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Simply utility methods used across other Molindo projects

There is a newer version: 3.0.0

/**
 * Copyright 2010 Molindo GmbH
 *
 * 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 at.molindo.utils.io;

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

public class CompositeInputStream extends InputStream {
	private final InputStream[] _streams;
	private int _current;

	public CompositeInputStream(InputStream... streams) {
		if (streams == null) {
			throw new NullPointerException("streams");
		}
		if (streams.length == 0) {
			throw new IllegalArgumentException("at least one stream required");
		}

		_streams = streams;
		_current = 0;
	}

	public int read() throws IOException {
		int result = _streams[_current].read();
		if (result == -1 && _current < _streams.length - 1)
			result = _streams[++_current].read();
		return result;
	}
}