/**
*
* 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.action;
import java.util.stream.Stream;
import com.speedment.common.mutablestream.HasNext;
import com.speedment.common.mutablestream.action.Action;
import com.speedment.common.mutablestream.action.LimitAction;
import java.util.stream.BaseStream;
import java.util.stream.DoubleStream;
import java.util.stream.IntStream;
import java.util.stream.LongStream;
import static java.util.Objects.requireNonNull;
/**
*
* @param <T> the filtered type
* @param <TS> the main stream interface
*
* @author Emil Forslund
* @since 1.0.0
*/
public final class LimitActionImpl<T, TS extends BaseStream<T, TS>>
extends AbstractAction<T, TS, T, TS>
implements LimitAction<T, TS> {
private final long limit;
public LimitActionImpl(HasNext<T, TS> previous, long limit) {
super(previous);
this.limit = requireNonNull(limit);
}
@Override
public long getLimit() {
return limit;
}
@Override
public <Q, QS extends BaseStream<Q, QS>> HasNext<Q, QS> append(Action<T, TS, Q, QS> next) {
return next;
}
@Override
@SuppressWarnings("unchecked")
public TS build(boolean parallel) {
final TS built = previous().build(parallel);
if (built instanceof Stream<?>) {
return (TS) ((Stream<T>) built).limit(limit);
} else if (built instanceof IntStream) {
return (TS) ((IntStream) built).limit(limit);
} else if (built instanceof LongStream) {
return (TS) ((LongStream) built).limit(limit);
} else if (built instanceof DoubleStream) {
return (TS) ((DoubleStream) built).limit(limit);
} else {
throw new UnsupportedOperationException(
"Built stream did not match any known stream interface."
);
}
}
}