/**
*
* 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.MapIntToDoubleAction;
import com.speedment.common.mutablestream.action.SkipAction;
import java.util.stream.BaseStream;
import java.util.stream.IntStream;
import static java.util.Objects.requireNonNull;
import java.util.function.IntToDoubleFunction;
import java.util.stream.DoubleStream;
/**
*
* @author Emil Forslund
* @since 1.0.0
*/
public final class MapIntToDoubleActionImpl
extends AbstractAction<Integer, IntStream, Double, DoubleStream>
implements MapIntToDoubleAction {
private final IntToDoubleFunction mapper;
public MapIntToDoubleActionImpl(HasNext<Integer, IntStream> previous, IntToDoubleFunction mapper) {
super(previous);
this.mapper = requireNonNull(mapper);
}
@Override
public IntToDoubleFunction getMapper() {
return mapper;
}
@Override
public <Q, QS extends BaseStream<Q, QS>> HasNext<Q, QS> append(Action<Double, DoubleStream, 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<Integer, IntStream> newLimit = LimitAction.create(previous(), limit.getLimit());
final HasNext<Integer, IntStream> newPrevious = previous().append(newLimit);
final MapIntToDoubleAction newMap = MapIntToDoubleAction.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<Integer, IntStream> newSkip = SkipAction.create(previous(), skip.getSkip());
final HasNext<Integer, IntStream> newPrevious = previous().append(newSkip);
final MapIntToDoubleAction newMap = MapIntToDoubleAction.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 DoubleStream build(boolean parallel) {
return previous().build(parallel).mapToDouble(mapper);
}
}