/*
* 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 org.apache.beam.sdk.transforms.windowing;
import com.google.auto.value.AutoValue;
import java.util.Collection;
import java.util.Collections;
import org.apache.beam.sdk.coders.Coder;
import org.joda.time.Instant;
/**
* A {@link WindowFn} that assigns all data to the same window.
*
* <p>This is the {@link WindowFn} used for data coming from a source, before a
* {@link Window} transform has been applied.
*/
public class GlobalWindows extends NonMergingWindowFn<Object, GlobalWindow> {
private static final Collection<GlobalWindow> GLOBAL_WINDOWS =
Collections.singletonList(GlobalWindow.INSTANCE);
@Override
public Collection<GlobalWindow> assignWindows(AssignContext c) {
return GLOBAL_WINDOWS;
}
@Override
public boolean isCompatible(WindowFn<?, ?> o) {
return o instanceof GlobalWindows;
}
@Override
public void verifyCompatibility(WindowFn<?, ?> other) throws IncompatibleWindowException {
if (!this.isCompatible(other)) {
throw new IncompatibleWindowException(
other,
String.format(
"%s is only compatible with %s.",
GlobalWindows.class.getSimpleName(), GlobalWindows.class.getSimpleName()));
}
}
@Override
public Coder<GlobalWindow> windowCoder() {
return GlobalWindow.Coder.INSTANCE;
}
@Override
public WindowMappingFn<GlobalWindow> getDefaultWindowMappingFn() {
return new AutoValue_GlobalWindows_GlobalWindowMappingFn();
}
@AutoValue
abstract static class GlobalWindowMappingFn extends WindowMappingFn<GlobalWindow> {
@Override
public GlobalWindow getSideInputWindow(BoundedWindow mainWindow) {
return GlobalWindow.INSTANCE;
}
}
@Override
public Instant getOutputTime(Instant inputTimestamp, GlobalWindow window) {
return inputTimestamp;
}
@Override
public boolean equals(Object other) {
return other instanceof GlobalWindows;
}
@Override
public String toString() {
return getClass().getCanonicalName();
}
}