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Module containing support classes depending on Java SE 6, Guava 11 and Joda-Time 2.0

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/*
 * Copyright (C) the original author or authors.
 *
 * 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 net.derquinse.common.io;

import static com.google.common.base.Preconditions.checkNotNull;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;

import com.google.common.annotations.Beta;
import com.google.common.io.InputSupplier;

/**
 * An input stream supplier backed by a byte buffer.
 * @author Andres Rodriguez
 */
@Beta
final class ByteBufferInputStreamSupplier implements InputSupplier {
	/** Backing buffer. */
	private final ByteBuffer buffer;

	/**
	 * Constructor.
	 * @param buffer Backing buffer. An sliced view is used as input. The buffer will not be modified
	 *          by this object.
	 */
	ByteBufferInputStreamSupplier(ByteBuffer buffer) {
		this.buffer = checkNotNull(buffer, "The backing buffer must be provided").slice();
	}

	/*
	 * (non-Javadoc)
	 * @see com.google.common.io.InputSupplier#getInput()
	 */
	@Override
	public synchronized InputStream getInput() throws IOException {
		return new ByteBufferInputStream(buffer.duplicate());
	}
}