+++ /dev/null
-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 <code>*</code>, which
- * matches any character sequence (including the empty one), and <code>?</code>,
- * 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 <code>*</code> or
- * <code>?</code>.
- *
- * <p>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 (termIsPrefix) {
- return new PrefixTermEnum(reader, term.createTerm(term.text()
- .substring(0, term.text().indexOf('*'))));
- } else if (termContainsWildcard) {
- return new WildcardTermEnum(reader, getTerm());
- } else {
- return new SingleTermEnum(reader, getTerm());
- }
- }
-
- /**
- * Returns the pattern term.
- */
- public Term getTerm() {
- return term;
- }
-
- /** 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;
- }
-
-}