/* * 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.jackrabbit.core.query.lucene;import org.apache.lucene.index.Term;import org.apache.lucene.index.IndexReader;import org.apache.lucene.search.FilteredTermEnum;import java.io.IOException;/** * <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;    }}