Ant example source code file (SunJavah.java)

This example Ant source code file (SunJavah.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, can't, classnotfoundexception, classnotfoundexception, commandline, commandline, executejava, executejava, file, implementation_name, io, javahadapter, path, string

The SunJavah.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.javah;

import java.io.File;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.launch.Locator;
import org.apache.tools.ant.taskdefs.ExecuteJava;
import org.apache.tools.ant.taskdefs.optional.Javah;
import org.apache.tools.ant.types.Commandline;
import org.apache.tools.ant.types.Path;


/**
 * Adapter to com.sun.tools.javah.oldjavah.Main or com.sun.tools.javah.Main.
 *
 * @since Ant 1.6.3
 */
public class SunJavah implements JavahAdapter {

    /** the name of the javah adapter - sun */
    public static final String IMPLEMENTATION_NAME = "sun";

    /**
     * Performs the actual compilation.
     * @param javah the calling javah task.
     * @return true if the compilation was successful.
     * @throws BuildException if there is an error.
     * @since Ant 1.6.3
     */
    public boolean compile(Javah javah) throws BuildException {
        Commandline cmd = setupJavahCommand(javah);
        ExecuteJava ej = new ExecuteJava();
        Class c = null;
        try {
            try {
                // first search for the "old" javah class in 1.4.2 tools.jar
                c = Class.forName("com.sun.tools.javah.oldjavah.Main");
            } catch (ClassNotFoundException cnfe) {
                // assume older than 1.4.2 tools.jar
                c = Class.forName("com.sun.tools.javah.Main");
            }
        } catch (ClassNotFoundException ex) {
            throw new BuildException(
                "Can't load javah", ex, javah.getLocation());
        }
        cmd.setExecutable(c.getName());
        ej.setJavaCommand(cmd);
        File f = Locator.getClassSource(c);
        if (f != null) {
            ej.setClasspath(new Path(javah.getProject(), f.getPath()));
        }
        return ej.fork(javah) == 0;
    }

    private Commandline setupJavahCommand(Javah javah) {
        Commandline cmd = new Commandline();

        if (javah.getDestdir() != null) {
            cmd.createArgument().setValue("-d");
            cmd.createArgument().setFile(javah.getDestdir());
        }

        if (javah.getOutputfile() != null) {
            cmd.createArgument().setValue("-o");
            cmd.createArgument().setFile(javah.getOutputfile());
        }

        if (javah.getClasspath() != null) {
            cmd.createArgument().setValue("-classpath");
            cmd.createArgument().setPath(javah.getClasspath());
        }

        if (javah.getVerbose()) {
            cmd.createArgument().setValue("-verbose");
        }
        if (javah.getOld()) {
            cmd.createArgument().setValue("-old");
        }
        if (javah.getForce()) {
            cmd.createArgument().setValue("-force");
        }
        if (javah.getStubs() && !javah.getOld()) {
            throw new BuildException(
                "stubs only available in old mode.", javah.getLocation());
        }

        if (javah.getStubs()) {
            cmd.createArgument().setValue("-stubs");
        }
        Path bcp = new Path(javah.getProject());
        if (javah.getBootclasspath() != null) {
            bcp.append(javah.getBootclasspath());
        }
        bcp = bcp.concatSystemBootClasspath("ignore");
        if (bcp.size() > 0) {
            cmd.createArgument().setValue("-bootclasspath");
            cmd.createArgument().setPath(bcp);
        }

        cmd.addArguments(javah.getCurrentArgs());

        javah.logAndAddFiles(cmd);
        return cmd;
    }

}