de.flapdoodle.embedmongo.Files.java Source code

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Here is the source code for de.flapdoodle.embedmongo.Files.java

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/**
 * Copyright (C) 2011
 *   Michael Mosmann <michael@mosmann.de>
 *   Martin Jhren <m.joehren@googlemail.com>
 *
 * 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 de.flapdoodle.embedmongo;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.UUID;
import java.util.logging.Logger;

import org.apache.commons.io.FileUtils;

public class Files {

    private static final Logger _logger = Logger.getLogger(Files.class.getName());

    private Files() {

    }

    public static File createTempFile(String tempFileName) throws IOException {
        File tempDir = new File(System.getProperty("java.io.tmpdir"));
        File tempFile = new File(tempDir, tempFileName);
        if (!tempFile.createNewFile())
            throw new IOException("Could not create Tempfile: " + tempFile);
        return tempFile;
    }

    public static File createOrCheckDir(String dir) throws IOException {
        File tempFile = new File(dir);
        if ((tempFile.exists()) && (tempFile.isDirectory()))
            return tempFile;
        if (!tempFile.mkdir())
            throw new IOException("Could not create Tempdir: " + tempFile);
        return tempFile;
    }

    public static File createOrCheckUserDir(String prefix) throws IOException {
        File tempDir = new File(System.getProperty("user.home"));
        File tempFile = new File(tempDir, prefix);
        if ((tempFile.exists()) && (tempFile.isDirectory()))
            return tempFile;
        if (!tempFile.mkdir())
            throw new IOException("Could not create Tempdir: " + tempFile);
        return tempFile;
    }

    public static File createTempDir(String prefix) throws IOException {
        File tempDir = new File(System.getProperty("java.io.tmpdir"));
        File tempFile = new File(tempDir, prefix + "-" + UUID.randomUUID().toString());
        if (!tempFile.mkdir())
            throw new IOException("Could not create Tempdir: " + tempFile);
        return tempFile;
    }

    public static boolean forceDelete(File fileOrDir) {
        boolean ret = false;

        try {
            if (fileOrDir != null) {
                FileUtils.forceDelete(fileOrDir);
                _logger.info("Could delete " + fileOrDir);
                ret = true;
            }
        } catch (IOException e) {
            _logger.warning("Could not delete " + fileOrDir + ". Will try to delete it again when program exits.");
            try {
                FileUtils.forceDeleteOnExit(fileOrDir);
                ret = true;
            } catch (IOException ioe) {
                _logger.severe("Could not delete " + fileOrDir);
                throw new IllegalStateException("Could not delete " + fileOrDir);
            }
        }

        return ret;
    }

    public static void write(InputStream in, long size, File output) throws IOException {
        FileOutputStream out = new FileOutputStream(output);

        try {
            byte[] buf = new byte[1024 * 16];
            int read;
            int left = buf.length;
            if (left > size)
                left = (int) size;
            while ((read = in.read(buf, 0, left)) != -1) {

                out.write(buf, 0, read);

                size = size - read;
                if (left > size)
                    left = (int) size;
                //            System.out.print("+");
            }
        } finally {
            out.close();
        }
    }

    public static boolean moveFile(File source, File destination) {
        if (!source.renameTo(destination)) {
            // move konnte evtl. nicht durchgefhrt werden
            try {
                copyFile(source, destination);
                return source.delete();
            } catch (IOException iox) {
                return false;
            }
        }
        return true;
    }

    private static void copyFile(File source, File destination) throws IOException {
        FileInputStream reader = null;
        FileOutputStream writer = null;
        try {
            reader = new FileInputStream(source);
            writer = new FileOutputStream(destination);

            int read;
            byte[] buf = new byte[512];
            while ((read = reader.read(buf)) != -1) {
                writer.write(buf, 0, read);
            }

        } finally {
            if (reader != null)
                reader.close();
            if (writer != null)
                writer.close();
        }
    }

}