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Ant example source code file (JlinkTask.java)

This example Ant source code file (JlinkTask.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 - Ant tags/keywords

buildexception, buildexception, exception, file, io, jlinktask, jlinktask, matchingtask, path, path, please, please

The JlinkTask.java 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
 *
 *      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.apache.tools.ant.taskdefs.optional.jlink;

import java.io.File;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.MatchingTask;
import org.apache.tools.ant.types.Path;

/**
 * This class defines objects that can link together various jar and
 * zip files.
 *
 * <p>It is basically a wrapper for the jlink code written originally
 * by <a href="mailto:beard@netscape.com">Patrick Beard.  The
 * classes org.apache.tools.ant.taskdefs.optional.jlink.Jlink and
 * org.apache.tools.ant.taskdefs.optional.jlink.ClassNameReader
 * support this class.</p>
 *
 * <p>For example:
 * <code>
 * <pre>
 * <jlink compress="false" outfile="out.jar"/>
 *   <mergefiles>
 *     <pathelement path="${build.dir}/mergefoo.jar"/>
 *     <pathelement path="${build.dir}/mergebar.jar"/>
 *   </mergefiles>
 *   <addfiles>
 *     <pathelement path="${build.dir}/mac.jar"/>
 *     <pathelement path="${build.dir}/pc.zip"/>
 *   </addfiles>
 * </jlink>
 * </pre>
 * </code>
 *
 * @ant.task ignore="true"
 */
public class JlinkTask extends MatchingTask {

    /**
     * The output file for this run of jlink. Usually a jar or zip file.
     * @param outfile the output file
     */
    public  void setOutfile(File outfile) {
        this.outfile = outfile;
    }

    /**
     * Establishes the object that contains the files to
     * be merged into the output.
     * @return a path to be configured
     */
    public  Path createMergefiles() {
        if (this.mergefiles == null) {
            this.mergefiles = new Path(getProject());
        }
        return this.mergefiles.createPath();
    }

    /**
     * Sets the files to be merged into the output.
     * @param mergefiles a path
     */
    public  void setMergefiles(Path mergefiles) {
        if (this.mergefiles == null) {
            this.mergefiles = mergefiles;
        } else {
            this.mergefiles.append(mergefiles);
        }
    }

    /**
     * Establishes the object that contains the files to
     * be added to the output.
     * @return a path to be configured
     */
    public  Path createAddfiles() {
        if (this.addfiles == null) {
            this.addfiles = new Path(getProject());
        }
        return this.addfiles.createPath();
    }

    /**
     * Sets the files to be added into the output.
     * @param addfiles a path
     */
    public  void setAddfiles(Path addfiles) {
        if (this.addfiles == null) {
            this.addfiles = addfiles;
        } else {
            this.addfiles.append(addfiles);
        }
    }

    /**
     * Defines whether or not the output should be compacted.
     * @param compress a <code>boolean value
     */
    public  void setCompress(boolean compress) {
        this.compress = compress;
    }

    /**
     * Does the adding and merging.
     * @throws BuildException on error
     */
    public  void execute() throws BuildException {
        //Be sure everything has been set.
        if (outfile == null) {
            throw new BuildException("outfile attribute is required! "
                + "Please set.");
        }
        if (!haveAddFiles() && !haveMergeFiles()) {
            throw new BuildException("addfiles or mergefiles required! "
                + "Please set.");
        }
        log("linking:     " + outfile.getPath());
        log("compression: " + compress, Project.MSG_VERBOSE);
        jlink linker = new jlink();
        linker.setOutfile(outfile.getPath());
        linker.setCompression(compress);
        if (haveMergeFiles()) {
            log("merge files: " + mergefiles.toString(), Project.MSG_VERBOSE);
            linker.addMergeFiles(mergefiles.list());
        }
        if (haveAddFiles()) {
            log("add files: " + addfiles.toString(), Project.MSG_VERBOSE);
            linker.addAddFiles(addfiles.list());
        }
        try  {
            linker.link();
        } catch (Exception ex) {
            throw new BuildException(ex, getLocation());
        }
    }

    private boolean haveAddFiles() {
        return haveEntries(addfiles);
    }

    private boolean haveMergeFiles() {
        return haveEntries(mergefiles);
    }

    private boolean haveEntries(Path p) {
        if (p == null) {
            return false;
        }
        if (p.size() > 0) {
            return true;
        }
        return false;
    }

    private  File outfile = null;

    private  Path mergefiles = null;

    private  Path addfiles = null;

    private  boolean compress = false;

}


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