org.neo4j.ha.upgrade.Utils.java Source code

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Here is the source code for org.neo4j.ha.upgrade.Utils.java

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/*
 * Copyright (c) 2002-2015 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.ha.upgrade;

import java.io.File;
import java.io.FileFilter;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import org.neo4j.io.fs.FileUtils;

import static java.lang.Runtime.getRuntime;
import static java.util.Arrays.asList;
import static org.apache.commons.io.FileUtils.copyURLToFile;
import static org.apache.commons.io.IOUtils.closeQuietly;
import static org.apache.commons.io.IOUtils.copy;
import static org.neo4j.io.fs.FileUtils.deleteFile;
import static org.neo4j.io.fs.FileUtils.deleteRecursively;
import static org.neo4j.io.fs.FileUtils.moveFile;

public class Utils {
    private Utils() {
    }

    public static String assembleClassPathFromPackage(File directory) {
        List<File> jarFiles = new ArrayList<File>();
        FileFilter jarFilter = new FileFilter() {
            @Override
            public boolean accept(File file) {
                return file.isFile() && file.getName().endsWith(".jar");
            }
        };
        gatherFiles(jarFiles, directory, jarFilter);

        StringBuilder classpath = new StringBuilder();
        for (File file : jarFiles)
            classpath.append(classpath.length() > 0 ? File.pathSeparator : "").append(file.getAbsolutePath());
        return classpath.toString();
    }

    private static void gatherFiles(List<File> jarFiles, File directory, FileFilter filter) {
        for (File file : directory.listFiles()) {
            if (file.isDirectory())
                gatherFiles(jarFiles, file, filter);
            else if (filter.accept(file))
                jarFiles.add(file);
        }
    }

    public static File downloadAndUnpack(String url, File targetDirectory, String downloadedFileName)
            throws IOException {
        URL website = new URL(url);
        File downloaded = new File(targetDirectory, downloadedFileName + ".zip");
        if (!downloaded.exists()) {
            File tmpDownload = new File(downloaded.getAbsolutePath() + ".tmp");
            deleteFile(tmpDownload);
            copyURLToFile(website, tmpDownload, 5000, 10000);
            moveFile(tmpDownload, downloaded);
        }

        File unpacked = new File(targetDirectory, downloadedFileName);
        if (!unpacked.exists()) {
            File tmpUnpack = new File(unpacked.getAbsolutePath() + "-tmp");
            deleteRecursively(tmpUnpack);
            tmpUnpack.mkdirs();
            unzip(downloaded, tmpUnpack);
            FileUtils.moveFile(tmpUnpack, unpacked);
        }
        return unpacked;
    }

    public static List<File> unzip(File zipFile, File targetDir) throws IOException {
        List<File> files = new ArrayList<File>();
        ZipFile zip = new ZipFile(zipFile);
        try {
            zip = new ZipFile(zipFile);
            for (ZipEntry entry : Collections.list(zip.entries())) {
                File target = new File(targetDir, entry.getName());
                target.getParentFile().mkdirs();
                if (!entry.isDirectory()) {
                    InputStream input = zip.getInputStream(entry);
                    try {
                        copyInputStreamToFile(input, target);
                        files.add(target);
                    } finally {
                        closeQuietly(input);
                    }
                }
            }
            return files;
        } finally {
            zip.close();
        }
    }

    public static void copyInputStreamToFile(InputStream stream, File target) throws IOException {
        OutputStream out = null;
        try {
            out = new FileOutputStream(target);
            copy(stream, out);
        } finally {
            closeQuietly(out);
        }
    }

    public static Process execJava(String classPath, String mainClass, String... args) throws Exception {
        List<String> allArgs = new ArrayList<String>(asList("java", "-cp", classPath, mainClass));
        allArgs.addAll(asList(args));
        return getRuntime().exec(allArgs.toArray(new String[0]));
    }

}