protected T createInstanceForResults(
EntityConfig<T, ID> entityConfig,
DatabaseResults results,
Map<String, Integer> columnPositions,
List<PropertyConfig> instancePropertyConfigs,
PropertyConfig[] resultsPropertyConfigs)
throws SQLException {
if (entityConfig.getInheritance() != InheritanceType.JOINED) {
instancePropertyConfigs.addAll(Arrays.asList(resultsPropertyConfigs));
return this.entityConfig.createObject();
} else {
// if(tableInfo.getChildTableInfos().size() == 0) { // class lowest in inheritance
// hierarchy
// return tableInfo.createObject();
// }
JoinedEntityConfig joinedTableInfo =
(JoinedEntityConfig) entityConfig.getInheritanceTopLevelEntityConfig();
String discriminatorColumnName =
joinedTableInfo.getDiscriminatorPropertyConfig().getColumnName();
Integer discriminatorColumnIndex = columnPositions.get(discriminatorColumnName);
if (discriminatorColumnIndex == null) {
discriminatorColumnIndex = results.findColumn(discriminatorColumnName);
if (discriminatorColumnIndex >= 0)
columnPositions.put(discriminatorColumnName, discriminatorColumnIndex);
else {
discriminatorColumnIndex = null;
// TODO: is this correct?
return entityConfig.createObject();
}
}
String discriminatorValue =
results.getString(discriminatorColumnIndex); // TODO: check for Discriminator type first
EntityConfig resultEntityEntityConfig =
joinedTableInfo.getEntityForDiscriminatorValue(discriminatorValue);
instancePropertyConfigs.addAll(joinedTableInfo.getSubClassFieldTypes(discriminatorValue));
return (T) resultEntityEntityConfig.createObject();
}
}
public T moveRelative(int offset) throws SQLException {
if (closed) {
return null;
}
first = false;
if (results.moveRelative(offset)) {
return getCurrent();
} else {
return null;
}
}
public T previous() throws SQLException {
if (closed) {
return null;
}
first = false;
if (results.previous()) {
return getCurrent();
} else {
return null;
}
}
/**
* Returns whether or not there are any remaining objects in the table. Can be called before
* next().
*
* @throws SQLException If there was a problem getting more results via SQL.
*/
public boolean hasNextThrow() throws SQLException {
if (closed) {
return false;
}
if (alreadyMoved) {
// we do this so multiple hasNext() calls can be made, result would be true or closed is true
return true;
}
boolean result;
if (first) {
first = false;
result = results.first();
} else {
result = results.next();
}
if (!result) {
close();
}
alreadyMoved = true;
return result;
}
public T nextThrow() throws SQLException {
if (closed) {
return null;
}
if (!alreadyMoved) {
boolean hasResult;
if (first) {
first = false;
hasResult = results.first();
} else {
hasResult = results.next();
}
// move forward
if (!hasResult) {
first = false;
return null;
}
}
first = false;
return getCurrent();
}
@Override
public Object resultToSqlArg(FieldType fieldType, DatabaseResults results, int columnPos)
throws SQLException {
return (Long) results.getLong(columnPos);
}
public T mapRow(DatabaseResults results) throws SQLException {
Map<String, Integer> colPosMap;
if (columnPositions == null) {
colPosMap = new HashMap<String, Integer>();
} else {
colPosMap = columnPositions;
}
ObjectCache objectCache = results.getObjectCache();
Object id = null;
if (objectCache != null) {
id = idField.resultToJava(results, colPosMap);
T cachedInstance = objectCache.get(entityConfig, id);
if (cachedInstance != null) {
// if we have a cached instance for this id then return it
return cachedInstance;
}
}
// create our instance
List<PropertyConfig> instancePropertyConfigs = new ArrayList<>();
T instance =
createInstanceForResults(
entityConfig, results, colPosMap, instancePropertyConfigs, resultsPropertyConfigs);
if (objectCache != null && id != null) {
// why not adding instance already here to cache? Avoids multiple retrievals on (deep)
// recursive dependencies on its fields
objectCache.put(
(Class<T>) instance.getClass(),
id,
instance); // don't use clazz variable here as for tables with inheritance this might be
// wrong (it might only be the parent class)
}
// populate its fields
Boolean foreignCollections = false;
for (PropertyConfig propertyConfig : instancePropertyConfigs) {
if (propertyConfig.isForeignCollection()) {
foreignCollections = true;
} else {
Object val = propertyConfig.resultToJava(results, colPosMap);
/*
* This is pretty subtle. We introduced multiple foreign fields to the same type which use the {@link
* ForeignCollectionField} foreignColumnName field. The bug that was created was that all the fields
* were then set with the parent class. Only the fields that have a matching id value should be set to
* the parent. We had to add the val.equals logic.
*/
if (val != null
&& parent != null
&& propertyConfig.getType() == parent.getClass()
&& val.equals(parentId)) {
propertyConfig.assignField(instance, parent, true, objectCache);
} else {
propertyConfig.assignField(instance, val, false, objectCache);
}
if (propertyConfig == idField) {
id = val;
}
}
}
// if we have a cache and we have an id then add it to the cache
// if (objectCache != null && id != null) { // for ManyToMany collections it is of great
// importance that instance will be cached already here, before ForeignCollections will be built
// objectCache.put(clazz, id, instance);
// }
if (foreignCollections) {
// go back and initialize any foreign collections
for (PropertyConfig propertyConfig : instancePropertyConfigs) {
if (propertyConfig.isForeignCollection()) {
Collection collection =
propertyConfig.buildForeignCollection(
instance, id); // cda: implement against interfaces, not implementations
if (collection != null) {
propertyConfig.assignField(instance, collection, false, objectCache);
}
}
}
}
if (columnPositions == null) {
columnPositions = colPosMap;
}
entityConfig.invokePostLoadLifeCycleMethod(instance);
return instance;
}