com.google.gwt.json.client.JSONBoolean Maven / Gradle / Ivy
/*
* 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;
/**
* Represents a JSON boolean value.
*/
public class JSONBoolean extends JSONValue {
private static final JSONBoolean FALSE = new JSONBoolean(false);
private static final JSONBoolean TRUE = new JSONBoolean(true);
/**
* Gets a reference to the singleton instance representing either
* true or false.
*
* @param b controls which value to get
* @return if true, the JSONBoolean instance representing
* true is returned; otherwise, the JSONBoolean
* instance representing false is returned
*/
public static JSONBoolean getInstance(boolean b) {
if (b) {
return TRUE;
} else {
return FALSE;
}
}
/**
* Called from {@link #getUnwrapper()}.
*/
private static boolean unwrap(JSONBoolean value) {
return value.value;
}
private final boolean value;
/*
* This private constructor is used to build true and false.
*/
private JSONBoolean(boolean value) {
this.value = value;
}
/**
* Returns true if this is the instance representing "true",
* false otherwise.
*/
public boolean booleanValue() {
return value;
}
/**
* Returns this, as this is a JSONBoolean.
*/
@Override
public JSONBoolean isBoolean() {
return this;
}
/**
* Returns "true" for the true value, and "false" for the false value.
*/
@Override
public String toString() {
return Boolean.toString(value);
}
@Override
native JavaScriptObject getUnwrapper() /*-{
return @com.google.gwt.json.client.JSONBoolean::unwrap(Lcom/google/gwt/json/client/JSONBoolean;);
}-*/;
}