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83 lines (65 loc) · 2.34 KB
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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 IxGenerate<T, S> extends Ix<T> {
final IxSupplier<S> stateFactory;
final IxFunction2<S, IxEmitter<T>, S> generator;
final IxConsumer<? super S> stateDisposer;
IxGenerate(IxSupplier<S> stateFactory, IxFunction2<S, IxEmitter<T>, S> generator, IxConsumer<? super S> stateDisposer) {
this.stateFactory = stateFactory;
this.generator = generator;
this.stateDisposer = stateDisposer;
}
@Override
public Iterator<T> iterator() {
return new GenerateIterator<T, S>(stateFactory.get(), generator, stateDisposer);
}
static final class GenerateIterator<T, S> extends IxBaseIterator<T>
implements IxEmitter<T> {
final IxFunction2<S, IxEmitter<T>, S> generator;
final IxConsumer<? super S> stateDisposer;
S state;
GenerateIterator(S state, IxFunction2<S, IxEmitter<T>, S> generator, IxConsumer<? super S> stateDisposer) {
this.state = state;
this.generator = generator;
this.stateDisposer = stateDisposer;
}
@Override
protected boolean moveNext() {
state = generator.apply(state, this);
boolean hv = hasValue;
boolean d = done;
if (!hv && !d) {
stateDisposer.accept(state);
throw new IllegalStateException("The generator didn't call any of the onXXX methods!");
}
if (d) {
stateDisposer.accept(state);
}
return hv;
}
@Override
public void onNext(T t) {
value = t;
hasValue = true;
}
@Override
public void onComplete() {
done = true;
}
}
}