[rules-dev] Declared types - extension

[Michael Anstis]

There's also a quirk regarding the class resolution:-

Given Person class:-

package com.guvnor.domain;

import java.math.BigDecimal;

public class Person {

    private BigDecimal salary;

    public BigDecimal getSalary() {
        return salary;
    }

    public void setSalary(BigDecimal salary) {
        this.salary = salary;
    }

}


The following compiles OK:-

package com.sample

import com.guvnor.domain.Person

declare Person
end

However the following does not (without explicitly importing
java.math.BigDecimal - which is a field type in Person):-

package com.sample

import com.guvnor.domain.Person
import com.guvnor.domain.Address

declare Person
end

declare Person2 extends Person
    flange : String
end

Error being "Unknown DroolsError class
org.drools.compiler.TypeDeclarationError: Unable to find class 'BigDecimal'
".

With kind regards,

Mike

On 11 July 2011 08:41, Wolfgang Laun <wolfgang.laun at gmail.com> wrote:

> Subsection 5.7.7 discusses 'extends' and describes how it is done for types
> declared in Java.
>
> One finesse is apparently not documented: Java types must be proper
> JavaBeans; otherwise the construction of the accessors will fail. (Try, for
> instance, a property with a getter but no matching setter.)
>
> HTH
> -W
>
>
> On 10 July 2011 22:29, Michael Anstis <michael.anstis at gmail.com> wrote:
>
>> What's the rules around declared types extending another (declared) type?
>>
>> I've been asked to provide for declared type extension in Guvnor (by
>> Prakash) but the Expert user-guide doesn't say it exists at the engine
>> level.
>>
>> I tried "declare MyType extends java.util.ArrayList" and received a
>> parser\compiler error stating "java.util.ArrayList was not a declared type"
>> (or words to that effect) so some form of extension appears possible.
>>
>> Thanks,
>>
>> Mike
>>
>> _______________________________________________
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>> rules-dev at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-dev
>>
>>
>
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