antoine wrote:
> Sergiu Dumitriu a écrit :
>> antoine SEILLES wrote:
>>
>>> I have an AnnotationPluginApi.java class and i have a method to get all
>>> the annotations associated to a document:
>>> public Vector getAnnotations(Document doc){
>>> return doc.getObjects("AnnotationClass");
>>> }
>>>
>>> Now i'd like to have a method to get all the annotations associated to a
>>> document having a specific value specified in parameters for one field :
>>> public Vector getAnnotations(Document doc, String field, String value)
>>> Wich should return all the annotations having the value "value" for the
>>> field "field".
>>>
>> There is no 1-call way to do this. We have a method that returns one
>> object based on a property=value constraint (see
>> com.xpn.xwiki.api.Document#getObject(String, String, String)).
>>
>> So, there are two ways of doing this. One is to write an HQL query for
>> this, and the other is to manually iterate over the objects.
>>
>> The query approach is much too low level, and depends on the storage
>> being based on hibernate, so I'll leave this out of the discussion.
>>
>> The second method would be like this:
>>
>> public Vector getAnnotations(Document doc, String field, String value)
>> {
>> Vector result = new Vector();
>> Vector allObjects = doc.getObjects(classname);
>> if (allObjects == null || allObjects.size() == 0) {
>> return result;
>> } else {
>> for (Iterator it = allObjects.iterator(); it.hasNext();) {
>> BaseObject obj = (BaseObject) it.next();
>> if (value.equals(((BaseProperty) obj.get(key)).getValue())) {
>> result.add(newObjectApi(obj, getXWikiContext()));
>> }
>> }
>> }
>> return result;
>> }
>>
>> You should also add some checks to see if the field, value, and obj.get
>> are not null, otherwise you might get some exceptions.
>>
>> Sergiu
>>
> Well i have tried this :
>
> public Vector getAnnotations(Document doc, String field, String value)
> throws XWikiException
> {
> Vector result = new Vector();
> Vector allObjects = doc.getDocument().getObjects("AnnotationClass");
> if (allObjects == null || allObjects.size() == 0) {
> return result;
> } else {
> int limit = allObjects.size();
> for (int i=0; i<limit;i++)
> {
> BaseObject obj = (BaseObject)allObjects.get(i);
> if (value.equalsIgnoreCase((String)((BaseProperty)
> obj.get(field)).getValue()))
> {
> result.add(obj);
> }
> }
> }
> return result;
> }
>
> But when i call getAnnotations(Document doc, String field, String value)
> in velocity i have an error: "Error number 4001 in 4: Error while
> parsing velocity page Wrapped Exception: Invocation of method
> 'getRenderedContent' in class com.xpn.xwiki.api.Document threw exception
> java.lang.NullPointerException @ [28,44"
>
> And when i try that:
>
> * *public Vector getAnnotations(Document doc, String field, String
> value) throws XWikiException
> {
> Vector result = new Vector();
> Vector allObjects = doc.getObjects("AnnotationClass");
> if (allObjects == null || allObjects.size() == 0) {
> return result;
> } else {
> int limit = allObjects.size();
> for (int i=0; i<limit;i++)
> {
> BaseObject obj = (BaseObject)allObjects.get(i);
> if (value.equalsIgnoreCase((String)((BaseProperty)
> obj.get(field)).getValue()))
> {
> result.add(obj);
> }
> }
> }
> return result;
> }
>
> I have a cast error : cannot cast Object into BaseObject.
> Problem is BaseObject obj = (BaseObject)allObjects.get(i);
>
Here, allObjects contains API wrappers, and not internal objects, so you
don't have com.xpn.xwiki.object.BaseObject there, but
com.xpn.xwiki.api.Object
In that case you must use this check:
if (value.equalsIgnoreCase((String)((Property)
obj.getProperty(field)).getValue()))
The problem is that now you will get the same NullPointerException as
above. I told you to check if the result of obj.get is null, so you must
do something like:
Property prop = (Property) obj.getProperty(field);
if (prop != null && value.equalsIgnoreCase(prop.getValue())) {
> Anybody has an idea?
>
--
Sergiu Dumitriu
http://purl.org/net/sergiu/
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