public Expression GetExpression(ICriteriaLeaf leaf)
{
var type = _typeRegistry.Lookup(leaf);
var typedValue = Converter.NullableSafeChangeType(leaf.Value, type.PropertyType);
var accessorExpression = type.AccessorExpression;
return Expression.Equal(accessorExpression, Expression.Constant(typedValue, type.PropertyType));
}
public Expression GetExpression(ICriteriaLeaf leaf)
{
var type = _typeRegistry.Lookup(leaf);
var compareType = _typeRegistry.Lookup(String.Format("{0}", leaf.Value));
var accessorExpression = type.AccessorExpression;
var outputExpression = compareType.AccessorExpression;
return Expression.Equal(accessorExpression, outputExpression);
}
public Expression GetExpression(ICriteriaLeaf leaf)
{
ICriteriaLeafExpressionStrategy strategy;
if(_criteriaLeafExpressionStrategies.TryGetValue(leaf.Operator, out strategy) == false)
{
throw new ArgumentException(String.Format("No CriteriaLeafExpressionStrategy for operator type {0}", leaf.Operator));
}
var result = strategy.GetExpression(leaf);
return result;
}
public Expression GetExpression(ICriteriaLeaf leaf)
{
var type = _typeRegistry.Lookup(leaf);
var itemType = type.PropertyType;
if((itemType != typeof(bool)) && (itemType != typeof(bool?)))
{
throw new ArgumentException(String.Format("Cannot use the IsTrue operator with type '{0}'.", itemType));
}
return type.AccessorExpression;
}
public Expression GetExpression(ICriteriaLeaf leaf)
{
var type = _typeRegistry.Lookup(leaf);
if(type.PropertyType != typeof(string))
{
throw new ArgumentException(String.Format("Operator {0} is not defined for non-string properties.", leaf.Operator));
}
var accessorExpression = type.AccessorExpression;
var x = Convert.ChangeType(leaf.Value, type.PropertyType);
return Expression.Not(Expression.Call(accessorExpression, "EndsWith", new Type[0], new Expression[] { Expression.Constant(x, type.PropertyType) }));
}
public Expression GetExpression(ICriteriaLeaf leaf)
{
Expression result;
var type = _typeRegistry.Lookup(leaf);
var accessorExpression = type.AccessorExpression;
var doesNotEqualNullExpression = Expression.NotEqual(accessorExpression, Expression.Constant(null));
if (typeof(string).IsAssignableFrom(type.PropertyType))
{
var doesNotEqualEmptyStringExpression = Expression.NotEqual(accessorExpression, Expression.Constant(String.Empty, type.PropertyType));
result = Expression.AndAlso(doesNotEqualNullExpression, doesNotEqualEmptyStringExpression);
}
else
{
result = doesNotEqualNullExpression;
}
return result;
}
private Expression BuildLeafExpression(ICriteriaLeaf leaf)
{
var result = _leafExpressionStrategy.GetExpression(leaf);
return result;
}
