| package org.apache.lucene.index; |
| |
| /* ==================================================================== |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Apache" and "Apache Software Foundation" and |
| * "Apache Lucene" must not be used to endorse or promote products |
| * derived from this software without prior written permission. For |
| * written permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * "Apache Lucene", nor may "Apache" appear in their name, without |
| * prior written permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| import java.util.Vector; |
| import java.io.IOException; |
| import org.apache.lucene.store.Directory; |
| import org.apache.lucene.store.InputStream; |
| import org.apache.lucene.store.OutputStream; |
| |
| final class SegmentInfos extends Vector { |
| public int counter = 0; // used to name new segments |
| |
| public final SegmentInfo info(int i) { |
| return (SegmentInfo)elementAt(i); |
| } |
| |
| public final void read(Directory directory) throws IOException { |
| InputStream input = directory.openFile("segments"); |
| try { |
| counter = input.readInt(); // read counter |
| for (int i = input.readInt(); i > 0; i--) { // read segmentInfos |
| SegmentInfo si = new SegmentInfo(input.readString(), input.readInt(), |
| directory); |
| addElement(si); |
| } |
| } finally { |
| input.close(); |
| } |
| } |
| |
| public final void write(Directory directory) throws IOException { |
| OutputStream output = directory.createFile("segments.new"); |
| try { |
| output.writeInt(counter); // write counter |
| output.writeInt(size()); // write infos |
| for (int i = 0; i < size(); i++) { |
| SegmentInfo si = info(i); |
| output.writeString(si.name); |
| output.writeInt(si.docCount); |
| } |
| } finally { |
| output.close(); |
| } |
| |
| // install new segment info |
| directory.renameFile("segments.new", "segments"); |
| } |
| } |