69 lines
2.3 KiB
Java
69 lines
2.3 KiB
Java
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import javax.annotation.processing.*;
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import javax.lang.model.SourceVersion;
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import javax.lang.model.element.*;
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import javax.tools.Diagnostic.Kind;
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import java.lang.reflect.*;
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import java.lang.reflect.Modifier;
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import java.util.*;
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import java.lang.annotation.*;
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/** Check that a class marked {@code @Utility} is indeed a utility class. */
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@SupportedAnnotationTypes("Utility")
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@SupportedSourceVersion(SourceVersion.RELEASE_11)
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public class UtilityProcessor extends AbstractProcessor {
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@Override
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public boolean process(
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Set<? extends TypeElement> annotations,
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RoundEnvironment roundingEnvironment)
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{
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Messager messager = processingEnv.getMessager();
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messager.printMessage(Kind.NOTE,
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"UtilityProcessor executed.");
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messager.printMessage(Kind.WARNING,
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"The provided UtilityProcessor class is wrong. Correct it!");
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for (TypeElement te : annotations) {
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for (Element elt : roundingEnvironment.getElementsAnnotatedWith(te)) {
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// check if elt is a class
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if (elt.getKind() == ElementKind.CLASS) {
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// Check that the class is declared final
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if (Modifier.isFinal(elt.getModifiers())) {
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Class<?> cl = Class.forName(elt.getTagName());
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// Check that enclosed elements are static
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Method[] methods = cl.getMethods();
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for (Method method : methods) {
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if (!Modifier.isStatic(method.getModifiers())) {
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messager.printMessage(Kind.ERROR, "@Utility applies to class with STATIC mehthods only:", elt);
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break;
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}
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}
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// Check for constructors issues
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Constructor[] constructors = cl.getConstructors();
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System.out.println("nb construct : " + constructors.length);
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if (constructors.length != 1) {
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messager.printMessage(Kind.ERROR, "@Utility applies to class with only ONE constructor only:", elt);
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break;
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}
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for (Constructor constructor : constructors) {
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if (Modifier.isPrivate(constructor.getModifiers())) {
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messager.printMessage(Kind.ERROR, "@Utility applies to class with only a PRIVATE constructor only:", elt);
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break;
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}
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}
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} else {
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messager.printMessage(Kind.ERROR, "@Utility applies to FINAL class only:", elt);
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}
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} else {
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messager.printMessage(Kind.ERROR, "@Utility applies to CLASS only:", elt);
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}
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}
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}
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return true;
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}
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}
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