/**
* Filters a Collection of <code>Class</code> objects. The returned collection only contains those
* classes that have an attribute of the specified type. That is, for each Class clazz in the
* returned collection, <code>clazz != null && Attributes.hasAttributeType (clazz, attributeClass)
* </code> is true.
*
* @param classes Collection of Classes to filter. May contain <code>null</code> references, but
* may not itself be <code>null</code>.
* @param attributeClass the class to filter based on.
* @since 2.1
*/
public static Collection getClassesWithAttributeType(Collection classes, Class attributeClass) {
if (classes == null) {
throw new NullPointerException("classes");
}
if (attributeClass == null) {
throw new NullPointerException("attributeClass");
}
ArrayList result = new ArrayList();
Iterator iter = classes.iterator();
while (iter.hasNext()) {
Class clazz = (Class) iter.next();
if (clazz != null) {
if (Attributes.hasAttributeType(clazz, attributeClass)) {
result.add(clazz);
}
}
}
return result;
}
/**
* Filters a collection of objects. The returned collection only contains those objects whose
* class have an attribute of the specified type. That is, for each Object o in the returned
* collection, <code>o != null && Attributes.hasAttributeType (o.getClass (), attributeClass)
* </code> is true.
*
* @param objects Collection of objects to filter. May contain <code>null</code> references, but
* may not itself be <code>null</code>.
* @param attributeClass the class to filter based on.
* @since 2.1
*/
public static Collection getObjectsWithAttributeType(Collection objects, Class attributeClass) {
if (objects == null) {
throw new NullPointerException("objects");
}
if (attributeClass == null) {
throw new NullPointerException("attributeClass");
}
ArrayList result = new ArrayList();
Iterator iter = objects.iterator();
while (iter.hasNext()) {
Object object = iter.next();
if (object != null) {
Class clazz = object.getClass();
if (Attributes.hasAttributeType(clazz, attributeClass)) {
result.add(object);
}
}
}
return result;
}