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Copy pathIxGenerateStateless.java
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66 lines (52 loc) · 1.7 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 IxGenerateStateless<T> extends Ix<T> {
final IxConsumer<IxEmitter<T>> generator;
IxGenerateStateless(IxConsumer<IxEmitter<T>> generator) {
this.generator = generator;
}
@Override
public Iterator<T> iterator() {
return new GenerateIterator<T>(generator);
}
static final class GenerateIterator<T> extends IxBaseIterator<T>
implements IxEmitter<T> {
final IxConsumer<IxEmitter<T>> generator;
GenerateIterator(IxConsumer<IxEmitter<T>> generator) {
this.generator = generator;
}
@Override
protected boolean moveNext() {
generator.accept(this);
boolean hv = hasValue;
if (!hv && !done) {
throw new IllegalStateException("The generator didn't call any of the onXXX methods!");
}
return hv;
}
@Override
public void onNext(T t) {
value = t;
hasValue = true;
}
@Override
public void onComplete() {
done = true;
}
}
}