/**
 * 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.lang.groovy;

import groovy.lang.Closure;
import rx.Observable.OnSubscribe;
import rx.Subscriber;
import rx.Subscription;

public class GroovyCreateWrapper<T> implements OnSubscribe<T> {

    private final Closure<Void> closure;

    public GroovyCreateWrapper(Closure<Void> closure) {
        this.closure = closure;
    }

    @Override
    public void call(Subscriber<? super T> op) {
        Object o = closure.call(op);
        /*
         * If the new signature is being used, we will get NULL back.
         * If the old is being used we will get a Subscription back.
         */
        if (o != null) {
            op.add((Subscription) o);
        }
    }

}
