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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, exception, file, file, hasfreespace, io, java5, please, reflectwrapper, reflectwrapper, string, 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.




 * <hasfreespace>
 * <p>Condition returns true if selected partition 
 * has the requested space, false otherwise.</p>
 * @since Ant 1.7
public class HasFreeSpace implements Condition {

    private String partition;
    private String needed;

    public boolean eval() throws BuildException {
        try {
            if (JavaEnvUtils.isAtLeastJavaVersion("1.6")) {
                //reflection to avoid bootstrap/build problems
                File fs = new File(partition);
                ReflectWrapper w = new ReflectWrapper(fs);
                long free = ((Long)w.invoke("getFreeSpace")).longValue();
                return free >= StringUtils.parseHumanSizes(needed);
            } else {
                throw new BuildException("HasFreeSpace condition not supported on Java5 or less.");
        } catch (Exception e) {
            throw new BuildException(e);

    private void validate() throws BuildException {
        if(null == partition) {
            throw new BuildException("Please set the partition attribute.");
        if(null == needed) {
            throw new BuildException("Please set the needed attribute.");
     * The partition/device to check
     * @return
    public String getPartition() {
        return partition;

    public void setPartition(String partition) {
        this.partition = partition;

     * The amount of free space required
     * @return the amount required
    public String getNeeded() {
        return needed;

    public void setNeeded(String needed) {
        this.needed = needed;

Other Ant examples (source code examples)

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

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