Examples of javax.annotation.processing.Filer

javax.annotation.processing.Filer
etf.org/rfc/rfc3986.txt">RFC 3986, section 3.3.
The file creation methods take a variable number of arguments to allow the originating elements to be provided as hints to the tool infrastructure to better manage dependencies. The originating elements are the types or packages (representing {@code package-info} files) which caused an annotation processor toattempt to create a new file. For example, if an annotation processor tries to create a source file, {@code GeneratedFromUserSource}, in response to processing
```
 @Generate public class UserSource {} 
```
the type element for {@code UserSource} should be passed as part ofthe creation method call as in:
```
 filer.createSourceFile("GeneratedFromUserSource", eltUtils.getTypeElement("UserSource")); 
```
If there are no originating elements, none need to be passed. This information may be used in an incremental environment to determine the need to rerun processors or remove generated files. Non-incremental environments may ignore the originating element information.
During each run of an annotation processing tool, a file with a given pathname may be created only once. If that file already exists before the first attempt to create it, the old contents will be deleted. Any subsequent attempt to create the same file during a run will throw a {@link FilerException}, as will attempting to create both a class file and source file for the same type name or same package name. The {@linkplain Processor initial inputs} tothe tool are considered to be created by the zeroth round; therefore, attempting to create a source or class file corresponding to one of those inputs will result in a {@link FilerException}.
In general, processors must not knowingly attempt to overwrite existing files that were not generated by some processor. A {@code Filer} may reject attempts to open a file corresponding to anexisting type, like {@code java.lang.Object}. Likewise, the invoker of the annotation processing tool must not knowingly configure the tool such that the discovered processors will attempt to overwrite existing files that were not generated.
Processors can indicate a source or class file is generated by including an {@link javax.annotation.Generated @Generated}annotation.
Note that some of the effect of overwriting a file can be achieved by using a decorator-style pattern. Instead of modifying a class directly, the class is designed so that either its superclass is generated by annotation processing or subclasses of the class are generated by annotation processing. If the subclasses are generated, the parent class may be designed to use factories instead of public constructors so that only subclass instances would be presented to clients of the parent class. @author Joseph D. Darcy @author Scott Seligman @author Peter von der Ahé @since 1.6


    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
      if (roundEnv.processingOver()) {
        try {
          Filer filer = processingEnv.getFiler();
          FileObject o = filer.getResource(location, key.packageFQN, key.name);
          result = o.getCharContent(false);
        }
        catch (IOException e) {
          result = e;
        }

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      }


      //
      if (!done) {
        try {
          Filer filer = processingEnv.getFiler();
          JavaFileObject b = filer.createSourceFile("compiler.processor.B");
          PrintWriter writer = new PrintWriter(b.openWriter());
          writer.println("package compiler.processor; public class B { }");
          writer.close();
          done = true;
        }

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    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
      if (!done) {


        try {
          Filer filer = processingEnv.getFiler();
          FileObject foo = filer.getResource(StandardLocation.CLASS_OUTPUT, "", "foo.txt");
          deleted = foo.delete();
          done = true;
        }
        catch (IOException e) {
          e.printStackTrace();

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    if (key == null) {
      throw new NullPointerException("No null path accepted");
    }
    try {
      log.info("Attempt to resolve " + key + " from classpath");
      Filer classPath = env.getFiler();
      FileObject object = classPath.getResource(StandardLocation.CLASS_PATH, key.packageFQN, key.name);
      if (object != null && object.getLastModified() > 0) {
        return object;
      }
    }
    catch (IOException e) {

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     */
    protected void processFile(String packageName, String fileName, Func1<PrintWriter, Void> handler) {
        PrintWriter writer = null;
        try {
            Writer out = null;
            Filer filer = processingEnv.getFiler();
            FileObject resource;
            try {
                resource = filer.getResource(StandardLocation.CLASS_OUTPUT, packageName, fileName);
            } catch (Throwable e) {
                //resource = filer.createResource(StandardLocation.CLASS_OUTPUT, "org.apache.camel", "CamelAPT2.txt", rootElements.toArray(new Element[rootElements.size()]));
                resource = filer.createResource(StandardLocation.CLASS_OUTPUT, packageName, fileName, new Element[0]);
            }
            URI uri = resource.toUri();
            File file = null;
            if (uri != null) {
                try {

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            final MustacheFactory factory = new DefaultMustacheFactory();
            final Mustache mustache = factory.compile("templates/template.mustache");


            try {
                final Filer filer = processingEnv.getFiler();
                final JavaFileObject file = filer.createSourceFile(type.getName().getQualified());


                try (Writer writer = file.openWriter()) {
                    mustache.execute(writer, type).flush();
                }
            } catch (IOException e) {

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            final MustacheFactory factory = new DefaultMustacheFactory();
            final Mustache mustache = factory.compile("templates/template.mustache");


            try {
                final Filer filer = processingEnv.getFiler();
                final JavaFileObject file = filer.createSourceFile(type.getName().getQualified());


                try (Writer writer = file.openWriter()) {
                    mustache.execute(writer, type).flush();
                }
            } catch (IOException e) {

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                    list.add(e.toString());
                }
            }


            if (!classes.isEmpty()) {
                final Filer filer = processingEnv.getFiler();
                FileObject fo = filer.createResource(StandardLocation.CLASS_OUTPUT, "", "META-INF/restmodelextensions");
                bw = new BufferedWriter(fo.openWriter());
                // parent model:model extension
                for (Map.Entry<String, List<String>> entry : classes.entrySet()) {
                    final String key = entry.getKey();
                    for (String ext : entry.getValue()) {

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  }
  
  public boolean process(Set<? extends TypeElement> annotations,
      RoundEnvironment roundEnv) {
    ProcessingEnvironment env = super.processingEnv;
    Filer filer = env.getFiler();
    Set<TypeElement> annotatedDecls = (Set<TypeElement>) roundEnv.getElementsAnnotatedWith(AsyncService.class);
    for(Iterator<TypeElement> i = annotatedDecls.iterator(); i.hasNext(); ) {
      writeAsyncType(filer,i.next());
    }
    return true;

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        return name+"_handler.xml";
    }


    private void generateHandlerChainFile(Element hChains, String name) {
        
        Filer filer = options.filer;


        try {
            IndentingWriter p;
            FileObject jfo;
            if (filer != null) { 
                jfo = filer.createResource(StandardLocation.SOURCE_OUTPUT, 
                        Names.getPackageName(name), getHandlerConfigFileName(name));
                options.addGeneratedFile(new File(jfo.toUri()));
                p = new IndentingWriter(new OutputStreamWriter(jfo.openOutputStream()));
            } else { // leave for backw. compatibility now
                String hcName = getHandlerConfigFileName(name);

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