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    <p>In java, i thought about using annotation processing. The apt tool scans the source file before actually parsing the source file to the javac command.</p> <p>During compilation of the source files, the output will be printed out:</p> <pre><code>@Documented @Retention(RetentionPolicy.RUNTIME) @Target({ElementType.TYPE, ElementType.METHOD}) public @interface MyInterface { int offset() default 0; int last() default 100; } </code></pre> <p>The processor factory:</p> <pre><code>public class MyInterfaceAnnotationProcessorFactory implements AnnotationProcessorFactory { public Collection&lt;String&gt; supportedOptions() { System.err.println("Called supportedOptions............................."); return Collections.EMPTY_LIST; } public Collection&lt;String&gt; supportedAnnotationTypes() { System.err.println("Called supportedAnnotationTypes..........................."); return Collections.singletonList("practiceproject.MyInterface"); } public AnnotationProcessor getProcessorFor(Set&lt;AnnotationTypeDeclaration&gt; set, AnnotationProcessorEnvironment ape) { System.err.println("Called getProcessorFor................"); if (set.isEmpty()) { return AnnotationProcessors.NO_OP; } return new MyInterfaceAnnotationProcessor(ape); } } </code></pre> <p>The actual annotation processor:</p> <pre><code>public class MyInterfaceAnnotationProcessor implements AnnotationProcessor { private AnnotationProcessorEnvironment ape; private AnnotationTypeDeclaration atd; public MyInterfaceAnnotationProcessor(AnnotationProcessorEnvironment ape) { this.ape = ape; atd = (AnnotationTypeDeclaration) ape.getTypeDeclaration("practiceproject.MyInterface"); } public void process() { Collection&lt;Declaration&gt; decls = ape.getDeclarationsAnnotatedWith(atd); for (Declaration dec : decls) { processDeclaration(dec); } } private void processDeclaration(Declaration d) { Collection&lt;AnnotationMirror&gt; ams = d.getAnnotationMirrors(); for (AnnotationMirror am : ams) { if (am.getAnnotationType().getDeclaration().equals(atd)) { Map&lt;AnnotationTypeElementDeclaration, AnnotationValue&gt; values = am.getElementValues(); int offset = 0; int last = 100; for (Map.Entry&lt;AnnotationTypeElementDeclaration, AnnotationValue&gt; entry : values.entrySet()) { AnnotationTypeElementDeclaration ated = entry.getKey(); AnnotationValue v = entry.getValue(); String name = ated.getSimpleName(); if (name.equals("offset")) { offset = ((Integer) v.getValue()).intValue(); } else if (name.equals("last")) { last = ((Integer) v.getValue()).intValue(); } } //find the sum System.err.println("Sum: " + ((last + 1 - offset) / 2) * (2 * offset + (last - offset))); } } } } </code></pre> <p>Then we create a source file. simple class that uses MyInterface annotation:</p> <pre><code> @MyInterface(offset = 1, last = 1000) public class Main { @MyInterface void doNothing() { System.out.println("Doing nothing"); } /** * @param args the command line arguments */ public static void main(String[] args) { // TODO code application logic here Main m = new Main(); m.doNothing(); MyInterface my = (MyInterface) m.getClass().getAnnotation(MyInterface.class); System.out.println("offset: " + my.offset()); System.out.println("Last: " + my.last()); } } </code></pre> <p>The annotation processor is compiled into a jar file, then the apt tool is used to compile the source file as:</p> <pre><code>apt -cp "D:\Variance project\PracticeProject\dist\practiceproject.jar" -factory practiceproject.annotprocess.MyInterfaceAnnotationProcessorFactory "D:\Variance project\PracticeProject2\src\practiceproject2\Main.java" </code></pre> <p>The output of the project:</p> <pre><code>Called supportedAnnotationTypes........................... Called getProcessorFor................ Sum: 5000 Sum: 500500 </code></pre>
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    1. CO+1 Wowww .... Seems interesting :-)
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