Java 类com.badlogic.gdx.utils.reflect.Annotation 实例源码

/**
 * Gets {@code NestedGenericType} annotation from object.
 * <p>
 * Looks at all object methods and returns first encountered annotation.
 *
 * @param object Object to deal with, not null
 * @return Annotation, may be null
 */
public static NestedGenericType getNestedGenericTypeAnnotation(Object object)
{
    NestedGenericType result = null;
    Method[] methods = ClassReflection.getMethods(object.getClass());
    // TODO - use type annotation, not method?
    for (Method m : methods) {
        Annotation[] annotations = m.getDeclaredAnnotations();
        Annotation a = m.getDeclaredAnnotation(NestedGenericType.class);
        if (a != null) {
            result = a.getAnnotation(NestedGenericType.class);
            break;
        }
    }
    return result;
}

private Metadata findMetadata (Class<?> clazz) {
    Metadata metadata = metadataCache.get(clazz);
    if (metadata == null) {
        Annotation tca = ClassReflection.getAnnotation(clazz, TaskConstraint.class);
        if (tca != null) {
            TaskConstraint taskConstraint = tca.getAnnotation(TaskConstraint.class);
            ObjectMap<String, AttrInfo> taskAttributes = new ObjectMap<String, AttrInfo>();
            Field[] fields = ClassReflection.getFields(clazz);
            for (Field f : fields) {
                Annotation a = f.getDeclaredAnnotation(TaskAttribute.class);
                if (a != null) {
                    AttrInfo ai = new AttrInfo(f.getName(), a.getAnnotation(TaskAttribute.class));
                    taskAttributes.put(ai.name, ai);
                }
            }
            metadata = new Metadata(taskConstraint.minChildren(), taskConstraint.maxChildren(), taskAttributes);
            metadataCache.put(clazz, metadata);
        }
    }
    return metadata;
}

private Metadata findMetadata (Class<?> clazz) {
    Metadata metadata = metadataCache.get(clazz);
    if (metadata == null) {
        Annotation tca = ClassReflection.getAnnotation(clazz, TaskConstraint.class);
        if (tca != null) {
            TaskConstraint taskConstraint = tca.getAnnotation(TaskConstraint.class);
            ObjectMap<String, AttrInfo> taskAttributes = new ObjectMap<String, AttrInfo>();
            Field[] fields = ClassReflection.getFields(clazz);
            for (Field f : fields) {
                Annotation a = f.getDeclaredAnnotation(TaskAttribute.class);
                if (a != null) {
                    AttrInfo ai = new AttrInfo(f.getName(), a.getAnnotation(TaskAttribute.class));
                    taskAttributes.put(ai.name, ai);
                }
            }
            metadata = new Metadata(taskConstraint.minChildren(), taskConstraint.maxChildren(), taskAttributes);
            metadataCache.put(clazz, metadata);
        }
    }
    return metadata;
}

/** @param classToProcess will be validated.
 * @return true if the class has at least 1 runtime annotation. */
public static boolean hasAnnotations(final Class<?> classToProcess) {
    try {
        final Annotation[] annotations = ClassReflection.getAnnotations(classToProcess);
        return annotations != null && annotations.length > 0;
    } catch (final Exception exception) {
        Exceptions.ignore(exception); // Somewhat expected on GWT.
        return false;
    }
}

/** @param classToProcess will be validated.
 * @return true if the class has at least 1 runtime annotation. */
public static boolean hasAnnotations(final Class<?> classToProcess) {
    try {
        final Annotation[] annotations = ClassReflection.getAnnotations(classToProcess);
        return annotations != null && annotations.length > 0;
    } catch (final Exception exception) {
        Exceptions.ignore(exception); // Somewhat expected on GWT.
        return false;
    }
}

private static StringBuilder appendTaskAttributes (StringBuilder attrs, Task<?> task) {
    Class<?> aClass = task.getClass();
    Field[] fields = ClassReflection.getFields(aClass);
    for (Field f : fields) {
        Annotation a = f.getDeclaredAnnotation(TaskAttribute.class);
        if (a == null) continue;
        TaskAttribute annotation = a.getAnnotation(TaskAttribute.class);
        attrs.append('\n');
        appendFieldString(attrs, task, annotation, f);
    }
    return attrs;
}