com.google.gwt.rpc.client.ast.NullValueCommand Maven / Gradle / Ivy
/*
* Copyright 2009 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.rpc.client.ast;
import com.google.gwt.rpc.client.ast.RpcCommandVisitor.Context;
/**
* Represents a null or undefined value on the client.
*/
public class NullValueCommand extends ScalarValueCommand {
/**
* The singleton instance of NullValueCommand.
*/
public static final NullValueCommand INSTANCE = new NullValueCommand();
private NullValueCommand() {
}
@Override
public Object getValue() {
return null;
}
@Override
public void traverse(RpcCommandVisitor visitor, Context ctx) {
visitor.visit(this, ctx);
visitor.endVisit(this, ctx);
}
}