com.hazelcast.jet.stream.impl.processor.CollectorCombineP Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2018, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.jet.stream.impl.processor;
import com.hazelcast.jet.core.AbstractProcessor;
import javax.annotation.Nonnull;
import java.util.function.BiConsumer;
public class CollectorCombineP extends AbstractProcessor {
private final BiConsumer combiner;
private T result;
public CollectorCombineP(BiConsumer combiner) {
this.combiner = combiner;
}
@Override
protected boolean tryProcess(int ordinal, @Nonnull Object item) throws Exception {
if (result != null) {
combiner.accept(result, (T) item);
} else {
result = (T) item;
}
return true;
}
@Override
public boolean complete() {
return result == null || tryEmit(result);
}
}