com.google.gwt.dev.jjs.ast.JNullLiteral 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.dev.jjs.ast;
import com.google.gwt.dev.jjs.SourceInfo;
import com.google.gwt.dev.jjs.SourceOrigin;
/**
* Java null literal expression.
*/
public class JNullLiteral extends JValueLiteral {
public static final JNullLiteral INSTANCE = new JNullLiteral(
SourceOrigin.UNKNOWN);
private JNullLiteral(SourceInfo sourceInfo) {
super(sourceInfo);
}
@Override
protected
JValueLiteral cloneFrom(JValueLiteral value) {
throw new UnsupportedOperationException();
}
public JType getType() {
return JNullType.INSTANCE;
}
@Override
public Object getValueObj() {
return null;
}
public void traverse(JVisitor visitor, Context ctx) {
if (visitor.visit(this, ctx)) {
}
visitor.endVisit(this, ctx);
}
/**
* Note, if this ever becomes not-a-singleton, we'll need to check the
* SourceInfo == SourceOrigin.UNKNOWN.
*/
private Object readResolve() {
return INSTANCE;
}
}