Iterating over an AttributeSet Enumeration

I have the following code:

    private static boolean hasTargetStyle(AttributeSet attributes) {
        final Enumeration<?> attributeNames = attributes.getAttributeNames();
        while (开发者_JAVA技巧attributeNames.hasMoreElements()) {
            final Object attributeName = attributeNames.nextElement();
            if (attributeName.equals(MY_STYLE_NAME)) {
                return true;
            }
        }

        return false;
    }

Now I would think this code would step through each of the attribute names. But it's only giving me every other attribute name (the ones with even-numbered indices).

What's going wrong here?

I don't think it has an index - a Set doesn't have index. And the code looks fine. Unless the getAttributeNames() returns a wrongly-implementation enumeration, it should work.

I don't see anything wrong with your code at the moment, but try using Collections.list

private static boolean hasTargetStyle(AttributeSet attributes) {
    final List<?> attributeNames = Collections.list(attributes.getAttributeNames());

    for(Object name: attributeNames){
        if(name.equals(MY_STYLE_NAME)){
            return true;
        }
    }

    return false;
}

I doubt that this is a problem with java.util.Enumeration (although this is just an interface and the actual implementation may have a bug). Your implementation looks good to me.

Other idea: The initial AttributeSet may only contain every other attribute. Try to set a breakpoint and have a look at the internals of an actual attribute set.

The internal list I was looking at in the debugger had both names and values alternating. So, my code is correct in a certain sense, but my intent was wrong.