Ant example source code file (Jikes.java)

This example Ant source code file (Jikes.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, error, execute, file, io, ioexception, jikes, jikes, jikesoutputparser, printwriter, printwriter, project, project, string, string, util

The Jikes.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;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Random;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.util.FileUtils;

/**
 * Encapsulates a Jikes compiler, by directly executing an external
 * process.
 *
 * <p>As of Ant 1.2, this class is considered to be dead code
 * by the Ant developers and is unmaintained.  Don't use
 * it.</strong>

 *
 * @deprecated since 1.2.
 *             Merged into the class Javac.
 */
public class Jikes {

    // CheckStyle:VisibilityModifier OFF - bc
    protected JikesOutputParser jop;
    protected String command;
    protected Project project;
    // CheckStyle:VisibilityModifier ON

    /**
     * Constructs a new Jikes object.
     * @param jop      Parser to send jike's output to
     * @param command  name of jikes executable
     * @param project  the current project
     */
    protected Jikes(JikesOutputParser jop, String command, Project project) {
        super();

        System.err.println("As of Ant 1.2 released in October 2000, "
            + "the Jikes class");
        System.err.println("is considered to be dead code by the Ant "
            + "developers and is unmaintained.");
        System.err.println("Don\'t use it!");

        this.jop = jop;
        this.command = command;
        this.project = project;
    }

    /**
     * Do the compile with the specified arguments.
     * @param args - arguments to pass to process on command line
     */
    protected void compile(String[] args) {
        String[] commandArray = null;
        File tmpFile = null;

        try {
            String myos = System.getProperty("os.name");

            // Windows has a 32k limit on total arg size, so
            // create a temporary file to store all the arguments

            // There have been reports that 300 files could be compiled
            // so 250 is a conservative approach
            if (myos.toLowerCase().indexOf("windows") >= 0
                && args.length > 250) {
                PrintWriter out = null;
                try {
                    String tempFileName = "jikes"
                        + (new Random(System.currentTimeMillis())).nextLong();
                    tmpFile = new File(tempFileName);
                    out = new PrintWriter(new FileWriter(tmpFile));
                    for (int i = 0; i < args.length; i++) {
                        out.println(args[i]);
                    }
                    out.flush();
                    commandArray = new String[] {command,
                                               "@" + tmpFile.getAbsolutePath()};
                } catch (IOException e) {
                    throw new BuildException("Error creating temporary file",
                                             e);
                } finally {
                    FileUtils.close(out);
                }
            } else {
                commandArray = new String[args.length + 1];
                commandArray[0] = command;
                System.arraycopy(args, 0, commandArray, 1, args.length);
            }

            // We assume, that everything jikes writes goes to
            // standard output, not to standard error. The option
            // -Xstdout that is given to Jikes in Javac.doJikesCompile()
            // should guarantee this. At least I hope so. :)
            try {
                Execute exe = new Execute(jop);
                exe.setAntRun(project);
                exe.setWorkingDirectory(project.getBaseDir());
                exe.setCommandline(commandArray);
                exe.execute();
            } catch (IOException e) {
                throw new BuildException("Error running Jikes compiler", e);
            }
        } finally {
            if (tmpFile != null) {
                tmpFile.delete();
            }
        }
    }
}