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Convert WindowIndex into an interface
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presto-main/src/main/java/com/facebook/presto/operator/window/PagesWindowIndex.java
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/* | |||
* Licensed 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 com.facebook.presto.operator.window; | |||
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import com.facebook.presto.operator.PagesIndex; | |||
import com.facebook.presto.spi.block.BlockBuilder; | |||
import io.airlift.slice.Slice; | |||
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import static com.google.common.base.MoreObjects.toStringHelper; | |||
import static com.google.common.base.Preconditions.checkArgument; | |||
import static com.google.common.base.Preconditions.checkElementIndex; | |||
import static com.google.common.base.Preconditions.checkPositionIndex; | |||
import static java.util.Objects.requireNonNull; | |||
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public class PagesWindowIndex | |||
implements WindowIndex | |||
{ | |||
private final PagesIndex pagesIndex; | |||
private final int start; | |||
private final int size; | |||
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public PagesWindowIndex(PagesIndex pagesIndex, int start, int end) | |||
{ | |||
requireNonNull(pagesIndex, "pagesIndex is null"); | |||
checkPositionIndex(start, pagesIndex.getPositionCount(), "start"); | |||
checkPositionIndex(end, pagesIndex.getPositionCount(), "end"); | |||
checkArgument(start < end, "start must be before end"); | |||
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this.pagesIndex = pagesIndex; | |||
this.start = start; | |||
this.size = end - start; | |||
} | |||
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@Override | |||
public int size() | |||
{ | |||
return size; | |||
} | |||
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@Override | |||
public boolean isNull(int channel, int position) | |||
{ | |||
return pagesIndex.isNull(channel, position(position)); | |||
} | |||
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@Override | |||
public boolean getBoolean(int channel, int position) | |||
{ | |||
return pagesIndex.getBoolean(channel, position(position)); | |||
} | |||
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@Override | |||
public long getLong(int channel, int position) | |||
{ | |||
return pagesIndex.getLong(channel, position(position)); | |||
} | |||
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@Override | |||
public double getDouble(int channel, int position) | |||
{ | |||
return pagesIndex.getDouble(channel, position(position)); | |||
} | |||
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@Override | |||
public Slice getSlice(int channel, int position) | |||
{ | |||
return pagesIndex.getSlice(channel, position(position)); | |||
} | |||
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@Override | |||
public void appendTo(int channel, int position, BlockBuilder output) | |||
{ | |||
pagesIndex.appendTo(channel, position(position), output); | |||
} | |||
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private int position(int position) | |||
{ | |||
checkElementIndex(position, size, "position"); | |||
return position + start; | |||
} | |||
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@Override | |||
public String toString() | |||
{ | |||
return toStringHelper(this) | |||
.add("size", size) | |||
.toString(); | |||
} | |||
} |
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