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1 package org.collectionspace.services.listener;
2
3 import java.util.ArrayList;
4 import java.util.IllegalFormatException;
5 import java.util.List;
6 import org.apache.commons.logging.Log;
7 import org.apache.commons.logging.LogFactory;
8 import org.collectionspace.services.client.workflow.WorkflowClient;
9 import org.nuxeo.ecm.core.api.ClientException;
10 import org.nuxeo.ecm.core.api.CoreSession;
11 import org.nuxeo.ecm.core.api.DocumentModel;
12 import org.nuxeo.ecm.core.api.DocumentModelList;
13 import org.nuxeo.ecm.core.api.impl.LifeCycleFilter;
14 import org.nuxeo.ecm.core.event.Event;
15 import org.nuxeo.ecm.core.event.EventContext;
16 import org.nuxeo.ecm.core.event.EventListener;
17 import org.nuxeo.ecm.core.event.impl.DocumentEventContext;
18
19 public class UpdateRelationsOnDelete implements EventListener {
20     
21     // FIXME: Get these constant values from external sources rather than redeclaring here
22     final static String RELATIONS_COMMON_SUBJECT_CSID_FIELD = "relations_common:subjectCsid";
23     final static String RELATIONS_COMMON_OBJECT_CSID_FIELD = "relations_common:objectCsid";
24
25     // FIXME: We might experiment here with using log4j instead of Apache Commons Logging;
26     // am using the latter to follow Ray's pattern for now
27     final Log logger = LogFactory.getLog(UpdateRelationsOnDelete.class);
28
29     @Override
30     public void handleEvent(Event event) throws ClientException {
31         logger.trace("In handleEvent in UpdateRelationsOnDelete ...");
32         
33         EventContext eventContext = event.getContext();
34
35         if (isDocumentSoftDeletedEvent(eventContext)) {
36             
37             logger.trace("A soft deletion event was received by UpdateRelationsOnDelete ...");
38             
39             DocumentEventContext docContext = (DocumentEventContext) eventContext;
40             DocumentModel docModel = docContext.getSourceDocument();
41             
42             // Retrieve a list of relation records, where the soft deleted
43             // document provided in the context of the current event is
44             // either the subject or object of any relation
45             
46             // Build a query string
47             String csid = docModel.getName();
48             
49             String queryString;
50             try {
51                 queryString =
52                     String.format("SELECT * FROM Relation WHERE ecm:isProxy = 0 AND (%1$s='%3$s' OR %2$s='%3$s')",
53                     RELATIONS_COMMON_SUBJECT_CSID_FIELD, RELATIONS_COMMON_OBJECT_CSID_FIELD, csid);
54                 logger.trace("Query string=" + queryString);
55             } catch (IllegalFormatException ife) {
56                 logger.warn("Construction of formatted query string failed: ", ife);
57                 logger.warn("Actions in this event listener will NOT be performed, as a result of a previous Exception.");
58                 return;
59             }
60             
61             // Create a filter to exclude from the list results any records
62             // that have already been soft deleted or are locked
63             List<String> workflowStatesToFilter = new ArrayList<String>();
64             workflowStatesToFilter.add(WorkflowClient.WORKFLOWSTATE_DELETED);
65             workflowStatesToFilter.add(WorkflowClient.WORKFLOWSTATE_LOCKED);
66             LifeCycleFilter workflowStateFilter = new LifeCycleFilter(null, workflowStatesToFilter);
67             
68             // Perform the filtered query
69             CoreSession session = docModel.getCoreSession();
70             DocumentModelList matchingDocuments;
71             try {
72                 matchingDocuments = session.query(queryString.toString(), workflowStateFilter);
73             } catch (ClientException ce) {
74                 logger.warn("Error attempting to retrieve relation records where "
75                         + "record of type '" + docModel.getType() + "' with CSID " + csid
76                         + " is the subject or object of any relation: " + ce.getMessage());
77                 throw ce;
78             }
79
80             // Cycle through the list results, soft deleting each matching relation record
81             logger.info("Attempting to soft delete " + matchingDocuments.size() + " relation records pertaining to a soft deleted record.");
82             for (DocumentModel doc : matchingDocuments) {
83                 doc.followTransition(WorkflowClient.WORKFLOWTRANSITION_DELETE);
84             }
85
86         }
87
88     }
89     
90     // FIXME: Generic methods like the following might be split off
91     // into an event utilities class. - ADR 2012-12-05
92
93     /**
94      * Identifies whether a supplied event concerns a document that has
95      * been transitioned to the 'deleted' workflow state.
96      * 
97      * @param eventContext an event context
98      * 
99      * @return true if this event concerns a document that has
100      * been transitioned to the 'deleted' workflow state.
101      */
102     private boolean isDocumentSoftDeletedEvent(EventContext eventContext) {
103         boolean isSoftDeletedEvent = false;
104         if (eventContext instanceof DocumentEventContext) {
105             if (eventContext.getProperties().containsKey(WorkflowClient.WORKFLOWTRANSITION_TO)
106                     && eventContext.getProperties().get(WorkflowClient.WORKFLOWTRANSITION_TO).equals(WorkflowClient.WORKFLOWSTATE_DELETED)) {
107                 isSoftDeletedEvent = true;
108             }
109         }
110         return isSoftDeletedEvent;
111     }
112     
113 }