/*
* 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.nio.ByteBuffer;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.apache.cassandra.db.BufferDecoratedKey;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.ObjectSizes;
public class LocalPartitioner extends AbstractPartitioner
{
private static final long EMPTY_SIZE = ObjectSizes.measure(new LocalToken(null, null));
private final AbstractType<?> comparator;
public LocalPartitioner(AbstractType<?> comparator)
{
this.comparator = comparator;
}
public DecoratedKey decorateKey(ByteBuffer key)
{
return new BufferDecoratedKey(getToken(key), key);
}
public Token midpoint(Token left, Token right)
{
throw new UnsupportedOperationException();
}
public LocalToken getMinimumToken()
{
return new LocalToken(comparator, ByteBufferUtil.EMPTY_BYTE_BUFFER);
}
public LocalToken getToken(ByteBuffer key)
{
return new LocalToken(comparator, key);
}
public long getHeapSizeOf(Token token)
{
return EMPTY_SIZE + ObjectSizes.sizeOnHeapOf(((LocalToken) token).token);
}
public LocalToken getRandomToken()
{
throw new UnsupportedOperationException();
}
public Token.TokenFactory getTokenFactory()
{
throw new UnsupportedOperationException();
}
public boolean preservesOrder()
{
return true;
}
public Map<Token, Float> describeOwnership(List<Token> sortedTokens)
{
return Collections.singletonMap((Token)getMinimumToken(), new Float(1.0));
}
public AbstractType<?> getTokenValidator()
{
return comparator;
}
}