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AsyncQuerySkip.java
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46 lines (40 loc) · 1.44 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.async;
import org.jayield.AsyncQuery;
import org.jayield.AsyncTraverser;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
public class AsyncQuerySkip<T> extends AsyncQuery<T> {
private final AsyncTraverser<T> upstream;
private final int skip;
private int count = 0;
public AsyncQuerySkip(AsyncTraverser<T> upstream, int skip) {
this.upstream = upstream;
this.skip = skip;
}
@Override
public CompletableFuture<Void> subscribe(BiConsumer<? super T, ? super Throwable> cons) {
return upstream.subscribe((item, err) -> {
if(err != null) {
cons.accept(null, err);
return;
}
if(count >= skip) cons.accept(item, err);
else count++;
});
}
}