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Zip.java
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56 lines (48 loc) · 1.75 KB
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/*
* Copyright (c) 2020, Fernando Miguel Carvalho, mcarvalho@cc.isel.ipl.pt
*
* 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 org.jayield.ops;
import org.jayield.Advancer;
import org.jayield.Query;
import org.jayield.Traverser;
import org.jayield.Yield;
import org.jayield.boxes.BoolBox;
import java.util.function.BiFunction;
public class Zip<T, U, R> implements Advancer<R>, Traverser<R> {
private final Query<T> upstream;
private final Query<U> other;
private final BiFunction<? super T, ? super U, ? extends R> zipper;
public Zip(Query<T> upstream, Query<U> other, BiFunction<? super T, ? super U, ? extends R> zipper) {
this.upstream = upstream;
this.other = other;
this.zipper = zipper;
}
@Override
public boolean tryAdvance(Yield<? super R> yield) {
BoolBox consumed = new BoolBox();
upstream.tryAdvance(e1 -> other.tryAdvance(e2 -> {
yield.ret(zipper.apply(e1, e2));
consumed.set();
}));
return consumed.isTrue();
}
@Override
public void traverse(Yield<? super R> yield) {
upstream.shortCircuit(e1 -> {
if(!other.tryAdvance(e2 -> yield.ret(zipper.apply(e1, e2))))
Yield.bye();
});
}
}