001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.kahadb.journal;
018
019import java.io.File;
020import java.io.IOException;
021import java.io.RandomAccessFile;
022
023import org.apache.kahadb.util.IOHelper;
024import org.apache.kahadb.util.LinkedNode;
025import org.apache.kahadb.util.SequenceSet;
026
027/**
028 * DataFile
029 * 
030 * 
031 */
032public class DataFile extends LinkedNode<DataFile> implements Comparable<DataFile> {
033
034    protected final File file;
035    protected final Integer dataFileId;
036    protected int length;
037    protected final SequenceSet corruptedBlocks = new SequenceSet();
038
039    DataFile(File file, int number, int preferedSize) {
040        this.file = file;
041        this.dataFileId = Integer.valueOf(number);
042        length = (int)(file.exists() ? file.length() : 0);
043    }
044    
045    public File getFile() {
046        return file;
047    }
048
049    public Integer getDataFileId() {
050        return dataFileId;
051    }
052
053    public synchronized int getLength() {
054        return length;
055    }
056
057    public void setLength(int length) {
058        this.length = length;
059    }
060
061    public synchronized void incrementLength(int size) {
062        length += size;
063    }
064
065    public synchronized String toString() {
066        return file.getName() + " number = " + dataFileId + " , length = " + length;
067    }
068
069    public synchronized RandomAccessFile openRandomAccessFile() throws IOException {
070        return new RandomAccessFile(file, "rw");
071    }
072
073    public synchronized void closeRandomAccessFile(RandomAccessFile file) throws IOException {
074        file.close();
075    }
076
077    public synchronized boolean delete() throws IOException {
078        return file.delete();
079    }
080    
081    public synchronized void move(File targetDirectory) throws IOException{
082        IOHelper.moveFile(file,targetDirectory);
083    }
084
085    public SequenceSet getCorruptedBlocks() {
086        return corruptedBlocks;
087    }
088    
089    public int compareTo(DataFile df) {
090        return dataFileId - df.dataFileId;
091    }
092
093    @Override
094    public boolean equals(Object o) {
095        boolean result = false;
096        if (o instanceof DataFile) {
097            result = compareTo((DataFile)o) == 0;
098        }
099        return result;
100    }
101
102    @Override
103    public int hashCode() {
104        return dataFileId;
105    }
106}