public  void addAttribute(String name,
    String type,
    String value) 
{
        ListNode node = new ListNode(name, type, value);
        if (length == 0) {
            head = node;
        }
        else {
            tail.next = node;
        }
        tail = node;
        length++;
}

Adds an attribute.

 public int getLength() 
{
        return length;
}

Returns the number of attributes.

 public String getName(int index) 
{
        ListNode node = getNodeAt(index);
        return (node != null) ? node.name : null;
}

Returns the attribute name by index.

 public String getType(int index) 
{
        ListNode node = getNodeAt(index);
        return (node != null) ? node.type : null;
}

Returns the attribute type by index.

 public String getType(String name) 
{
        ListNode node = getNodeAt(name);
        return (node != null) ? node.type : null;
}

Returns the attribute type by name.

 public String getValue(int index) 
{
        ListNode node = getNodeAt(index);
        return (node != null) ? node.value : null;
}

Returns the attribute value by index.

 public String getValue(String name) 
{
        ListNode node = getNodeAt(name);
        return (node != null) ? node.value : null;
}

Returns the attribute value by name.

 public  void insertAttributeAt(int index,
    String name,
    String type,
    String value) 
{
        // if list is empty, add attribute
        if (length == 0 || index  >= length) {
            addAttribute(name, type, value);
            return;
        }
        // insert at beginning of list
        ListNode node = new ListNode(name, type, value);
        if (index <  1) {
            node.next = head;
            head = node;
        }
        else {
            ListNode prev = getNodeAt(index - 1);
            node.next = prev.next;
            prev.next = node;
        }
        length++;
}

Inserts an attribute.

 public  void removeAttributeAt(int index) 
{
        if (length == 0) {
            return;
        }
        if (index == 0) {
            head = head.next;
            if (head == null) {
                tail = null;
            }
            length--;
        }
        else {
            ListNode prev = getNodeAt(index - 1);
            ListNode node = getNodeAt(index);
            if (node != null) {
                prev.next = node.next;
                if (node == tail) {
                    tail = prev;
                }
                length--;
            }
        }
}

Removes an attribute.

 public String toString() 
{
        StringBuffer str = new StringBuffer();
        str.append('[");
        str.append("len=");
        str.append(length);
        str.append(", {");
        for (ListNode place = head; place != null; place = place.next) {
            str.append(place.name);
            if (place.next != null) {
                str.append(", ");
            }
        }
        str.append("}]");
        return str.toString();
}

Returns a string representation of this object.