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/*
* Copyright 2011-2016 David Karnok
*
* 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 ix;
import java.util.Iterator;
final class IxForloop<T, R> extends Ix<R> {
final T seed;
final IxPredicate<? super T> condition;
final IxFunction<? super T, ? extends R> selector;
final IxFunction<? super T, ? extends T> next;
IxForloop(T seed, IxPredicate<? super T> condition, IxFunction<? super T, ? extends R> selector,
IxFunction<? super T, ? extends T> next) {
this.seed = seed;
this.condition = condition;
this.selector = selector;
this.next = next;
}
@Override
public Iterator<R> iterator() {
return new ForloopIterator<T, R>(seed, condition, selector, next);
}
static final class ForloopIterator<T, R> extends IxBaseIterator<R> {
T index;
final IxPredicate<? super T> condition;
final IxFunction<? super T, ? extends R> selector;
final IxFunction<? super T, ? extends T> next;
boolean exceptFirst;
ForloopIterator(T index, IxPredicate<? super T> condition, IxFunction<? super T, ? extends R> selector,
IxFunction<? super T, ? extends T> next) {
this.index = index;
this.condition = condition;
this.selector = selector;
this.next = next;
}
@Override
protected boolean moveNext() {
T i = index;
if (exceptFirst) {
i = next.apply(i);
index = i;
} else {
exceptFirst = true;
}
if (!condition.test(i)) {
done = true;
return false;
}
value = selector.apply(i);
hasValue = true;
return true;
}
}
}