org.diffkit.common.DKUnjar.java Source code

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Here is the source code for org.diffkit.common.DKUnjar.java

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/**
 * Copyright 2010-2011 Joseph Panico
 *
 * 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 org.diffkit.common;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;

import org.apache.commons.collections.MapUtils;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.diffkit.util.DKStreamUtil;
import org.diffkit.util.DKStringUtil;

/**
 * @author jpanico
 */
public class DKUnjar {
    private static final Logger LOG = LoggerFactory.getLogger(DKUnjar.class);

    /**
     * closes inputStream_ at the end
     */
    public static void unjar(JarInputStream inputStream_, File outputDir_) throws IOException {
        DKValidate.notNull(inputStream_, outputDir_);
        if (!outputDir_.isDirectory())
            throw new RuntimeException(String.format("directory does not exist->%s", outputDir_));

        JarEntry entry = null;
        while ((entry = inputStream_.getNextJarEntry()) != null) {
            File outFile = new File(outputDir_, entry.getName());
            OutputStream outStream = new BufferedOutputStream(new FileOutputStream(outFile));
            DKStreamUtil.copy(inputStream_, outStream);
            outStream.flush();
            outStream.close();
        }
        inputStream_.close();
    }

    /**
     * N.B. this method is much less efficient than the similar signature without
     * substitutions, so use that if you don't really need substitutions <br>
     * 
     * closes inputStream_ at the end
     */
    public static void unjar(JarInputStream inputStream_, File outputDir_, Map<String, String> substitutions_)
            throws IOException {
        boolean isDebugEnabled = LOG.isDebugEnabled();
        if (isDebugEnabled)
            LOG.debug("substitutions_->{}", substitutions_);

        if (MapUtils.isEmpty(substitutions_))
            unjar(inputStream_, outputDir_);

        DKValidate.notNull(inputStream_, outputDir_);
        if (!outputDir_.isDirectory())
            throw new RuntimeException(String.format("directory does not exist->%s", outputDir_));

        JarEntry entry = null;
        while ((entry = inputStream_.getNextJarEntry()) != null) {
            String contents = IOUtils.toString(inputStream_);
            if (isDebugEnabled)
                LOG.debug("contents->{}", contents);
            contents = DKStringUtil.replaceEach(contents, substitutions_);
            if (isDebugEnabled)
                LOG.debug("substituted contents->{}", contents);
            File outFile = new File(outputDir_, entry.getName());
            FileUtils.writeStringToFile(outFile, contents);
        }
        inputStream_.close();
    }
}