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Difference between revisions of "Developer's guide to building tools on top of AJDT and AspectJ"
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public class Program { | public class Program { | ||
public static void main(String []argv) { | public static void main(String []argv) { |
Revision as of 12:08, 4 January 2007
This page is intended to aid anyone developing tools to extend or work with AJDT/AspectJ. Please contribute to this page with any relevant information, such as example code using the AJDT and/or AspectJ APIs.
--Mpchapman.gmail.com 11:06, 4 January 2007 (EST)
Contents
Obtaining crosscutting relationship information from AJDT
(the following is derived from a post to the AJDT newsgroup on 26/10/2006)
If you're developing an eclipse plugin and require access to crosscutting information whenever a project is built, you can register a listener with AJDT. Your plug-in will need to depend on org.eclipse.ajdt.core, org.eclipse.core.resources and org.eclipse.jdt.core. In the org.eclipse.ajdt.core plug-in there is an IAdviceChangedListener interface with a single adviceChanged() method.
Register this with the AJBuilder class like this (in your plug-in's start() method for example):
AJBuilder.addAdviceListener(new MyAdviceListener());
Currently (AJDT 1.4) this is called after every build of an AspectJ project (i.e. every *potential* advice change). In a future release this may be optimized to be only called if the advice has actually changed. AJDT/UI uses this mechanism to update the orange arrow image decorator.
Crosscutting information can then be obtained from the AJModel class. Here's an example:
public class MyAdviceListener implements IAdviceChangedListener { public void adviceChanged() { IProject project = AspectJPlugin.getDefault() .getCurrentProject(); System.out.println("build detected for project: " + project); AJRelationshipType[] relsTypes = AJRelationshipManager .getAllRelationshipTypes(); List rels = AJModel.getInstance().getAllRelationships( project, relsTypes); for (Iterator iter = rels.iterator(); iter.hasNext();) { AJRelationship ajrel = (AJRelationship) iter.next(); System.out.println("Relationship: " + ajrel.getSource().getElementName() + " " + ajrel.getRelationship().getDisplayName() + " " + ajrel.getTarget().getElementName()); } } }
For the "TJP Example" project (File > New > Other > AspectJ > AspectJ Examples), this prints:
build detected for project: P/TJP Example Relationship: around advises main Relationship: around advises foo Relationship: around advises bar Relationship: bar advised by around Relationship: foo advised by around Relationship: main advised by around
As you can see, you get the relationship in both directions. See AJRelationshipManager for the full list of relationships, so you can just ask for the relationship types you're interested in.
AJRelationship.getSource() and getTarget() return instances of IJavaElement so you can obtain further information from that, such as the parent or underlying resource.
Using the AspectJ AST parser
Basic example, taken from bug 88861
import java.util.*; import org.aspectj.org.eclipse.jdt.core.dom.*; public class Program { public static void main(String []argv) { ASTParser parser = ASTParser.newParser(AST.JLS2); parser.setCompilerOptions(new HashMap()); parser.setSource(argv[0].toCharArray()); CompilationUnit cu2 = (CompilationUnit) parser.createAST(null); AjNaiveASTFlattener visitor = new AjNaiveASTFlattener(); cu2.accept(visitor); System.err.println(visitor.getResult()); } }
Compile the above and run it:
java Program "public aspect X { pointcut p(): call(* *(..));}"
then it prints:
public aspect X { pointcut p():call(* *(..)); }
See also bug 110465: Continue AST work
Known limitations, bugs, and outstanding issues
Limitation: There is currently no AST support for resolving type bindings: https://bugs.eclipse.org/bugs/show_bug.cgi?id=146528