter;
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import java.io.IOException;
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import java.lang.reflect.Field;
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import java.lang.reflect.Type;
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import java.util.LinkedHashMap;
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import java.util.LinkedList;
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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.FieldNamingStrategy;
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import cn.emay.sdk.util.json.gson.Gson;
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import cn.emay.sdk.util.json.gson.JsonSyntaxException;
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import cn.emay.sdk.util.json.gson.TypeAdapter;
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import cn.emay.sdk.util.json.gson.TypeAdapterFactory;
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import cn.emay.sdk.util.json.gson.annotations.JsonAdapter;
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import cn.emay.sdk.util.json.gson.annotations.SerializedName;
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import cn.emay.sdk.util.json.gson.internal.$Gson$Types;
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import cn.emay.sdk.util.json.gson.internal.ConstructorConstructor;
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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.ObjectConstructor;
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import cn.emay.sdk.util.json.gson.internal.Primitives;
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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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import cn.emay.sdk.util.json.gson.stream.JsonToken;
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import cn.emay.sdk.util.json.gson.stream.JsonWriter;
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/**
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* Type adapter that reflects over the fields and methods of a class.
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*/
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public final class ReflectiveTypeAdapterFactory implements TypeAdapterFactory {
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private final ConstructorConstructor constructorConstructor;
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private final FieldNamingStrategy fieldNamingPolicy;
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private final Excluder excluder;
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public ReflectiveTypeAdapterFactory(ConstructorConstructor constructorConstructor, FieldNamingStrategy fieldNamingPolicy, Excluder excluder) {
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this.constructorConstructor = constructorConstructor;
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this.fieldNamingPolicy = fieldNamingPolicy;
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this.excluder = excluder;
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}
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public boolean excludeField(Field f, boolean serialize) {
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return excludeField(f, serialize, excluder);
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}
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static boolean excludeField(Field f, boolean serialize, Excluder excluder) {
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return !excluder.excludeClass(f.getType(), serialize) && !excluder.excludeField(f, serialize);
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}
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/** first element holds the default name */
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private List<String> getFieldNames(Field f) {
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return getFieldName(fieldNamingPolicy, f);
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}
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/** first element holds the default name */
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static List<String> getFieldName(FieldNamingStrategy fieldNamingPolicy, Field f) {
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SerializedName serializedName = f.getAnnotation(SerializedName.class);
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List<String> fieldNames = new LinkedList<String>();
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if (serializedName == null) {
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fieldNames.add(fieldNamingPolicy.translateName(f));
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} else {
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fieldNames.add(serializedName.value());
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for (String alternate : serializedName.alternate()) {
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fieldNames.add(alternate);
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}
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}
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return fieldNames;
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}
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@Override
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public <T> TypeAdapter<T> create(Gson gson, final TypeToken<T> type) {
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Class<? super T> raw = type.getRawType();
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if (!Object.class.isAssignableFrom(raw)) {
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return null; // it's a primitive!
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}
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ObjectConstructor<T> constructor = constructorConstructor.get(type);
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return new Adapter<T>(constructor, getBoundFields(gson, type, raw));
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}
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private ReflectiveTypeAdapterFactory.BoundField createBoundField(final Gson context, final Field field, final String name, final TypeToken<?> fieldType, boolean serialize, boolean deserialize) {
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final boolean isPrimitive = Primitives.isPrimitive(fieldType.getRawType());
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// special casing primitives here saves ~5% on Android...
