igor-brishkoski

public class AwesomeLoggerProcessor extends AbstractProcessor {
    @Override
    public synchronized void init(ProcessingEnvironment env){ }

    @Override
    public boolean process(Set<? extends TypeElement> annoations, RoundEnvironment env) { }

    @Override
    public Set<String> getSupportedAnnotationTypes() { }

igor-brishkoski

//processor module
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile project(':annotation')
        
    compile 'com.google.auto.service:auto-service:1.0-rc2'
}

igor-brishkoski

@AutoService(Processor.class)
public class AwesomeLoggerProcessor extends AbstractProcessor {
  private static final String KEY_PARAM_NAME = "args";
  private static final String METHOD_LOG = "log";
  private static final String CLASS_SUFFIX = "_Log";
  private Messager messager;
  private Filer filer;
  
  @Override
  public synchronized void init(ProcessingEnvironment processingEnvironment) {

igor-brishkoski

ElementType.METHOD
ElementType.PACKAGE
ElementType.PARAMETER
ElementType.TYPE
ElementType.ANNOTATION_TYPE
ElementType.CONSTRUCTOR
ElementType.LOCAL_VARIABLE
ElementType.FIELD

igor-brishkoski

@Override
public boolean process(Set<? extends TypeElement> set, RoundEnvironment roundEnvironment) {
    //get all elements annotated with AwesomeLogger
    Collection<? extends Element> annotatedElements = roundEnvironment.getElementsAnnotatedWith(AwesomeLogger.class);

    for (Element type : annotatedElements) {
      ...
    }

    return true;

igor-brishkoski

@Override
public boolean process(Set<? extends TypeElement> set, RoundEnvironment roundEnvironment) {
    //get all elements annotated with AwesomeLogger
    Collection<? extends Element> annotatedElements = roundEnvironment.getElementsAnnotatedWith(AwesomeLogger.class);

    //filter out elements we don't need
    List<TypeElement> types = new ImmutableList.Builder<TypeElement>()
            .addAll(ElementFilter.typesIn(annotatedElements))
            .build();

igor-brishkoski

package com.example;		// PackageElement

public class User {		// TypeElement

	private String firstName;// VariableElement
	private String lastName; // VariableElement

	public User () {} 	// ExecuteableElement
}

igor-brishkoski

private boolean isValidClass(TypeElement type){
    if(type.getKind() != ElementKind.CLASS){
        messager.printMessage(Diagnostic.Kind.ERROR,type.getSimpleName()+" only classes can be annotated with AwesomeLogger");
        return false;
    }

    if(type.getModifiers().contains(Modifier.PRIVATE)){
        messager.printMessage(Diagnostic.Kind.ERROR,type.getSimpleName()+" only public classes can be annotated with AwesomeLogger");
        return false;
    }

igor-brishkoski

private void writeSourceFile(TypeElement originatingType) {
    //get Log class from android.util package
    //This will make sure the Log class is properly imported into our class
    ClassName logClassName = ClassName.get("android.util", "Log");

    //get the current annotated class name
    TypeVariableName typeVariableName = TypeVariableName.get(originatingType.getSimpleName().toString());

    //create static void method named log
    MethodSpec log = MethodSpec.methodBuilder(METHOD_LOG)

igor-brishkoski

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        User g = new User("Gandalf", "The White", "Maia");

        User_Log.log(g);
    }