@Override
public boolean visitDistinct(EJBQLExpression expression) {
// "distinct" is appended via a marker as sometimes a later match on to-many would
// require a DISTINCT insertion.
context.pushMarker(context.makeDistinctMarker(), true);
context.append(" DISTINCT");
context.popMarker();
return true;
}
@Override
public boolean visitFromItem(EJBQLFromItem expression, int finishedChildIndex) {
String id = expression.getId();
if (lastId != null) {
context.append(',');
context.markCurrentPosition(EJBQLJoinAppender.makeJoinTailMarker(lastId));
}
this.lastId = id;
joinAppender.appendTable(new EJBQLTableId(id));
return false;
}
@Override
public boolean visitSelect(EJBQLExpression expression) {
// this ensures that result columns are appeneded only in top-level select, but
// not subselect (as 'visitSelect' is not called on subselect)
context.setAppendingResultColumns(true);
return true;
}
@Override
public boolean visitOuterJoin(EJBQLJoin join) {
joinAppender.appendOuterJoin(
null,
new EJBQLTableId(join.getLeftHandSideId()),
new EJBQLTableId(join.getRightHandSideId()));
context.markCurrentPosition(EJBQLJoinAppender.makeJoinTailMarker(join.getRightHandSideId()));
return false;
}
@Override
public boolean visitFrom(EJBQLExpression expression, int finishedChildIndex) {
if (finishedChildIndex + 1 == expression.getChildrenCount()) {
if (lastId != null) {
context.markCurrentPosition(EJBQLJoinAppender.makeJoinTailMarker(lastId));
}
}
return true;
}
@Override
public boolean visitFrom(EJBQLExpression expression, int finishedChildIndex) {
context.append(" FROM");
context.setAppendingResultColumns(false);
expression.visit(context.getTranslatorFactory().getFromTranslator(context));
context.markCurrentPosition(context.makeWhereMarker());
context.markCurrentPosition(context.makeEntityQualifierMarker());
return false;
}
@Override
public boolean visitInnerJoin(EJBQLJoin join) {
joinAppender.appendInnerJoin(
null,
new EJBQLTableId(join.getLeftHandSideId()),
new EJBQLTableId(join.getRightHandSideId()));
// fix 1341-mark current join position for probable future joins to this join
context.markCurrentPosition(EJBQLJoinAppender.makeJoinTailMarker(join.getRightHandSideId()));
return false;
}
@Override
public boolean visitWhere(EJBQLExpression expression) {
// "WHERE" is appended via a marker as it may have been already appended when an
// entity inheritance qualifier was applied.
context.pushMarker(context.makeWhereMarker(), true);
context.append(" WHERE");
context.popMarker();
if (context.findOrCreateMarkedBuffer(context.makeEntityQualifierMarker()).length() > 0) {
context.append(" AND");
}
expression.visit(context.getTranslatorFactory().getConditionTranslator(context));
return false;
}
public EJBQLFromTranslator(EJBQLTranslationContext context) {
super(true);
this.context = context;
this.joinAppender = context.getTranslatorFactory().getJoinAppender(context);
}
@Override
public boolean visitSelectExpressions(EJBQLExpression expression) {
expression.visit(context.getTranslatorFactory().getSelectColumnsTranslator(context));
return false;
}
@Override
public boolean visitSelectClause(EJBQLExpression expression) {
context.append("SELECT");
context.markCurrentPosition(context.makeDistinctMarker());
return true;
}
@Override
public boolean visitOrderBy(EJBQLExpression expression) {
context.append(" ORDER BY");
expression.visit(context.getTranslatorFactory().getOrderByTranslator(context));
return false;
}
@Override
public boolean visitHaving(EJBQLExpression expression) {
context.append(" HAVING");
expression.visit(context.getTranslatorFactory().getConditionTranslator(context));
return false;
}
@Override
public boolean visitGroupBy(EJBQLExpression expression) {
context.append(" GROUP BY");
expression.visit(context.getTranslatorFactory().getGroupByTranslator(context));
return false;
}
