/**

* 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.operators;

import rx.Observable.Operator;

import rx.Subscriber;

import rx.exceptions.OnErrorThrowable;

import rx.functions.Func1;

/**

* Applies a function of your choosing to every item emitted by an Observable, and returns this

* transformation as a new Observable.

* <p>

* <img width="640" src="https://github.com/Netflix/RxJava/wiki/images/rx-Observers/map.png">

*/

public final class OperatorMap<T, R> implements Operator<R, T> {

private final Func1<? super T, ? extends R> transformer;

public OperatorMap(Func1<? super T, ? extends R> transformer) {

this.transformer = transformer;

}

@Override

public Subscriber<? super T> call(final Subscriber<? super R> o) {

return new Subscriber<T>(o) {

@Override

public void onCompleted() {

o.onCompleted();

}

@Override

public void onError(Throwable e) {

o.onError(e);

}

@Override

public void onNext(T t) {

try {

o.onNext(transformer.call(t));

} catch (Throwable e) {

onError(OnErrorThrowable.addValueAsLastCause(e, t));

}

}

};

}

}