com.google.gwt.json.client.JSONValue.java Source code

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Here is the source code for com.google.gwt.json.client.JSONValue.java

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/*
 * Copyright 2008 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.json.client;

import com.google.gwt.core.client.JavaScriptObject;

/**
 * The superclass of all JSON value types.
 * 
 * @see com.google.gwt.json.client.JSONArray
 * @see com.google.gwt.json.client.JSONBoolean
 * @see com.google.gwt.json.client.JSONNumber
 * @see com.google.gwt.json.client.JSONObject
 * @see com.google.gwt.json.client.JSONString
 */
public abstract class JSONValue {
    /**
     * Not subclassable outside this package.
     */
    JSONValue() {
    }

    /**
     * Returns a non-null reference if this JSONValue is really a JSONArray.
     * 
     * @return a reference to a JSONArray if this JSONValue is a JSONArray or
     *         <code>null</code> otherwise.
     */
    public JSONArray isArray() {
        return null;
    }

    /**
     * Returns a non-null reference if this JSONValue is really a JSONBoolean.
     * 
     * @return a reference to a JSONBoolean if this JSONValue is a JSONBoolean or
     *         <code>null</code> otherwise.
     */
    public JSONBoolean isBoolean() {
        return null;
    }

    /**
     * Returns a non-null reference if this JSONValue is really a JSONNull.
     * 
     * @return a reference to a JSONNull if this JSONValue is a JSONNull or
     *         <code>null</code> otherwise.
     */
    public JSONNull isNull() {
        return null;
    }

    /**
     * Returns a non-null reference if this JSONValue is really a JSONNumber.
     * 
     * @return a reference to a JSONNumber if this JSONValue is a JSONNumber or
     *         <code>null</code> otherwise.
     */
    public JSONNumber isNumber() {
        return null;
    }

    /**
     * Returns non-null if this JSONValue is really a JSONObject.
     * 
     * @return a reference to a JSONObject if this JSONValue is a JSONObject or
     *         <code>null</code> otherwise.
     */
    public JSONObject isObject() {
        return null;
    }

    /**
     * Returns a non-null reference if this JSONValue is really a JSONString.
     * 
     * @return a reference to a JSONString if this JSONValue is a JSONString or
     *         <code>null</code> otherwise.
     */
    public JSONString isString() {
        return null;
    }

    /**
     * Returns a JSON-encoded string for this entity. Use this method to create
     * JSON strings that can be sent from the client to a server.
     */
    @Override
    public abstract String toString();

    /**
     * Internal. Returns a JS func that can unwrap this value.  Used from native
     * code.
     */
    abstract JavaScriptObject getUnwrapper();
}