predicate returning TRUE if there's only one value for the attribute.

predicate returning TRUE if there's only one value for the attribute.

2004-02-25  Chris Toshok  <toshok@ximian.com>

	* libebook/e-vcard.c (e_vcard_attribute_is_single_valued):
	predicate returning TRUE if there's only one value for the
	attribute.
	(e_vcard_attribute_get_value): return the first value in the list,
	if there is one.  also, warn if called on a multi-valued
	attribute.
	(e_vcard_attribute_get_value_decoded): same, but return a GString.
	(e_vcard_attribute_has_type): predicate to check for TYPE=@typestr
	in the parameter list for an attribute.

	* libebook/e-vcard.h: add prototypes for
	e_vcard_attribute_is_single_valued and
	e_vcard_attribute_get_value{_decoded}.  Also, add
	e_vcard_attribute_has_type.

	* libebook/e-contact.h: add prototypes for
	e_contact_{get,set}_attributes, and e_contact_vcard_attribute.

	* libebook/e-contact.c (e_contact_vcard_attribute): new function,
	return the vcard attribute for a given EContactField id.
	(e_contact_get_attributes): get a GList* of EVCardAttributes for
	the given EContactField.  This allows you to get at the parameters
	to the attribute, which you can't get with e_contact_get.
	(e_contact_set_attributes): an analogous setter for
	e_contact_get_attributes.