oz.hadoop.yarn.api.utils.JarUtils.java Source code

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Here is the source code for oz.hadoop.yarn.api.utils.JarUtils.java

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/*
 * Copyright 2014 the original author or authors.
 *
 * 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 oz.hadoop.yarn.api.utils;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.StringUtils;

/**
 *
 * @author Oleg Zhurakousky
 *
 */
public class JarUtils {
    private final static Log logger = LogFactory.getLog(JarUtils.class);

    /**
     * Will create a JAR file frombase dir
     *
     * @param source
     * @param jarName
     * @return
     */
    public static File toJar(File source, String jarName) {
        if (!source.isAbsolute()) {
            throw new IllegalArgumentException("Source must be expressed through absolute path");
        }
        StringAssertUtils.assertNotEmptyAndNoSpacesAndEndsWith(jarName, ".jar");
        Manifest manifest = new Manifest();
        manifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0");
        File jarFile = new File(jarName);
        try {
            JarOutputStream target = new JarOutputStream(new FileOutputStream(jarFile), manifest);
            add(source, source.getAbsolutePath().length(), target);
            target.close();
        } catch (Exception e) {
            throw new IllegalStateException(
                    "Failed to create JAR file '" + jarName + "' from " + source.getAbsolutePath(), e);
        }
        return jarFile;
    }

    /**
     *
     * @param source
     * @param lengthOfOriginalPath
     * @param target
     * @throws IOException
     */
    private static void add(File source, int lengthOfOriginalPath, JarOutputStream target) throws IOException {
        BufferedInputStream in = null;
        try {
            String path = source.getAbsolutePath();
            path = path.substring(lengthOfOriginalPath);

            if (source.isDirectory()) {
                String name = path.replace("\\", "/");
                if (!name.isEmpty()) {
                    if (!name.endsWith("/")) {
                        name += "/";
                    }
                    JarEntry entry = new JarEntry(name.substring(1)); // avoiding absolute path warning
                    target.putNextEntry(entry);
                    target.closeEntry();
                }

                for (File nestedFile : source.listFiles()) {
                    add(nestedFile, lengthOfOriginalPath, target);
                }

                return;
            }

            JarEntry entry = new JarEntry(path.replace("\\", "/").substring(1)); // avoiding absolute path warning
            entry.setTime(source.lastModified());
            try {
                target.putNextEntry(entry);
                in = new BufferedInputStream(new FileInputStream(source));

                byte[] buffer = new byte[1024];
                while (true) {
                    int count = in.read(buffer);
                    if (count == -1) {
                        break;
                    }
                    target.write(buffer, 0, count);
                }
                target.closeEntry();
            } catch (Exception e) {
                String message = e.getMessage();
                if (StringUtils.hasText(message)) {
                    if (!message.toLowerCase().contains("duplicate")) {
                        throw new IllegalStateException(e);
                    }
                    logger.warn(message);
                } else {
                    throw new IllegalStateException(e);
                }
            }
        } finally {
            if (in != null)
                in.close();
        }
    }
}