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/**
* Copyright 2014 Netflix, Inc.
*
* 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 rx.internal.operators;
import rx.Observable;
import rx.Producer;
import rx.Subscriber;
/**
* Returns an Observable that skips the first num items emitted by the source
* Observable.
*
* 
*
* You can ignore the first num items emitted by an Observable and attend only to
* those items that come after, by modifying the Observable with the {@code skip} operator.
*/
public final class OperatorSkip implements Observable.Operator {
final int toSkip;
public OperatorSkip(int n) {
this.toSkip = n;
}
@Override
public Subscriber call(final Subscriber child) {
return new Subscriber(child) {
int skipped = 0;
@Override
public void onCompleted() {
child.onCompleted();
}
@Override
public void onError(Throwable e) {
child.onError(e);
}
@Override
public void onNext(T t) {
if (skipped >= toSkip) {
child.onNext(t);
} else {
skipped += 1;
}
}
@Override
public void setProducer(final Producer producer) {
child.setProducer(new Producer() {
@Override
public void request(long n) {
if (n == Long.MAX_VALUE) {
// infinite so leave it alone
producer.request(n);
} else if (n > 0) {
// add the skip num to the requested amount, since we'll skip everything and then emit to the buffer downstream
producer.request(n + (toSkip - skipped));
}
}
});
}
};
}
}