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Commit1698b06

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Merge pull requestiluwatar#767 from nikhilbarar/collection-pipeline
iluwatar#564: Collection Pipeline pattern
2 parents038befe +4ed039d commit1698b06

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‎collection-pipeline/README.md

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---
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layout:pattern
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title:Collection Pipeline
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folder:collection-pipeline
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permalink:/patterns/collection-pipeline/
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categories:Functional
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tags:
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-Java
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-Difficulty-Beginner
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-Functional
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---
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##Intent
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Collection Pipeline introduces Function Composition and Collection Pipeline, two functional-style patterns that you can combine to iterate collections in your code.
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In functional programming, it's common to sequence complex operations through a series of smaller modular functions or operations. The series is called a composition of functions, or a function composition. When a collection of data flows through a function composition, it becomes a collection pipeline. Function Composition and Collection Pipeline are two design patterns frequently used in functional-style programming.
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![alt text](./etc/collection-pipeline.png"Collection Pipeline")
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##Applicability
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Use the Collection Pipeline pattern when
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* When you want to perform a sequence of operations where one operation's collected output is fed into the next
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* When you use a lot of statements in your code
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* When you use a lot of loops in your code
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##Credits
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*[Function composition and the Collection Pipeline pattern](https://www.ibm.com/developerworks/library/j-java8idioms2/index.html)
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*[Martin Fowler](https://martinfowler.com/articles/collection-pipeline/)
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*[Java8 Streams](https://docs.oracle.com/javase/8/docs/api/java/util/stream/package-summary.html)
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<?xml version="1.0" encoding="UTF-8"?>
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<class-diagramversion="1.2.2"icons="true"always-add-relationships="false"generalizations="true"realizations="true"
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associations="true"dependencies="false"nesting-relationships="true"router="FAN">
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<classid="1"language="java"name="com.iluwatar.collectionpipeline.App"project="collection-pipeline"
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file="/collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/App.java"binary="false"
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corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="150"y="100"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</display>
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</class>
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<classid="2"language="java"name="com.iluwatar.collectionpipeline.ImperativeProgramming"
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project="collection-pipeline"
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file="/collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/ImperativeProgramming.java"binary="false"
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corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="437"y="109"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</display>
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</class>
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<classid="3"language="java"name="com.iluwatar.collectionpipeline.Car"project="collection-pipeline"
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file="/collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/Car.java"binary="false"
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corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="724"y="339"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</display>
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</class>
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<classid="4"language="java"name="com.iluwatar.collectionpipeline.CarFactory"project="collection-pipeline"
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file="/collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/CarFactory.java"binary="false"
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corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="899"y="91"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</display>
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</class>
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<classid="5"language="java"name="com.iluwatar.collectionpipeline.FunctionalProgramming"
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project="collection-pipeline"
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file="/collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/FunctionalProgramming.java"binary="false"
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corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="1187"y="109"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</display>
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</class>
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<enumerationid="6"language="java"name="com.iluwatar.collectionpipeline.Category"project="collection-pipeline"
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file="/collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/Category.java"binary="false"
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corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="486"y="339"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="true"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</display>
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</enumeration>
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<classid="7"language="java"name="com.iluwatar.collectionpipeline.Person"project="collection-pipeline"
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file="/collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/Person.java"binary="false"
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corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="723"y="91"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</display>
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</class>
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<associationid="8">
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<endtype="SOURCE"refId="7"navigable="false">
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<attributeid="9"name="cars"/>
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<multiplicityid="10"minimum="0"maximum="2147483647"/>
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</end>
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<endtype="TARGET"refId="3"navigable="true"/>
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<displaylabels="true"multiplicity="true"/>
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</association>
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<associationid="11">
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<endtype="SOURCE"refId="3"navigable="false">
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<attributeid="12"name="category"/>
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<multiplicityid="13"minimum="0"maximum="1"/>
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</end>
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<endtype="TARGET"refId="6"navigable="true"/>
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<displaylabels="true"multiplicity="true"/>
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</association>
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<classifier-displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</classifier-display>
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<association-displaylabels="true"multiplicity="true"/>
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</class-diagram>

