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https://issues.apache.org/jira/browse/GORA-650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17344730#comment-17344730
]
ASF GitHub Bot commented on GORA-650:
-------------------------------------
kamaci commented on a change in pull request #218:
URL: https://github.com/apache/gora/pull/218#discussion_r632675364
##########
File path:
gora-arangodb/src/main/java/org/apache/gora/arangodb/store/ArangoDBMappingBuilder.java
##########
@@ -0,0 +1,119 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.gora.arangodb.store;
+
+import org.apache.gora.persistency.impl.PersistentBase;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+
+import org.jdom.Document;
+import org.jdom.Element;
+import org.jdom.input.SAXBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Utility builder for create ArangoDB mapping from gora-arango-mapping.xml.
+ */
+public class ArangoDBMappingBuilder<K, T extends PersistentBase> {
+
+ public static final String ATT_NAME = "name";
+ public static final String ATT_TYPE = "type";
+ public static final String TAG_CLASS = "class";
+ public static final String ATT_KEYCLASS = "keyClass";
+ public static final String ATT_DOCUMENT = "document";
+ public static final String TAG_FIELD = "field";
+ public static final String ATT_FIELD = "docfield";
+ public static final Logger log =
LoggerFactory.getLogger(ArangoDBMappingBuilder.class);
+
+ private final ArangoDBStore<K, T> dataStore;
+
+ private ArangoDBMapping mapping;
+
+ public ArangoDBMappingBuilder(final ArangoDBStore<K, T> store) {
+ this.dataStore = store;
+ this.mapping = new ArangoDBMapping();
+ }
+
+ public ArangoDBMapping build() {
+ if (mapping.getDocumentClass() == null)
+ throw new IllegalStateException("Document Class is not specified.");
+ return mapping;
+ }
+
+ protected ArangoDBMappingBuilder fromFile(String uri) throws IOException {
+ try {
+ SAXBuilder saxBuilder = new SAXBuilder();
+ InputStream is = getClass().getResourceAsStream(uri);
+ if (is == null) {
+ String msg = "Unable to load the mapping from classpath resource '" +
uri
+ + "' Re-trying local from local file system location.";
+ log.warn(msg);
+ is = new FileInputStream(uri);
+ }
+ Document doc = saxBuilder.build(is);
+ Element root = doc.getRootElement();
+ List<Element> classElements = root.getChildren(TAG_CLASS);
+ for (Element classElement : classElements) {
+ final Class<T> persistentClass = dataStore.getPersistentClass();
+ final Class<K> keyClass = dataStore.getKeyClass();
+ if (matchesKeyClassWithMapping(keyClass, classElement)
+ && matchesPersistentClassWithMapping(persistentClass,
classElement)) {
+ loadPersistentClass(classElement, persistentClass);
+ break;
+ }
+ }
+ } catch (IOException ex) {
+ throw ex;
+ } catch (Exception ex) {
Review comment:
Instead of this catch `Exception` and throw `IOException`.
On the other hand, what is the reason to wrap `Exception` as `IOException`?
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> Add datastore for ArangoDB
> --------------------------
>
> Key: GORA-650
> URL: https://issues.apache.org/jira/browse/GORA-650
> Project: Apache Gora
> Issue Type: New Feature
> Affects Versions: 0.9
> Reporter: Kevin Ratnasekera
> Priority: Major
> Labels: gsoc2020
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> May be we should consider extending our multimodal datastore support with
> ArangoDB. [1]
> [1] https://www.arangodb.com/why-arangodb/multi-model/
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