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/**
 * Copyright 2009-2014 the original author or authors.
 *
 * 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 net.javacrumbs.futureconverter.springrx;

import org.springframework.util.concurrent.ListenableFuture;
import rx.Observable;

public class FutureConverter {

    /**
     * Converts {@link org.springframework.util.concurrent.ListenableFuture} to  {@link rx.Observable}.
     * The original future is NOT canceled upon unsubscribe.* The original future is NOT canceled upon unsubscribe.
     * @param listenableFuture
     * @param 
     * @return
     */
    public static  Observable toObservable(ListenableFuture listenableFuture) {
        if (listenableFuture instanceof ObservableListenableFuture) {
            return ((ObservableListenableFuture) listenableFuture).getObservable();
        } else {
            return new ListenableFutureObservable<>(listenableFuture);
        }

    }

    /**
     * Converts  {@link rx.Observable} to {@link org.springframework.util.concurrent.ListenableFuture}.
     * Modifies the original Observable and takes only the first value.
     *
     * @param observable
     * @param 
     * @return
     */
    public static  ListenableFuture toListenableFuture(Observable observable) {
        if (observable instanceof ListenableFutureObservable) {
            return ((ListenableFutureObservable) observable).getListenableFuture();
        } else {
            return new ObservableListenableFuture<>(observable);
        }
    }

}