Here are the steps for refactoring StringNode's decoding logic to a Decorator in Java

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Here are the steps for refactoring StringNode's decoding logic to a Decorator
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1 My first step is to identify or create an enclosure type, a class or interface that declares all public methods of StringNode and whatever public methods it inherits A good enclosure type won't contain fields (ie, state) So StringNode's superclass, AbstractNode, is not a good enclosure type because it contains the two primitiveint fields, nodeBegin and nodeEnd Why does it matter whether a class contains fields Decorators add behavior to the objects they decorate, but they don't need duplicate copies of the fields in those objects In this case, because StringNode already inherits nodeBegin and nodeEnd from AbstractNode, Decorators of StringNode don't also need to inherit those fields So I rule out AbstractNode as the enclosure type The next natural place to look is the interface thatAbstractNode implements, which is called Node The following diagram shows this interface
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This would be the perfect enclosure type, except that it doesn't include StringNode's two public methods, getText() and setText( ) I must add these methods to theNode interface in order to pave the way for creating a transparent enclosure for StringNode I'm not happy about this step, for it means expanding the interface of Node just to accommodate this refactoring However, I proceed anyway, knowing that a future refactoring will combine toPlainTextString() and getText(), thereby reducing the size of the Node interface In Java, adding the getText() and setText( ) methods to the Node interface means that all concrete classes that implement Node must implement getText() and setText( ) or inherit implementations of them StringNode contains the implementations of getText() and setText( ), but AbstractNode and some of its subclasses (which aren't shown in this example) have no such implementation (or have only one of the two methods defined) To obtain the solution I need, I must apply the refactoring Unify Interfaces (343) This refactoring adds getText() and setText( ) to Node and outfits AbstractNode with the following default (do-nothing) versions of the methods, which all subclasses either inherit and/or override:
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public abstract class AbstractNode
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public String getText() { return null; }
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public void setText(String text) { }
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2 I can now work towards replacing the decoding embellishment insideStringNode by applying the refactoring Replace Conditional with Polymorphism [F] Applying that refactoring involves producing an inheritance structure that will look like the one shown here
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To produce this inheritance structure, I applyReplace Type Code with Subclasses [F] The first step in implementing that refactoring is to apply Self-Encapsulate Field [F] on shouldDecode, the type code inside StringNode The following code shows where shouldDecode is referenced or used withinStringNode:
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public class StringNode extends AbstractNode
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private boolean shouldDecode = false;
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public StringNode( StringBuffer textBuffer, int textBegin, int textEnd, boolean shouldDecode) { this(textBuffer, textBegin, textEnd);
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thisshouldDecode = shouldDecode;
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} public String toPlainTextString() { String result = textBuffertoString(); if
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(shouldDecode)
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result = Translatedecode(result); return result; }
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To self-encapsulate shouldDecode, I make the following changes:
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public class StringNode extends AbstractNode public StringNode( StringBuffer textBuffer, int textBegin, int textEnd, boolean shouldDecode) { this(textBuffer, textBegin, textEnd);
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setShouldDecode(shouldDecode);
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} public String toPlainTextString() { String result = textBuffertoString(); if (
shouldDecode())
result = Translatedecode(result); return result;
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private void setShouldDecode(boolean shouldDecode) { thisshouldDecode = shouldDecode; }
private boolean shouldDecode() { return shouldDecode; }
I've nearly self-encapsulated shouldDecode, except for the newStringNode constructor Because it accepts the type code shouldDecode as a parameter, I need to replace this constructor with a Creation Method (as described in the mechanics to Replace Type Code with Subclasses [F]) The Decorator mechanics also tell me to make the return type of this Creation Method be Node, which is the enclosure type that will be vital to implementing the Decorator pattern Here's the new Creation Method: