/*
* 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.project;
import com.facebook.presto.spi.Page;
import com.facebook.presto.spi.block.Block;
import com.google.common.primitives.Ints;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import static com.google.common.base.MoreObjects.toStringHelper;
public class InputChannels
{
private final int[] inputChannels;
public InputChannels(int... inputChannels)
{
this.inputChannels = inputChannels.clone();
}
public InputChannels(List<Integer> inputChannels)
{
this.inputChannels = inputChannels.stream().mapToInt(Integer::intValue).toArray();
}
public int size()
{
return inputChannels.length;
}
public List<Integer> getInputChannels()
{
return Collections.unmodifiableList(Ints.asList(inputChannels));
}
public Page getInputChannels(Page page)
{
Block[] blocks = new Block[inputChannels.length];
for (int i = 0; i < inputChannels.length; i++) {
blocks[i] = page.getBlock(inputChannels[i]);
}
return new Page(page.getPositionCount(), blocks);
}
@Override
public String toString()
{
return toStringHelper(this)
.addValue(Arrays.toString(inputChannels))
.toString();
}
}