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The source code

package org.apache.lucene.search;

/**
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed 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 java.util.BitSet;
import java.util.Date;
import java.io.IOException;

import org.apache.lucene.document.DateField;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermDocs;
import org.apache.lucene.index.TermEnum;
import org.apache.lucene.index.IndexReader;

/**
 * A Filter that restricts search results to a range of time.
 *
 * 

For this to work, documents must have been indexed with a * {@link DateField}. */ public class DateFilter extends Filter { String field; String start = DateField.MIN_DATE_STRING(); String end = DateField.MAX_DATE_STRING(); private DateFilter(String f) { field = f; } /** * Constructs a filter for field f matching dates * between from and to inclusively. */ public DateFilter(String f, Date from, Date to) { field = f; start = DateField.dateToString(from); end = DateField.dateToString(to); } /** * Constructs a filter for field f matching times * between from and to inclusively. */ public DateFilter(String f, long from, long to) { field = f; start = DateField.timeToString(from); end = DateField.timeToString(to); } /** * Constructs a filter for field f matching * dates on or before before date. */ public static DateFilter Before(String field, Date date) { DateFilter result = new DateFilter(field); result.end = DateField.dateToString(date); return result; } /** * Constructs a filter for field f matching times * on or before time. */ public static DateFilter Before(String field, long time) { DateFilter result = new DateFilter(field); result.end = DateField.timeToString(time); return result; } /** * Constructs a filter for field f matching * dates on or after date. */ public static DateFilter After(String field, Date date) { DateFilter result = new DateFilter(field); result.start = DateField.dateToString(date); return result; } /** * Constructs a filter for field f matching * times on or after time. */ public static DateFilter After(String field, long time) { DateFilter result = new DateFilter(field); result.start = DateField.timeToString(time); return result; } /** * Returns a BitSet with true for documents which should be * permitted in search results, and false for those that should * not. */ public BitSet bits(IndexReader reader) throws IOException { BitSet bits = new BitSet(reader.maxDoc()); TermEnum enumerator = reader.terms(new Term(field, start)); TermDocs termDocs = reader.termDocs(); if (enumerator.term() == null) { return bits; } try { Term stop = new Term(field, end); while (enumerator.term().compareTo(stop) <= 0) { termDocs.seek(enumerator.term()); while (termDocs.next()) { bits.set(termDocs.doc()); } if (!enumerator.next()) { break; } } } finally { enumerator.close(); termDocs.close(); } return bits; } public String toString() { StringBuffer buffer = new StringBuffer(); buffer.append(field); buffer.append(":"); buffer.append(DateField.stringToDate(start).toString()); buffer.append("-"); buffer.append(DateField.stringToDate(end).toString()); return buffer.toString(); } }

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