private TPreparedExpression compare(
TPreparedExpression left, ComparisonCondition comparison, TPreparedExpression right) {
TKeyComparable keyComparable = comparison.getKeyComparable();
if (keyComparable != null) {
return new TKeyComparisonPreparation(
left, comparison.getOperation(), right, comparison.getKeyComparable());
} else {
return new TComparisonExpression(left, comparison.getOperation(), right);
}
}
private TPreparedExpression in(
TPreparedExpression lhs, List<TPreparedExpression> rhs, InListCondition inList) {
ComparisonCondition comparison = inList.getComparison();
if (comparison == null) return TInExpression.prepare(lhs, rhs, queryContext);
else
return TInExpression.prepare(
lhs, rhs, comparison.getRight().getType(), comparison.getKeyComparable(), queryContext);
}
public TPreparedExpression assembleExpression(
ExpressionNode node,
ColumnExpressionContext columnContext,
SubqueryOperatorAssembler subqueryAssembler) {
TPreparedExpression possiblyLiteral = tryLiteral(node);
if (possiblyLiteral != null) return possiblyLiteral;
if (node instanceof ConstantExpression) return literal(((ConstantExpression) node));
else if (node instanceof ColumnExpression)
return assembleColumnExpression((ColumnExpression) node, columnContext);
else if (node instanceof ParameterExpression) return variable((ParameterExpression) node);
else if (node instanceof BooleanOperationExpression) {
BooleanOperationExpression bexpr = (BooleanOperationExpression) node;
return assembleFunction(
bexpr,
bexpr.getOperation().getFunctionName(),
Arrays.<ExpressionNode>asList(bexpr.getLeft(), bexpr.getRight()),
columnContext,
subqueryAssembler);
} else if (node instanceof CastExpression)
return assembleCastExpression((CastExpression) node, columnContext, subqueryAssembler);
else if (node instanceof ComparisonCondition) {
ComparisonCondition cond = (ComparisonCondition) node;
TPreparedExpression left =
assembleExpression(cond.getLeft(), columnContext, subqueryAssembler);
TPreparedExpression right =
assembleExpression(cond.getRight(), columnContext, subqueryAssembler);
// never use a collator if we have a KeyComparable
AkCollator collator = (cond.getKeyComparable() == null) ? collator(cond, left, right) : null;
if (collator != null) return collate(left, cond.getOperation(), right, collator);
else return compare(left, cond, right);
} else if (node instanceof FunctionExpression) {
FunctionExpression funcNode = (FunctionExpression) node;
return assembleFunction(
funcNode,
funcNode.getFunction(),
funcNode.getOperands(),
columnContext,
subqueryAssembler);
} else if (node instanceof IfElseExpression) {
IfElseExpression ifElse = (IfElseExpression) node;
return assembleFunction(
ifElse,
"if",
Arrays.asList(
ifElse.getTestCondition(), ifElse.getThenExpression(), ifElse.getElseExpression()),
columnContext,
subqueryAssembler);
} else if (node instanceof InListCondition) {
InListCondition inList = (InListCondition) node;
TPreparedExpression lhs =
assembleExpression(inList.getOperand(), columnContext, subqueryAssembler);
List<TPreparedExpression> rhs =
assembleExpressions(inList.getExpressions(), columnContext, subqueryAssembler);
return in(lhs, rhs, inList);
} else if (node instanceof RoutineExpression) {
RoutineExpression routineNode = (RoutineExpression) node;
return assembleRoutine(
routineNode,
routineNode.getRoutine(),
routineNode.getOperands(),
columnContext,
subqueryAssembler);
} else if (node instanceof SubqueryExpression)
return subqueryAssembler.assembleSubqueryExpression((SubqueryExpression) node);
else if (node instanceof AggregateFunctionExpression)
throw new UnsupportedSQLException("Aggregate used as regular function", node.getSQLsource());
else if (node instanceof ColumnDefaultExpression)
return assembleColumnDefault(((ColumnDefaultExpression) node).getColumn(), null);
else if (node instanceof IsNullIndexKey) return new TNullExpression(node.getType());
else throw new UnsupportedSQLException("Unknown expression", node.getSQLsource());
}