I'm getting an exception when I try to invoke andExp() on a Scalar expression:
Expression e=new ASTScalar(Boolean.TRUE);
e=e.andExp(ExpressionFactory.matchExp(propName + (i+1), t));
[v.1.2-dev July 19 2006] And: invalid child - Scalar
org.objectstyle.cayenne.exp.parser.AggregateConditionNode.jjtAddChild(AggregateConditionNode.java:125)
org.objectstyle.cayenne.exp.parser.SimpleNode.setOperand(SimpleNode.java:187)
org.objectstyle.cayenne.exp.Expression.joinExp(Expression.java:395)
org.objectstyle.cayenne.exp.Expression.andExp(Expression.java:405)
Some fiendishly clever code to work around horrid database structures
for implementing trees:
/* returns the non-recursive list of children based upon the old
scheme for trees */
public Expression getChildrenQualifierGeneric(
/* Name of property without the number suffix, e.g.
"treataspecVc" */
String propName,
/* total number of levels, for e.g. treataspecVc==5 */
int totLevels)
{
try
{
OgnlContext context = new OgnlContext();
Expression e=new ASTScalar(Boolean.TRUE);
for (int i=0; i<totLevels; i++)
{
Object propObj;
propObj = Ognl.parseExpression(propName +
(i+1));
String t=(String) Ognl.getValue(propObj,
context, this);
if (t==null)
{
e=e.andExp(ExpressionFactory.noMatchExp(propName + (i+1), null));
e=e.andExp(ExpressionFactory.matchExp(propName + (i+2), null));
return e;
} else if ((i+1)<totLevels)
{
e=e.andExp(ExpressionFactory.matchExp(propName + (i+1), t));
}
}
return new ASTScalar(Boolean.FALSE);
} catch (OgnlException e)
{
throw new RuntimeException(e);
}
}
--
Øyvind Harboe
http://www.zylin.com
