org.apache.clerezza.tools.offline.ZipCreationUtil Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of tools.offline Show documentation
The core part of SCB Web Access
There is a newer version: 1.0.0
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.clerezza.tools.offline;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import org.wymiwyg.commons.util.dirbrowser.PathNode;

/**
 *
 * @author reto
 */
class ZipCreationUtil {
    static byte[] createZip(PathNode rootNode) throws IOException {
        ByteArrayOutputStream result = new ByteArrayOutputStream();
            ZipOutputStream compressedTcs = new ZipOutputStream(result);
            archive(compressedTcs, rootNode);
            compressedTcs.close();
        return result.toByteArray();
    }

    private static void archive(ZipOutputStream compressedTcs,
            PathNode pathNode) throws IOException {
        if (pathNode.isDirectory()) {
            //multi-path node doesn't prevent duplicate in versions previous to
            //0.8
            Set childNames = new HashSet(Arrays.asList(pathNode.list()));
            for (String childName : childNames) {
                archive(compressedTcs, pathNode.getSubPath(childName));
            }
        } else {
            compressedTcs.putNextEntry(new ZipEntry(removeLeadingSlash(pathNode.getPath())));
            final int BUF_SIZE = 2048;
            byte buffer[] = new byte[BUF_SIZE];
            InputStream in = pathNode.getInputStream();
            int count;
            while ((count = in.read(buffer, 0, BUF_SIZE)) != -1) {
                compressedTcs.write(buffer, 0, count);
            }
        }
    }

    private static String removeLeadingSlash(String string) {
        if (string.length() > 0 && string.charAt(0) == '/') {
            return string.substring(1);
        } else {
            return string;
        }
    }
}