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Ant example source code file (

This example Ant source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

buildexception, buildexception, condition, isset, isset, no, no, projectcomponent, projectcomponent, string

The source code

 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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
 *  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.



 * Condition that tests whether a given property has been set.
 * @since Ant 1.5
public class IsSet extends ProjectComponent implements Condition {
    private String property;

     * Set the property attribute
     * @param p the property name
    public void setProperty(String p) {
        property = p;

     * @return true if the property exists
     * @exception BuildException if the property attribute is not set
    public boolean eval() throws BuildException {
        if (property == null) {
            throw new BuildException("No property specified for isset "
                                     + "condition");

        return getProject().getProperty(property) != null;


Other Ant examples (source code examples)

Here is a short list of links related to this Ant source code file:

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