com.digitalreasoning.herman.JarCreater.java Source code

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Here is the source code for com.digitalreasoning.herman.JarCreater.java

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/**
 * Copyright 2013 Digital Reasoning Systems, Inc.
 *
 * Licensed 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 com.digitalreasoning.herman;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.jar.JarOutputStream;
import java.util.zip.ZipEntry;

import org.apache.commons.io.IOUtils;

public class JarCreater {
    static {
        HermanUrlStreamHandler.register();
    }

    public static class Entry {
        private final String parentFolderName;
        private final String fileName;
        private final URL resource;

        public Entry(String parentFolderName, String fileName, URL resource) {
            this.parentFolderName = parentFolderName.endsWith("/") ? parentFolderName : parentFolderName + "/";
            this.fileName = fileName;
            this.resource = resource;
        }

    }

    public static void createJar(File outputJarFile, List<Entry> entries) throws IOException {
        if (!outputJarFile.getParentFile().exists()) {
            outputJarFile.getParentFile().mkdirs();
        }
        if (!outputJarFile.exists()) {
            outputJarFile.createNewFile();
        }

        FileOutputStream fOut = new FileOutputStream(outputJarFile);
        JarOutputStream jarOut = new JarOutputStream(fOut);
        Set<String> packageSet = new HashSet<String>();
        try {
            for (Entry folderFile : entries) {
                InputStream inputStream = folderFile.resource.openStream();

                try {
                    if (!packageSet.contains(folderFile.parentFolderName)) {
                        jarOut.putNextEntry(new ZipEntry(folderFile.parentFolderName));
                        jarOut.closeEntry();
                        packageSet.add(folderFile.parentFolderName);
                    }

                    jarOut.putNextEntry(new ZipEntry(folderFile.parentFolderName
                            + (folderFile.parentFolderName.endsWith("/") ? "" : "/") + folderFile.fileName));
                    IOUtils.copy(inputStream, jarOut);
                    jarOut.closeEntry();
                } finally {
                    inputStream.close();
                }

            }

        } finally {
            jarOut.close();
            fOut.close();
        }
    }
}