/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * 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 java.io.File;

import java.io.IOException;

import java.io.UncheckedIOException;

import java.net.URI;

import java.net.URISyntaxException;

import java.nio.file.FileSystem;

import java.nio.file.FileSystems;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.StandardCopyOption;

import java.util.Collections;

import java.util.stream.Stream;

import org.apache.tools.ant.BuildException;

import org.apache.tools.ant.Task;

public class DumpClassesTask extends Task {

    private String moduleName;

    private File dir;

    public void setModuleName(String moduleName) {

        this.moduleName = moduleName;

    }

    public void setDestDir(File dir) {

        this.dir = dir;

    }

    @Override

    public void execute() {

        try (FileSystem fs = FileSystems.newFileSystem(new URI("jrt:/"), Collections.emptyMap(), DumpClassesTask.class.getClassLoader())) {

            Path source = fs.getPath("modules", moduleName);

            Path target = dir.toPath();

            try (Stream<Path> content = Files.walk(source)) {

                content.filter(Files :: isRegularFile)

                       .forEach(p -> {

                    try {

                        Path targetFile = target.resolve(source.relativize(p).toString());

                        if (!Files.exists(targetFile) || Files.getLastModifiedTime(targetFile).compareTo(Files.getLastModifiedTime(source)) < 0) {

                            Files.createDirectories(targetFile.getParent());

                            Files.copy(p, targetFile, StandardCopyOption.REPLACE_EXISTING);

                        }

                    } catch (IOException ex) {

                        throw new UncheckedIOException(ex);

                    }

                });

            }

        } catch (URISyntaxException | IOException | UncheckedIOException ex) {

            throw new BuildException(ex);

        }

    }

}