/**
* Returns the CollectionHandler associated with the given collection, or null if no such handler
* exists.
*
* @param clazz the Class to check
* @return the CollectionHandler for the associated type.
*/
public CollectionHandler getCollectionHandler(final Class clazz) {
CollectionHandler handler = null;
try {
handler = CollectionHandlers.getHandler(clazz);
} catch (MappingException mx) {
// -- Not a collection, or no handler exists, return null.
}
return handler;
} // -- getCollectionHandler
protected FieldDescriptorImpl createFieldDesc(final Class javaClass, final FieldMapping fieldMap)
throws MappingException {
// If not an SQL field, return a stock field descriptor.
Sql sql = fieldMap.getSql();
if (sql == null) {
return super.createFieldDesc(javaClass, fieldMap);
}
String fieldName = fieldMap.getName();
// If the field type is supplied, grab it and use it to locate the
// field/accessor.
Class fieldType = null;
if (fieldMap.getType() != null) {
fieldType = resolveType(fieldMap.getType());
}
// If the field is declared as a collection, grab the collection type as
// well and use it to locate the field/accessor.
CollectionHandler colHandler = null;
boolean isLazy = fieldMap.getLazy();
if (fieldMap.getCollection() != null) {
Class colType = CollectionHandlers.getCollectionType(fieldMap.getCollection().toString());
colHandler = CollectionHandlers.getHandler(colType);
if (colType.getName().equals("java.util.Iterator") && isLazy) {
String err = "Lazy loading not supported for collection type 'iterator'";
throw new MappingException(err);
}
if (colType.getName().equals("java.util.Enumeration") && isLazy) {
String err = "Lazy loading not supported for collection type 'enumerate'";
throw new MappingException(err);
}
}
TypeInfo typeInfo = getTypeInfo(fieldType, colHandler, fieldMap);
ExtendedFieldHandler exfHandler = null;
FieldHandler handler = null;
// -- check for user supplied FieldHandler
if (fieldMap.getHandler() != null) {
Class handlerClass = resolveType(fieldMap.getHandler());
if (!FieldHandler.class.isAssignableFrom(handlerClass)) {
String err =
"The class '"
+ fieldMap.getHandler()
+ "' must implement "
+ FieldHandler.class.getName();
throw new MappingException(err);
}
// -- get default constructor to invoke. We can't use the
// -- newInstance method unfortunately becaue FieldHandler
// -- overloads this method
Constructor constructor = null;
try {
constructor = handlerClass.getConstructor(new Class[0]);
handler = (FieldHandler) constructor.newInstance(new Object[0]);
} catch (Exception except) {
String err =
"The class '" + handlerClass.getName() + "' must have a default public constructor.";
throw new MappingException(err);
}
// -- ExtendedFieldHandler?
