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OpenSearchServer is a powerful, enterprise-class, search engine program. Using the web user interface, the crawlers (web, file, database, ...) and the REST/RESTFul API you will be able to integrate quickly and easily advanced full-text search capabilities in your application. OpenSearchServer runs on Windows and Linux/Unix/BSD.
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/**   
 * License Agreement for OpenSearchServer
 *
 * Copyright (C) 2008-2012 Emmanuel Keller / Jaeksoft
 * 
 * http://www.open-search-server.com
 * 
 * This file is part of OpenSearchServer.
 *
 * OpenSearchServer 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 3 of the License, or
 *  (at your option) any later version.
 *
 * OpenSearchServer 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 OpenSearchServer. 
 *  If not, see .
 **/

package com.jaeksoft.searchlib.spellcheck;

import org.w3c.dom.Node;
import org.xml.sax.SAXException;

import com.jaeksoft.searchlib.function.expression.SyntaxError;
import com.jaeksoft.searchlib.schema.AbstractField;
import com.jaeksoft.searchlib.schema.SchemaFieldList;
import com.jaeksoft.searchlib.util.XPathParser;
import com.jaeksoft.searchlib.util.XmlWriter;

public class SpellCheckField extends AbstractField implements
		Comparable {

	/**
	 * 
	 */
	private static final long serialVersionUID = -1417527967951473421L;

	private float minScore;

	private int suggestionNumber;

	private SpellCheckDistanceEnum stringDistance;

	public SpellCheckField() {
		minScore = 0.5F;
		suggestionNumber = 5;
		stringDistance = SpellCheckDistanceEnum.LevensteinDistance;
	}

	public SpellCheckField(SpellCheckField field) {
		super(field);
		this.minScore = field.minScore;
		this.suggestionNumber = field.suggestionNumber;
		this.stringDistance = field.stringDistance;
	}

	public SpellCheckField(String name, float minScore, int suggestionNumber,
			SpellCheckDistanceEnum stringDistance) {
		super(name);
		this.minScore = minScore;
		this.suggestionNumber = suggestionNumber;
		this.stringDistance = stringDistance;
	}

	@Override
	public void copyFrom(SpellCheckField source) {
		super.copyFrom(source);
		this.minScore = source.minScore;
		this.suggestionNumber = source.suggestionNumber;
		this.stringDistance = source.stringDistance;
	}

	@Override
	public SpellCheckField duplicate() {
		return new SpellCheckField(this);
	}

	public float getMinScore() {
		return minScore;
	}

	public void setMinScore(float score) {
		minScore = score;
	}

	public int getSuggestionNumber() {
		return suggestionNumber;
	}

	public void setSuggestionNumber(int n) {
		suggestionNumber = n;
	}

	public static void copySpellCheckFields(Node node, SchemaFieldList source,
			SpellCheckFieldList target) {
		String fieldName = XPathParser.getAttributeString(node, "name");
		String p = XPathParser.getAttributeString(node, "minScore");
		float minScore = 0.5F;
		if (p != null)
			if (p.length() > 0)
				minScore = Float.parseFloat(p);
		int suggestionNumber = XPathParser.getAttributeValue(node,
				"suggestionNumber");
		SpellCheckDistanceEnum distance = SpellCheckDistanceEnum
				.find(XPathParser.getAttributeString(node, "stringDistance"));
		SpellCheckField spellCheckField = new SpellCheckField(source.get(
				fieldName).getName(), minScore, suggestionNumber, distance);
		target.put(spellCheckField);
	}

	public static SpellCheckField buildSpellCheckField(String value,
			boolean multivalued) throws SyntaxError {
		float minScore = 0.5F;
		int suggestionNumber = 5;
		String fieldName = null;

		int i1 = value.indexOf('(');
		if (i1 != -1) {
			fieldName = value.substring(0, i1);
			int i2 = value.indexOf(')', i1);
			if (i2 == -1)
				throw new SyntaxError("closed braket missing");
			int i3 = value.indexOf(',', i2);
			if (i3 == -1)
				throw new SyntaxError("suggestion number missing");
			minScore = Float.parseFloat(value.substring(i1 + 1, i2));
			suggestionNumber = Integer.parseInt(value.substring(i2 + 1, i3));
		} else
			fieldName = value;
		// TODO Support distance
		return new SpellCheckField(fieldName, minScore, suggestionNumber,
				SpellCheckDistanceEnum.LevensteinDistance);
	}

	@Override
	public void writeXmlConfig(XmlWriter xmlWriter) throws SAXException {
		xmlWriter.startElement("spellCheckField", "name", name, "minScore",
				Float.toString(minScore), "suggestionNumber",
				Integer.toString(suggestionNumber), "stringDistance",
				stringDistance.name());
		xmlWriter.endElement();
	}

	@Override
	public int compareTo(SpellCheckField o) {
		int i = super.compareTo(o);
		if (i != 0)
			return i;
		i = Float.compare(minScore, o.minScore);
		if (i != 0)
			return i;
		return suggestionNumber - o.suggestionNumber;
	}

	/**
	 * @return the stringDistance
	 */
	public SpellCheckDistanceEnum getStringDistance() {
		return stringDistance;
	}

	/**
	 * @param stringDistance
	 *            the stringDistance to set
	 */
	public void setStringDistance(SpellCheckDistanceEnum stringDistance) {
		this.stringDistance = stringDistance;
	}
}