package org.apache.lucene.queryParser.surround.query;
/**
* Copyright 2005 The Apache Software Foundation
*
* 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.
*/
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermEnum;
import org.apache.lucene.index.IndexReader;
import java.io.IOException;
public class SrndPrefixQuery extends SimpleTerm {
public SrndPrefixQuery(String prefix, boolean quoted, char truncator) {
super(quoted);
this.prefix = prefix;
this.truncator = truncator;
}
private final String prefix;
public String getPrefix() {return prefix;}
private final char truncator;
public char getSuffixOperator() {return truncator;}
public Term getLucenePrefixTerm(String fieldName) {
return new Term(fieldName, getPrefix());
}
public String toStringUnquoted() {return getPrefix();}
protected void suffixToString(StringBuffer r) {r.append(getSuffixOperator());}
public void visitMatchingTerms(
IndexReader reader,
String fieldName,
MatchingTermVisitor mtv) throws IOException
{
/* inspired by PrefixQuery.rewrite(): */
TermEnum enumerator = reader.terms(getLucenePrefixTerm(fieldName));
boolean expanded = false;
try {
do {
Term term = enumerator.term();
if ((term != null)
&& term.text().startsWith(getPrefix())
&& term.field().equals(fieldName)) {
mtv.visitMatchingTerm(term);
expanded = true;
} else {
break;
}
} while (enumerator.next());
} finally {
enumerator.close();
}
if (! expanded) {
System.out.println("No terms in " + fieldName + " field for: " + toString());
}
}
}
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