com.ibasco.agql.core.util.Functions Maven / Gradle / Ivy
/*
* Copyright (c) 2022 Asynchronous Game Query Library
*
* 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 com.ibasco.agql.core.util;
import org.jetbrains.annotations.ApiStatus;
import java.util.function.Function;
/**
* Utilities for Functional Interfaces
*
* @author Rafael Luis Ibasco
*/
@ApiStatus.Internal
public class Functions {
/** Constant TRUE */
public static final Function TRUE = unused -> true;
/** Constant FALSE */
public static final Function FALSE = unused -> false;
/**
* Cast argument to it's returning type
*
* @param a
* a A object
* @param
* The captured type of the parameter
* @param
* The captured return type
*
* @return The casted instance
*/
public static B cast(A a) {
//noinspection unchecked
return (B) a;
}
/**
* Cast argument into the captured type
*
* @param b
* a B object
* @param
* a B class
* @param
* a C class
*
* @return a C object
*/
public static C convert(B b) {
//noinspection unchecked
return (C) b;
}
/**
* returnArg.
*
* @param a
* a A object
* @param
* a A class
*
* @return a A object
*/
public static A returnArg(A a) {
return a;
}
/**
* Select first argument of the function and return it
*
* @param a
* a A object
* @param b
* a B object
* @param
* a A class
* @param
* a B class
*
* @return a A object
*/
public static A selectFirst(A a, B b) {
return a;
}
/**
* Select second argument of the function and return it
*
* @param a
* a A object
* @param b
* a B object
* @param
* a A class
* @param
* a B class
*
* @return a B object
*/
public static B selectSecond(A a, B b) {
return b;
}
/**
* isTypeOf.
*
* @param v
* a {@link java.lang.Object} object
* @param arr
* a {@link java.lang.Class} object
*
* @return a boolean
*/
public static boolean isTypeOf(Object v, Class... arr) {
if (arr == null || arr.length == 0)
return false;
for (Class c : arr) {
if (c.equals(v.getClass()))
return true;
}
return false;
}
}