com.jaeksoft.searchlib.spellcheck.SpellCheck.java Source code

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Here is the source code for com.jaeksoft.searchlib.spellcheck.SpellCheck.java

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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 <http://www.gnu.org/licenses/>.
 **/

package com.jaeksoft.searchlib.spellcheck;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import org.apache.commons.lang.StringUtils;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.spell.SpellChecker;

import com.jaeksoft.searchlib.SearchLibException;
import com.jaeksoft.searchlib.function.expression.SyntaxError;
import com.jaeksoft.searchlib.index.ReaderLocal;
import com.jaeksoft.searchlib.query.ParseException;
import com.jaeksoft.searchlib.request.SpellCheckRequest;

public class SpellCheck implements Iterable<SpellCheckItem> {

    private List<SpellCheckItem> spellCheckItems;

    private String fieldName;

    private String suggestion;

    public SpellCheck(ReaderLocal reader, SpellCheckRequest request, SpellCheckField spellCheckField)
            throws ParseException, SyntaxError, IOException, SearchLibException {
        fieldName = spellCheckField.getName();
        SpellChecker spellchecker = reader.getSpellChecker(fieldName);
        Set<String> wordSet = new LinkedHashSet<String>();

        Set<Term> set = request.getTermSet(spellCheckField.getName());
        for (Term term : set)
            if (term.field().equals(fieldName))
                wordSet.add(term.text());
        int suggestionNumber = spellCheckField.getSuggestionNumber();
        float minScore = spellCheckField.getMinScore();
        synchronized (spellchecker) {
            spellchecker.setAccuracy(minScore);
            spellchecker.setStringDistance(spellCheckField.getStringDistance().getNewInstance());
            spellCheckItems = new ArrayList<SpellCheckItem>();
            for (String word : wordSet) {
                String[] suggestions = spellchecker.suggestSimilar(word, suggestionNumber);
                int s = 1;
                if (suggestions != null)
                    s += suggestions.length;
                SuggestionItem[] suggestionItems = new SuggestionItem[s];
                int i = 0;
                suggestionItems[i++] = new SuggestionItem(word);
                if (suggestions != null) {
                    for (String suggestion : suggestions)
                        suggestionItems[i++] = new SuggestionItem(suggestion);
                    spellCheckItems.add(new SpellCheckItem(word, suggestionItems));
                }
            }
        }
        List<String> highers = new ArrayList<String>(spellCheckItems.size());
        for (SpellCheckItem spellcheckItem : spellCheckItems) {
            spellcheckItem.computeFrequency(reader, fieldName);
            String higher = spellcheckItem.getHigher();
            if (higher != null)
                highers.add(higher);
        }
        suggestion = StringUtils.join(highers, ' ');
    }

    public String getFieldName() {
        return fieldName;
    }

    public List<SpellCheckItem> getList() {
        return spellCheckItems;
    }

    public String getSuggestion() {
        return suggestion;
    }

    @Override
    public Iterator<SpellCheckItem> iterator() {
        return spellCheckItems.iterator();
    }

}