public static void checkAttributes()

in src/main/java/org/apache/sling/scripting/jsp/jasper/compiler/JspUtil.java [226:316]
69 lines of code
18 McCabe index (conditional complexity)

    public static void checkAttributes(String typeOfTag,
                       Node n,
                       ValidAttribute[] validAttributes,
                       ErrorDispatcher err)
                throws JasperException {
        Attributes attrs = n.getAttributes();
        Mark start = n.getStart();
    boolean valid = true;

        // AttributesImpl.removeAttribute is broken, so we do this...
        int tempLength = (attrs == null) ? 0 : attrs.getLength();
    Vector temp = new Vector(tempLength, 1);
        for (int i = 0; i < tempLength; i++) {
            String qName = attrs.getQName(i);
            if ((!qName.equals("xmlns")) && (!qName.startsWith("xmlns:")))
                temp.addElement(qName);
        }

        // Add names of attributes specified using jsp:attribute
        Node.Nodes tagBody = n.getBody();
        if( tagBody != null ) {
            int numSubElements = tagBody.size();
            for( int i = 0; i < numSubElements; i++ ) {
                Node node = tagBody.getNode( i );
                if( node instanceof Node.NamedAttribute ) {
                    String attrName = node.getAttributeValue( "name" );
                    temp.addElement( attrName );
            // Check if this value appear in the attribute of the node
            if (n.getAttributeValue(attrName) != null) {
            err.jspError(n, "jsp.error.duplicate.name.jspattribute",
                    attrName);
            }
                }
                else {
                    // Nothing can come before jsp:attribute, and only
                    // jsp:body can come after it.
                    break;
                }
            }
        }

    /*
     * First check to see if all the mandatory attributes are present.
     * If so only then proceed to see if the other attributes are valid
     * for the particular tag.
     */
    String missingAttribute = null;

    for (int i = 0; i < validAttributes.length; i++) {
        int attrPos;
        if (validAttributes[i].mandatory) {
                attrPos = temp.indexOf(validAttributes[i].name);
        if (attrPos != -1) {
            temp.remove(attrPos);
            valid = true;
        } else {
            valid = false;
            missingAttribute = validAttributes[i].name;
            break;
        }
        }
    }

    // If mandatory attribute is missing then the exception is thrown
    if (!valid)
        err.jspError(start, "jsp.error.mandatory.attribute", typeOfTag,
             missingAttribute);

    // Check to see if there are any more attributes for the specified tag.
        int attrLeftLength = temp.size();
    if (attrLeftLength == 0)
        return;

    // Now check to see if the rest of the attributes are valid too.
    String attribute = null;

    for (int j = 0; j < attrLeftLength; j++) {
        valid = false;
        attribute = (String) temp.elementAt(j);
        for (int i = 0; i < validAttributes.length; i++) {
        if (attribute.equals(validAttributes[i].name)) {
            valid = true;
            break;
        }
        }
        if (!valid)
        err.jspError(start, "jsp.error.invalid.attribute", typeOfTag,
                 attribute);
    }
    // XXX *could* move EL-syntax validation here... (sb)
    }