/*

 * Copyright (c) 2004, 2007, 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 com.sun.mirror.apt.*;

import com.sun.mirror.declaration.*;

import com.sun.mirror.type.*;

import com.sun.mirror.util.*;

import java.util.Collection;

import java.util.Set;

import java.util.Arrays;

import java.util.Collections;

import java.io.*;

public class Touch implements AnnotationProcessorFactory {

    static class TouchProc implements AnnotationProcessor {

        AnnotationProcessorEnvironment ape;

        TouchProc(AnnotationProcessorEnvironment ape) {

            this.ape = ape;

        }

        public void process() {

            boolean result;

            // Only run the processor on the initial apt invocation

            Collection<TypeDeclaration> tdecls = ape.getSpecifiedTypeDeclarations();

            if (tdecls.size() == 1) {

                for(TypeDeclaration decl: tdecls) {

                    if (! decl.getSimpleName().equals("Touch") )

                        return;

                }

                try {

                    // Create temporary file

                    java.io.File f = new java.io.File("touched");

                    result = f.createNewFile();

                    Filer filer = ape.getFiler();

                    // Create new source file

                    PrintWriter pw = filer.createSourceFile("HelloWorld");

                    pw.println("public class HelloWorld {");

                    pw.println("  public static void main(String argv[]) {");

                    pw.println("    System.out.println(\"Hello World\");");

                    pw.println("  }");

                    pw.println("}");

                    // Create new class file and copy Empty.class

                    OutputStream os = filer.createClassFile("Empty");

                    FileInputStream fis = new FileInputStream("Empty.clazz");

                    int datum;

                    while((datum = fis.read()) != -1)

                        os.write(datum);

                } catch (java.io.IOException e) {

                    result = false;

                }

                if (!result)

                    throw new RuntimeException("touched file already exists or other error");

            }

        }

    }

    static Collection<String> supportedTypes;

    static {

        String types[] = {"*"};

        supportedTypes = Collections.unmodifiableCollection(Arrays.asList(types));

    }

    static Collection<String> supportedOptions;

    static {

        String options[] = {""};

        supportedOptions = Collections.unmodifiableCollection(Arrays.asList(options));

    }

    public Collection<String> supportedOptions() {

        return supportedOptions;

    }

    public Collection<String> supportedAnnotationTypes() {

        return supportedTypes;

    }

    /*

     * Return the same processor independent of what annotations are

     * present, if any.

     */

    public AnnotationProcessor getProcessorFor(Set<AnnotationTypeDeclaration> atds,

                                        AnnotationProcessorEnvironment env) {

        return new TouchProc(env);

    }

}