com.jayway.maven.plugins.android.common.JarHelper Maven / Gradle / Ivy

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Maven Plugin for Android Development

There is a newer version: 4.0.0-rc.2

package com.jayway.maven.plugins.android.common;

import org.apache.commons.io.IOUtils;
import org.codehaus.plexus.util.IOUtil;

import java.io.*;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

/** Helper class to deal with jar files.
 * @author Johan Lindquist
 */
public class JarHelper {

    public static interface UnjarListener {

        public boolean include(JarEntry jarEntry);
    }

    /** Unjars the specified jar file into the the specified directory
     *
     * @param jarFile
     * @param outputDirectory
     * @param unjarListener
     * @throws IOException
     */
    public static void unjar(JarFile jarFile, File outputDirectory,UnjarListener unjarListener)
            throws IOException {
        for (Enumeration en = jarFile.entries(); en.hasMoreElements(); ) {
            JarEntry entry = (JarEntry) en.nextElement();
            File entryFile = new File(outputDirectory, entry.getName());
            if (unjarListener.include(entry)) {
                // Create the output directory if need be
                if (!entryFile.getParentFile().exists()) {
                    if (!entryFile.getParentFile().mkdirs()) {
                        throw new IOException("Error creating output directory: " +entryFile.getParentFile());
                    }
                }

                // If the entry is an actual file, unzip that too
                if (!entry.isDirectory()) {
                    final InputStream in = jarFile.getInputStream(entry);
                    try {
                        final OutputStream out = new FileOutputStream(entryFile);
                        try {
                            IOUtil.copy(in, out);
                        } finally {
                            IOUtils.closeQuietly(out);
                        }
                    } finally {
                        IOUtils.closeQuietly(in);
                    }
                }
            }
        }
    }

}