Groovy example source code file (EmptyExpression.java)

This example Groovy source code file (EmptyExpression.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

emptyexpression, emptyexpression, expression, expression, instance, instance

The Groovy EmptyExpression.java source code

/*
 * Copyright 2003-2007 the original author or authors.
 *
 * 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 org.codehaus.groovy.ast.expr;

import org.codehaus.groovy.ast.GroovyCodeVisitor;

/**
 * This class is a place holder for an empty expression. 
 * Empty expression are used in closures lists like (;). During
 * class Generation this expression should be either ignored or
 * replace with a null value.
 *   
 * @author Jochen Theodorou
 * @see org.codehaus.groovy.ast.stmt.EmptyStatement
 */
public class EmptyExpression extends Expression {
    public static final EmptyExpression INSTANCE = new EmptyExpression();

    public Expression transformExpression(ExpressionTransformer transformer) {
        return this;
    }

    public void visit(GroovyCodeVisitor visitor) {
        return;
    }
}