AnnoProc.java

/*
 * 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.io.*;
import java.util.*;
import javax.annotation.processing.*;
import javax.lang.model.*;
import javax.lang.model.element.*;
import javax.tools.*;

@SupportedAnnotationTypes("*")
public class AnnoProc extends AbstractProcessor {
    public boolean process(Set<? extends TypeElement> elems, RoundEnvironment renv) {
        if (++round == 1) {
            Filer filer = processingEnv.getFiler();
            Messager messager = processingEnv.getMessager();
            try {
                FileObject fo = filer.createSourceFile("HelloWorld.java");
                try (Writer out = fo.openWriter()) {
                    out.write("class HelloWorld {\n");
                    out.write("  public static void main(String[] args) {\n");
                    out.write("    System.out.println(\"Hello World!\");\n");
                    out.write("  }\n");
                    out.write("}\n");
                }
            } catch (IOException e) {
                messager.printMessage(Diagnostic.Kind.ERROR, e.toString());
            }
        }
        return false;
    }

    public SourceVersion getSupportedSourceVersion() {
        return SourceVersion.latest();
    }

    int round = 0;
}