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/*******************************************************************************
* Copyright 2016-2019 Francesco Benincasa ([email protected])
*
* 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.abubusoft.kripton.common;
// TODO: Auto-generated Javadoc
/**
* Determines an output value based on an input value.
*
* The Functions class provides common functions and related utilites.
*
*
See the Guava User Guide article on the use of {@code
* Function}.
*
* @author Kevin Bourrillion
* @param the generic type
* @param the generic type
* @since 2.0 (imported from Google Collections Library)
*/
public interface Function {
/**
* Returns the result of applying this function to {@code input}. This method is generally
* expected, but not absolutely required, to have the following properties:
*
*
* - Its execution does not cause any observable side effects.
*
- The computation is consistent with equals; that is, Objects#equal
* {@code (a, b)} implies that {@code Objects.equal(function.apply(a),
* function.apply(b))}.
*
*
* @param input the input
* @return the t
* @throws NullPointerException if {@code input} is null and this function does not accept null
* arguments
*/
T apply(F input);
/**
* Indicates whether another object is equal to this function.
*
* Most implementations will have no reason to override the behavior of {@link Object#equals}.
* However, an implementation may also choose to return {@code true} whenever {@code object} is a
* {@link Function} that it considers interchangeable with this one. "Interchangeable"
* typically means that {@code Objects.equal(this.apply(f), that.apply(f))} is true for all
* {@code f} of type {@code F}. Note that a {@code false} result from this method does not imply
* that the functions are known not to be interchangeable.
*
* @param object the object
* @return true, if successful
*/
@Override
boolean equals(Object object);
}