/**
* Setup parameter accordnig to ZkParameter annotation.
*
* @param <T> type of field.
* @param annot the annotation with parameter definition
* @param field the field to set
* @param clazz class of the field and parameter
*/
protected static <T> void setupZkParameter(
ZkParameter annot,
String paramName,
Class<T> clazz,
Field field,
Method method,
Object instance) {
T result = null;
Map[] paramMaps =
new Map[] {
Executions.getCurrent().getArg(),
Executions.getCurrent().getAttributes(),
Executions.getCurrent().getParameterMap()
};
Map paramMap = paramMaps[0];
for (Map map : paramMaps) {
if (map.containsKey(paramName)) {
paramMap = map;
break;
}
}
try {
if (annot.required()) result = ZKHelper.getRequiredParameter(paramMap, paramName, clazz);
else if (!paramMap.containsKey(paramName)) return; // optional parameter doesn't do anything
else result = ZKHelper.getOptionalParameter(paramMap, paramName, clazz, null);
} catch (IllegalArgumentException ex) {
throw new IllegalArgumentException(
"@ZkParameter(name='"
+ paramName
+ "', "
+ "required="
+ (annot.required() ? "true" : "false")
+ ", "
+ "createIfNull="
+ (annot.createIfNull() ? "true" : "false")
+ "): "
+ ex.getLocalizedMessage());
}
if (result == null && annot.createIfNull())
try {
result = (T) clazz.newInstance();
} catch (InstantiationException ex) {
throw new InstantiationError(
"@ZkParameter(name='"
+ paramName
+ "', "
+ "required="
+ (annot.required() ? "true" : "false")
+ ", "
+ "createIfNull="
+ (annot.createIfNull() ? "true" : "false")
+ ") - Parameter is null, unable to create new object with error: "
+ ex.getLocalizedMessage());
} catch (IllegalAccessException ex) {
throw new InstantiationError(
"@ZkParameter(name='"
+ paramName
+ "', "
+ "required="
+ (annot.required() ? "true" : "false")
+ ", "
+ "createIfNull="
+ (annot.createIfNull() ? "true" : "false")
+ ") - Parameter is null, unable to create new object, no public default constructor: "
+ ex.getLocalizedMessage());
}
if (field != null)
try {
field.setAccessible(true);
field.set(instance, result);
field.setAccessible(false);
} catch (IllegalArgumentException ex) {
throw new IllegalArgumentException(
"@ZkParameter(name='"
+ paramName
+ "', "
+ "required="
+ (annot.required() ? "true" : "false")
+ ", "
+ "createIfNull="
+ (annot.createIfNull() ? "true" : "false")
+ ") - Unable to set new value of field to '"
+ result
+ "': "
+ ex.getLocalizedMessage(),
ex);
} catch (IllegalAccessException ex) {
throw SystemException.Aide.wrap(ex);
}
if (method != null)
try {
method.setAccessible(true);
method.invoke(instance, new Object[] {result});
method.setAccessible(false);
} catch (IllegalAccessException ex) {
throw SystemException.Aide.wrap(ex);
} catch (IllegalArgumentException ex) {
throw new IllegalArgumentException(
"@ZkParameter(name='"
+ paramName
+ "', "
+ "required="
+ (annot.required() ? "true" : "false")
+ ", "
+ "createIfNull="
+ (annot.createIfNull() ? "true" : "false")
+ ") - Unable to set new value of method to '"
+ result
+ "': "
+ ex.getClass()
+ " - "
+ ex.getLocalizedMessage(),
ex);
} catch (InvocationTargetException ex) {
throw new IllegalArgumentException(
"@ZkParameter(name='"
+ paramName
+ "', "
+ "required="
+ (annot.required() ? "true" : "false")
+ ", "
+ "createIfNull="
+ (annot.createIfNull() ? "true" : "false")
+ ") - Unable to set new value of method to '"
+ result
+ "', error in method invocation: "
+ ex.getClass()
+ " - "
+ (ex.getTargetException() == null
? ex.getLocalizedMessage()
: ex.getTargetException().getLocalizedMessage()),
ex);
}
}
private static String getName(final ZkParameter annotation, final Field field) {
return "".equals(annotation.name()) ? field.getName() : annotation.name();
}