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DropWhile.java
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53 lines (45 loc) · 1.35 KB
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package org.jayield.ops;
import org.jayield.Advancer;
import org.jayield.Query;
import org.jayield.Traverser;
import org.jayield.Yield;
import java.util.function.Predicate;
public class DropWhile<T> implements Advancer<T>, Traverser<T> {
private final Query<T> upstream;
private final Predicate<T> predicate;
private boolean dropped;
public DropWhile(Query<T> upstream, Predicate<T> predicate) {
this.upstream = upstream;
this.predicate = predicate;
}
@Override
public void traverse(Yield<? super T> yield) {
upstream.traverse(item -> {
if (!dropped && !predicate.test(item)) {
dropped = true;
}
if (dropped) {
yield.ret(item);
}
});
}
@Override
public boolean tryAdvance(Yield<? super T> yield) {
if (dropped) {
return upstream.tryAdvance(yield);
} else {
while(!dropped && dropNext(yield)) {
// Intentionally empty. Action specified on yield statement of tryAdvance().
}
return dropped;
}
}
private boolean dropNext(Yield<? super T> yield) {
return upstream.tryAdvance(item -> {
if(!predicate.test(item)){
dropped = true;
yield.ret(item);
}
});
}
}