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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.flink.runtime.util;

import org.apache.flink.annotation.Internal;
import org.apache.flink.util.Preconditions;

import java.io.IOException;
import java.io.InputStream;

/**
 * Input stream, that wraps another input stream and forwards all method calls to the wrapped stream.
 */
@Internal
public class ForwardingInputStream extends InputStream {

	private final InputStream delegate;

	public ForwardingInputStream(InputStream delegate) {
		this.delegate = Preconditions.checkNotNull(delegate);
	}

	@Override
	public int read() throws IOException {
		return delegate.read();
	}

	@Override
	public int read(byte[] b) throws IOException {
		return delegate.read(b);
	}

	@Override
	public int read(byte[] b, int off, int len) throws IOException {
		return delegate.read(b, off, len);
	}

	@Override
	public long skip(long n) throws IOException {
		return delegate.skip(n);
	}

	@Override
	public int available() throws IOException {
		return delegate.available();
	}

	@Override
	public void close() throws IOException {
		delegate.close();
	}

	@Override
	public void mark(int readlimit) {
		delegate.mark(readlimit);
	}

	@Override
	public void reset() throws IOException {
		delegate.reset();
	}

	@Override
	public boolean markSupported() {
		return delegate.markSupported();
	}
}