de.xwic.appkit.core.remote.client.IoUtil.java Source code

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Here is the source code for de.xwic.appkit.core.remote.client.IoUtil.java

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/*******************************************************************************
 * Copyright 2015 xWic group (http://www.xwic.de)
 *
 * 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.xwic.appkit.core.remote.client;

import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author Alexandru Bledea
 * @since Aug 28, 2014
 */
final class IoUtil {
    private static final Log log = LogFactory.getLog(IoUtil.class);

    private static final int EOF = -1;

    /**
     *
     */
    private IoUtil() {
    }

    /**
     * @param closeMe
     */
    public static void close(final Closeable closeMe) {
        if (null == closeMe) {
            return;
        }
        try {
            closeMe.close();
        } catch (final IOException ex) {
            log.error("Failed to close resource", ex);
        }
    }

    /**
     * @param in
     * @return
     * @throws IOException
     */
    @SuppressWarnings("resource")
    public static byte[] readBytes(final InputStream in) throws IOException {
        final ByteArrayOutputStream bos = new ByteArrayOutputStream();
        try {
            copy(in, bos);
            return bos.toByteArray();
        } finally {
            close(bos);
        }
    }

    /**
     * @param input
     * @param output
     * @param buffer
     * @return
     * @throws IOException
     */
    private static void copy(final InputStream in, final OutputStream out) throws IOException {
        int n;
        final byte[] buffer = new byte[4096];
        while (EOF != (n = in.read(buffer))) {
            out.write(buffer, 0, n);
        }
    }

}