/**

* 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.functions;

import rx.Observer;

/**

* Utility class for the Action interfaces.

*/

public final class Actions {

private Actions() {

throw new IllegalStateException("No instances!");

}

@SuppressWarnings("unchecked")

public static final <T0, T1, T2, T3, T4, T5, T6, T7, T8, T9> EmptyAction<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9> empty() {

return (EmptyAction<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>) EMPTY_ACTION;

}

@SuppressWarnings("rawtypes")

private static final EmptyAction EMPTY_ACTION = new EmptyAction();

private static final class EmptyAction<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9> implements

Action0,

Action1<T0>,

Action2<T0, T1>,

Action3<T0, T1, T2>,

Action4<T0, T1, T2, T3>,

Action5<T0, T1, T2, T3, T4>,

Action6<T0, T1, T2, T3, T4, T5>,

Action7<T0, T1, T2, T3, T4, T5, T6>,

Action8<T0, T1, T2, T3, T4, T5, T6, T7>,

Action9<T0, T1, T2, T3, T4, T5, T6, T7, T8>,

ActionN {

@Override

public void call() {

}

@Override

public void call(T0 t1) {

}

@Override

public void call(T0 t1, T1 t2) {

}

@Override

public void call(T0 t1, T1 t2, T2 t3) {

}

@Override

public void call(T0 t1, T1 t2, T2 t3, T3 t4) {

}

@Override

public void call(T0 t1, T1 t2, T2 t3, T3 t4, T4 t5) {

}

@Override

public void call(T0 t1, T1 t2, T2 t3, T3 t4, T4 t5, T5 t6) {

}

@Override

public void call(T0 t1, T1 t2, T2 t3, T3 t4, T4 t5, T5 t6, T6 t7) {

}

@Override

public void call(T0 t1, T1 t2, T2 t3, T3 t4, T4 t5, T5 t6, T6 t7, T7 t8) {

}

@Override

public void call(T0 t1, T1 t2, T2 t3, T3 t4, T4 t5, T5 t6, T6 t7, T7 t8, T8 t9) {

}

@Override

public void call(Object... args) {

}

}

/**

* Extracts a method reference to the observer's onNext method

* in the form of an Action1.

* <p>Java 8: observer::onNext</p>

*

* @param observer

* the observer to use

* @return an action which calls the observer's onNext method.

*/

public static <T> Action1<T> onNextFrom(final Observer<T> observer) {

return new Action1<T>() {

@Override

public void call(T t1) {

observer.onNext(t1);

}

};

}

/**

* Extracts a method reference to the observer's onError method

* in the form of an Action1.

* <p>Java 8: observer::onError</p>

*

* @param observer

* the observer to use

* @return an action which calls the observer's onError method.

*/

public static <T> Action1<Throwable> onErrorFrom(final Observer<T> observer) {

return new Action1<Throwable>() {

@Override

public void call(Throwable t1) {

observer.onError(t1);

}

};

}

/**

* Extracts a method reference to the observer's onCompleted method

* in the form of an Action0.

* <p>Java 8: observer::onCompleted</p>

*

* @param observer

* the observer to use

* @return an action which calls the observer's onCompleted method.

*/

public static <T> Action0 onCompletedFrom(final Observer<T> observer) {

return new Action0() {

@Override

public void call() {

observer.onCompleted();

}

};

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @return {@link Func0}

*/

public static Func0<Void> toFunc(final Action0 action) {

return toFunc(action, (Void) null);

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @return {@link Func0}

*/

public static <T1> Func1<T1, Void> toFunc(final Action1<T1> action) {

return toFunc(action, (Void) null);

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @return {@link Func0}

*/

public static <T1, T2> Func2<T1, T2, Void> toFunc(final Action2<T1, T2> action) {

return toFunc(action, (Void) null);

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @return {@link Func0}

*/

public static <T1, T2, T3> Func3<T1, T2, T3, Void> toFunc(final Action3<T1, T2, T3> action) {

return toFunc(action, (Void) null);

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @return {@link Func0}

*/

public static <T1, T2, T3, T4> Func4<T1, T2, T3, T4, Void> toFunc(final Action4<T1, T2, T3, T4> action) {

return toFunc(action, (Void) null);

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @return {@link Func0}

*/

public static <T1, T2, T3, T4, T5> Func5<T1, T2, T3, T4, T5, Void> toFunc(

final Action5<T1, T2, T3, T4, T5> action) {

return toFunc(action, (Void) null);

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @return {@link Func0}

*/

public static <T1, T2, T3, T4, T5, T6> Func6<T1, T2, T3, T4, T5, T6, Void> toFunc(

final Action6<T1, T2, T3, T4, T5, T6> action) {

return toFunc(action, (Void) null);

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @return {@link Func0}

*/

public static <T1, T2, T3, T4, T5, T6, T7> Func7<T1, T2, T3, T4, T5, T6, T7, Void> toFunc(

final Action7<T1, T2, T3, T4, T5, T6, T7> action) {

return toFunc(action, (Void) null);

