From 63fcf226fc65456971144670428e56a8b4cf3145 Mon Sep 17 00:00:00 2001
From: Andrew Woods <awoods@duraspace.org>
Date: Thu, 7 Jul 2016 15:03:48 -0400
Subject: [PATCH] Allow resources that are referenced by other versioned
 resources to be deleted

Resolves: https://jira.duraspace.org/browse/FCREPO-2074
---
 .../kernel/modeshape/FedoraResourceImpl.java  | 12 ++++--
 .../modeshape/FedoraResourceImplIT.java       | 39 +++++++++++++++++++
 2 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/fcrepo-kernel-modeshape/src/main/java/org/fcrepo/kernel/modeshape/FedoraResourceImpl.java b/fcrepo-kernel-modeshape/src/main/java/org/fcrepo/kernel/modeshape/FedoraResourceImpl.java
index 7d7bd2a466..ddbb93f42e 100644
--- a/fcrepo-kernel-modeshape/src/main/java/org/fcrepo/kernel/modeshape/FedoraResourceImpl.java
+++ b/fcrepo-kernel-modeshape/src/main/java/org/fcrepo/kernel/modeshape/FedoraResourceImpl.java
@@ -26,8 +26,6 @@
 import static java.util.stream.Stream.empty;
 import static java.util.stream.Stream.of;
 import static org.apache.commons.codec.digest.DigestUtils.shaHex;
-import static org.fcrepo.kernel.api.FedoraTypes.FEDORA_LASTMODIFIED;
-import static org.fcrepo.kernel.api.FedoraTypes.FEDORA_REPOSITORY_ROOT;
 import static org.fcrepo.kernel.api.RdfLexicon.LAST_MODIFIED_DATE;
 import static org.fcrepo.kernel.api.RdfLexicon.REPOSITORY_NAMESPACE;
 import static org.fcrepo.kernel.api.RdfLexicon.isManagedNamespace;
@@ -157,6 +155,7 @@ public class FedoraResourceImpl extends JcrTools implements FedoraTypes, FedoraR
     private static final String JCR_CHILD_VERSION_HISTORY = "jcr:childVersionHistory";
     private static final String JCR_VERSIONABLE_UUID = "jcr:versionableUuid";
     private static final String JCR_FROZEN_UUID = "jcr:frozenUuid";
+    private static final String JCR_VERSION_STORAGE = "jcr:versionStorage";
 
     private static final PropertyConverter propertyConverter = new PropertyConverter();
 
@@ -378,7 +377,14 @@ public void delete() {
                         prop.setValue(newVals.toArray(new Value[newVals.size()]));
                     }
                 } catch (final RepositoryException ex) {
-                    throw new RepositoryRuntimeException(ex);
+                    // Ignore error from trying to update properties on versioned resources
+                    if (ex instanceof javax.jcr.nodetype.ConstraintViolationException &&
+                            ex.getMessage().contains(JCR_VERSION_STORAGE)) {
+                        LOGGER.debug("Ignoring exception trying to remove property from versioned resource: {}",
+                                ex.getMessage());
+                    } else {
+                        throw new RepositoryRuntimeException(ex);
+                    }
                 }
             });
 
diff --git a/fcrepo-kernel-modeshape/src/test/java/org/fcrepo/integration/kernel/modeshape/FedoraResourceImplIT.java b/fcrepo-kernel-modeshape/src/test/java/org/fcrepo/integration/kernel/modeshape/FedoraResourceImplIT.java
index a2227756f0..b08fa227c6 100644
--- a/fcrepo-kernel-modeshape/src/test/java/org/fcrepo/integration/kernel/modeshape/FedoraResourceImplIT.java
+++ b/fcrepo-kernel-modeshape/src/test/java/org/fcrepo/integration/kernel/modeshape/FedoraResourceImplIT.java
@@ -1005,6 +1005,45 @@ public void testVersionedChildBinaryDeleted() throws RepositoryException, Invali
         }
     }
 
+    @Test
+    public void testDeleteLinkedVersionedResources() throws RepositoryException {
+        final Container object1 = containerService.findOrCreate(session, "/" + getRandomPid());
+        final Container object2 = containerService.findOrCreate(session, "/" + getRandomPid());
+
+        // Create a link between objects 1 and 2
+        object2.updateProperties(subjects, "PREFIX example: <http://example.org/>\n" +
+                "INSERT { <> <example:link> " + "<" + createGraphSubjectNode(object1).getURI() + ">" +
+                " } WHERE {} ",
+                object2.getTriples(subjects, emptySet()));
+
+        // Create version of object2
+        versionService.createVersion(session, object2.getPath(), "obj2-v0");
+
+        // Verify that the objects exist
+        assertTrue("object1 should exist!", exists(object1));
+        assertTrue("object2 should exist!", exists(object2));
+
+        // This is the test: verify successful deletion of the objects
+        object2.delete();
+        session.save();
+
+        object1.delete();
+        session.save();
+
+        // Double-verify that the objects are gone
+        assertFalse("/object2 should NOT exist!", exists(object2));
+        assertFalse("/object1 should NOT exist!", exists(object1));
+    }
+
+    private boolean exists(final Container resource) {
+        try {
+            resource.getPath();
+            return true;
+        } catch (RepositoryRuntimeException e) {
+            return false;
+        }
+    }
+
     @Test (expected = RepositoryRuntimeException.class)
     public void testNullBaseVersion() throws RepositoryException {
         final String pid = getRandomPid();