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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.Operator;
import rx.Subscriber;
import rx.exceptions.Exceptions;
import rx.functions.*;

/**O
 * Returns an Observable that emits items emitted by the source Observable as long as a specified
 * condition is true.
 * 

* * @param the value type */ public final class OperatorTakeWhile implements Operator { final Func2 predicate; public OperatorTakeWhile(final Func1 underlying) { this(new Func2() { @Override public Boolean call(T input, Integer index) { return underlying.call(input); } }); } public OperatorTakeWhile(Func2 predicate) { this.predicate = predicate; } @Override public Subscriber call(final Subscriber subscriber) { Subscriber s = new Subscriber(subscriber, false) { private int counter; private boolean done; @Override public void onNext(T t) { boolean isSelected; try { isSelected = predicate.call(t, counter++); } catch (Throwable e) { done = true; Exceptions.throwOrReport(e, subscriber, t); unsubscribe(); return; } if (isSelected) { subscriber.onNext(t); } else { done = true; subscriber.onCompleted(); unsubscribe(); } } @Override public void onCompleted() { if (!done) { subscriber.onCompleted(); } } @Override public void onError(Throwable e) { if (!done) { subscriber.onError(e); } } }; subscriber.add(s); return s; } }





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