org.jboss.maven.plugins.retro.util.JarUtil Maven / Gradle / Ivy

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Maven plugin for jboss retro

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package org.jboss.maven.plugins.retro.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;
import java.util.zip.Deflater;

import org.apache.commons.io.FileUtils;

public class JarUtil
{
   public static ArrayList  createJarEntries(File directory) throws IOException
   {
      ArrayList  fileEntries = new ArrayList  ();
      //this.getLog().info("DEBUG: " + directory.getAbsolutePath());
      Collection files = FileUtils.listFiles(directory, null, true);
      for (Object fileObj : files)
      {
         String relativePath = fileObj.toString().replace(directory.getAbsolutePath() + File.separator, "");
         relativePath = relativePath.replace('\\', '/');
         byte[] content = FileUtils.readFileToByteArray((File) fileObj);
         fileEntries.add(new JarFileEntry(relativePath, content));
      }
      return fileEntries;
   }

   public static File createJarFile(String inputPath, String jarFilePath) throws IOException
   {
      File outputDir = new File(inputPath);
      ArrayList  fileEntries = createJarEntries(outputDir);
      Manifest manifest = new Manifest();
      Attributes attributes = manifest.getMainAttributes();
      attributes.putValue("Manifest-Version", "1.0");
      attributes.putValue("Created-By", System.getProperty("java.vm.version") + " ("
            + System.getProperty("java.vm.vendor") + ")");
      JarOutputStream stream = new JarOutputStream(new FileOutputStream(jarFilePath), manifest);
      stream.setLevel(Deflater.BEST_COMPRESSION);
      for (JarFileEntry fileEntry : fileEntries)
      {
         JarEntry jarEntry = new JarEntry(fileEntry.getName());
         stream.putNextEntry(jarEntry);
         stream.write(fileEntry.getContent());
      }
      stream.close();

      return new File(jarFilePath);
   }

}