How do I match a property of a property of a Java Bean
in a Jess rule and bind it to a variable? Does Jess
support nested properties?
I have two Java Beans Trade and Security:
public class Trade()
{
/* requestId property */
private int mRequestId
public int getRequestId() { return mRequestId; }
public void setRequestId(int r) { mRequestId = r; }
/* security property */
private Security mSecurity;
public Security getSecurity() { return mSecurity; }
public void setSecurity(Security s) {mSecurity = s;}
}
public class Security()
{
/* secId property */
private String mSecId;
public String getSecId() { return mSecId; }
public void setSecurity(String s) { mSecId = s; }
/* secType property */
private String mSecType;
public String getSecType() { return mSecType; }
public void setSecType(String s) { mSecType = s; }
}
The Trade java bean has two properties - requestId and security.
The Security java bean has two properties - secId and secType.
I am asserting both the Trade and its Security object in Java
code as follows:
/* assert Trade */
Funcall lFuncall = new Funcall("definstance", mRete);
lFuncall.add(new Value(aName, RU.ATOM));
lFuncall.add(new Value(aTrade));
lFuncall.execute(mRete.getGlobalContext());
/* assert Security*/
lFuncall = new Funcall("definstance", mRete);
lFuncall.add(new Value(aName, RU.ATOM));
lFuncall.add(new Value(aTrade.getSecurity()));
lFuncall.execute(mRete.getGlobalContext());
I am trying to write the following rule (pseudocode):
when a trade and its corresponding security asserted
get the security associated with the trade
get the secType of the security
if secType is CASH
(assert trade-is-cash ?requestId)
Why doesn't Jess accept the following:
(defrule is-cash
(trade (requestId ?requestId) (security ?security))
(?security (secType "CASH"))
=>
(assert trade-is-cash ?requestId)
)
Or using nested properties:
(defrule is-cash
(trade (requestId ?requestId) (security.secType CASH))
=>
(assert trade-is-cash ?requestId)
)
-Shoeb
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