/*
* 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.cassandra.dht;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.Serializable;
import java.nio.ByteBuffer;
import org.apache.cassandra.io.ICompactSerializer2;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.utils.ByteBufferUtil;
public abstract class Token<T> implements Comparable<Token<T>>, Serializable
{
private static final long serialVersionUID = 1L;
private static final TokenSerializer serializer = new TokenSerializer();
public static TokenSerializer serializer()
{
return serializer;
}
public final T token;
protected Token(T token)
{
this.token = token;
}
/**
* This determines the comparison for node destination purposes.
*/
abstract public int compareTo(Token<T> o);
public String toString()
{
return token.toString();
}
public boolean equals(Object obj)
{
if (!(obj instanceof Token)) {
return false;
}
return token.equals(((Token)obj).token);
}
public int hashCode()
{
return token.hashCode();
}
public byte[] toBytes()
{
IPartitioner p = StorageService.getPartitioner();
return p.getTokenFactory().toByteArray(this).array();
}
public static abstract class TokenFactory<T>
{
public abstract ByteBuffer toByteArray(Token<T> token);
public abstract Token<T> fromByteArray(ByteBuffer bytes);
public abstract String toString(Token<T> token); // serialize as string, not necessarily human-readable
public abstract Token<T> fromString(String string); // deserialize
}
public static class TokenSerializer implements ICompactSerializer2<Token>
{
public void serialize(Token token, DataOutput dos) throws IOException
{
IPartitioner p = StorageService.getPartitioner();
ByteBuffer b = p.getTokenFactory().toByteArray(token);
ByteBufferUtil.writeWithLength(b, dos);
}
public Token deserialize(DataInput dis) throws IOException
{
IPartitioner p = StorageService.getPartitioner();
int size = dis.readInt();
byte[] bytes = new byte[size];
dis.readFully(bytes);
return p.getTokenFactory().fromByteArray(ByteBuffer.wrap(bytes));
}
}
}