/**

* Copyright 2013 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.joins;

import java.util.Map;

import rx.Observable;

import rx.Observer;

import rx.util.functions.Action1;

/**

* Represents an execution plan for join patterns.

*/

public abstract class Plan0<R> {

public abstract ActivePlan0 activate(Map<Object, JoinObserver> externalSubscriptions,

Observer<R> observer, Action1<ActivePlan0> deactivate);

@SuppressWarnings("unchecked")

public static <T> JoinObserver1<T> createObserver(

Map<Object, JoinObserver> externalSubscriptions,

Observable<T> observable,

Action1<Throwable> onError

) {

JoinObserver1<T> observer;

JoinObserver nonGeneric = externalSubscriptions.get(observable);

if (nonGeneric == null) {

observer = new JoinObserver1<T>(observable, onError);

externalSubscriptions.put(observable, observer);

} else {

observer = (JoinObserver1<T>)nonGeneric;

}

return observer;

}

}