ICS serialization, plus basic component construction and connection

calendar/base/public/calIICSService.idl

@@ -114,10 +114,15 @@ interface calIIcalComponent : nsISupports
                       [array,size_is(count),retval] out string attendees);
     void setAttendees(in PRUint32 count,
                       [array,size_is(count)] in string attendees);
+
+    AUTF8String serializeToICS();
+
+    void addSubcomponent(in calIIcalComponent comp);
 };
 
 [scriptable,uuid(c788a1dc-0929-4029-9a14-e1bc654eafad)]
 interface calIICSService : nsISupports
 {
     calIIcalComponent parseICS(in AUTF8String serialized);
+    calIIcalComponent createIcalComponent(in PRUint32 kind);
 };

calendar/base/src/calICSService.cpp

@@ -310,6 +310,40 @@ calIcalComponent::SetAttendees(PRUint32 count, const char **attendees)
     return NS_OK;
 }
 
+NS_IMETHODIMP
+calIcalComponent::SerializeToICS(nsACString &serialized)
+{
+    char *icalstr = icalcomponent_as_ical_string(mComponent);
+    if (!icalstr) {
+#ifdef DEBUG
+        fprintf(stderr, "Error serializing: %d (%s)\n",
+                icalerrno, icalerror_strerror(icalerrno));
+#endif
+        return NS_ERROR_FAILURE;
+    }
+
+    serialized.Assign(icalstr);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+calIcalComponent::AddSubcomponent(calIIcalComponent *comp)
+{
+    /* XXX mildly unsafe assumption here.
+     * To fix it, I will:
+     * - check the object's classinfo to find out if I have one of my
+     *   own objects, and if not
+     * - use comp->serializeToICS and reparse to create a copy.
+     *
+     * I should probably also return the new/reused component so that the
+     * caller has something it can poke at all live-like.
+     */
+    calIcalComponent *ical = NS_STATIC_CAST(calIcalComponent *, comp);
+    icalcomponent_add_component(mComponent, ical->mComponent);
+    ical->mParent = this;
+    return NS_OK;
+}
+
 NS_IMPL_ISUPPORTS1(calICSService, calIICSService)
 
 NS_IMETHODIMP
@@ -334,3 +368,20 @@ calICSService::ParseICS(const nsACString& serialized,
     NS_ADDREF(*component = comp);
     return NS_OK;
 }
+
+NS_IMETHODIMP
+calICSService::CreateIcalComponent(PRUint32 kind, calIIcalComponent **comp)
+{
+    icalcomponent *ical = icalcomponent_new((icalcomponent_kind)kind);
+    if (!ical)
+        return NS_ERROR_OUT_OF_MEMORY; // XXX translate
+
+    *comp = new calIcalComponent(ical, nsnull);
+    if (!*comp) {
+        icalcomponent_free(ical);
+        return NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    NS_ADDREF(*comp);
+    return NS_OK;
+}