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return new ReflectiveTypeAdapterFactory.BoundField(name, serialize, deserialize) {
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final TypeAdapter<?> typeAdapter = getFieldAdapter(context, field, fieldType);
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@SuppressWarnings({ "unchecked", "rawtypes" }) // the type adapter and field type always agree
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@Override
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void write(JsonWriter writer, Object value) throws IOException, IllegalAccessException {
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Object fieldValue = field.get(value);
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TypeAdapter t = new TypeAdapterRuntimeTypeWrapper(context, this.typeAdapter, fieldType.getType());
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t.write(writer, fieldValue);
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}
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@Override
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void read(JsonReader reader, Object value) throws IOException, IllegalAccessException {
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Object fieldValue = typeAdapter.read(reader);
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if (fieldValue != null || !isPrimitive) {
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field.set(value, fieldValue);
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}
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}
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@Override
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public boolean writeField(Object value) throws IOException, IllegalAccessException {
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if (!serialized)
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return false;
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Object fieldValue = field.get(value);
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return fieldValue != value; // avoid recursion for example for Throwable.cause
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}
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};
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}
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TypeAdapter<?> getFieldAdapter(Gson gson, Field field, TypeToken<?> fieldType) {
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JsonAdapter annotation = field.getAnnotation(JsonAdapter.class);
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if (annotation != null) {
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TypeAdapter<?> adapter = getTypeAdapter(constructorConstructor, gson, fieldType, annotation);
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if (adapter != null)
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return adapter;
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}
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return gson.getAdapter(fieldType);
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}
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private Map<String, BoundField> getBoundFields(Gson context, TypeToken<?> type, Class<?> raw) {
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Map<String, BoundField> result = new LinkedHashMap<String, BoundField>();
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if (raw.isInterface()) {
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return result;
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}
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Type declaredType = type.getType();
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while (raw != Object.class) {
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Field[] fields = raw.getDeclaredFields();
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for (Field field : fields) {
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boolean serialize = excludeField(field, true);
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boolean deserialize = excludeField(field, false);
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if (!serialize && !deserialize) {
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continue;
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}
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field.setAccessible(true);
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Type fieldType = $Gson$Types.resolve(type.getType(), raw, field.getGenericType());
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List<String> fieldNames = getFieldNames(field);
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BoundField previous = null;
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for (int i = 0; i < fieldNames.size(); ++i) {
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String name = fieldNames.get(i);
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if (i != 0)
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serialize = false; // only serialize the default name
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BoundField boundField = createBoundField(context, field, name, TypeToken.get(fieldType), serialize, deserialize);
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BoundField replaced = result.put(name, boundField);
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if (previous == null)
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previous = replaced;
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}
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if (previous != null) {
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throw new IllegalArgumentException(declaredType + " declares multiple JSON fields named " + previous.name);
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}
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}
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type = TypeToken.get($Gson$Types.resolve(type.getType(), raw, raw.getGenericSuperclass()));
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raw = type.getRawType();
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}
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return result;
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}
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static abstract class BoundField {
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final String name;
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final boolean serialized;
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final boolean deserialized;
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protected BoundField(String name, boolean serialized, boolean deserialized) {
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this.name = name;
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this.serialized = serialized;
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this.deserialized = deserialized;
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}
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abstract boolean writeField(Object value) throws IOException, IllegalAccessException;
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abstract void write(JsonWriter writer, Object value) throws IOException, IllegalAccessException;
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abstract void read(JsonReader reader, Object value) throws IOException, IllegalAccessException;
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}
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public static final class Adapter<T> extends TypeAdapter<T> {
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private final ObjectConstructor<T> constructor;
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private final Map<String, BoundField> boundFields;
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Adapter(ObjectConstructor<T> constructor, Map<String, BoundField> boundFields) {
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this.constructor = constructor;
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this.boundFields = boundFields;
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}
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@Override
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public T read(JsonReader in) throws IOException {
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if (in.peek() == JsonToken.NULL) {
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in.nextNull();
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return null;
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}
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T instance = constructor.construct();
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try {
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in.beginObject();
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while (in.hasNext()) {
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String name = in.nextName();
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BoundField field = boundFields.get(name);
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if (field == null || !field.deserialized) {
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in.skipValue();
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} else {
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field.read(in, instance);
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}
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}
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} catch (IllegalStateException e) {
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throw new JsonSyntaxException(e);
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} catch (IllegalAccessException e) {
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throw new AssertionError(e);
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}
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in.endObject();
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return instance;
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}
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@Override
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public void write(JsonWriter out, T value) throws IOException {
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if (value == null) {
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out.nullValue();
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return;
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}
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out.beginObject();
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try {
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for (BoundField boundField : boundFields.values()) {
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if (boundField.writeField(value)) {
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out.name(boundField.name);
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boundField.write(out, value);
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}
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}
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} catch (IllegalAccessException e) {
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throw new AssertionError(e);
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}
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out.endObject();
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}
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}
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}
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