/*
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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 java.util.Map;
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import java.util.Set;
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import cn.emay.sdk.util.json.gson.internal.LinkedTreeMap;
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/**
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* A class representing an object type in Json. An object consists of name-value
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* pairs where names are strings, and values are any other type of
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* {@link JsonElement}. This allows for a creating a tree of JsonElements. The
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* member elements of this object are maintained in order they were added.
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*
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* @author Inderjeet Singh
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* @author Joel Leitch
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*/
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public final class JsonObject extends JsonElement {
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private final LinkedTreeMap<String, JsonElement> members = new LinkedTreeMap<String, JsonElement>();
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@Override
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JsonObject deepCopy() {
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JsonObject result = new JsonObject();
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for (Map.Entry<String, JsonElement> entry : members.entrySet()) {
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result.add(entry.getKey(), entry.getValue().deepCopy());
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}
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return result;
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}
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/**
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* Adds a member, which is a name-value pair, to self. The name must be a
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* String, but the value can be an arbitrary JsonElement, thereby allowing you
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* to build a full tree of JsonElements rooted at this node.
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*
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* @param property
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* name of the member.
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* @param value
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* the member object.
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*/
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public void add(String property, JsonElement value) {
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if (value == null) {
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value = JsonNull.INSTANCE;
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}
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members.put(property, value);
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}
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/**
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* Removes the {@code property} from this {@link JsonObject}.
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*
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* @param property
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* name of the member that should be removed.
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* @return the {@link JsonElement} object that is being removed.
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* @since 1.3
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*/
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public JsonElement remove(String property) {
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return members.remove(property);
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}
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/**
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* Convenience method to add a primitive member. The specified value is
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* converted to a JsonPrimitive of String.
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*
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* @param property
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* name of the member.
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* @param value
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* the string value associated with the member.
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*/
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public void addProperty(String property, String value) {
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add(property, createJsonElement(value));
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}
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/**
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* Convenience method to add a primitive member. The specified value is
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* converted to a JsonPrimitive of Number.
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*
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* @param property
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* name of the member.
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* @param value
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* the number value associated with the member.
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*/
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public void addProperty(String property, Number value) {
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add(property, createJsonElement(value));
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}
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/**
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* Convenience method to add a boolean member. The specified value is converted
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* to a JsonPrimitive of Boolean.
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*
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* @param property
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* name of the member.
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* @param value
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* the number value associated with the member.
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*/
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public void addProperty(String property, Boolean value) {
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add(property, createJsonElement(value));
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}
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/**
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* Convenience method to add a char member. The specified value is converted to
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* a JsonPrimitive of Character.
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*
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* @param property
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* name of the member.
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* @param value
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* the number value associated with the member.
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*/
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public void addProperty(String property, Character value) {
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add(property, createJsonElement(value));
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}
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/**
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* Creates the proper {@link JsonElement} object from the given {@code value}
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* object.
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*
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* @param value
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* the object to generate the {@link JsonElement} for
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* @return a {@link JsonPrimitive} if the {@code value} is not null, otherwise a
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* {@link JsonNull}
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*/
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private JsonElement createJsonElement(Object value) {
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return value == null ? JsonNull.INSTANCE : new JsonPrimitive(value);
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}
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/**
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* Returns a set of members of this object. The set is ordered, and the order is
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* in which the elements were added.
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*
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* @return a set of members of this object.
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*/
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public Set<Map.Entry<String, JsonElement>> entrySet() {
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return members.entrySet();
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}
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/**
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* Convenience method to check if a member with the specified name is present in
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* this object.
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*
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* @param memberName
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* name of the member that is being checked for presence.
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* @return true if there is a member with the specified name, false otherwise.
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*/
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public boolean has(String memberName) {
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return members.containsKey(memberName);
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}
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/**
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* Returns the member with the specified name.
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*
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* @param memberName
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* name of the member that is being requested.
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* @return the member matching the name. Null if no such member exists.
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*/
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public JsonElement get(String memberName) {
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return members.get(memberName);
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}
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/**
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* Convenience method to get the specified member as a JsonPrimitive element.
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*
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* @param memberName
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* name of the member being requested.
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* @return the JsonPrimitive corresponding to the specified member.
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*/
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public JsonPrimitive getAsJsonPrimitive(String memberName) {
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return (JsonPrimitive) members.get(memberName);
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}
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/**
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* Convenience method to get the specified member as a JsonArray.
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*
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* @param memberName
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* name of the member being requested.
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* @return the JsonArray corresponding to the specified member.
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*/
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public JsonArray getAsJsonArray(String memberName) {
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return (JsonArray) members.get(memberName);
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}
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/**
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* Convenience method to get the specified member as a JsonObject.
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*
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* @param memberName
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* name of the member being requested.
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* @return the JsonObject corresponding to the specified member.
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*/
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public JsonObject getAsJsonObject(String memberName) {
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return (JsonObject) members.get(memberName);
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}
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@Override
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public boolean equals(Object o) {
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return (o == this) || (o instanceof JsonObject && ((JsonObject) o).members.equals(members));
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}
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@Override
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public int hashCode() {
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return members.hashCode();
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}
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}
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