/* Part of XPCE --- The SWI-Prolog GUI toolkit Author: Jan Wielemaker and Anjo Anjewierden E-mail: jan@swi.psy.uva.nl WWW: http://www.swi.psy.uva.nl/projects/xpce/ Copyright (c) 1985-2002, University of Amsterdam All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include static status forwardsIdentity(Identity id, Any from, Any to); static status initialiseIdentity(Identity id, Name from, Name to) { assign(id, from, from); assign(id, to, isDefault(to) ? from : to); succeed; } static status createIdentity(Identity id, Any from, Any to) { if (isNil(from) || isNil(to)) succeed; return forwardsIdentity(id, from, to); } static status forwardsIdentity(Identity id, Any from, Any to) { Any value; status rval; TRY(value = get(from, id->from, EAV)); rval = send(to, id->to, value, EAV); if ( isObject(value) ) doneObject(value); return rval; } static status backwardsIdentity(Identity id, Any from, Any to) { Any value; status rval; TRY(value = get(to, id->to, EAV)); rval = send(from, id->from, value, EAV); if ( isObject(value) ) doneObject(value); return rval; } /******************************* * CLASS DECLARATION * *******************************/ /* Type declarations */ static char *T_create[] = { "from=object*", "to=object*" }; static char *T_fromAobject_toAobject[] = { "from=object", "to=object" }; static char *T_initialise[] = { "selector1=name", "selector2=[name]" }; /* Instance Variables */ static vardecl var_identity[] = { IV(NAME_from, "selector1=name", IV_BOTH, NAME_selector, "Attribute at the `From' side"), IV(NAME_to, "selector2=name", IV_BOTH, NAME_selector, "Attribute at the `To' side") }; /* Send Methods */ static senddecl send_identity[] = { SM(NAME_backwards, 2, T_fromAobject_toAobject, backwardsIdentity, DEFAULT, "Update after `from' object has changed"), SM(NAME_create, 2, T_create, createIdentity, DEFAULT, "Update after instantiation"), SM(NAME_forwards, 2, T_fromAobject_toAobject, forwardsIdentity, DEFAULT, "Update after `to' object has changed"), SM(NAME_initialise, 2, T_initialise, initialiseIdentity, DEFAULT, "Create from attribute names") }; /* Get Methods */ #define get_identity NULL /* static getdecl get_identity[] = { }; */ /* Resources */ #define rc_identity NULL /* static classvardecl rc_identity[] = { }; */ /* Class Declaration */ static Name identity_termnames[] = { NAME_from, NAME_to }; ClassDecl(identity_decls, var_identity, send_identity, get_identity, rc_identity, 2, identity_termnames, "$Rev$"); status makeClassIdentity(Class class) { return declareClass(class, &identity_decls); }