Added aai-utils and OXM Model Loader functionality

Issue-ID: AAI-245 
Change-Id: Ic982cc07dd76e8a931d4f725ca4e71f2db7ef8a2
Signed-off-by: Shwetank Dave <shwetank.dave@amdocs.com>

3 files changed, 227 insertions, 0 deletions

diff --git a/aai-utils/src/main/java/org/onap/aaiutils/oxm/OxmModelLoader.java b/aai-utils/src/main/java/org/onap/aaiutils/oxm/OxmModelLoader.java
new file mode 100644
index 00000000..9d9d9ad3
--- /dev/null
+++ b/aai-utils/src/main/java/org/onap/aaiutils/oxm/OxmModelLoader.java
@@ -0,0 +1,129 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property.
+ * Copyright © 2017 Amdocs
+ * All rights reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.aaiutils.oxm;
+
+import org.eclipse.persistence.jaxb.JAXBContextProperties;
+import org.eclipse.persistence.jaxb.dynamic.DynamicJAXBContext;
+import org.eclipse.persistence.jaxb.dynamic.DynamicJAXBContextFactory;
+import org.openecomp.cl.eelf.LoggerFactory;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
+import org.springframework.core.io.support.ResourcePatternResolver;
+
+import java.io.*;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import javax.xml.bind.JAXBException;
+
+
+public class OxmModelLoader {
+
+    final static Pattern p = Pattern.compile("aai_oxm_(.*).xml");
+
+  private static Map<String, DynamicJAXBContext> versionContextMap  = new ConcurrentHashMap();
+
+  private static org.openecomp.cl.api.Logger logger = LoggerFactory.getInstance()
+      .getLogger(OxmModelLoader.class.getName());
+
+  public synchronized static void loadModels() throws Exception {
+    ClassLoader cl = OxmModelLoader.class.getClassLoader();
+    ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(cl);
+    Resource[] resources;
+    try {
+      resources = resolver.getResources("classpath*:/oxm/aai_oxm*.xml");
+    } catch (IOException ex) {
+      logger.error( OxmModelLoaderMsgs.OXM_LOAD_ERROR, ex.getMessage());
+      throw new FileNotFoundException("OXM files not found on classpath.");
+    }
+
+    if (resources.length == 0) {
+      logger.error(OxmModelLoaderMsgs.OXM_LOAD_ERROR, "No OXM schema files found on classpath");
+      throw new Exception("Failed to load schema");
+    }
+
+    for (Resource resource : resources) {
+      Matcher matcher = p.matcher(resource.getFilename());
+
+      if (matcher.matches()) {
+        try {
+          OxmModelLoader.loadModel(matcher.group(1), resource);
+        } catch (Exception e) {
+          logger.error(OxmModelLoaderMsgs.OXM_LOAD_ERROR, "Failed to load " + resource.getFilename()
+              + ": " + e.getMessage());
+          throw new Exception("Failed to load schema");
+        }
+      }
+    }
+  }
+
+  public static DynamicJAXBContext getContextForVersion(String version) throws Exception {
+    if (versionContextMap == null || versionContextMap.isEmpty()) {
+      loadModels();
+    } else if (!versionContextMap.containsKey(version)) {
+      String filename = OxmModelLoaderConstants.AaiUtils_HOME_MODEL + "aai_oxm_" + version + ".xml";
+      try {
+        loadModel(version, new File(filename));
+      } catch (Exception e) {
+        throw new FileNotFoundException(filename);
+      }
+    }
+
+    return versionContextMap.get(version);
+  }
+
+  public static Map<String, DynamicJAXBContext> getVersionContextMap() {
+    return versionContextMap;
+  }
+
+  public static void setVersionContextMap(Map<String, DynamicJAXBContext> versionContextMap) {
+    OxmModelLoader.versionContextMap = versionContextMap;
+  }
+
+  private synchronized static void loadModel ( String version, File file )
+          throws JAXBException, IOException {
+      InputStream inputStream = new FileInputStream ( file );
+      loadModel ( version, file.getName (), inputStream );
+  }
+
+  private synchronized static void loadModel ( String version, Resource resource )
+          throws JAXBException, IOException {
+      InputStream inputStream = resource.getInputStream ();
+      loadModel ( version, resource.getFilename (), inputStream );
+  }
+
+  private synchronized static void loadModel ( String version, String resourceName,
+                                               InputStream inputStream )
+          throws JAXBException, IOException {
+      Map<String, Object> properties = new HashMap<String, Object> ();
+      properties.put ( JAXBContextProperties.OXM_METADATA_SOURCE, inputStream );
+      final DynamicJAXBContext jaxbContext = DynamicJAXBContextFactory
+              .createContextFromOXM ( Thread.currentThread ().getContextClassLoader (), properties );
+      versionContextMap.put ( version, jaxbContext );
+      logger.info ( OxmModelLoaderMsgs.LOADED_OXM_FILE, resourceName );
+    }
+
+}
diff --git a/aai-utils/src/main/java/org/onap/aaiutils/oxm/OxmModelLoaderConstants.java b/aai-utils/src/main/java/org/onap/aaiutils/oxm/OxmModelLoaderConstants.java
new file mode 100644
index 00000000..0f8a54f5
--- /dev/null
+++ b/aai-utils/src/main/java/org/onap/aaiutils/oxm/OxmModelLoaderConstants.java
@@ -0,0 +1,34 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property.
+ * Copyright © 2017 Amdocs
+ * All rights reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.aaiutils.oxm;
+
+public class OxmModelLoaderConstants {
+
+    public static final String AaiUtils_FILESEP = (System.getProperty ( "file.separator" ) == null) ? "/"
+            : System.getProperty ( "file.separator" );
+
+    public static final String AaiUtils_SPECIFIC_CONFIG = System.getProperty ( "CONFIG_HOME" ) + AaiUtils_FILESEP;
+
+    public static final String AaiUtils_HOME_MODEL = AaiUtils_SPECIFIC_CONFIG + "model" + AaiUtils_FILESEP;
+}
diff --git a/aai-utils/src/main/java/org/onap/aaiutils/oxm/OxmModelLoaderMsgs.java b/aai-utils/src/main/java/org/onap/aaiutils/oxm/OxmModelLoaderMsgs.java
new file mode 100644
index 00000000..c94e3f1b
--- /dev/null
+++ b/aai-utils/src/main/java/org/onap/aaiutils/oxm/OxmModelLoaderMsgs.java
@@ -0,0 +1,64 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property.
+ * Copyright © 2017 Amdocs
+ * All rights reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.aaiutils.oxm;
+
+import com.att.eelf.i18n.EELFResourceManager;
+import org.openecomp.cl.eelf.LogMessageEnum;
+
+public enum OxmModelLoaderMsgs implements LogMessageEnum {
+
+
+    /**
+     * Invalid Model File
+     * Arguments:
+     * {0} = File/Dir
+     * {1} = error
+     */
+
+    INVALID_OXM_FILE,
+    INVALID_OXM_DIR,
+
+    /**
+     * Unable to load OXM schema: {0}
+     *
+     * <p>Arguments:
+     * {0} = error
+     */
+    OXM_LOAD_ERROR,
+
+    /**
+     * Successfully loaded schema: {0}
+     *
+     * <p>Arguments:
+     * {0} = oxm filename
+     */
+    LOADED_OXM_FILE;
+
+    /**
+     * Static initializer to ensure the resource bundles for this class are loaded...
+     */
+    static {
+        EELFResourceManager.loadMessageBundle("oxm/OxmModelLoaderMsgs");
+    }
+}