rx.internal.util.UtilityFunctions Maven / Gradle / Ivy
/**
* 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.util;
import rx.functions.Func1;
/**
* Utility functions for internal use that we don't want part of the public API.
*/
public final class UtilityFunctions {
/** Utility class. */
private UtilityFunctions() {
throw new IllegalStateException("No instances!");
}
/**
* Returns a function that always returns {@code true}.
*
* @param the value type
* @return a {@link Func1} that accepts an Object and returns the Boolean {@code true}
*/
public static Func1 super T, Boolean> alwaysTrue() {
return AlwaysTrue.INSTANCE;
}
/**
* Returns a function that always returns {@code false}.
*
* @param the value type
* @return a {@link Func1} that accepts an Object and returns the Boolean {@code false}
*/
public static Func1 super T, Boolean> alwaysFalse() {
return AlwaysFalse.INSTANCE;
}
/**
* Returns a function that always returns the Object it is passed.
*
* @param the input and output value type
* @return a {@link Func1} that accepts an Object and returns the same Object
*/
public static Func1 identity() {
return new Func1() {
@Override
public T call(T o) {
return o;
}
};
}
enum AlwaysTrue implements Func1
© 2015 - 2024 Weber Informatics LLC | Privacy Policy