org.apache.beam.runners.flink.translation.functions.FlinkAssignContext.java Source code

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Here is the source code for org.apache.beam.runners.flink.translation.functions.FlinkAssignContext.java

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/*
 * 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.runners.flink.translation.functions;

import static com.google.common.base.Preconditions.checkArgument;

import com.google.common.collect.Iterables;
import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
import org.apache.beam.sdk.transforms.windowing.WindowFn;
import org.apache.beam.sdk.util.WindowedValue;
import org.joda.time.Instant;

/**
 * {@link org.apache.beam.sdk.transforms.windowing.WindowFn.AssignContext} for
 * Flink functions.
 */
class FlinkAssignContext<InputT, W extends BoundedWindow> extends WindowFn<InputT, W>.AssignContext {
    private final WindowedValue<InputT> value;

    FlinkAssignContext(WindowFn<InputT, W> fn, WindowedValue<InputT> value) {
        fn.super();
        checkArgument(Iterables.size(value.getWindows()) == 1,
                String.format("%s passed to window assignment must be in a single window, but it was in %s: %s",
                        WindowedValue.class.getSimpleName(), Iterables.size(value.getWindows()),
                        value.getWindows()));
        this.value = value;
    }

    @Override
    public InputT element() {
        return value.getValue();
    }

    @Override
    public Instant timestamp() {
        return value.getTimestamp();
    }

    @Override
    public BoundedWindow window() {
        return Iterables.getOnlyElement(value.getWindows());
    }

}