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @return {@link Func0}

*/

public static <T1, T2, T3, T4, T5, T6, T7, T8> Func8<T1, T2, T3, T4, T5, T6, T7, T8, Void> toFunc(

final Action8<T1, T2, T3, T4, T5, T6, T7, T8> action) {

return toFunc(action, (Void) null);

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @return {@link Func0}

*/

public static <T1, T2, T3, T4, T5, T6, T7, T8, T9> Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, Void> toFunc(

final Action9<T1, T2, T3, T4, T5, T6, T7, T8, T9> action) {

return toFunc(action, (Void) null);

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @return {@link Func0}

*/

public static FuncN<Void> toFunc(

final ActionN action) {

return toFunc(action, (Void) null);

}

/**

* Convert an action to a function which calls

* the action returns the given result.

*

* @param action

* @param result

* @return {@link Func0}

*/

public static <R> Func0<R> toFunc(final Action0 action, final R result) {

return new Func0<R>() {

@Override

public R call() {

action.call();

return result;

}

};

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @param result

* @return {@link Func0}

*/

public static <T1, R> Func1<T1, R> toFunc(final Action1<T1> action, final R result) {

return new Func1<T1, R>() {

@Override

public R call(T1 t1) {

action.call(t1);

return result;

}

};

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @param result

* @return {@link Func0}

*/

public static <T1, T2, R> Func2<T1, T2, R> toFunc(final Action2<T1, T2> action, final R result) {

return new Func2<T1, T2, R>() {

@Override

public R call(T1 t1, T2 t2) {

action.call(t1, t2);

return result;

}

};

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @param result

* @return {@link Func0}

*/

public static <T1, T2, T3, R> Func3<T1, T2, T3, R> toFunc(final Action3<T1, T2, T3> action, final R result) {

return new Func3<T1, T2, T3, R>() {

@Override

public R call(T1 t1, T2 t2, T3 t3) {

action.call(t1, t2, t3);

return result;

}

};

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @param result

* @return {@link Func0}

*/

public static <T1, T2, T3, T4, R> Func4<T1, T2, T3, T4, R> toFunc(final Action4<T1, T2, T3, T4> action, final R result) {

return new Func4<T1, T2, T3, T4, R>() {

@Override

public R call(T1 t1, T2 t2, T3 t3, T4 t4) {

action.call(t1, t2, t3, t4);

return result;

}

};

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @param result

* @return {@link Func0}

*/

public static <T1, T2, T3, T4, T5, R> Func5<T1, T2, T3, T4, T5, R> toFunc(

final Action5<T1, T2, T3, T4, T5> action, final R result) {

return new Func5<T1, T2, T3, T4, T5, R>() {

@Override

public R call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5) {

action.call(t1, t2, t3, t4, t5);

return result;

}

};

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @param result

* @return {@link Func0}

*/

public static <T1, T2, T3, T4, T5, T6, R> Func6<T1, T2, T3, T4, T5, T6, R> toFunc(

final Action6<T1, T2, T3, T4, T5, T6> action, final R result) {

return new Func6<T1, T2, T3, T4, T5, T6, R>() {

@Override

public R call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6) {

action.call(t1, t2, t3, t4, t5, t6);

return result;

}

};

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @param result

* @return {@link Func0}

*/

public static <T1, T2, T3, T4, T5, T6, T7, R> Func7<T1, T2, T3, T4, T5, T6, T7, R> toFunc(

final Action7<T1, T2, T3, T4, T5, T6, T7> action, final R result) {

return new Func7<T1, T2, T3, T4, T5, T6, T7, R>() {

@Override

public R call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6, T7 t7) {

action.call(t1, t2, t3, t4, t5, t6, t7);

return result;

}

};

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @param result

* @return {@link Func0}

*/

public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Func8<T1, T2, T3, T4, T5, T6, T7, T8, R> toFunc(

final Action8<T1, T2, T3, T4, T5, T6, T7, T8> action, final R result) {

return new Func8<T1, T2, T3, T4, T5, T6, T7, T8, R>() {

@Override

public R call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6, T7 t7, T8 t8) {

action.call(t1, t2, t3, t4, t5, t6, t7, t8);

return result;

}

};

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @param result

* @return {@link Func0}

*/

public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, R> toFunc(

final Action9<T1, T2, T3, T4, T5, T6, T7, T8, T9> action, final R result) {

return new Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, R>() {

@Override

public R call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6, T7 t7, T8 t8, T9 t9) {

action.call(t1, t2, t3, t4, t5, t6, t7, t8, t9);

return result;

}

};

}

/**

* Convert an action to a function which calls

* the action returns Void (null).

*

* @param action

* @param result

* @return {@link Func0}

*/

public static <R> FuncN<R> toFunc(

final ActionN action, final R result) {

return new FuncN<R>() {

@Override

public R call(Object... args) {

action.call(args);

return result;

}

};

}

}