Using the Eclipse AST

Question

I have recently come into the need of modifying some Java code (adding methods, changing the signatures of some fields and removing methods) and I think that all of this can be

Answer 1

I will not post the whole source code to this problem here because it is quite long but I will get people started.

All the docs that you will need are here: http://publib.boulder.ibm.com/infocenter/iadthelp/v6r0/index.jsp?topic=/org.eclipse.jdt.doc.isv/reference/api/org/eclipse/jdt/core/dom/package-summary.html

Document document = new Document("import java.util.List;\n\nclass X\n{\n\n\tpublic void deleteme()\n\t{\n\t}\n\n}\n");
ASTParser parser = ASTParser.newParser(AST.JLS3);
parser.setSource(document.get().toCharArray());
CompilationUnit cu = (CompilationUnit)parser.createAST(null);
cu.recordModifications();

That will create a compilation unit for you from the source code that you pass in.

Now this is a simple function that prints out all of the methods inside the class definitions in what you have passed:

List types = cu.types();
for(AbstractTypeDeclaration type : types) {
    if(type.getNodeType() == ASTNode.TYPE_DECLARATION) {
        // Class def found
        List bodies = type.bodyDeclarations();
        for(BodyDeclaration body : bodies) {
            if(body.getNodeType() == ASTNode.METHOD_DECLARATION) {
                MethodDeclaration method = (MethodDeclaration)body;
                System.out.println("method declaration: ");
                System.out.println("name: " + method.getName().getFullyQualifiedName());
                System.out.println("modifiers: " + method.getModifiers());
                System.out.println("return type: " + method.getReturnType2().toString());
            }
        }
    }
}

This should get you all started.

It does take some time to get used to this (a lot in my case). But it does work and is the best method I could get my hands on.

Good luck ;)

ExtremeCoder

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Edit:

Before I forget, these are the imports that I used to get this working (I took quite a bit of time to get these organized):

org.eclipse.jdt.core_xxxx.jar
org.eclipse.core.resources_xxxx.jar
org.eclipse.core.jobs_xxxx.jar
org.eclipse.core.runtime_xxxx.jar
org.eclipse.core.contenttype_xxxx.jar
org.eclipse.equinox.common_xxxx.jar
org.eclipse.equinox.preferences_xxxx.jar
org.eclipse.osgi_xxxx.jar
org.eclipse.text_xxxx.jar

Where xxxx represents a version number.