/*
 *  JOrtho
 *
 *  Copyright (C) 2005-2008 by i-net software
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License as 
 *  published by the Free Software Foundation; either version 2 of the
 *  License, or (at your option) any later version. 
 *
 *  This program 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
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA.
 *  
 *  Created on 12.12.2007
 */
package com.inet.jortho;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

/**
 * A hash list of Suggestions. The list is cut with a max dissimilarity. If a suggestion already exist then the
 * suggestion with the lower dissimilarity will be hold.
 * 
 * @author Volker Berlin
 */
class Suggestions {
	private final HashMap<Suggestion, Suggestion> map = new HashMap<Suggestion, Suggestion>();
	private final int maxDiff;

	/**
	 * Create a suggestions list. Suggestion with a larger dissimilarity can not be added.
	 * @param maxDiff the max dissimilarity
	 */
	Suggestions(final int maxDiff) {
		this.maxDiff = maxDiff;
	}

	/**
	 * Add a suggestion. 
	 * @param suggestion the suggestion 
	 */
	void add(final Suggestion suggestion) {
		if (suggestion.getDissimilarity() > maxDiff) {
			return;
		}
		final Suggestion oldSuggestion = map.get(suggestion);
		if (oldSuggestion != null && oldSuggestion.getDissimilarity() <= suggestion.getDissimilarity()) {
			return;
		}
		map.put(suggestion, suggestion);
	}

	List<Suggestion> getlist() {
		final ArrayList<Suggestion> list = new ArrayList<Suggestion>();
		for (final Suggestion sugg : map.values()) {
			list.add(sugg);
		}
		return list;
	}

	/**
	 * Get the max dissimilarity. Suggestion with a larger value can not be added.
	 * @return
	 */
	int getMaxDissimilarity() {
		return maxDiff;
	}
}