[rules-users] Problem in using genrics with drools4.0.1.
HI ALL,
I am using drool 4.0.1 in my project.
I am facing problem in using generics feature of jdk1.5.
My objective is to perform validation on the basis of data type of variable.
for storing values of variable i have one Attribute Class it contains getter
setter for values of attribute and attributeId which is a string but value
of attribute is of deferent type so i am thinking to use generics here.
public class AttributeT {
public String qualifiedName;
public T newValue;
public T oldValue;
public String getQualifiedName() {
return qualifiedName;
}
public void setQualifiedName(String qualifiedName) {
this.qualifiedName = qualifiedName;
}
public T getNewValue() {
return (T)newValue;
}
public void setNewValue(T newValue) {
this.newValue = newValue;
}
public T getOldValue() {
return oldValue;
}
public void setOldValue(T oldValue) {
this.oldValue = oldValue;
}
}
my rule for date comparison looks like:
//Date Comparison.
rule W250.1 DateComparison
when
$dto : DataProvider()
Attribute(newValue 29-Oct-2007) from $dto.getValue(W250.1)
then
System.out.println (Error in Date check \t);
end
DataProvider class it is responsible to give instance of attribute
corresponding to attributeId:
public class DataProvider {
HashMapString,Attribute fieldMap=new HashMapString, Attribute();
public DataProvider() {
populateMap();
}
public Attribute getValue(String qualifiedName){
Attribute attribute = fieldMap.get(qualifiedName);
return attribute;
}
public void populateMap(){
AttributeDate attribute = new AttributeDate();
SimpleDateFormat format = new SimpleDateFormat(dd-MMM-);
Date date;
try {
date = format.parse(27-Oct-2007);
attribute.setQualifiedName(W250.1);
attribute.setOldValue(date);
attribute.setNewValue(date);
fieldMap.put(attribute.getQualifiedName(),attribute);
}
catch (ParseException e) {
e.printStackTrace();
}
}
}
in this case i am getting exception:
Exception in thread main java.lang.ClassCastException: java.lang.String
when i am not using generics this rule is working fine.
but in this case how should i perform validation depending upon data type of
attribute.
can you please help me in solving this problem.
Thanks,
Gaurav Joshi
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[rules-users] Problem in using or operator with values in map.
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[rules-users] how to perform some task when rule fails.
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[rules-users] probliem in using in and not in operator in drool file.
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Re: [rules-users] Usage of Drools in a RCP project
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[rules-users] how to generate rool.drl file from regular expression in excel sheet.
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