/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.solr.search;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.WildcardTermEnum;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.TermEnum;
import org.apache.lucene.index.TermDocs;
import org.apache.lucene.util.OpenBitSet;
import java.io.IOException;
/**
*
* @version $Id: WildcardFilter.java 922957 2010-03-14 20:58:32Z markrmiller $
*/
public class WildcardFilter extends Filter {
protected final Term term;
public WildcardFilter(Term wildcardTerm) {
this.term = wildcardTerm;
}
public Term getTerm() { return term; }
@Override
public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
final OpenBitSet bitSet = new OpenBitSet(reader.maxDoc());
new WildcardGenerator(term) {
public void handleDoc(int doc) {
bitSet.set(doc);
}
}.generate(reader);
return bitSet;
}
@Override
public boolean equals(Object o) {
return o instanceof WildcardFilter && ((WildcardFilter)o).term.equals(this.term);
}
@Override
public int hashCode() {
return term.hashCode();
}
@Override
public String toString () {
StringBuilder sb = new StringBuilder();
sb.append("WildcardFilter(");
sb.append(term.toString());
sb.append(")");
return sb.toString();
}
}
abstract class WildcardGenerator implements IdGenerator {
protected final Term wildcard;
WildcardGenerator(Term wildcard) {
this.wildcard = wildcard;
}
public void generate(IndexReader reader) throws IOException {
TermEnum enumerator = new WildcardTermEnum(reader, wildcard);
TermDocs termDocs = reader.termDocs();
try {
do {
Term term = enumerator.term();
if (term==null) break;
termDocs.seek(term);
while (termDocs.next()) {
handleDoc(termDocs.doc());
}
} while (enumerator.next());
} finally {
termDocs.close();
enumerator.close();
}
}
}