public void process()
	{
		Messager messager = _env.getMessager();
		File sourceFile = null;
		ArrayList<ConditionStatement> csList = new ArrayList<ConditionStatement>();
		
		// obtain the declaration of the annotation we want to process
		AnnotationTypeDeclaration annoDecl = (AnnotationTypeDeclaration)_env.getTypeDeclaration(ConditionAnnotation.class.getName());
		
		// get the annotated types
		Collection<Declaration> annotatedTypes = _env.getDeclarationsAnnotatedWith(annoDecl);
		
		for (Declaration decl : annotatedTypes) {
			ConditionStatement cs = new ConditionStatement();
			cs.setLineNumber(decl.getPosition().line());
			Collection<AnnotationMirror> mirrors = decl.getAnnotationMirrors();
			
			// for each annotation found, get a map of element name/value pairs
			for (AnnotationMirror mirror : mirrors) {
				Map<AnnotationTypeElementDeclaration, AnnotationValue> valueMap = mirror.getElementValues();
				Set<Map.Entry<AnnotationTypeElementDeclaration, AnnotationValue>> valueSet = valueMap.entrySet();
				
				// the annotation processor understands two elements: "Pre" and "Post"
				for (Map.Entry<AnnotationTypeElementDeclaration, AnnotationValue> annoKeyValue : valueSet) {                                        
					AnnotationValue annoValue = annoKeyValue.getValue();        // get the name
					sourceFile = annoValue.getPosition().file();
					
					if (annoKeyValue.getKey().getSimpleName().equals("Pre")) {
						Object PreValue = annoValue.getValue();                        // get the value
						if (!(PreValue instanceof String)) {// controllo che sia una stringa
							messager.printError(annoValue.getPosition(), "Insert a string condition: Condition(Pre=String)");
						}
						else {
							cs.setPreCondition(annoValue.getValue());
						}
					}
					else if (annoKeyValue.getKey().getSimpleName().equals("Post")) {
						Object PostValue = annoValue.getValue();                        // get the value
						if (!(PostValue instanceof String)) {// controllo che sia una stringa
							messager.printError(annoValue.getPosition(), "Insert a string condition: Condition(Post=String)");
						}
						else {
							cs.setPostCondition(annoValue.getValue());
						}
					}
					else {// errore nell'inserimento del campo
						messager.printError(annoValue.getPosition(), "@Condition accepts only Pre() and Post() parameters");                                                
					}
				}
			}
			csList.add(cs);
		}
	}