public boolean expand(Writer output, Serializable object, RuleOptions options) throws IOException, RuleException { boolean expanded = false; boolean prefixPrinted = false; boolean atLeastOneChildPrinted = false; if (object == null) { if (Debug.isDebug()) { throw new NullPointerException(); // disclose programming error // in debug.. } else { return false; } } // end if if (!(object instanceof DbObject)) { return false; } // end if DbObject dbObject = (DbObject) object; MetaRelationship metaRelation = getMetaRelation(dbObject); MetaClass childrenMetaClass = getChildrenMetaClass(); try { // get metaRelation from its string representation if (metaRelation == null) metaRelation = (MetaRelationship) getMetaField(dbObject, sConnector); boolean state[] = {prefixPrinted, atLeastOneChildPrinted}; if (metaRelation instanceof MetaRelation1) { MetaRelation1 metaRelation1 = (MetaRelation1) metaRelation; expanded |= expandMetaRelation1(output, dbObject, metaRelation1, state, childrenMetaClass, options); } else if (metaRelation instanceof MetaRelationN) { expanded |= expandMetaRelationN(output, dbObject, metaRelation, state, childrenMetaClass, options); } else if (metaRelation instanceof MetaChoice) { MetaChoice choice = (MetaChoice) metaRelation; expanded |= expandMetaChoice(output, dbObject, choice, state, childrenMetaClass, options); } else { // TODO: throw 'meta-relationship not supported' } super.terminate(output, options); } catch (DbException ex) { String msg = ex.getMessage(); throw new RuleException(msg); } catch (RuntimeException ex) { String conn = m_connector.getGUIName(); String objectKind = dbObject.getMetaClass().getGUIName(); String msg = InvalidConnectorRuleException.buildMessage(m_ruleName, conn, objectKind); throw new InvalidConnectorRuleException(msg); } return expanded; }