/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package anttasks;

import genstubs.GenStubs;

import java.io.*;

import java.util.*;

import org.apache.tools.ant.BuildException;

import org.apache.tools.ant.DirectoryScanner;

import org.apache.tools.ant.taskdefs.MatchingTask;

import org.apache.tools.ant.types.Path;

import org.apache.tools.ant.types.Reference;

/**

 * Files are specified with an implicit fileset, using srcdir as a base directory.

 * The set of files to be included is specified with an includes attribute or

 * nested <includes> set. However, unlike a normal fileset, an empty includes attribute

 * means "no files" instead of "all files".  The Ant task also accepts "fork=true" and

 * classpath attribute or nested <classpath> element to run GenStubs in a separate VM

 * with the specified path. This is likely necessary if a JDK 7 parser is required to read the

 * JDK 7 input files.

 */

public class GenStubsTask extends MatchingTask {

    private File srcDir;

    private File destDir;

    private boolean fork;

    private Path classpath;

    private String includes;

    public void setSrcDir(File dir) {

        this.srcDir = dir;

    }

    public void setDestDir(File dir) {

        this.destDir = dir;

    }

    public void setFork(boolean v) {

        this.fork = v;

    }

    public void setClasspath(Path cp) {

        if (classpath == null)

            classpath = cp;

        else

            classpath.append(cp);

    }

    public Path createClasspath() {

        if (classpath == null) {

            classpath = new Path(getProject());

        }

        return classpath.createPath();

    }

    public void setClasspathRef(Reference r) {

        createClasspath().setRefid(r);

    }

    public void setIncludes(String includes) {

        super.setIncludes(includes);

        this.includes = includes;

    }

    @Override

    public void execute() {

        if (includes != null && includes.trim().isEmpty())

            return;

        DirectoryScanner s = getDirectoryScanner(srcDir);

        String[] files = s.getIncludedFiles();

//            System.err.println("Ant.execute: srcDir " + srcDir);

//            System.err.println("Ant.execute: destDir " + destDir);

//            System.err.println("Ant.execute: files " + Arrays.asList(files));

        files = filter(srcDir, destDir, files);

        if (files.length == 0)

            return;

        System.out.println("Generating " + files.length + " stub files to " + destDir);

        List<String> classNames = new ArrayList<String>();

        for (String file: files) {

            classNames.add(file.replaceAll(".java$", "").replace('/', '.'));

        }

        if (!fork) {

            GenStubs m = new GenStubs();

            boolean ok = m.run(srcDir.getPath(), destDir, classNames);

            if (!ok)

                throw new BuildException("genstubs failed");

        } else {

            List<String> cmd = new ArrayList<String>();

            String java_home = System.getProperty("java.home");

            cmd.add(new File(new File(java_home, "bin"), "java").getPath());

            if (classpath != null)

                cmd.add("-Xbootclasspath/p:" + classpath);

            cmd.add(GenStubs.class.getName());

            cmd.add("-sourcepath");

            cmd.add(srcDir.getPath());

            cmd.add("-s");

            cmd.add(destDir.getPath());

            cmd.addAll(classNames);

            //System.err.println("GenStubs exec " + cmd);

            ProcessBuilder pb = new ProcessBuilder(cmd);

            pb.redirectErrorStream(true);

            try {

                Process p = pb.start();

                BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));

                try {

                    String line;

                    while ((line = in.readLine()) != null)

                        System.out.println(line);

                } finally {

                    in.close();

                }

                int rc = p.waitFor();

                if (rc != 0)

                    throw new BuildException("genstubs failed");

            } catch (IOException e) {

                throw new BuildException("genstubs failed", e);

            } catch (InterruptedException e) {

                throw new BuildException("genstubs failed", e);

            }

        }

    }

    String[] filter(File srcDir, File destDir, String[] files) {

        List<String> results = new ArrayList<String>();

        for (String f: files) {

            long srcTime = new File(srcDir, f).lastModified();

            long destTime = new File(destDir, f).lastModified();

            if (srcTime > destTime)

                results.add(f);

        }

        return results.toArray(new String[results.size()]);

    }

}