/*

  * Copyright (c) 2010, 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

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

import java.util.Set;

import javax.annotation.processing.*;

import javax.lang.model.element.*;

import javax.lang.model.util.ElementFilter;

import javax.lang.model.SourceVersion;

import static javax.tools.Diagnostic.Kind.*;

@SupportedAnnotationTypes("*")

public class MyProcessor extends AbstractProcessor {

    private Messager messager;

    public void init(ProcessingEnvironment processingEnv) {

        this.messager = processingEnv.getMessager();

    }

    public boolean process(Set<? extends TypeElement> tes, RoundEnvironment renv) {

        if (!renv.processingOver()) {

            for(TypeElement e : ElementFilter.typesIn(renv.getRootElements())) {

                for (TypeParameterElement tp : e.getTypeParameters()) {

                    if (tp.getSimpleName().toString().length() > 1) {

                        messager.printMessage(WARNING,

                            "Type param names should be of length 1", tp);

                    }

                }

            }

        }

        return true;

    }

    public SourceVersion getSupportedSourceVersion() {

        return SourceVersion.latest();

    }

}