hey,
Just wondering if anyone had any thought on this. I had to write up a
custom handler (code borrowed from an earlier post and make changes for
handling a list). The marshalling works but the unmarshalling tries to
create an instance and fails
for the type safe enums. This is kindof urgent and wanted to find out if
anyone has gotten this to work and if so how.
public class HmsiEnumTypeFieldHandler extends AbstractFieldHandler {
/**
* Returns the value of the field from the object. The object should
have a
* method named <code>"get" +
getFieldDescriptor().getFieldName()</code>.
* <br>
* <b>Example </b>: Field name =<code>identification</code>, method
* name =<code>getIdentification()</code>. This getter should return
the
* <i>typesafe enum </i> static instance.
*
* @param o
* The object
* @return The value of the field
* @throws IllegalStateException
* The Java object has changed and is no longer supported
by
* this handler, or the handler is not compatible with the
Java
* object
*/
public Object getValue(final Object o) throws IllegalStateException {
final FieldDescriptor fd = getFieldDescriptor();
final String name = fd.getFieldName();
final String methodName = "get".concat(
name.substring(0, 1).toUpperCase()).concat(
name.substring(1, name.length()));
try {
final Method method = o.getClass().getMethod(methodName,
new Class[] {});
// make sure we handle arrays of enums
Object result = method.invoke(o, new Object[] {});
if (result == null) {
return result;
}
if (result.getClass().isArray()) {
int size = Array.getLength(result);
String[] values = new String[size];
for (int i = 0; i < size; i++) {
values[i] = Array.get(result, i).toString();
}
result = values;
}
return result;
} catch (NoSuchMethodException e) {
e.printStackTrace();
throw new IllegalStateException("Class " + o.getClass()
+ " must have method " + methodName);
} catch (IllegalAccessException e) {
e.printStackTrace();
throw new IllegalStateException("Method " + methodName
+ " from class " + o.getClass() + " must be public");
} catch (InvocationTargetException e) {
e.printStackTrace();
throw new IllegalStateException("Method " + methodName
+ " from class " + o.getClass() + " threw an
exception");
}
}
/**
* Sets the value of the field on the object. The object should have a
field
* name <code>"_" + getFieldDescriptor().getFieldName()</code>.<br>
* <b>Example </b>: Field name =<code>identification</code>, object
* field name =<code>_identification</code>.
*
* @param o
* The object
* @param o1
* The new value
* @throws IllegalStateException
* The Java object has changed and is no longer supported
by
* this handler, or the handler is not compatible with the
Java
* object
* @throws IllegalArgumentException
*/
public void setValue(final Object o, final Object o1)
throws IllegalStateException, IllegalArgumentException {
final FieldDescriptor fd = getFieldDescriptor();
String name = fd.getFieldName();
final String methodName = "set".concat(
name.substring(0, 1).toUpperCase()).concat(
name.substring(1, name.length()));
name = "_".concat(name);
Class fieldClass = null;
try {
fieldClass = o.getClass().getDeclaredField(name).getType();
final Field[] fields = fieldClass.getDeclaredFields();
for (int i = 0; i < fields.length; i++) {
if (fields[i].get(null).toString().equals(o1.toString())) {
final Method method =
o.getClass().getMethod(methodName,
new Class[] { fields[i].getType() });
method.invoke(o, new Object[] { fields[i].get(null) });
break;
}
}
} catch (NoSuchFieldException e) {
e.printStackTrace();
throw new IllegalStateException("Field " + name + " must exist
in "
+ o.getClass());
} catch (NoSuchMethodException e) {
e.printStackTrace();
throw new IllegalStateException("Method " + methodName
+ " must exist in " + o.getClass());
} catch (IllegalAccessException e) {
e.printStackTrace();
throw new IllegalStateException("Class " +
fieldClass.getClass()
+ " must be accessible");
} catch (InvocationTargetException e) {
e.printStackTrace();
throw new IllegalStateException("Method " + methodName
+ " from class " + fieldClass.getClass()
+ " threw an exception");
}
}
/**
* Creates a new instance of the object described by this field.
*
* @param o
* The object for which the field is created
* @return A new instance of the field's value
* @throws IllegalStateException
* This field is a simple type and cannot be instantiated
*/
public Object newInstance(final Object o) throws IllegalStateException
{
throw new UnsupportedOperationException();
}
/**
* Creates a new instance of the object described by this field.
*
* @param o
* The object for which the field is created
* @param objects
* The set of constructor arguments
* @return A new instance of the field's value
* @throws IllegalStateException
* This field is a simple type and cannot be instantiated
*/
public Object newInstance(final Object o, final Object[] objects)
throws IllegalStateException {
throw new UnsupportedOperationException();
}
/**
* Sets the value of the field to a default value. Reference fields are
set
* to null, primitive fields are set to their default value, collection
* fields are emptied of all elements.
*
* @param o
* The object
* @throws IllegalStateException
* The Java object has changed and is no longer supported
by
* this handler, or the handler is not compatiale with the
Java
* object
* @throws IllegalArgumentException
*/
public void resetValue(final Object o) throws IllegalStateException,
IllegalArgumentException {
throw new UnsupportedOperationException();
}
}
My mapping.xml snippets
<class name="databean.types.Subjects"
access="shared"
verify-constructable="false"
auto-complete="true">
</class>
<class
name="databean.impl.SubjectDataResponse"
access="shared"
auto-complete="false">
<map-to xml="subjectDataResponse" />
<cache-type type="count-limited" />
<field name="subjects"
type="databean.types.Subjects"
handler="marshalling.HmsiEnumTypeFieldHandler"
get-method="getSubjects"
set-method="setSubjects"
collection="arraylist">
<bind-xml name="subjects" />
</field>
</class>
Thanks
Ram
|---------+---------------------------->
| | Ram Sarma |
| | |
| | 01/11/2005 10:00 |
| | AM |
| | |
|---------+---------------------------->
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|
|
| To: castor-dev@exolab.org
|
| cc:
|
| Subject: TypeSafe Enums and Collections(Document link: Ram Sarma)
|
>--------------------------------------------------------------------------------------------------------------------------------------------------|
hey,
Was wondering if anyone got typesafe enums and collections to work
together. I have a class say A which has a field which returns a collection
of type safe enums B. When I use the mapping.xml (which has
verify-constructable = false and auto-complete = true for the type safe
enum B and class B also has a static valueOf method and a toString method).
The resulting XML generated does not contain data from B instead simply
contains a chunk of <B/> tags. I saw a posting sometime
back about the same but there was no replies for it.
I was wondering if someone had gotten this to work.
Thanks
Ram
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