|| metadata instanceof ArtifactRepositoryMetadata) {
                // eaten, handled by repo system
            } else {
                request.addMetadata(new MetadataBridge(metadata));
            }
        }

        try {
            repoSystem.install(session, request);
        } catch (InstallationException e) {

    public void test_metaDataOperations() {
        // Test metadata operations
        ResponseData data = new ResponseData();

        // Add metadata
        data.addMetaData("key1", "value1");
        data.addMetaData("key2", 123);
        data.addMetaData("key3", true);

        Map<String, Object> metaDataMap = data.getMetaDataMap();
        assertNotNull(metaDataMap);
        assertEquals(3, metaDataMap.size());

        String snapshotKey = null;
        if (artifact.isSnapshot()) {
            snapshotKey = versionKey + ':' + artifact.getBaseVersion();
            request.addMetadata(relatedMetadata.get(snapshotKey));
        }
        request.addMetadata(relatedMetadata.get(versionKey));

        for (ArtifactMetadata metadata : artifact.getMetadataList()) {

                if (owner != null) {
                    responseData.addMetaData(FS_FILE_USER, owner.getName());
                }
            }

            final AclFileAttributeView aclFileAttributeView = Files.getFileAttributeView(file.toPath(), AclFileAttributeView.class);
            if (aclFileAttributeView != null) {
                responseData.addMetaData(FILE_ATTRIBUTE_VIEW, aclFileAttributeView);

        ArtifactMetadata metadata = createMetadata(artifact);

        artifact.addMetadata(metadata);
    }

    @Override
    public void transformForDeployment(
            Artifact artifact, ArtifactRepository remoteRepository, ArtifactRepository localRepository) {
        ArtifactMetadata metadata = createMetadata(artifact);

        artifact.addMetadata(metadata);
    }

                    processAllowedSIDs(file, ace.getSID(), ace.isAllow() ? sidAllowSet : sidDenySet);
                }
                responseData.addMetaData(SMB_ALLOWED_SID_ENTRIES, sidAllowSet.toArray(new SID[sidAllowSet.size()]));
                responseData.addMetaData(SMB_DENIED_SID_ENTRIES, sidDenySet.toArray(new SID[sidDenySet.size()]));
            }
        } catch (final IOException e) {

                    processAllowedSIDs(file, ace.getSID(), ace.isAllow() ? sidAllowSet : sidDenySet);
                }
                responseData.addMetaData(SMB_ALLOWED_SID_ENTRIES, sidAllowSet.toArray(new SID[sidAllowSet.size()]));
                responseData.addMetaData(SMB_DENIED_SID_ENTRIES, sidDenySet.toArray(new SID[sidDenySet.size()]));
            }
        } catch (final IOException e) {

            Snapshot snapshot = new Snapshot();
            snapshot.setLocalCopy(true);
            RepositoryMetadata metadata = new SnapshotArtifactRepositoryMetadata(artifact, snapshot);

            artifact.addMetadata(metadata);
        }
    }

    @Override
    public void transformForDeployment(
            Artifact artifact, ArtifactRepository remoteRepository, ArtifactRepository localRepository)

        return metadata;
    }

    @Override
    public void merge(org.apache.maven.repository.legacy.metadata.ArtifactMetadata metadata) {
        // TODO not sure that it should assume this, maybe the calls to addMetadata should pre-merge, then artifact
        // replaces?
        AbstractRepositoryMetadata repoMetadata = (AbstractRepositoryMetadata) metadata;
        this.metadata.merge(repoMetadata.getMetadata());
    }

        NullResponseProcessor processor = new NullResponseProcessor();
        ResponseData responseData = new ResponseData();

        responseData.addMetaData("key1", "value1");
        responseData.addMetaData("key2", 123);

        // Execute - should not throw any exception
        processor.process(responseData);

        // Verify metadata is unchanged