| /** |
| * 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.kahadb.journal; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.util.concurrent.CountDownLatch; |
| |
| /** |
| * Used as a location in the data store. |
| * |
| * |
| */ |
| public final class Location implements Comparable<Location> { |
| |
| public static final byte USER_TYPE = 1; |
| public static final byte NOT_SET_TYPE = 0; |
| public static final int NOT_SET = -1; |
| |
| private int dataFileId = NOT_SET; |
| private int offset = NOT_SET; |
| private int size = NOT_SET; |
| private byte type = NOT_SET_TYPE; |
| private CountDownLatch latch; |
| |
| public Location() { |
| } |
| |
| public Location(Location item) { |
| this.dataFileId = item.dataFileId; |
| this.offset = item.offset; |
| this.size = item.size; |
| this.type = item.type; |
| } |
| |
| public Location(int dataFileId, int offset) { |
| this.dataFileId=dataFileId; |
| this.offset=offset; |
| } |
| |
| boolean isValid() { |
| return dataFileId != NOT_SET; |
| } |
| |
| /** |
| * @return the size of the data record including the header. |
| */ |
| public int getSize() { |
| return size; |
| } |
| |
| /** |
| * @param size the size of the data record including the header. |
| */ |
| public void setSize(int size) { |
| this.size = size; |
| } |
| |
| public int getOffset() { |
| return offset; |
| } |
| |
| public void setOffset(int offset) { |
| this.offset = offset; |
| } |
| |
| public int getDataFileId() { |
| return dataFileId; |
| } |
| |
| public void setDataFileId(int file) { |
| this.dataFileId = file; |
| } |
| |
| public byte getType() { |
| return type; |
| } |
| |
| public void setType(byte type) { |
| this.type = type; |
| } |
| |
| public String toString() { |
| return dataFileId+":"+offset; |
| } |
| |
| public void writeExternal(DataOutput dos) throws IOException { |
| dos.writeInt(dataFileId); |
| dos.writeInt(offset); |
| dos.writeInt(size); |
| dos.writeByte(type); |
| } |
| |
| public void readExternal(DataInput dis) throws IOException { |
| dataFileId = dis.readInt(); |
| offset = dis.readInt(); |
| size = dis.readInt(); |
| type = dis.readByte(); |
| } |
| |
| public CountDownLatch getLatch() { |
| return latch; |
| } |
| |
| public void setLatch(CountDownLatch latch) { |
| this.latch = latch; |
| } |
| |
| public int compareTo(Location o) { |
| Location l = (Location)o; |
| if (dataFileId == l.dataFileId) { |
| int rc = offset - l.offset; |
| return rc; |
| } |
| return dataFileId - l.dataFileId; |
| } |
| |
| public boolean equals(Object o) { |
| boolean result = false; |
| if (o instanceof Location) { |
| result = compareTo((Location)o) == 0; |
| } |
| return result; |
| } |
| |
| public int hashCode() { |
| return dataFileId ^ offset; |
| } |
| |
| } |