80 lines
2.3 KiB
Java
80 lines
2.3 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.cassandra.db.composites;
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import java.nio.ByteBuffer;
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import org.apache.cassandra.config.CFMetaData;
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import org.apache.cassandra.utils.memory.AbstractAllocator;
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import org.apache.cassandra.utils.ObjectSizes;
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/**
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* A "simple" (not-truly-composite) Composite.
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*/
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public class SimpleComposite extends AbstractComposite
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{
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private static final long EMPTY_SIZE = ObjectSizes.measure(new SimpleComposite(ByteBuffer.allocate(1)));
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protected final ByteBuffer element;
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SimpleComposite(ByteBuffer element)
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{
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// We have to be careful with empty ByteBuffers as we shouldn't store them.
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// To avoid errors (and so isEmpty() works as we intend), we don't allow simpleComposite with
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// an empty element (but it's ok for CompoundComposite, it's a row marker in that case).
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assert element.hasRemaining();
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this.element = element;
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}
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public int size()
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{
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return 1;
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}
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public ByteBuffer get(int i)
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{
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if (i != 0)
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throw new IndexOutOfBoundsException();
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return element;
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}
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@Override
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public Composite withEOC(EOC newEoc)
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{
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// EOC makes no sense for not truly composites.
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return this;
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}
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@Override
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public ByteBuffer toByteBuffer()
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{
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return element;
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}
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public long unsharedHeapSize()
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{
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return EMPTY_SIZE + ObjectSizes.sizeOnHeapOf(element);
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}
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public Composite copy(CFMetaData cfm, AbstractAllocator allocator)
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{
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return new SimpleComposite(allocator.clone(element));
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}
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}
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