/**
*
* Copyright (c) 2006-2017, Speedment, 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.speedment.common.mutablestream.internal.terminate;
import java.util.stream.Stream;
import com.speedment.common.mutablestream.HasNext;
import com.speedment.common.mutablestream.terminate.CountTerminator;
import java.util.stream.BaseStream;
import java.util.stream.DoubleStream;
import java.util.stream.IntStream;
import java.util.stream.LongStream;
/**
*
* @param <T> the terminated stream type
* @param <TS> the main stream interface
*
* @author Emil Forslund
* @since 1.0.0
*/
public final class CountTerminatorImpl<T, TS extends BaseStream<T, TS>>
extends AbstractTerminator<T, TS, Long>
implements CountTerminator<T, TS> {
public CountTerminatorImpl(HasNext<T, TS> previous, boolean parallel) {
super(previous, parallel);
}
@Override
@SuppressWarnings("unchecked")
public Long execute() {
try (final TS built = buildPrevious()) {
if (built instanceof Stream<?>) {
return ((Stream<T>) built).count();
} else if (built instanceof IntStream) {
return ((IntStream) built).count();
} else if (built instanceof LongStream) {
return ((LongStream) built).count();
} else if (built instanceof DoubleStream) {
return ((DoubleStream) built).count();
} else {
throw new UnsupportedOperationException(
"Built stream did not match any known stream interface."
);
}
}
}
}