/*

 * Copyright (c) 2010, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

/*

 * @test

 * @bug 6855236

 * @summary Compiler Tree API TreePath class generates NullPointerException from Iterator

 * @modules jdk.compiler

 * @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.*;

@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;

    }

    @Override

    public SourceVersion getSupportedSourceVersion() {

        return SourceVersion.latest();

    }

    class CodeVisitor extends TreePathScanner<Object, Trees> {

        @Override

        public Object visitMethodInvocation(MethodInvocationTree node, Trees p) {

            System.out.println("current path: ");

            for (Tree t : getCurrentPath()) {

                System.out.println("    " + t.getKind() + ": " + trim(t, 64));

            }

            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();

            System.out.println("expression statement: " + trim(t, 64));

            return super.visitExpressionStatement(node, p);

        }

    }

    private String trim(Tree t, int len) {

        String s = t.toString().trim().replaceAll("\\s+", " ");

        if (s.length() > len)

            s = s.substring(0, len) + "...";

        return s;

    }

}