com.facebook.presto.block.rle.RunLengthEncodedBlock.java Source code

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Here is the source code for com.facebook.presto.block.rle.RunLengthEncodedBlock.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.block.rle;

import com.facebook.presto.block.Block;
import com.facebook.presto.serde.RunLengthBlockEncoding;
import com.facebook.presto.tuple.Tuple;
import com.facebook.presto.tuple.TupleInfo;
import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import io.airlift.units.DataSize;
import io.airlift.units.DataSize.Unit;

public class RunLengthEncodedBlock implements Block {
    private final Tuple value;
    private final int positionCount;

    public RunLengthEncodedBlock(Tuple value, int positionCount) {
        this.value = value;
        this.positionCount = positionCount;
    }

    public Tuple getValue() {
        return value;
    }

    public Tuple getSingleValue() {
        return value;
    }

    @Override
    public int getPositionCount() {
        return positionCount;
    }

    @Override
    public DataSize getDataSize() {
        return new DataSize(value.getTupleSlice().length(), Unit.BYTE);
    }

    @Override
    public RunLengthBlockEncoding getEncoding() {
        return new RunLengthBlockEncoding(value.getTupleInfo());
    }

    @Override
    public Block getRegion(int positionOffset, int length) {
        Preconditions.checkPositionIndexes(positionOffset, positionOffset + length, positionCount);
        return new RunLengthEncodedBlock(value, length);
    }

    @Override
    public TupleInfo getTupleInfo() {
        return value.getTupleInfo();
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(this).add("value", value).add("positionCount", positionCount).toString();
    }

    @Override
    public RunLengthEncodedBlockCursor cursor() {
        return new RunLengthEncodedBlockCursor(value, positionCount);
    }
}