| /* |
| * 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.db.composites; |
| |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| |
| import org.apache.cassandra.config.CFMetaData; |
| import org.apache.cassandra.db.filter.ColumnSlice; |
| import org.apache.cassandra.utils.ByteBufferUtil; |
| import org.apache.cassandra.utils.memory.AbstractAllocator; |
| |
| import com.google.common.base.Function; |
| import com.google.common.collect.Lists; |
| |
| public abstract class Composites |
| { |
| private Composites() {} |
| |
| public static final Composite EMPTY = new EmptyComposite(); |
| |
| /** |
| * Converts the specified <code>Composites</code> into <code>ByteBuffer</code>s. |
| * |
| * @param composites the composites to convert. |
| * @return the <code>ByteBuffer</code>s corresponding to the specified <code>Composites</code>. |
| */ |
| public static List<ByteBuffer> toByteBuffers(List<Composite> composites) |
| { |
| return Lists.transform(composites, new Function<Composite, ByteBuffer>() |
| { |
| public ByteBuffer apply(Composite composite) |
| { |
| return composite.toByteBuffer(); |
| } |
| }); |
| } |
| |
| static final CBuilder EMPTY_BUILDER = new CBuilder() |
| { |
| public int remainingCount() { return 0; } |
| |
| public CBuilder add(ByteBuffer value) { throw new IllegalStateException(); } |
| public CBuilder add(Object value) { throw new IllegalStateException(); } |
| |
| public Composite build() { return EMPTY; } |
| public Composite buildWith(ByteBuffer value) { throw new IllegalStateException(); } |
| public Composite buildWith(List<ByteBuffer> values) { throw new IllegalStateException(); } |
| }; |
| |
| private static class EmptyComposite implements Composite |
| { |
| public boolean isEmpty() |
| { |
| return true; |
| } |
| |
| public int size() |
| { |
| return 0; |
| } |
| |
| public ByteBuffer get(int i) |
| { |
| if (i > 0) |
| throw new IndexOutOfBoundsException(); |
| |
| return ByteBufferUtil.EMPTY_BYTE_BUFFER; |
| } |
| |
| public EOC eoc() |
| { |
| return EOC.NONE; |
| } |
| |
| public Composite start() |
| { |
| // Note that SimpleCType/AbstractSimpleCellNameType compare method |
| // indirectly rely on the fact that EMPTY == EMPTY.start() == EMPTY.end() |
| // (or more precisely on the fact that the EOC is NONE for all of those). |
| return this; |
| } |
| |
| public Composite end() |
| { |
| // Note that SimpleCType/AbstractSimpleCellNameType compare method |
| // indirectly rely on the fact that EMPTY == EMPTY.start() == EMPTY.end() |
| // (or more precisely on the fact that the EOC is NONE for all of those). |
| return this; |
| } |
| |
| public Composite withEOC(EOC newEoc) |
| { |
| // Note that SimpleCType/AbstractSimpleCellNameType compare method |
| // indirectly rely on the fact that EMPTY == EMPTY.start() == EMPTY.end() |
| // (or more precisely on the fact that the EOC is NONE for all of those). |
| return this; |
| } |
| |
| public ColumnSlice slice() |
| { |
| return ColumnSlice.ALL_COLUMNS; |
| } |
| |
| public ByteBuffer toByteBuffer() |
| { |
| return ByteBufferUtil.EMPTY_BYTE_BUFFER; |
| } |
| |
| public boolean isStatic() |
| { |
| return false; |
| } |
| |
| public int dataSize() |
| { |
| return 0; |
| } |
| |
| public long unsharedHeapSize() |
| { |
| return 0; |
| } |
| |
| public boolean isPrefixOf(CType type, Composite c) |
| { |
| return true; |
| } |
| |
| public Composite copy(CFMetaData cfm, AbstractAllocator allocator) |
| { |
| return this; |
| } |
| } |
| } |