/** Produces an indented XML representation of this object. */
public StringBuffer toXML() {
StringBuffer sb = new StringBuffer(500);
sb.append("<ogc:").append(getOperatorName()).append(">");
sb.append(expr1.toXML());
sb.append(expr2.toXML());
sb.append("</ogc:").append(getOperatorName()).append(">");
return sb;
}
/**
* Calculates the <tt>ComparisonOperation</tt>'s logical value based on the certain property
* values of the given <tt>Feature</tt>. TODO: Improve datatype handling.
*
* @param feature that determines the property values
* @return true, if the <tt>FeatureFilter</tt> evaluates to true, else false
* @throws FilterEvaluationException if the expressions to be compared are of different types
*/
public boolean evaluate(Feature feature) throws FilterEvaluationException {
Object value1 = expr1.evaluate(feature);
Object value2 = expr2.evaluate(feature);
// compare Strings
if (value1 instanceof String && value2 instanceof String) {
switch (getOperatorId()) {
case OperationDefines.PROPERTYISEQUALTO:
{
if (value1 == null || value2 == null) return false;
return value1.equals(value2);
}
case OperationDefines.PROPERTYISLESSTHAN:
case OperationDefines.PROPERTYISGREATERTHAN:
case OperationDefines.PROPERTYISLESSTHANOREQUALTO:
case OperationDefines.PROPERTYISGREATERTHANOREQUALTO:
{
throw new FilterEvaluationException(
"'" + getOperatorName() + "' can not be applied to " + "String values!");
}
default:
{
throw new FilterEvaluationException(
"Unknown comparison operation: '" + getOperatorName() + "'!");
}
}
}
// compare Doubles
else if ((value1 instanceof Number) && (value2 instanceof Number)) {
double d1 = Double.parseDouble(value1.toString());
double d2 = Double.parseDouble(value2.toString());
switch (getOperatorId()) {
case OperationDefines.PROPERTYISEQUALTO:
return d1 == d2;
case OperationDefines.PROPERTYISLESSTHAN:
return d1 < d2;
case OperationDefines.PROPERTYISGREATERTHAN:
return d1 > d2;
case OperationDefines.PROPERTYISLESSTHANOREQUALTO:
return d1 <= d2;
case OperationDefines.PROPERTYISGREATERTHANOREQUALTO:
return d1 >= d2;
default:
{
throw new FilterEvaluationException(
"Unknown comparison operation: '" + getOperatorName() + "'!");
}
}
} else {
// throw new FilterEvaluationException (
// "Can not apply operation '" + getOperatorName () + "' to "
// + "different datatypes!");
return false;
}
}