org.fabric3.api.host.util.IOHelper Maven / Gradle / Ivy

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/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * 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.
 *
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 */
package org.fabric3.api.host.util;

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

/**
 * Helper methods for processing with streams.
 */
public final class IOHelper {
    private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;

    private IOHelper() {

    }

    /**
     * Copy bytes from an InputStream to an OutputStream.
     * 
     * This method buffers the input internally, so there is no need to use a BufferedInputStream.
     *
     * @param input  the InputStream to read from
     * @param output the OutputStream to write to
     * @return the number of bytes copied
     * @throws IOException if an I/O error occurs
     */
    public static int copy(InputStream input, OutputStream output) throws IOException {
        byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
        int count = 0;
        int n;
        while (-1 != (n = input.read(buffer))) {
            output.write(buffer, 0, n);
            count += n;
        }
        return count;
    }

    public static void closeQuietly(Closeable closeable) {
        try {
            if (closeable != null) {
                closeable.close();
            }
        } catch (IOException ignore) {
        }
    }

}