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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 java.util.concurrent.atomic.AtomicReference;

import rx.*;
import rx.Observable.Operator;
import rx.exceptions.Exceptions;
import rx.functions.Func2;
import rx.observers.SerializedSubscriber;

/**
 * Combines values from two sources only when the main source emits.
 * @param  the element type of the main observable
 * @param  the element type of the other observable that is merged into the main
 * @param  the result element type
 */
public final class OperatorWithLatestFrom implements Operator  {
    final Func2 resultSelector;
    final Observable other;
    /** Indicates the other has not yet emitted a value. */
    static final Object EMPTY = new Object();

    public OperatorWithLatestFrom(Observable other, Func2 resultSelector) {
        this.other = other;
        this.resultSelector = resultSelector;
    }
    @Override
    public Subscriber call(Subscriber child) {
        // onError and onCompleted may happen either from the main or from other.
        final SerializedSubscriber s = new SerializedSubscriber(child, false);
        child.add(s);

        final AtomicReference