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Why do Dynamic Elements get values from enclosing component in takeValuesFromRequest?

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Why do Dynamic Elements get values from enclosing component in takeValuesFromRequest?

Subject: Why do Dynamic Elements get values from enclosing component in takeValuesFromRequest?
From: Karthik N <email@hidden>
Date: Wed, 25 Feb 2009 19:00:23 -0800

Hi,

Out of curiosity, I have been trying to understand the request-response loop. I have a fairly simple WO Component that has a WOTextField in it.

Please enter your name: <webobject name = "userName"></webobject>

</webobject>

In the .java file I just print the stack trace as follows to understand the flow:

public String getUserName() {

Exception e = new Exception();

e.printStackTrace();

System.out.println("user name is " + userName );

return userName;

}

public void setUserName(String userName) {

Exception e = new Exception();

e.printStackTrace();

this.userName = userName;

}

When I hit submitMe, I would have thought that only the setUserName would have got called in takeValuesFromRequest.

However I find that instead the getUserName() gets called first and then the setUserName() gets called.

Why is there a necessity for the WOTextField to actually get() values from the enclosing component in a takeValuesFromRequest() stage of the request-response cycle?

Stack traces in chronological order:

java.lang.Exception

at your.app.components.Main.getUserName(Main.java:10)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:585)

at com.webobjects.foundation.NSKeyValueCoding$ValueAccessor$1.methodValue(NSKeyValueCoding.java:636)

at com.webobjects.foundation.NSKeyValueCoding$_MethodBinding.valueInObject(NSKeyValueCoding.java:1134)

at com.webobjects.foundation.NSKeyValueCoding$DefaultImplementation.valueForKey(NSKeyValueCoding.java:1324)

at com.webobjects.appserver.WOComponent.valueForKey(WOComponent.java:1736)

at com.webobjects.foundation.NSKeyValueCoding$Utility.valueForKey(NSKeyValueCoding.java:447)

at com.webobjects.foundation.NSValidation$DefaultImplementation.validateTakeValueForKeyPath(NSValidation.java:676)

at com.webobjects.appserver.WOComponent.validateTakeValueForKeyPath(WOComponent.java:1424)

at com.webobjects.appserver._private.WOKeyValueAssociation.setValue(WOKeyValueAssociation.java:76)

at com.webobjects.appserver._private.WOTextField.takeValuesFromRequest(WOTextField.java:102)

at com.webobjects.appserver._private.WODynamicGroup.takeChildrenValuesFromRequest(WODynamicGroup.java:84)

at com.webobjects.appserver._private.WODynamicGroup.takeValuesFromRequest(WODynamicGroup.java:93)

at com.webobjects.appserver._private.WOForm.takeValuesFromRequest(WOForm.java:122)

at com.webobjects.appserver._private.WODynamicGroup.takeChildrenValuesFromRequest(WODynamicGroup.java:84)

at com.webobjects.appserver._private.WODynamicGroup.takeValuesFromRequest(WODynamicGroup.java:93)

at com.webobjects.appserver.WOComponent.takeValuesFromRequest(WOComponent.java:1051)

at com.webobjects.appserver.WOSession.takeValuesFromRequest(WOSession.java:1331)

at com.webobjects.appserver.WOApplication.takeValuesFromRequest(WOApplication.java:1724)

at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedPage(WOComponentRequestHandler.java:199)

at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedSession(WOComponentRequestHandler.java:298)

at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedApplication(WOComponentRequestHandler.java:332)

at com.webobjects.appserver._private.WOComponentRequestHandler._handleRequest(WOComponentRequestHandler.java:369)

at com.webobjects.appserver._private.WOComponentRequestHandler.handleRequest(WOComponentRequestHandler.java:442)

at com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:1687)

at com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144)

at com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:226)

at java.lang.Thread.run(Thread.java:613)

---------------

java.lang.Exception

at your.app.components.Main.setUserName(Main.java:17)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:585)

at com.webobjects.foundation.NSKeyValueCoding$ValueAccessor$1.setMethodValue(NSKeyValueCoding.java:643)

at com.webobjects.foundation.NSKeyValueCoding$_MethodBinding.setValueInObject(NSKeyValueCoding.java:1150)

at com.webobjects.foundation.NSKeyValueCoding$DefaultImplementation.takeValueForKey(NSKeyValueCoding.java:1354)

at com.webobjects.appserver.WOComponent.takeValueForKey(WOComponent.java:1748)

at com.webobjects.foundation.NSKeyValueCoding$Utility.takeValueForKey(NSKeyValueCoding.java:469)

at com.webobjects.foundation.NSValidation$DefaultImplementation.validateTakeValueForKeyPath(NSValidation.java:679)