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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
   7 import org.apache.commons.logging.Log;
   8 import org.apache.commons.logging.LogFactory;
   9 import org.collectionspace.services.client.workflow.WorkflowClient;
  10 import org.collectionspace.services.nuxeo.client.java.CoreSessionInterface;
  11 import org.collectionspace.services.nuxeo.client.java.CoreSessionWrapper;
  12 import org.nuxeo.ecm.core.api.ClientException;
  13 import org.nuxeo.ecm.core.api.DocumentModel;
  14 import org.nuxeo.ecm.core.api.DocumentModelList;
  15 import org.nuxeo.ecm.core.api.impl.LifeCycleFilter;
  16 import org.nuxeo.ecm.core.event.Event;
  17 import org.nuxeo.ecm.core.event.EventContext;
  18 import org.nuxeo.ecm.core.event.EventListener;
  19 import org.nuxeo.ecm.core.event.impl.DocumentEventContext;
  20
  21 public class UpdateRelationsOnDelete implements EventListener {
  22
  23     // FIXME: We might experiment here with using log4j instead of Apache Commons Logging;
  24     // am using the latter to follow Ray's pattern for now
  25     final Log logger = LogFactory.getLog(UpdateRelationsOnDelete.class);
  26
  27     // FIXME: Get these constant values from external sources rather than redeclaring here
  28     final static String RELATION_DOCTYPE = "Relation";
  29     final static String RELATIONS_COMMON_SUBJECT_CSID_FIELD = "relations_common:subjectCsid";
  30     final static String RELATIONS_COMMON_OBJECT_CSID_FIELD = "relations_common:objectCsid";
  31
  32     @Override
  33     public void handleEvent(Event event) throws ClientException {
  34         logger.trace("In handleEvent in UpdateRelationsOnDelete ...");
  35
  36         EventContext eventContext = event.getContext();
  37
  38         if (isDocumentSoftDeletedEvent(eventContext)) {
  39
  40             logger.trace("A soft deletion event was received by UpdateRelationsOnDelete ...");
  41
  42             DocumentEventContext docContext = (DocumentEventContext) eventContext;
  43             DocumentModel docModel = docContext.getSourceDocument();
  44
  45             // Exclude soft deletion events involving Relation records themselves
  46             // from handling by this event handler.
  47             if (docModel != null && docModel.getType().startsWith(RELATION_DOCTYPE)) {
  48                 return;
  49             }
  50
  51             // Retrieve a list of relation records, where the soft deleted
  52             // document provided in the context of the current event is
  53             // either the subject or object of any relation
  54
  55             // Build a query string
  56             String csid = docModel.getName();
  57
  58             String queryString;
  59             try {
  60                 queryString =
  61                     String.format("SELECT * FROM Relation WHERE ecm:isProxy = 0 AND (%1$s='%3$s' OR %2$s='%3$s')",
  62                     RELATIONS_COMMON_SUBJECT_CSID_FIELD, RELATIONS_COMMON_OBJECT_CSID_FIELD, csid);
  63                 logger.trace("Query string=" + queryString);
  64             } catch (IllegalFormatException ife) {
  65                 logger.warn("Construction of formatted query string failed: ", ife);
  66                 logger.warn("Actions in this event listener will NOT be performed, as a result of a previous Exception.");
  67                 return;
  68             }
  69
  70             // Create a filter to exclude from the list results any records
  71             // that have already been soft deleted or are locked
  72             List<String> workflowStatesToFilter = new ArrayList<String>();
  73             workflowStatesToFilter.add(WorkflowClient.WORKFLOWSTATE_DELETED);
  74             workflowStatesToFilter.add(WorkflowClient.WORKFLOWSTATE_LOCKED);
  75             workflowStatesToFilter.add(WorkflowClient.WORKFLOWSTATE_LOCKED_DELETED);
  76             LifeCycleFilter workflowStateFilter = new LifeCycleFilter(null, workflowStatesToFilter);
  77
  78             // Perform the filtered query
  79             CoreSessionInterface session = new CoreSessionWrapper(docModel.getCoreSession());
  80             DocumentModelList matchingDocuments;
  81             try {
  82                 matchingDocuments = session.query(queryString.toString(), workflowStateFilter);
  83             } catch (ClientException ce) {
  84                 logger.warn("Error attempting to retrieve relation records where "
  85                         + "record of type '" + docModel.getType() + "' with CSID " + csid
  86                         + " is the subject or object of any relation: " + ce.getMessage());
  87                 throw ce;
  88             }
  89
  90             // Cycle through the list results, soft deleting each matching relation record
  91             logger.info("Attempting to soft delete " + matchingDocuments.size() + " relation records pertaining to a soft deleted record.");
  92             for (DocumentModel doc : matchingDocuments) {
  93                 doc.followTransition(WorkflowClient.WORKFLOWTRANSITION_DELETE);
  94             }
  95
  96         }
  97
  98     }
  99
 100     // FIXME: Generic methods like the following might be split off
 101     // into an event utilities class. - ADR 2012-12-05
 102
 103     /**
 104      * Identifies whether a supplied event concerns a document that has
 105      * been transitioned to the 'deleted' workflow state.
 106      *
 107      * @param eventContext an event context
 108      *
 109      * @return true if this event concerns a document that has
 110      * been transitioned to the 'deleted' workflow state.
 111      */
 112     private boolean isDocumentSoftDeletedEvent(EventContext eventContext) {
 113         boolean isSoftDeletedEvent = false;
 114
 115         if (eventContext instanceof DocumentEventContext) {
 116             if (eventContext.getProperties().containsKey(WorkflowClient.WORKFLOWTRANSITION_TO)
 117                     &&
 118                 (eventContext.getProperties().get(WorkflowClient.WORKFLOWTRANSITION_TO).equals(WorkflowClient.WORKFLOWSTATE_DELETED)
 119                                 ||
 120                 eventContext.getProperties().get(WorkflowClient.WORKFLOWTRANSITION_TO).equals(WorkflowClient.WORKFLOWSTATE_LOCKED_DELETED))) {
 121                 isSoftDeletedEvent = true;
 122             }
 123         }
 124
 125         return isSoftDeletedEvent;
 126     }
 127 }