Eclipse JDT: get the ASTNode from an IJavaElement

EclipseASTResolver.java

import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IMember;
import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.ASTParser;
import org.eclipse.jdt.core.dom.CompilationUnit;

/** An AST node <em>resolver</em>. */
public class EclipseASTResolver {
	
	/**
	 * Parses the AST node for a specified <em>Java</em> element.
	 * @param javaElement
	 * The <em>Java</em> element to parse the AST node for.
	 * @return The parsed AST node.
	 */
	public ASTNode parseASTNodeForElement(IJavaElement javaElement) {
		if(javaElement instanceof IMember) {
		    IMember member = (IMember)javaElement;
		    // Fetch the Java model compilation unit
		    ICompilationUnit cUnit = member.getCompilationUnit();
		    // Note the simple name of the java element in the compilation unit
		    String simpleName = javaElement.getElementName();
		    // Parse the source 
		    // (the language specification version should suit your needs)
		    ASTParser parser = ASTParser.newParser(AST.JLS3);
		    parser.setSource(cUnit);
		    parser.setResolveBindings(true);
		    // Fetch the AST node for the compilation unit
		    ASTNode unitNode = parser.createAST(new NullProgressMonitor());
		    // It should be an AST compilation unit
		    if(unitNode instanceof CompilationUnit) {
		      CompilationUnit sourceUnit = (CompilationUnit)unitNode;
		      ASTNode elementNode = sourceUnit.findDeclaringNode(simpleName);
		      return elementNode;
		    }
		}
		// (you might wish to throw an exception here)
		return null;
	}
}