/**
* 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.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ConstantScoreQuery;
import java.io.IOException;
/**
* @version $Id: ConstantScorePrefixQuery.java 1065312 2011-01-30 16:08:25Z rmuir $
*/
public class ConstantScorePrefixQuery extends Query {
private final Term prefix;
public ConstantScorePrefixQuery(Term prefix) {
this.prefix = prefix;
}
/** Returns the prefix for this query */
public Term getPrefix() { return prefix; }
@Override
public Query rewrite(IndexReader reader) throws IOException {
// TODO: if number of terms are low enough, rewrite to a BooleanQuery
// for potentially faster execution.
// TODO: cache the bitset somewhere instead of regenerating it
Query q = new ConstantScoreQuery(new PrefixFilter(prefix));
q.setBoost(getBoost());
return q;
}
/** Prints a user-readable version of this query. */
@Override
public String toString(String field)
{
StringBuilder buffer = new StringBuilder();
if (!prefix.field().equals(field)) {
buffer.append(prefix.field());
buffer.append(":");
}
buffer.append(prefix.text());
buffer.append('*');
if (getBoost() != 1.0f) {
buffer.append("^");
buffer.append(Float.toString(getBoost()));
}
return buffer.toString();
}
/** Returns true if <code>o</code> is equal to this. */
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof ConstantScorePrefixQuery)) return false;
ConstantScorePrefixQuery other = (ConstantScorePrefixQuery) o;
return this.prefix.equals(other.prefix) && this.getBoost()==other.getBoost();
}
/** Returns a hash code value for this object.*/
@Override
public int hashCode() {
int h = prefix.hashCode() ^ Float.floatToIntBits(getBoost());
h ^= (h << 14) | (h >>> 19); // reversible (1 to 1) transformation unique to ConstantScorePrefixQuery
return h;
}
}