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+ + + + Simplifies a client's code for constructing a Composite Reduces the repetitive and error-prone nature of Composite creation Creates a loose coupling between client and Composite Allows for different representations of the encapsulated Composite or complex object May not have the most intention-revealing interface
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Because there are numerous ways to write a Builder that builds a Composite, there cannot be one set of mechanics for this refactoring Instead, I'll offer general steps that you can implement as you see fit Whatever design you choose for your Builder, I suggest that you use test-driven development [Beck, TDD] to produce it The following mechanics assume you already have Composite-construction code and you'd like to encapsulate this code with a Builder
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1 Create a builder, a new class that will become a Builder DP] by the end of this refactoring Make it possible for your builder to [ produce a one-node Composite [DP] Add a method to the builder to obtain the result of its build
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Compile and test 2 Make the builder capable of building children This often involves creating multiple methods for allowing clients to easily direct the creation and positioning of children
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Compile and test 3 If the Composite-construction code you're replacing sets attributes or values on nodes, make the builder capable of setting those attributes and values
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Compile and test 4 Reflect on how simple your builder is for clients to use, and then make it simpler 5 Refactor your Composite-construction code to use the new builder This involves making your client code what is known in Design Patterns as a Builder: Client and Builder: Director
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The Composite I'd like to encapsulate with a Builder is called TagNode This class is featured in the refactoringReplace Implicit Tree with Composite (178) TagNode facilitates the creation of XML It plays all three Composite roles because the TagNode class is a Component, which can be either a Leaf or a Composite at runtime, as shown in the following diagram
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TagNode's toString() method outputs an XML representation of all TagNode objects it contains A TagBuilder will encapsulate TagNode, providing clients with a less repetitive and error-prone way to create a Composite of TagNode objects
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1 My first step is to create a builder that can successfully build one node In this case, I want to create a TagBuilder that produces the correct XML for a tree containing a single TagNode I begin by writing a failing test that uses assertXmlEquals, a method I wrote for comparing two pieces of XML:
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public class TagBuilderTest public void testBuildOneNode() { String expectedXml = "<flavors/>"; String actualXml = new TagBuilder("flavors")toXml(); assertXmlEquals(expectedXml, actualXml); }
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Passing that test is easy Here's the code I write:
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public class TagBuilder { private TagNode rootNode;
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public TagBuilder(String rootTagName) { rootNode = new TagNode(rootTagName); }
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public String toXml() { return rootNodetoString(); } }
The compiler and test code are happy with this new code 2 Now I'll make TagBuilder capable of handling children I want to deal with numerous scenarios, each of which causes me to write a different TagBuilder method I start with the scenario of adding a child to a root node Because I want TagBuilder to both create a child node and position it correctly within the encapsulated Composite, I decide to produce one method for doing just that, called addChild() The following test uses this method:
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