IOUtil.java

/*******************************************************************************
 * Copyright (c) 2013 Hani Naguib.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Hani Naguib - initial API and implementation
 ******************************************************************************/
package com.gvmax.common.util;

import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;

/**
 * IO related utilities.
 * Based on commons-io but stripped down to what I need.
 */
public final class IOUtil {

    /**
     * Utility hidding constructor.
     */
    private IOUtil() {}

    public static void close(Closeable stream) {
        if (stream == null) {
            return;
        }
        try {
            stream.close();
        } catch (IOException e) {
            MiscUtils.emptyBlock();
        }

    }

    public static byte[] toByteArray(InputStream in) throws IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int read = 0;
        byte[] buffer = new byte[1024];
        while (read != -1) {
            read = in.read(buffer);
            if (read != -1) {
                out.write(buffer, 0, read);
            }
        }
        out.close();
        return out.toByteArray();
    }

    public static String toString(InputStream in) throws IOException {
        return toString(in, Constants.UTF8);
    }

    public static String toString(InputStream in, String charset) throws IOException {
        StringWriter out = new StringWriter();
        copy(new InputStreamReader(in, charset), out);
        out.close();
        in.close();
        return out.toString();
    }

    public static int copy(InputStream in, OutputStream out) throws IOException {
        int count = 0;
        int read = 0;
        byte[] buffer = new byte[1024];
        while (read != -1) {
            read = in.read(buffer);
            if (read != -1) {
                count += read;
                out.write(buffer, 0, read);
            }
        }
        return count;
    }

    public static int copy(Reader input, Writer output) throws IOException {
        char[] buffer = new char[1024];
        int count = 0;
        int n = 0;
        while (-1 != (n = input.read(buffer))) {
            output.write(buffer, 0, n);
            count += n;
        }
        return count;
    }

}