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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.portal.search.buffer;

import com.liferay.portal.kernel.util.AutoResetThreadLocal;

import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;

/**
 * @author Michael C. Han
 */
public class IndexerRequestBuffer {

	public static IndexerRequestBuffer create() {
		List indexerRequestBuffers =
			_indexerRequestBuffersThreadLocal.get();

		IndexerRequestBuffer indexerRequestBuffer = new IndexerRequestBuffer();

		indexerRequestBuffers.add(indexerRequestBuffer);

		return indexerRequestBuffer;
	}

	public static IndexerRequestBuffer get() {
		List indexerRequestBuffers =
			_indexerRequestBuffersThreadLocal.get();

		if (indexerRequestBuffers.isEmpty()) {
			return null;
		}

		return indexerRequestBuffers.get(indexerRequestBuffers.size() - 1);
	}

	public static IndexerRequestBuffer remove() {
		List indexerRequestBuffers =
			_indexerRequestBuffersThreadLocal.get();

		if (indexerRequestBuffers.isEmpty()) {
			return null;
		}

		return indexerRequestBuffers.remove(indexerRequestBuffers.size() - 1);
	}

	public void add(IndexerRequest indexerRequest) {
		_indexerRequests.put(indexerRequest, indexerRequest);
	}

	public void clear() {
		_indexerRequests.clear();
	}

	public Collection getIndexerRequests() {
		return _indexerRequests.values();
	}

	public boolean isEmpty() {
		return _indexerRequests.isEmpty();
	}

	public void remove(IndexerRequest indexerRequest) {
		_indexerRequests.remove(indexerRequest);
	}

	public int size() {
		return _indexerRequests.size();
	}

	private static final ThreadLocal>
		_indexerRequestBuffersThreadLocal =
			new AutoResetThreadLocal>(
				IndexerRequestBuffer.class +
					"._indexerRequestBuffersThreadLocal") {

				@Override
				protected List initialValue() {
					return new ArrayList<>();
				}

			};

	private final LinkedHashMap
		_indexerRequests = new LinkedHashMap<>();

}