/**
*
* Copyright 2004 Hiram Chirino
*
* 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.
*
**/
package org.activeio.journal.active;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.activeio.Packet;
import org.activeio.PacketData;
import org.activeio.journal.RecordLocation;
/**
* Defines a where a record can be located in the Journal.
*
* @version $Revision: 1.1 $
*/
final public class Location implements RecordLocation {
static final public int SERIALIZED_SIZE=8;
final private int logFileId;
final private int logFileOffset;
public Location(int logFileId, int fileOffset) {
this.logFileId = logFileId;
this.logFileOffset = fileOffset;
}
public int compareTo(Object o) {
int rc = logFileId - ((Location) o).logFileId;
if (rc != 0)
return rc;
return logFileOffset - ((Location) o).logFileOffset;
}
public int hashCode() {
return logFileOffset ^ logFileId;
}
public boolean equals(Object o) {
if (o == null || o.getClass() != Location.class)
return false;
Location rl = (Location) o;
return rl.logFileId == this.logFileId && rl.logFileOffset == this.logFileOffset;
}
public String toString() {
return "" + logFileId + ":" + logFileOffset;
}
public int getLogFileId() {
return logFileId;
}
public int getLogFileOffset() {
return logFileOffset;
}
public void writeToPacket(Packet packet) throws IOException {
PacketData data = new PacketData(packet);
data.writeInt(logFileId);
data.writeInt(logFileOffset);
}
public void writeToDataOutput(DataOutput data) throws IOException {
data.writeInt(logFileId);
data.writeInt(logFileOffset);
}
static public Location readFromPacket(Packet packet) throws IOException {
PacketData data = new PacketData(packet);
return new Location(data.readInt(), data.readInt());
}
public static Location readFromDataInput(DataInput data) throws IOException {
return new Location(data.readInt(), data.readInt());
}
}