IOUtils.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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */
package com.apigee.sdk.apm.http.impl.client.cache;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;

import com.apigee.sdk.apm.http.annotation.Immutable;

@Immutable
class IOUtils {

	static void copy(final InputStream in, final OutputStream out)
			throws IOException {
		byte[] buf = new byte[2048];
		int len;
		while ((len = in.read(buf)) != -1) {
			out.write(buf, 0, len);
		}
	}

	static void closeSilently(final Closeable closable) {
		try {
			closable.close();
		} catch (IOException ignore) {
		}
	}

	static void copyAndClose(final InputStream in, final OutputStream out)
			throws IOException {
		try {
			copy(in, out);
			in.close();
			out.close();
		} catch (IOException ex) {
			closeSilently(in);
			closeSilently(out);
			// Propagate the original exception
			throw ex;
		}
	}

	static void copyFile(final File in, final File out) throws IOException {
		RandomAccessFile f1 = new RandomAccessFile(in, "r");
		RandomAccessFile f2 = new RandomAccessFile(out, "w");
		try {
			FileChannel c1 = f1.getChannel();
			FileChannel c2 = f2.getChannel();
			try {
				c1.transferTo(0, f1.length(), c2);
				c1.close();
				c2.close();
			} catch (IOException ex) {
				closeSilently(c1);
				closeSilently(c2);
				// Propagate the original exception
				throw ex;
			}
			f1.close();
			f2.close();
		} catch (IOException ex) {
			closeSilently(f1);
			closeSilently(f2);
			// Propagate the original exception
			throw ex;
		}
	}

}