private void initAliases(SelectExpression[] selectExpressions) {
if (aggregatedSelectExpression == null) {
aliases = new String[selectExpressions.length];
for (int i = 0; i < selectExpressions.length; i++) {
String alias = selectExpressions[i].getAlias();
aliases[i] = alias == null ? Integer.toString(i) : alias;
}
} else {
aliases = aggregatedSelectExpression.getAggregatedAliases();
}
}
/**
* Prepares an explicitly defined select clause.
*
* @param fromClause The from clause linked to this select clause.
* @throws SemanticException indicates a semntic issue with the explicit select clause.
*/
public void initializeExplicitSelectClause(FromClause fromClause) throws SemanticException {
if (prepared) {
throw new IllegalStateException("SelectClause was already prepared!");
}
// explicit = true; // This is an explict Select.
// ArrayList sqlResultTypeList = new ArrayList();
ArrayList queryReturnTypeList = new ArrayList();
// First, collect all of the select expressions.
// NOTE: This must be done *before* invoking setScalarColumnText() because setScalarColumnText()
// changes the AST!!!
SelectExpression[] selectExpressions = collectSelectExpressions();
// we only support parameters in select in the case of INSERT...SELECT statements
if (getParameterPositions().size() > 0
&& getWalker().getStatementType() != HqlSqlTokenTypes.INSERT) {
throw new QueryException(
"Parameters are only supported in SELECT clauses when used as part of a INSERT INTO DML statement");
}
for (int i = 0; i < selectExpressions.length; i++) {
SelectExpression selectExpression = selectExpressions[i];
if (AggregatedSelectExpression.class.isInstance(selectExpression)) {
aggregatedSelectExpression = (AggregatedSelectExpression) selectExpression;
queryReturnTypeList.addAll(aggregatedSelectExpression.getAggregatedSelectionTypeList());
scalarSelect = true;
} else {
// we have no choice but to do this check here
// this is not very elegant but the "right way" would most likely involve a bigger rewrite
// so as to
// treat ParameterNodes in select clauses as SelectExpressions
boolean inSubquery =
selectExpression instanceof QueryNode
&& ((QueryNode) selectExpression).getFromClause().getParentFromClause() != null;
if (getWalker().getStatementType() == HqlSqlTokenTypes.INSERT && inSubquery) {
// we do not support parameters for subqueries in INSERT...SELECT
if (((QueryNode) selectExpression).getSelectClause().getParameterPositions().size() > 0) {
throw new QueryException(
"Use of parameters in subqueries of INSERT INTO DML statements is not supported.");
}
}
Type type = selectExpression.getDataType();
if (type == null) {
throw new IllegalStateException(
"No data type for node: "
+ selectExpression.getClass().getName()
+ " "
+ new ASTPrinter(SqlTokenTypes.class).showAsString((AST) selectExpression, ""));
}
// sqlResultTypeList.add( type );
// If the data type is not an association type, it could not have been in the FROM clause.
if (selectExpression.isScalar()) {
scalarSelect = true;
}
if (isReturnableEntity(selectExpression)) {
fromElementsForLoad.add(selectExpression.getFromElement());
}
// Always add the type to the return type list.
queryReturnTypeList.add(type);
}
}
// init the aliases, after initing the constructornode
initAliases(selectExpressions);
if (!getWalker().isShallowQuery()) {
// add the fetched entities
List fromElements = fromClause.getProjectionList();
ASTAppender appender =
new ASTAppender(getASTFactory(), this); // Get ready to start adding nodes.
int size = fromElements.size();
Iterator iterator = fromElements.iterator();
for (int k = 0; iterator.hasNext(); k++) {
FromElement fromElement = (FromElement) iterator.next();
if (fromElement.isFetch()) {
FromElement origin = null;
if (fromElement.getRealOrigin() == null) {
// work around that crazy issue where the tree contains
// "empty" FromElements (no text); afaict, this is caused
// by FromElementFactory.createCollectionJoin()
if (fromElement.getOrigin() == null) {
throw new QueryException(
"Unable to determine origin of join fetch ["
+ fromElement.getDisplayText()
+ "]");
} else {
origin = fromElement.getOrigin();
}
} else {
origin = fromElement.getRealOrigin();
}
if (!fromElementsForLoad.contains(origin)) {
throw new QueryException(
"query specified join fetching, but the owner "
+ "of the fetched association was not present in the select list "
+ "["
+ fromElement.getDisplayText()
+ "]");
}
Type type = fromElement.getSelectType();
addCollectionFromElement(fromElement);
if (type != null) {
boolean collectionOfElements = fromElement.isCollectionOfValuesOrComponents();
if (!collectionOfElements) {
// Add the type to the list of returned sqlResultTypes.
fromElement.setIncludeSubclasses(true);
fromElementsForLoad.add(fromElement);
// sqlResultTypeList.add( type );
// Generate the select expression.
String text = fromElement.renderIdentifierSelect(size, k);
SelectExpressionImpl generatedExpr =
(SelectExpressionImpl) appender.append(SqlTokenTypes.SELECT_EXPR, text, false);
if (generatedExpr != null) {
generatedExpr.setFromElement(fromElement);
}
}
}
}
}
// generate id select fragment and then property select fragment for
// each expression, just like generateSelectFragments().
renderNonScalarSelects(collectSelectExpressions(), fromClause);
}
if (scalarSelect || getWalker().isShallowQuery()) {
// If there are any scalars (non-entities) selected, render the select column aliases.
renderScalarSelects(selectExpressions, fromClause);
}
finishInitialization(/*sqlResultTypeList,*/ queryReturnTypeList);
}
