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Skip.java
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54 lines (48 loc) · 1.51 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;
public class Skip<T> implements Advancer<T>, Traverser<T> {
private final Query<T> upstream;
private final int n;
int index;
public Skip(Query<T> adv, int n) {
this.upstream = adv;
this.n = n;
index = 0;
}
/**
* Continues from the point where tryAdvance or next left the
* internal iteration.
* @param yield
*/
@Override
public void traverse(Yield<? super T> yield) {
upstream.traverse(item -> {
if(index++ >= n)
yield.ret(item);
});
}
@Override
public boolean tryAdvance(Yield<? super T> yield) {
for (; index < n; index++)
upstream.tryAdvance(item -> {});
return upstream.tryAdvance(yield);
}
}