Figure 3316 SearchEngine Builds a Search Result from Search Patterns and Search Scopes in Java

Creating USS Code 128 in Java Figure 3316 SearchEngine Builds a Search Result from Search Patterns and Search Scopes
Figure 3316 SearchEngine Builds a Search Result from Search Patterns and Search Scopes
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The SearchEngine acts as the Director and notifies its Builder, theIJavaSearchResultCollector, when a match is found Before a search starts, the SearchEngine informs the builder with aboutToStart() The actual matches are then reported withaccept() Figure 3317 illustrates the different result collectors playing the role of a Builder
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Figure 3317 IJavaSearchResultCollector Implementors
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Code Assist follows the Builder pattern to report results as well (see Figure 3318) Code Assist performs code completions at a given textual position inside a compilation unit
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Figure 3318 ICodeAssist Is a Builder
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Code Assist reports its findings to the Builder ICompletionRequestor The results are reported specifically to the type of the completion element
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338 Abstract Syntax Tree Analysis Visitor
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The Java model supports navigating the Java element tree However, the model is too coarse-grained to allow for a detailed analysis of code The Java core provides access to a compilation unit's abstract syntax tree (AST) An AST represents the result of parsing and analyzing the compilation unit Figure 3319 shows the AST for the following compilation unit
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TestFailure
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import junitframeworkTestCase; public class TestFailure extends TestCase { public void testFailure() { fail(); } }
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Figure 3319 Abstract Syntax Tree
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Each node of the AST represents an element of the program and keeps track of its source range and its bindings A binding represents references to named entities as seen by the compiler The AST nodes are defined in a hierarchy descending from ASTNode An AST is constructed from a compilation unit or class file with the help of the factory class AST, as shown in Figure 3320
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Figure 3320 AST Creates ASTNodes
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There is a different AST node for each Java source-code construct (see Figure 3321)
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Figure 3321 ASTNode Subclasses
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The reason for creating an AST is to analyze a compilation unit To do the analysis, you traverse the AST and perform actions depending on the node type AST analysis is a prototypical use of Visitor The key consideration for applying Visitor is whether the class hierarchy defining the node structure is stable Adding a new class to the node hierarchy would make it difficult to maintain a Visitor since existing Visitors would need to be modified The source constructs of a language are stable (at least between major releases) Therefore the node hierarchy remains stable and Visitor is useful The AST API provides an abstract class, ASTVisitor The ASTVisitor defines a visit method for each node type (see Figure 3322)
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Figure 3322 ASTVisitor Visits ASTNodes
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The ASTVisitor provided by Java core comes with some Visitor implementation variations that are worth mentioning Implementing a generic visitor that isn't interested in most node types is painful A client has to override over sixty methods For this reason the ASTVisitor provides two generic visit methods: preVisit(ASTNode) and postVisit(ASTNode) Clients can override these two methods to perform a non-type-specific traversal of an AST For example, counting all nodes in an AST can be done with the following simple visitor:
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CountingVisitor
class CountingVisitor extends ASTVisitor { int count= 0; public void postVisit (ASTNode node) { count++; } public int getCount() { return count; } } It can then be called as follows:
CompilationUnit cu; CountingVisitor visitor= new CountingVisitor();
cuaccept(visitor); Systemoutprintln(visitorgetCount()); The other interesting variation is that ASTVistor provides both avisit() and an endVisit() method:
The method visit() is called before descending into a node Clients can returnfalse from visit() when they don't want to descend into a particular node The method endVisit() is called after all the descendent nodes are visited
Here is an example illustrating the use of visit() and endVisit() Let's assume we want to collect a metric, the number of method invocations in each method To simplify the example, let's further assume that no local or anonymous types are used (Handling these types properly requires storing the method count in a stack) Below is the visitor implementation for this simplified scenario:
class CallsPerMethodVisitor extends ASTVisitor { int callCount= 0; public boolean visit(MethodDeclaration node) { callCount= 0; return supervisit(node); } public void endVisit (MethodDeclaration node) { Systemoutprintln("calls in "+nodegetName()+":"+ callCount); } public boolean visit(MethodInvocation node) { callCount++; return true; } }
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