cayenne-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Øyvind Harboe" <oyvind.har...@zylin.com>
Subject Is andExp supported on Scalar booleans?
Date Wed, 16 Aug 2006 20:47:23 GMT
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

Mime
View raw message