geronimo-jsp_2.1_spec/src/main/java/javax/servlet/jsp/tagext/SimpleTagSupport.java [178:212]:
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    public static final JspTag findAncestorWithClass(
	JspTag from, Class<?> klass) 
    {
	boolean isInterface = false;

	if (from == null || klass == null
	        || (!JspTag.class.isAssignableFrom(klass)
		    && !(isInterface = klass.isInterface()))) {
	    return null;
	}

	for (;;) {
	    JspTag parent = null;
	    if( from instanceof SimpleTag ) {
		parent = ((SimpleTag)from).getParent();
	    }
	    else if( from instanceof Tag ) {
		parent = ((Tag)from).getParent();
	    }
	    if (parent == null) {
		return null;
	    }

	    if (parent instanceof TagAdapter) {
		parent = ((TagAdapter) parent).getAdaptee();
	    }

	    if ((isInterface && klass.isInstance(parent))
		    || klass.isAssignableFrom(parent.getClass())) {
		return parent;
	    }

	    from = parent;
	}
    }    
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geronimo-jsp_2.2_spec/src/main/java/javax/servlet/jsp/tagext/SimpleTagSupport.java [178:212]:
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    public static final JspTag findAncestorWithClass(
	JspTag from, Class<?> klass) 
    {
	boolean isInterface = false;

	if (from == null || klass == null
	        || (!JspTag.class.isAssignableFrom(klass)
		    && !(isInterface = klass.isInterface()))) {
	    return null;
	}

	for (;;) {
	    JspTag parent = null;
	    if( from instanceof SimpleTag ) {
		parent = ((SimpleTag)from).getParent();
	    }
	    else if( from instanceof Tag ) {
		parent = ((Tag)from).getParent();
	    }
	    if (parent == null) {
		return null;
	    }

	    if (parent instanceof TagAdapter) {
		parent = ((TagAdapter) parent).getAdaptee();
	    }

	    if ((isInterface && klass.isInstance(parent))
		    || klass.isAssignableFrom(parent.getClass())) {
		return parent;
	    }

	    from = parent;
	}
    }    
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