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/**
 * 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.xbean.classloader;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.jar.JarFile;

/**
 * @author Dain Sundstrom
 */
public final class IoUtil {

	private IoUtil() {
	}

	public static byte[] getBytes(InputStream inputStream) throws IOException {
		try {
			byte[] buffer = new byte[4096];
			ByteArrayOutputStream out = new ByteArrayOutputStream();
			for (int count = inputStream.read(buffer); count >= 0; count = inputStream.read(buffer)) {
				out.write(buffer, 0, count);
			}
			byte[] bytes = out.toByteArray();
			return bytes;
		} finally {
			close(inputStream);
		}
	}

	public static void flush(OutputStream outputStream) {
		if (outputStream != null) {
			try {
				outputStream.flush();
			} catch (Exception ignored) {
			}
		}
	}

	public static void close(JarFile jarFile) {
		if (jarFile != null) {
			try {
				jarFile.close();
			} catch (Exception ignored) {
			}
		}
	}

	public static void close(InputStream inputStream) {
		if (inputStream != null) {
			try {
				inputStream.close();
			} catch (Exception ignored) {
			}
		}
	}

	public static void close(OutputStream outputStream) {
		if (outputStream != null) {
			try {
				outputStream.close();
			} catch (Exception ignored) {
			}
		}
	}

	public static final class EmptyInputStream extends InputStream {
		public int read() {
			return -1;
		}

		public int read(byte b[], int off, int len) {
			return -1;
		}

		public long skip(long n) {
			return 0;
		}
	}
}