/*
* 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;
import com.facebook.presto.operator.window.FrameInfo;
import com.facebook.presto.operator.window.WindowFunctionSupplier;
import com.facebook.presto.spi.function.WindowFunction;
import com.facebook.presto.spi.type.Type;
import com.google.common.collect.ImmutableList;
import java.util.Arrays;
import java.util.List;
import static java.util.Objects.requireNonNull;
public class WindowFunctionDefinition
{
private final WindowFunctionSupplier functionSupplier;
private final Type type;
private final FrameInfo frameInfo;
private final List<Integer> argumentChannels;
public static WindowFunctionDefinition window(WindowFunctionSupplier functionSupplier, Type type, FrameInfo frameInfo, List<Integer> inputs)
{
return new WindowFunctionDefinition(functionSupplier, type, frameInfo, inputs);
}
public static WindowFunctionDefinition window(WindowFunctionSupplier functionSupplier, Type type, FrameInfo frameInfo, Integer... inputs)
{
return window(functionSupplier, type, frameInfo, Arrays.asList(inputs));
}
WindowFunctionDefinition(WindowFunctionSupplier functionSupplier, Type type, FrameInfo frameInfo, List<Integer> argumentChannels)
{
requireNonNull(functionSupplier, "functionSupplier is null");
requireNonNull(type, "type is null");
requireNonNull(frameInfo, "frameInfo is null");
requireNonNull(argumentChannels, "inputs is null");
this.functionSupplier = functionSupplier;
this.type = type;
this.frameInfo = frameInfo;
this.argumentChannels = ImmutableList.copyOf(argumentChannels);
}
public FrameInfo getFrameInfo()
{
return frameInfo;
}
public Type getType()
{
return type;
}
public WindowFunction createWindowFunction()
{
return functionSupplier.createWindowFunction(argumentChannels);
}
}