code: public boolean hasAttribute(String name, String value)
    {
      Params.notNullOrEmpty(name, "Attribute name");
      Params.notNullOrEmpty(value, "Attribute value");
      return value.equals(attributes.get(name));
    }
docs: Test if configuration object has an attribute with requested name and value.
  
  @param name name of the attribute to search for,
  @param value attribute value.
  @return true if configuration object has an attribute with requested name and value.
  @throws IllegalArgumentException if <code>name</code> argument is null or empty.
  @throws IllegalArgumentException if <code>value</code> argument is null or empty.