forked from apache/druid
/
NumberedPartitionChunk.java
126 lines (112 loc) · 3.27 KB
/
NumberedPartitionChunk.java
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/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.timeline.partition;
import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import com.google.common.collect.ComparisonChain;
public class NumberedPartitionChunk<T> implements PartitionChunk<T>
{
private final int chunkNumber;
private final int chunks;
private final T object;
public static <T> NumberedPartitionChunk<T> make(
int chunkNumber,
int chunks,
T obj
)
{
return new NumberedPartitionChunk<T>(chunkNumber, chunks, obj);
}
public NumberedPartitionChunk(
int chunkNumber,
int chunks,
T object
)
{
Preconditions.checkArgument(chunkNumber >= 0, "chunkNumber >= 0");
Preconditions.checkArgument(chunks >= 0, "chunks >= 0");
this.chunkNumber = chunkNumber;
this.chunks = chunks;
this.object = object;
}
@Override
public T getObject()
{
return object;
}
@Override
public boolean abuts(final PartitionChunk<T> other)
{
if (other instanceof NumberedPartitionChunk) {
NumberedPartitionChunk<T> castedOther = (NumberedPartitionChunk<T>) other;
if (castedOther.getChunkNumber() < castedOther.chunks) {
return other.getChunkNumber() == chunkNumber + 1;
} else {
return other.getChunkNumber() > chunkNumber;
}
} else {
return false;
}
}
@Override
public boolean isStart()
{
return chunks > 0 ? chunkNumber == 0 : true;
}
@Override
public boolean isEnd()
{
return chunks > 0 ? chunkNumber == chunks - 1 : true;
}
@Override
public int getChunkNumber()
{
return chunkNumber;
}
@Override
public int compareTo(PartitionChunk<T> other)
{
if (other instanceof NumberedPartitionChunk) {
final NumberedPartitionChunk castedOther = (NumberedPartitionChunk) other;
return ComparisonChain.start()
.compare(chunkNumber, castedOther.chunkNumber)
.compare(chunks, castedOther.chunks)
.result();
} else {
throw new IllegalArgumentException("Cannot compare against something that is not a NumberedPartitionChunk.");
}
}
@Override
@SuppressWarnings("unchecked")
public boolean equals(Object o)
{
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
return compareTo((NumberedPartitionChunk<T>) o) == 0;
}
@Override
public int hashCode()
{
return Objects.hashCode(chunks, chunkNumber);
}
}