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/*
 * Copyright 2013 serso aka se.solovyev
 *
 * 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.
 *
 * ---------------------------------------------------------------------
 * Contact details
 *
 * Email: [email protected]
 * Site:  http://se.solovyev.org
 */

package org.solovyev.common.text;

import org.solovyev.common.interval.Interval;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Arrays;
import java.util.List;

/**
 * User: serso
 * Date: 9/21/11
 * Time: 12:02 AM
 */
public abstract class AbstractIntervalMapper> implements Mapper> {

	/*
	**********************************************************************
	*
	*                           CONSTANTS
	*
	**********************************************************************
	*/

	@Nonnull
	private static final String DEFAULT_DELIMITER = ";";

	/*
	**********************************************************************
	*
	*                           FIELDS
	*
	**********************************************************************
	*/

	@Nonnull
	private final Formatter formatter;

	@Nonnull
	private final Parser parser;

	@Nonnull
	private final String delimiter;

	// used in getMapper method
	@Nullable
	private Mapper mapper;

	/*
	**********************************************************************
	*
	*                           CONSTRUCTORS
	*
	**********************************************************************
	*/

	protected AbstractIntervalMapper(@Nonnull Formatter formatter, @Nonnull Parser parser, @Nonnull String delimiter) {
		this.formatter = formatter;
		this.parser = parser;
		this.delimiter = delimiter;
	}

	protected AbstractIntervalMapper(@Nonnull Mapper mapper, @Nonnull String delimiter) {
		this.formatter = mapper;
		this.parser = mapper;
		this.delimiter = delimiter;
	}

	protected AbstractIntervalMapper(@Nonnull Formatter formatter, @Nonnull Parser parser) {
		this(formatter, parser, DEFAULT_DELIMITER);
	}

	protected AbstractIntervalMapper(@Nonnull Mapper mapper) {
		this(mapper, DEFAULT_DELIMITER);

	}

	/*
	**********************************************************************
	*
	*                           METHODS
	*
	**********************************************************************
	*/


	@Override
	public final String formatValue(@Nullable Interval interval) throws IllegalArgumentException {
		if (interval != null) {
			return StringCollections.formatValue(Arrays.asList(interval.getLeftLimit(), interval.getRightLimit()), delimiter, this.formatter);
		} else {
			return null;
		}
	}

	@Override
	public final Interval parseValue(@Nullable String s) throws IllegalArgumentException {
		final List list = StringCollections.split(s, delimiter, this.parser);

		assert list.size() == 2 : "Interval contains more than 2 elements!";
		return newInstance(list.get(0), list.get(1));
	}

	@Nonnull
	protected abstract Interval newInstance(@Nullable T left, @Nullable T right);

	@Nonnull
	public final Parser getParser() {
		return parser;
	}

	@Nonnull
	public final Formatter getFormatter() {
		return formatter;
	}

	@Nonnull
	public final Mapper getMapper() {
		if (mapper == null) {
			mapper = CompositeMapper.newInstance(formatter, parser);
		}
		return mapper;
	}
}