‎collection-pipeline/pom.xml

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<!--
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The MIT License
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Copyright (c) 2014 Ilkka Seppälä
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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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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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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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<projectxmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>com.iluwatar</groupId>
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<artifactId>java-design-patterns</artifactId>
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<version>1.20.0-SNAPSHOT</version>
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</parent>
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<artifactId>collection-pipeline</artifactId>
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<dependencies>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>
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/**
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* The MIT License
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* Copyright (c) 2014 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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packagecom.iluwatar.collectionpipeline;
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importjava.util.Arrays;
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importjava.util.List;
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importjava.util.Map;
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importorg.slf4j.Logger;
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importorg.slf4j.LoggerFactory;
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/**
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* In imperative-style programming, it is common to use for and while loops for
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* most kinds of data processing. Function composition is a simple technique
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* that lets you sequence modular functions to create more complex operations.
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* When you run data through the sequence, you have a collection pipeline.
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* Together, the Function Composition and Collection Pipeline patterns enable
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* you to create sophisticated programs where data flow from upstream to
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* downstream and is passed through a series of transformations.
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*
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*/
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publicclassApp {
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privatestaticfinalLoggerLOGGER =LoggerFactory.getLogger(App.class);
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/**
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* Program entry point.
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*
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* @param args
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* command line args
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*/
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publicstaticvoidmain(String[]args) {
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List<Car>cars =CarFactory.createCars();
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List<String>modelsImperative =ImperativeProgramming.getModelsAfter2000(cars);
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LOGGER.info(modelsImperative.toString());
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List<String>modelsFunctional =FunctionalProgramming.getModelsAfter2000(cars);
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LOGGER.info(modelsFunctional.toString());
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Map<Category,List<Car>>groupingByCategoryImperative =ImperativeProgramming.getGroupingOfCarsByCategory(cars);
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LOGGER.info(groupingByCategoryImperative.toString());
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Map<Category,List<Car>>groupingByCategoryFunctional =FunctionalProgramming.getGroupingOfCarsByCategory(cars);
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LOGGER.info(groupingByCategoryFunctional.toString());
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Personjohn =newPerson(cars);
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List<Car>sedansOwnedImperative =ImperativeProgramming.getSedanCarsOwnedSortedByDate(Arrays.asList(john));
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LOGGER.info(sedansOwnedImperative.toString());
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List<Car>sedansOwnedFunctional =FunctionalProgramming.getSedanCarsOwnedSortedByDate(Arrays.asList(john));
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LOGGER.info(sedansOwnedFunctional.toString());
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}
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}
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/**
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* The MIT License
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* Copyright (c) 2014 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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packagecom.iluwatar.collectionpipeline;
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/**
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* A Car class that has the properties of make, model, year and category.
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*/
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publicclassCar {
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privateStringmake;
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privateStringmodel;
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privateintyear;
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privateCategorycategory;
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/**
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* Constructor to create an instance of car.
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* @param make the make of the car
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* @param model the model of the car
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* @param yearOfMake the year of built of the car
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* @param category the {@link Category} of the car
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*/
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publicCar(Stringmake,Stringmodel,intyearOfMake,Categorycategory) {
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this.make =make;
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this.model =model;
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this.year =yearOfMake;
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this.category =category;
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}
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@Override
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publicinthashCode() {
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finalintprime =31;
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intresult =1;
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result =prime *result + ((category ==null) ?0 :category.hashCode());
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result =prime *result + ((make ==null) ?0 :make.hashCode());
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result =prime *result + ((model ==null) ?0 :model.hashCode());
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result =prime *result +year;
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returnresult;
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}
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@Override
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publicbooleanequals(Objectobj) {
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if (this ==obj) {
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returntrue;
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}
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if (obj ==null) {
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returnfalse;
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}
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if (getClass() !=obj.getClass()) {
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returnfalse;
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}
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Carother = (Car)obj;
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if (category !=other.category) {
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returnfalse;
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}
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if (make ==null) {
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if (other.make !=null) {
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returnfalse;
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}
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}elseif (!make.equals(other.make)) {
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returnfalse;
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}
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if (model ==null) {
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if (other.model !=null) {
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returnfalse;
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}
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}elseif (!model.equals(other.model)) {
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returnfalse;
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}
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if (year !=other.year) {
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returnfalse;
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}
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returntrue;
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}
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publicStringgetMake() {
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returnmake;
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}
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publicStringgetModel() {
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returnmodel;
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}
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publicintgetYear() {
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returnyear;
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}
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publicCategorygetCategory() {
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returncategory;
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}
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}

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