/*
* 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.exoplatform.services.jcr.impl.core.query.lucene;
import java.io.IOException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.FilteredTermEnum;
/**
* <code>RangeScan</code> implements a range scan on terms.
*/
class RangeScan extends FilteredTermEnum {
private final Term upper;
private boolean endEnum = false;
/**
* Scans the index beginning at <code>lower</code> Term to <code>upper</code>.
* @param reader the index reader;
* @param lower the lower limit.
* @param upper the upper limit.
*/
RangeScan(IndexReader reader, Term lower, Term upper) throws IOException {
this.upper = upper;
setEnum(reader.terms(lower));
}
protected boolean termCompare(Term term) {
int compare = term.compareTo(upper);
if (compare > 0) {
endEnum = true;
}
return compare <= 0;
}
public float difference() {
return 1.0f;
}
protected boolean endEnum() {
return endEnum;
}
}