/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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 com.aliyun.odps.lot.operators;
import java.util.List;
import com.aliyun.odps.lot.common.ArgumentNullException;
import com.aliyun.odps.lot.common.WindowFunction;
import apsara.odps.lot.Lot;
import apsara.odps.lot.WindowProtos;
public class Window extends Operator {
public static class Function {
private WindowFunction function;
private String alias;
public Function(WindowFunction function, String alias) {
if (function == null) {
throw new ArgumentNullException("function");
}
if (alias == null) {
throw new ArgumentNullException("alias");
}
this.function = function;
this.alias = alias;
}
public WindowFunction getFunction() {
return function;
}
public String getAlias() {
return alias;
}
public WindowProtos.Window.Functions toProtoBuf() {
WindowProtos.Window.Functions.Builder builder = WindowProtos.Window.Functions.newBuilder();
builder.setAlias(alias);
builder.setFunction(function.toProtoBuf());
return builder.build();
}
}
private List<Function> functions;
public List<Function> getFunctions() {
return functions;
}
public Window(List<Function> functions) {
if (functions == null) {
throw new ArgumentNullException("functions");
}
if (functions.size() == 0) {
throw new IllegalArgumentException(
"You have to specify one window function at least for Window operator.");
}
this.functions = functions;
}
@Override
public Lot.LogicalOperator toProtoBuf() {
assert (getParents().size() == 1);
Lot.LogicalOperator.Builder builder = Lot.LogicalOperator.newBuilder();
WindowProtos.Window.Builder w = WindowProtos.Window.newBuilder();
w.setId(getId());
w.setParentId(getParents().get(0).getId());
for (Function func : functions) {
w.addFunctions(func.toProtoBuf());
}
builder.setWindow(w.build());
return builder.build();
}
}