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/*******************************************************************************
* Copyright (c) 2000, 2007 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.help.internal.search;
import org.apache.lucene.index.*;
import org.apache.lucene.search.*;
/**
* Represents a token in user search query words
*/
public class QueryWordsToken {
public static final int AND = 0;
public static final int OR = 1;
public static final int NOT = 2;
public static final int EXACT_PHRASE = 3;
public static final int PHRASE = 4;
public static final int WORD = 5;
private static final QueryWordsToken fAND = new QueryWordsToken(AND, "AND"); //$NON-NLS-1$
private static final QueryWordsToken fOR = new QueryWordsToken(OR, "OR"); //$NON-NLS-1$
private static final QueryWordsToken fNOT = new QueryWordsToken(NOT, "NOT"); //$NON-NLS-1$
public int type;
public String value;
protected QueryWordsToken(int type, String value) {
this.type = type;
this.value = value;
}
/**
* Creates a lucene query for a field
*/
public Query createLuceneQuery(String field, float boost) {
Query q;
int questionPos = value.indexOf('?');
int starPos = value.indexOf('*');
if (questionPos >= 0 || starPos >= 0) {
if (questionPos == -1 && starPos == value.length() - 1) {
Term t = new Term("exact_" + field, value.substring(0, starPos)); //$NON-NLS-1$
q = new PrefixQuery(t);
((PrefixQuery) q).setBoost(boost);
} else {
Term t = new Term("exact_" + field, value); //$NON-NLS-1$
q = new WildcardQuery(t);
((WildcardQuery) q).setBoost(boost);
}
} else {
Term t = new Term(field, value);
q = new TermQuery(t);
((TermQuery) q).setBoost(boost);
}
// after updating Lucene, set boost on a Query class
return q;
}
public static QueryWordsToken AND() {
return fAND;
}
public static QueryWordsToken OR() {
return fOR;
}
public static QueryWordsToken NOT() {
return fNOT;
}
public static QueryWordsToken word(String word) {
return new QueryWordsToken(QueryWordsToken.WORD, word);
}
public static QueryWordsPhrase phrase() {
return new QueryWordsPhrase();
}
public static QueryWordsExactPhrase exactPhrase() {
return new QueryWordsExactPhrase();
}
public static QueryWordsExactPhrase exactPhrase(String word) {
QueryWordsExactPhrase token = new QueryWordsExactPhrase();
token.addWord(word);
return token;
}
}
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