diffcases.1139461.WildcardQuery.1139461_WildcardQuery_0_s Maven / Gradle / Ivy
package org.apache.lucene.search;
/**
* 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.
*/
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.util.ToStringUtils;
import java.io.IOException;
/** Implements the wildcard search query. Supported wildcards are *, which
* matches any character sequence (including the empty one), and ?,
* which matches any single character. Note this query can be slow, as it
* needs to iterate over many terms. In order to prevent extremely slow WildcardQueries,
* a Wildcard term should not start with one of the wildcards * or
* ?.
*
* This query uses the {@link
* MultiTermQuery#CONSTANT_SCORE_AUTO_REWRITE_DEFAULT}
* rewrite method.
*
* @see WildcardTermEnum */
public class WildcardQuery extends MultiTermQuery {
private boolean termContainsWildcard;
private boolean termIsPrefix;
protected Term term;
public WildcardQuery(Term term) {
this.term = term;
String text = term.text();
this.termContainsWildcard = (text.indexOf('*') != -1)
|| (text.indexOf('?') != -1);
this.termIsPrefix = termContainsWildcard
&& (text.indexOf('?') == -1)
&& (text.indexOf('*') == text.length() - 1);
}
@Override
protected FilteredTermEnum getEnum(IndexReader reader) throws IOException {
if (termContainsWildcard)
return new WildcardTermEnum(reader, getTerm());
else
return new SingleTermEnum(reader, getTerm());
}
/**
* Returns the pattern term.
*/
public Term getTerm() {
return term;
}
@Override
public Query rewrite(IndexReader reader) throws IOException {
if (termIsPrefix) {
MultiTermQuery rewritten = new PrefixQuery(term.createTerm(term.text()
.substring(0, term.text().indexOf('*'))));
rewritten.setBoost(getBoost());
rewritten.setRewriteMethod(getRewriteMethod());
return rewritten;
} else {
return super.rewrite(reader);
}
}
/** Prints a user-readable version of this query. */
@Override
public String toString(String field) {
StringBuilder buffer = new StringBuilder();
if (!term.field().equals(field)) {
buffer.append(term.field());
buffer.append(":");
}
buffer.append(term.text());
buffer.append(ToStringUtils.boost(getBoost()));
return buffer.toString();
}
@Override
public int hashCode() {
final int prime = 31;
int result = super.hashCode();
result = prime * result + ((term == null) ? 0 : term.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (!super.equals(obj))
return false;
if (getClass() != obj.getClass())
return false;
WildcardQuery other = (WildcardQuery) obj;
if (term == null) {
if (other.term != null)
return false;
} else if (!term.equals(other.term))
return false;
return true;
}
}