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/**

* 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;

/**

* An object representing a notification sent to an {@link Observable}.

*

* For the Microsoft Rx equivalent see: http://msdn.microsoft.com/en-us/library/hh229462(v=vs.103).aspx

*/

public class Notification<T> {

private final Kind kind;

private final Throwable throwable;

private final T value;

/**

* A constructor used to represent an onNext notification.

*

* @param value

* The data passed to the onNext method.

*/

public Notification(T value) {

this.value = value;

this.throwable = null;

this.kind = Kind.OnNext;

}

/**

* A constructor used to represent an onError notification.

*

* @param exception

* The exception passed to the onError notification.

*/

public Notification(Throwable exception) {

this.throwable = exception;

this.value = null;

this.kind = Kind.OnError;

}

/**

* A constructor used to represent an onCompleted notification.

*/

public Notification() {

this.throwable = null;

this.value = null;

this.kind = Kind.OnCompleted;

}

/**

* Retrieves the exception associated with an onError notification.

*

* @return Throwable associated with an onError notification.

*/

public Throwable getThrowable() {

return throwable;

}

/**

* Retrieves the data associated with an onNext notification.

*

* @return The data associated with an onNext notification.

*/

public T getValue() {

return value;

}

/**

* Retrieves a value indicating whether this notification has a value.

*

* @return a value indicating whether this notification has a value.

*/

public boolean hasValue() {

return isOnNext() && value != null;

}

/**

* Retrieves a value indicating whether this notification has an exception.

*

* @return a value indicating whether this notification has an exception.

*/

public boolean hasThrowable() {

return isOnError() && throwable != null;

}

/**

* Retrieves the kind of the notification: OnNext, OnError, OnCompleted

*

* @return the kind of the notification: OnNext, OnError, OnCompleted

*/

public Kind getKind() {

return kind;

}

public boolean isOnError() {

return getKind() == Kind.OnError;

}

public boolean isOnCompleted() {

return getKind() == Kind.OnCompleted;

}

public boolean isOnNext() {

return getKind() == Kind.OnNext;

}

public void accept(Observer<? super T> observer) {

if (isOnNext()) {

observer.onNext(getValue());

} else if (isOnCompleted()) {

observer.onCompleted();

} else if (isOnError()) {

observer.onError(getThrowable());

}

}

public static enum Kind {

OnNext, OnError, OnCompleted

}

@Override

public String toString() {

StringBuilder str = new StringBuilder("[").append(super.toString()).append(" ").append(getKind());

if (hasValue())

str.append(" ").append(getValue());

if (hasThrowable())

str.append(" ").append(getThrowable().getMessage());

str.append("]");

return str.toString();

}

@Override

public int hashCode() {

int hash = getKind().hashCode();

if (hasValue())

hash = hash * 31 + getValue().hashCode();

if (hasThrowable())

hash = hash * 31 + getThrowable().hashCode();

return hash;

}

@Override

public boolean equals(Object obj) {

if (obj == null)

return false;

if (this == obj)

return true;

if (obj.getClass() != getClass())

return false;

Notification<?> notification = (Notification<?>) obj;

if (notification.getKind() != getKind())

return false;

if (hasValue() && !getValue().equals(notification.getValue()))

return false;

if (hasThrowable() && !getThrowable().equals(notification.getThrowable()))

return false;

return true;

}

}