68 lines
3.3 KiB
Java
68 lines
3.3 KiB
Java
/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.pipeline;
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/**
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* The Pipeline pattern uses ordered stages to process a sequence of input values. Each implemented
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* task is represented by a stage of the pipeline. You can think of pipelines as similar to assembly
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* lines in a factory, where each item in the assembly line is constructed in stages. The partially
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* assembled item is passed from one assembly stage to another. The outputs of the assembly line
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* occur in the same order as that of the inputs.
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*
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* <p>Classes used in this example are suffixed with "Handlers", and synonymously refers to the
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* "stage".
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*/
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public class App {
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/**
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* Specify the initial input type for the first stage handler and the expected output type of the
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* last stage handler as type parameters for Pipeline. Use the fluent builder by calling
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* addHandler to add more stage handlers on the pipeline.
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*/
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public static void main(String[] args) {
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/*
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Suppose we wanted to pass through a String to a series of filtering stages and convert it
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as a char array on the last stage.
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- Stage handler 1 (pipe): Removing the alphabets, accepts a String input and returns the
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processed String output. This will be used by the next handler as its input.
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- Stage handler 2 (pipe): Removing the digits, accepts a String input and returns the
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processed String output. This shall also be used by the last handler we have.
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- Stage handler 3 (pipe): Converting the String input to a char array handler. We would
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be returning a different type in here since that is what's specified by the requirement.
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This means that at any stages along the pipeline, the handler can return any type of data
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as long as it fulfills the requirements for the next handler's input.
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Suppose we wanted to add another handler after ConvertToCharArrayHandler. That handler
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then is expected to receive an input of char[] array since that is the type being returned
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by the previous handler, ConvertToCharArrayHandler.
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*/
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var filters = new Pipeline<>(new RemoveAlphabetsHandler())
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.addHandler(new RemoveDigitsHandler())
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.addHandler(new ConvertToCharArrayHandler());
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filters.execute("GoYankees123!");
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}
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}
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