| /* |
| * 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.DecoratedKey; |
| import org.apache.cassandra.db.CachedHashDecoratedKey; |
| import org.apache.cassandra.db.marshal.AbstractType; |
| import org.apache.cassandra.utils.ByteBufferUtil; |
| import org.apache.cassandra.utils.ObjectSizes; |
| import org.apache.cassandra.utils.memory.HeapAllocator; |
| |
| public class LocalPartitioner implements IPartitioner |
| { |
| private static final long EMPTY_SIZE = ObjectSizes.measure(new LocalPartitioner(null).new LocalToken()); |
| |
| final AbstractType<?> comparator; // package-private to avoid access workarounds in embedded LocalToken. |
| |
| public LocalPartitioner(AbstractType<?> comparator) |
| { |
| this.comparator = comparator; |
| } |
| |
| public DecoratedKey decorateKey(ByteBuffer key) |
| { |
| return new CachedHashDecoratedKey(getToken(key), key); |
| } |
| |
| public Token midpoint(Token left, Token right) |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public LocalToken getMinimumToken() |
| { |
| return new LocalToken(ByteBufferUtil.EMPTY_BYTE_BUFFER); |
| } |
| |
| public LocalToken getToken(ByteBuffer key) |
| { |
| return new LocalToken(key); |
| } |
| |
| public LocalToken getRandomToken() |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public Token.TokenFactory getTokenFactory() |
| { |
| return tokenFactory; |
| } |
| |
| private final Token.TokenFactory tokenFactory = new Token.TokenFactory() |
| { |
| public ByteBuffer toByteArray(Token token) |
| { |
| return ((LocalToken)token).token; |
| } |
| |
| public Token fromByteArray(ByteBuffer bytes) |
| { |
| return new LocalToken(bytes); |
| } |
| |
| public String toString(Token token) |
| { |
| return comparator.getString(((LocalToken)token).token); |
| } |
| |
| public void validate(String token) |
| { |
| comparator.validate(comparator.fromString(token)); |
| } |
| |
| public Token fromString(String string) |
| { |
| return new LocalToken(comparator.fromString(string)); |
| } |
| }; |
| |
| 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; |
| } |
| |
| public AbstractType<?> partitionOrdering() |
| { |
| return comparator; |
| } |
| |
| public class LocalToken extends ComparableObjectToken<ByteBuffer> |
| { |
| static final long serialVersionUID = 8437543776403014875L; |
| |
| private LocalToken() |
| { |
| super(null); |
| } |
| |
| public LocalToken(ByteBuffer token) |
| { |
| super(HeapAllocator.instance.clone(token)); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return comparator.getString(token); |
| } |
| |
| @Override |
| public int compareTo(Token o) |
| { |
| assert getPartitioner() == o.getPartitioner(); |
| return comparator.compare(token, ((LocalToken) o).token); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| final int prime = 31; |
| return prime + token.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) |
| { |
| if (this == obj) |
| return true; |
| if (!(obj instanceof LocalToken)) |
| return false; |
| LocalToken other = (LocalToken) obj; |
| return token.equals(other.token); |
| } |
| |
| @Override |
| public IPartitioner getPartitioner() |
| { |
| return LocalPartitioner.this; |
| } |
| |
| @Override |
| public long getHeapSize() |
| { |
| return EMPTY_SIZE + ObjectSizes.sizeOnHeapOf(token); |
| } |
| } |
| } |