private Prop findRelProperty(Class<?> fromCls, String rel, Class<?> toCls) {
Object entity = !fromCls.isInterface() ? data.constructor.create(fromCls) : null;
for (Prop prop : Beany.propertiesOf(fromCls).select(data.relPropSelector)) {
String relName = null;
if (!fromCls.isInterface()) {
Object value = prop.getRaw(entity);
if (hasEntityLinks(value)) {
EntityLinks links = entityLinks(value);
relName = links.relationName();
}
} else {
Rel relation = prop.getAnnotation(Rel.class);
if (relation != null) {
relName = relation.value();
}
}
if (relName != null && relName.equals(rel)) {
if (prop.getRawTypeArg(0).equals(toCls)) {
return prop;
}
}
}
Log.warn(
"Didn't find inverse relation property!", "relation", rel, "from", fromCls, "to", toCls);
return null;
}
private void relUnlink(String relation, Prop srcProp, long fromId, Prop destProp, long toId) {
if (srcProp != null && destProp != null) {
Object from = get_(fromId, true);
EntityLinks srcRels = entityLinks(srcProp.getRaw(from));
srcRels.removeRelTo(toId);
update_(fromId, from, false, false);
}
}
private void deleteRelsFor(Object entity) {
for (Prop prop : Beany.propertiesOf(entity).select(data.relPropSelector)) {
Object value = prop.getRaw(entity);
if (hasEntityLinks(value)) {
EntityLinks links = entityLinks(value);
long fromId = links.fromId();
propageteRelChanges(entity, prop, links, fromId, null, links.allRelIds());
}
}
}
private void propageteRelChanges(
Object entity,
Prop prop,
EntityLinks links,
long fromId,
Collection<Long> addToIds,
Collection<Long> delToIds) {
String rel = links.relationName();
boolean inverse = rel.startsWith("^");
if (inverse) {
rel = rel.substring(1);
}
RelPair relPair = getRelPair(entity, prop, rel, inverse);
if (addToIds != null) {
for (long toId : addToIds) {
if (!inverse) {
relLink(rel, relPair.destProp, toId, relPair.srcProp, fromId);
} else {
relLink(rel, relPair.srcProp, toId, relPair.destProp, fromId);
}
}
}
if (delToIds != null) {
for (long toId : delToIds) {
if (!inverse) {
relUnlink(rel, relPair.destProp, toId, relPair.srcProp, fromId);
} else {
relUnlink(rel, relPair.srcProp, toId, relPair.destProp, fromId);
}
}
}
}
