source: trunk/openjdk/langtools/test/tools/javac/T6855236.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 6855236
 * @summary Compiler Tree API TreePath class generates NullPointerException from Iterator
 * @compile T6855236.java
 * @compile -processor T6855236 -proc:only T6855236.java
 */

import java.util.*;

import javax.annotation.processing.*;
import javax.lang.model.*;
import javax.lang.model.element.*;

import com.sun.source.tree.*;
import com.sun.source.util.*;

@SupportedSourceVersion(SourceVersion.RELEASE_6)
@SupportedAnnotationTypes("*")
public class T6855236 extends AbstractProcessor {

    private Trees trees;

    @Override
    public void init(ProcessingEnvironment pe) {
        super.init(pe);
        trees = Trees.instance(pe);
    }

    @Override
    public boolean process(Set<? extends TypeElement> arg0, RoundEnvironment roundEnvironment) {
        // Scanner class to scan through various component elements
        CodeVisitor visitor = new CodeVisitor();

        for (Element e : roundEnvironment.getRootElements()) {
            TreePath tp = trees.getPath(e);
            visitor.scan(tp, trees);
        }

        return true;
    }

    class CodeVisitor extends TreePathScanner<Object, Trees> {

        @Override
        public Object visitMethodInvocation(MethodInvocationTree node, Trees p) {
            System.out.print("current path: ");
            for (Tree t : getCurrentPath()) {
                System.out.print('/');
                System.out.print(t);
           }
            System.out.println();
            System.out.println("parent path: " + getCurrentPath().getParentPath());
            System.out.println("method select: " + node.getMethodSelect().toString());
            for (ExpressionTree arg : node.getArguments()) {
                System.out.println("argument: " + arg.toString());
            }
            return super.visitMethodInvocation(node, p);
        }

        @Override
        public Object visitExpressionStatement(ExpressionStatementTree node, Trees p) {
            ExpressionTree t = node.getExpression();
            System.out.println("expression statement: " + t.toString());
            return super.visitExpressionStatement(node, p);
        }

    }

}