@Override
public Iterator<CayenneMapEntry> resolvePathComponents(Expression pathExp)
throws ExpressionException {
// resolve DB_PATH if we can
if (pathExp.getType() == Expression.DB_PATH) {
if (getDbEntity() == null) {
throw new ExpressionException(
"Can't resolve DB_PATH '" + pathExp + "', DbEntity is not set.");
}
return getDbEntity().resolvePathComponents(pathExp);
}
if (pathExp.getType() == Expression.OBJ_PATH) {
return new PathIterator((String) pathExp.getOperand(0));
}
throw new ExpressionException(
"Invalid expression type: '" + pathExp.expName() + "', OBJ_PATH is expected.");
}
/**
* Returns an Iterable instance over expression path components based on this entity.
*
* @since 3.0
*/
@Override
@SuppressWarnings("unchecked")
public Iterable<PathComponent<ObjAttribute, ObjRelationship>> resolvePath(
final Expression pathExp, final Map aliasMap) {
if (pathExp.getType() == Expression.OBJ_PATH) {
return new Iterable<PathComponent<ObjAttribute, ObjRelationship>>() {
public Iterator iterator() {
return new PathComponentIterator(
ObjEntity.this, (String) pathExp.getOperand(0), aliasMap);
}
};
}
throw new ExpressionException(
"Invalid expression type: '" + pathExp.expName() + "', OBJ_PATH is expected.");
}
public Object transform(Object input) {
if (!(input instanceof Expression)) {
return input;
}
Expression expression = (Expression) input;
if (expression.getType() != Expression.OBJ_PATH) {
return input;
}
// convert obj_path to db_path
String converted = toDbPath(createPathIterator((String) expression.getOperand(0)));
Expression exp = ExpressionFactory.expressionOfType(Expression.DB_PATH);
exp.setOperand(0, converted);
return exp;
}