if (handler instanceof ExtendedFieldHandler) {
exfHandler = (ExtendedFieldHandler) handler;
}
// -- Fix for Castor JDO from Steve Vaughan, Castor JDO
// -- requires FieldHandlerImpl or a ClassCastException
// -- will be thrown... [KV 20030131 - also make sure this new handler
// -- doesn't use it's own CollectionHandler otherwise
// -- it'll cause unwanted calls to the getValue method during
// -- unmarshalling]
colHandler = typeInfo.getCollectionHandler();
typeInfo.setCollectionHandler(null);
handler = new FieldHandlerImpl(handler, typeInfo);
typeInfo.setCollectionHandler(colHandler);
// -- End Castor JDO fix
}
boolean generalized = (exfHandler instanceof GeneralizedFieldHandler);
// -- if generalized we need to change the fieldType to whatever
// -- is specified in the GeneralizedFieldHandler so that the
// -- correct getter/setter methods can be found
FieldHandler custom = handler;
if (generalized) {
fieldType = ((GeneralizedFieldHandler) exfHandler).getFieldType();
}
if (generalized || (handler == null)) {
// -- create TypeInfoRef to get new TypeInfo from call
// -- to createFieldHandler
TypeInfoReference typeInfoRef = new TypeInfoReference();
typeInfoRef.typeInfo = typeInfo;
handler = createFieldHandler(javaClass, fieldType, fieldMap, typeInfoRef);
if (custom != null) {
((GeneralizedFieldHandler) exfHandler).setFieldHandler(handler);
handler = custom;
} else {
typeInfo = typeInfoRef.typeInfo;
}
}
String[] sqlName = sql.getName();
String[] sqlTypes = getSqlTypes(fieldMap);
int[] sqlTypeNum;
if (sqlTypes.length > 0) {
sqlTypeNum = new int[sqlTypes.length];
for (int i = 0; i < sqlTypes.length; i++) {
String sqlTypeString = definition2type(sqlTypes[i]);
Class sqlType = SQLTypeInfos.sqlTypeName2javaType(sqlTypeString);
if (_factory != null) {
sqlType = _factory.adjustSqlType(sqlType);
}
sqlTypeNum[i] = SQLTypeInfos.javaType2sqlTypeNum(sqlType);
}
} else {
Class sqlType = typeInfo.getFieldType();
if (_factory != null) {
sqlType = _factory.adjustSqlType(sqlType);
}
sqlTypeNum = new int[] {SQLTypeInfos.javaType2sqlTypeNum(sqlType)};
}
// create FieldDescriptor(Impl) instance, and apply JDO nature
FieldDescriptorImpl fieldDescriptor =
new FieldDescriptorImpl(fieldName, typeInfo, handler, fieldMap.getTransient());
fieldDescriptor.addNature(FieldDescriptorJDONature.class.getName());
fieldDescriptor.setRequired(fieldMap.getRequired());
// If we're using an ExtendedFieldHandler we need to set the FieldDescriptor
if (exfHandler != null) {
((FieldHandlerFriend) exfHandler).setFieldDescriptor(fieldDescriptor);
}
// if SQL mapping declares transient
// TODO: cross-check that this should be implemented like this
if (sql.getTransient()) {
fieldDescriptor.setTransient(true);
}
// set collection type as specified in mapping file
fieldDescriptor.setCollection(fieldMap.getCollection());
fieldDescriptor.setComparator(fieldMap.getComparator());
fieldDescriptor.setCreateMethod(fieldMap.getCreateMethod());
fieldDescriptor.setGetMethod(fieldMap.getGetMethod());
fieldDescriptor.setSetMethod(fieldMap.getSetMethod());
fieldDescriptor.setDirect(fieldMap.getDirect());
// extract values for 'laziness' from field mapping
fieldDescriptor.setLazy(isLazy);
FieldDescriptorJDONature fieldJdoNature = new FieldDescriptorJDONature(fieldDescriptor);
fieldJdoNature.setTypeConvertor(typeInfo.getConvertorFrom());
if (sqlName.length > 0) {
fieldJdoNature.setSQLName(sqlName);
}
fieldJdoNature.setSQLType(sqlTypeNum);
fieldJdoNature.setManyTable(sql.getManyTable());
if (sql.getManyKey().length > 0) {
fieldJdoNature.setManyKey(sql.getManyKey());
}
fieldJdoNature.setDirtyCheck(!SqlDirtyType.IGNORE.equals(sql.getDirty()));
fieldJdoNature.setReadOnly(sql.getReadOnly());
fieldJdoNature.setCascading(sql.getCascading());
fieldJdoNature.setTransient(sql.getTransient());
return fieldDescriptor;
}
/**
* Returns true if the given Class is a considered a collection by the marshalling framework.
*
* @param clazz the Class to check
* @return true if the given Class is considered a collection. TODO: joachim: this code exists
* somewhere else too!!
*/
public static boolean isCollection(final Class clazz) {
return CollectionHandlers.hasHandler(clazz);
} // -- isCollection