IO.java

/*
 * 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.ziplock;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.Flushable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URL;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

/**
 * @version $Revision$ $Date$
 */
public class IO {

    public static String readString(final URL url) throws IOException {
        final InputStream in = url.openStream();
        try {
            final BufferedReader reader = new BufferedReader(new InputStreamReader(in));
            return reader.readLine();
        } finally {
            close(in);
        }
    }

    public static String readString(final File file) throws IOException {
        final FileReader in = new FileReader(file);
        try {
            final BufferedReader reader = new BufferedReader(in);
            return reader.readLine();
        } finally {
            close(in);
        }
    }

    public static String slurp(final String fileName) throws IOException {
        return slurp(new File(fileName));
    }

    public static String slurp(final File file) throws IOException {
        final byte[] bytes = readBytes(file);
        return new String(bytes);
    }

    public static byte[] readBytes(final File file) throws IOException {
        final ByteArrayOutputStream out = new ByteArrayOutputStream();
        copy(file, out);
        return out.toByteArray();
    }

    public static String slurp(final InputStream in) throws IOException {
        final byte[] bytes = readBytes(in);
        return new String(bytes, "UTF-8");
    }

    public static byte[] readBytes(final InputStream in) throws IOException {
        final ByteArrayOutputStream out = new ByteArrayOutputStream();
        copy(in, out);
        return out.toByteArray();
    }

    public static String slurp(final URL url) throws IOException {
        final byte[] bytes = readBytes(url);
        return new String(bytes);
    }

    public static byte[] readBytes(final URL url) throws IOException {
        final ByteArrayOutputStream out = new ByteArrayOutputStream();
        copy(url, out);
        return out.toByteArray();
    }

    public static void writeString(final File file, final String string) throws IOException {
        final FileWriter out = new FileWriter(file);
        try {
            final BufferedWriter bufferedWriter = new BufferedWriter(out);
            try {
                bufferedWriter.write(string);
                bufferedWriter.newLine();
            } finally {
                close(bufferedWriter);
            }
        } finally {
            close(out);
        }
    }

    public static void copy(final File from, final OutputStream to) throws IOException {
        final InputStream read = read(from);
        try {
            copy(read, to);
        } finally {
            close(read);
        }
    }

    public static void copy(final URL from, final OutputStream to) throws IOException {
        final InputStream read = read(from);
        try {
            copy(read, to);
        } finally {
            close(read);
        }
    }

    public static void copy(final InputStream from, final File to) throws IOException {
        final OutputStream write = write(to);
        try {
            copy(from, write);
        } finally {
            close(write);
        }
    }

    public static void copy(final InputStream from, final File to, final boolean append) throws IOException {
        final OutputStream write = write(to, append);
        try {
            copy(from, write);
        } finally {
            close(write);
        }
    }

    public static void copy(final InputStream from, final OutputStream to) throws IOException {
        final byte[] buffer = new byte[1024];
        int length = 0;
        while ((length = from.read(buffer)) != -1) {
            to.write(buffer, 0, length);
        }
        to.flush();
    }

    public static ZipOutputStream zip(final File file) throws IOException {
        final OutputStream write = write(file);
        return new ZipOutputStream(write);
    }

    public static ZipInputStream unzip(final File file) throws IOException {
        final InputStream read = read(file);
        return new ZipInputStream(read);
    }

    public static void close(final Closeable closeable) throws IOException {
        if (closeable == null) {
            return;
        }
        try {
            if (Flushable.class.isInstance(closeable)) {
                Flushable.class.cast(closeable).flush();
            }
        } catch (final IOException e) {
            // no-op
        }
        try {
            closeable.close();
        } catch (final IOException e) {
            // no-op
        }
    }

    public static boolean delete(final File file) {
        if (file == null) {
            return false;
        }
        if (!file.delete()) {
            System.err.println("Delete failed " + file.getAbsolutePath());
            return false;
        }

        return true;
    }

    public static OutputStream write(final File destination) throws FileNotFoundException {
        final OutputStream out = new FileOutputStream(destination);
        return new BufferedOutputStream(out, 32768);
    }

    public static OutputStream write(final File destination, final boolean append) throws FileNotFoundException {
        final OutputStream out = new FileOutputStream(destination, append);
        return new BufferedOutputStream(out, 32768);
    }

    public static InputStream read(final File source) throws FileNotFoundException {
        final InputStream in = new FileInputStream(source);
        return new BufferedInputStream(in, 32768);
    }
    public static InputStream read(final URL source) throws IOException {
        final InputStream in = source.openStream();
        return new BufferedInputStream(in, 32768);
    }
}