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rxjava-core developed by Netflix
/**
* 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;
public class Functions {
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromFunc(final Func0 f) {
return new FuncN() {
@Override
public R call(Object... args) {
if (args.length != 0) {
throw new RuntimeException("Func0 expecting 0 arguments.");
}
return f.call();
}
};
}
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromFunc(final Func1 f) {
return new FuncN() {
@SuppressWarnings("unchecked")
@Override
public R call(Object... args) {
if (args.length != 1) {
throw new RuntimeException("Func1 expecting 1 argument.");
}
return f.call((T0) args[0]);
}
};
}
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromFunc(final Func2 f) {
return new FuncN() {
@SuppressWarnings("unchecked")
@Override
public R call(Object... args) {
if (args.length != 2) {
throw new RuntimeException("Func2 expecting 2 arguments.");
}
return f.call((T0) args[0], (T1) args[1]);
}
};
}
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromFunc(final Func3 f) {
return new FuncN() {
@SuppressWarnings("unchecked")
@Override
public R call(Object... args) {
if (args.length != 3) {
throw new RuntimeException("Func3 expecting 3 arguments.");
}
return f.call((T0) args[0], (T1) args[1], (T2) args[2]);
}
};
}
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromFunc(final Func4 f) {
return new FuncN() {
@SuppressWarnings("unchecked")
@Override
public R call(Object... args) {
if (args.length != 4) {
throw new RuntimeException("Func4 expecting 4 arguments.");
}
return f.call((T0) args[0], (T1) args[1], (T2) args[2], (T3) args[3]);
}
};
}
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromFunc(final Func5 f) {
return new FuncN() {
@SuppressWarnings("unchecked")
@Override
public R call(Object... args) {
if (args.length != 5) {
throw new RuntimeException("Func5 expecting 5 arguments.");
}
return f.call((T0) args[0], (T1) args[1], (T2) args[2], (T3) args[3], (T4) args[4]);
}
};
}
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromFunc(final Func6 f) {
return new FuncN() {
@SuppressWarnings("unchecked")
@Override
public R call(Object... args) {
if (args.length != 6) {
throw new RuntimeException("Func6 expecting 6 arguments.");
}
return f.call((T0) args[0], (T1) args[1], (T2) args[2], (T3) args[3], (T4) args[4], (T5) args[5]);
}
};
}
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromFunc(final Func7 f) {
return new FuncN() {
@SuppressWarnings("unchecked")
@Override
public R call(Object... args) {
if (args.length != 7) {
throw new RuntimeException("Func7 expecting 7 arguments.");
}
return f.call((T0) args[0], (T1) args[1], (T2) args[2], (T3) args[3], (T4) args[4], (T5) args[5], (T6) args[6]);
}
};
}
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromFunc(final Func8 f) {
return new FuncN() {
@SuppressWarnings("unchecked")
@Override
public R call(Object... args) {
if (args.length != 8) {
throw new RuntimeException("Func8 expecting 8 arguments.");
}
return f.call((T0) args[0], (T1) args[1], (T2) args[2], (T3) args[3], (T4) args[4], (T5) args[5], (T6) args[6], (T7) args[7]);
}
};
}
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromFunc(final Func9 f) {
return new FuncN() {
@SuppressWarnings("unchecked")
@Override
public R call(Object... args) {
if (args.length != 9) {
throw new RuntimeException("Func9 expecting 9 arguments.");
}
return f.call((T0) args[0], (T1) args[1], (T2) args[2], (T3) args[3], (T4) args[4], (T5) args[5], (T6) args[6], (T7) args[7], (T8) args[8]);
}
};
}
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromAction(final Action0 f) {
return new FuncN() {
@Override
public Void call(Object... args) {
if (args.length != 0) {
throw new RuntimeException("Action0 expecting 0 arguments.");
}
f.call();
return null;
}
};
}
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromAction(final Action1 f) {
return new FuncN() {
@SuppressWarnings("unchecked")
@Override
public Void call(Object... args) {
if (args.length != 1) {
throw new RuntimeException("Action1 expecting 1 argument.");
}
f.call((T0) args[0]);
return null;
}
};
}
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromAction(final Action2 f) {
return new FuncN() {
@SuppressWarnings("unchecked")
@Override
public Void call(Object... args) {
if (args.length != 2) {
throw new RuntimeException("Action3 expecting 2 arguments.");
}
f.call((T0) args[0], (T1) args[1]);
return null;
}
};
}
/**
* Convert a function to FuncN to allow heterogeneous handling of functions with different arities.
*
* @param f
* @return {@link FuncN}
*/
public static FuncN fromAction(final Action3 f) {
return new FuncN() {
@SuppressWarnings("unchecked")
@Override
public Void call(Object... args) {
if (args.length != 3) {
throw new RuntimeException("Action3 expecting 3 arguments.");
}
f.call((T0) args[0], (T1) args[1], (T2) args[2]);
return null;
}
};
}
/**
* Constructs a predicate that returns true for each input that the source
* predicate returns false for and vice versa.
*
* @param predicate
* The source predicate to negate.
*/
public static Func1 not(Func1 predicate) {
return new Not(predicate);
}
public static Func1 alwaysTrue() {
return AlwaysTrue.INSTANCE;
}
public static Func1 alwaysFalse() {
return AlwaysFalse.INSTANCE;
}
public static Func1 identity() {
return new Func1() {
@Override
public T call(T o) {
return o;
}
};
}
private enum AlwaysTrue implements Func1 {
INSTANCE;
@Override
public Boolean call(Object o) {
return true;
}
}
private enum AlwaysFalse implements Func1 {
INSTANCE;
@Override
public Boolean call(Object o) {
return false;
}
}
@SuppressWarnings("unchecked")
public static NullFunction returnNull() {
return (NullFunction) NULL_FUNCTION;
}
private static final NullFunction NULL_FUNCTION = new NullFunction();
private static final class NullFunction implements
Func0,
Func1,
Func2,
Func3,
Func4,
Func5,
Func6,
Func7,
Func8,
Func9,
FuncN {
@Override
public R call() {
return null;
}
@Override
public R call(T0 t1) {
return null;
}
@Override
public R call(T0 t1, T1 t2) {
return null;
}
@Override
public R call(T0 t1, T1 t2, T2 t3) {
return null;
}
@Override
public R call(T0 t1, T1 t2, T2 t3, T3 t4) {
return null;
}
@Override
public R call(T0 t1, T1 t2, T2 t3, T3 t4, T4 t5) {
return null;
}
@Override
public R call(T0 t1, T1 t2, T2 t3, T3 t4, T4 t5, T5 t6) {
return null;
}
@Override
public R call(T0 t1, T1 t2, T2 t3, T3 t4, T4 t5, T5 t6, T6 t7) {
return null;
}
@Override
public R call(T0 t1, T1 t2, T2 t3, T3 t4, T4 t5, T5 t6, T6 t7, T7 t8) {
return null;
}
@Override
public R call(T0 t1, T1 t2, T2 t3, T3 t4, T4 t5, T5 t6, T6 t7, T7 t8, T8 t9) {
return null;
}
@Override
public R call(Object... args) {
return null;
}
}
}
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