/**
*
* 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 com.speedment.common.mutablestream.HasNext;
import com.speedment.common.mutablestream.action.Action;
import com.speedment.common.mutablestream.action.LimitAction;
import com.speedment.common.mutablestream.action.MapToLongAction;
import com.speedment.common.mutablestream.action.SkipAction;
import java.util.function.ToLongFunction;
import java.util.stream.BaseStream;
import java.util.stream.LongStream;
import java.util.stream.Stream;
import static java.util.Objects.requireNonNull;
/**
*
* @param <T> the ingoing type
*
* @author Emil Forslund
* @since 1.0.0
*/
public final class MapToLongActionImpl<T>
extends AbstractAction<T, Stream<T>, Long, LongStream>
implements MapToLongAction<T> {
private final ToLongFunction<T> mapper;
public MapToLongActionImpl(HasNext<T, Stream<T>> previous, ToLongFunction<T> mapper) {
super(previous);
this.mapper = requireNonNull(mapper);
}
@Override
public ToLongFunction<T> getMapper() {
return mapper;
}
@Override
public <Q, QS extends BaseStream<Q, QS>> HasNext<Q, QS> append(Action<Long, LongStream, Q, QS> next) {
// If the next builder is a LimitBuilder, flip our positions so that it
// is executed first.
return next.ifLimit().map(limit -> {
final LimitAction<T, Stream<T>> newLimit = LimitAction.create(previous(), limit.getLimit());
final HasNext<T, Stream<T>> newPrevious = previous().append(newLimit);
final MapToLongAction<T> newMap = MapToLongAction.create(newPrevious, mapper);
@SuppressWarnings("unchecked")
final HasNext<Q, QS> result = (HasNext<Q, QS>) newLimit.append(newMap);
return result;
// If the next builder is a SkipBuilder, flip our positions so that it
// is executed first.
}).orElseGet(() -> next.ifSkip().map(skip -> {
final SkipAction<T, Stream<T>> newSkip = SkipAction.create(previous(), skip.getSkip());
final HasNext<T, Stream<T>> newPrevious = previous().append(newSkip);
final MapToLongAction<T> newMap = MapToLongAction.create(newPrevious, mapper);
@SuppressWarnings("unchecked")
final HasNext<Q, QS> result = (HasNext<Q, QS>) newSkip.append(newMap);
return result;
// The next builder is not either skip or limit. Return it so that the
// order is preserved.
}).orElse(next));
}
@Override
public LongStream build(boolean parallel) {
return previous().build(parallel).mapToLong(mapper);
}
}