2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 * SPDX-License-Identifier: Apache-2.0
18 * ============LICENSE_END=========================================================
21 package org.onap.policy.apex.context.impl.schema;
23 import org.onap.policy.apex.context.ContextRuntimeException;
24 import org.onap.policy.apex.context.SchemaHelper;
25 import org.onap.policy.apex.context.parameters.ContextParameterConstants;
26 import org.onap.policy.apex.context.parameters.SchemaHelperParameters;
27 import org.onap.policy.apex.context.parameters.SchemaParameters;
28 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
29 import org.onap.policy.apex.model.basicmodel.concepts.AxKey;
30 import org.onap.policy.apex.model.basicmodel.service.ModelService;
31 import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchema;
32 import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchemas;
33 import org.onap.policy.apex.model.utilities.Assertions;
34 import org.onap.policy.common.parameters.ParameterService;
35 import org.slf4j.ext.XLogger;
36 import org.slf4j.ext.XLoggerFactory;
39 * This class returns a {@link SchemaHelper} for the particular type of schema mechanism configured for use.
41 * @author Liam Fallon (liam.fallon@ericsson.com)
43 public class SchemaHelperFactory {
44 // Get a reference to the logger
45 private static final XLogger LOGGER = XLoggerFactory.getXLogger(SchemaHelperFactory.class);
48 * Return a {@link SchemaHelper} for the particular type of schema mechanism configured for use.
50 * @param owningEntityKey The key of the entity that owns the schema helper
51 * @param schemaKey The key of the schema the schema helper is operating on
52 * @return a lock schema that can handle translation of objects in a particular schema format
53 * @throws ContextRuntimeException the context runtime exception
55 public SchemaHelper createSchemaHelper(final AxKey owningEntityKey, final AxArtifactKey schemaKey) {
56 LOGGER.entry("schema helper factory, owningEntityKey=" + owningEntityKey);
57 Assertions.argumentOfClassNotNull(owningEntityKey, ContextRuntimeException.class,
58 "Parameter \"owningEntityKey\" may not be null");
59 Assertions.argumentOfClassNotNull(schemaKey, ContextRuntimeException.class,
60 "Parameter \"schemaKey\" may not be null");
62 // Get the schema for items in the album
63 final AxContextSchema schema = ModelService.getModel(AxContextSchemas.class).get(schemaKey);
65 final String resultString = "schema \"" + schemaKey.getId() + "\" for entity " + owningEntityKey.getId()
67 LOGGER.warn(resultString);
68 throw new ContextRuntimeException(resultString);
71 // Get the schema class using the parameter service
72 final SchemaParameters schemaParameters = ParameterService.get(ContextParameterConstants.SCHEMA_GROUP_NAME);
74 // Get the class for the schema helper from the schema parameters
75 final SchemaHelperParameters schemaHelperParameters = schemaParameters
76 .getSchemaHelperParameters(schema.getSchemaFlavour());
77 if (schemaHelperParameters == null) {
78 final String resultString = "context schema helper parameters not found for context schema \""
79 + schema.getSchemaFlavour() + "\"";
80 LOGGER.warn(resultString);
81 throw new ContextRuntimeException(resultString);
84 // Get the class for the schema helper using reflection
85 Object schemaHelperObject = null;
86 final String pluginClass = schemaHelperParameters.getSchemaHelperPluginClass();
88 schemaHelperObject = Class.forName(pluginClass).newInstance();
89 } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
90 final String resultString = "Apex context schema helper class not found for context schema helper plugin \""
92 LOGGER.warn(resultString, e);
93 throw new ContextRuntimeException(resultString, e);
96 // Check the class is a schema helper
97 if (!(schemaHelperObject instanceof SchemaHelper)) {
98 final String resultString = "Specified Apex context schema helper plugin class \"" + pluginClass
99 + "\" does not implement the SchemaHelper interface";
100 LOGGER.warn(resultString);
101 throw new ContextRuntimeException(resultString);
104 // The context schema helper to return
105 final SchemaHelper schemaHelper = (SchemaHelper) schemaHelperObject;
107 // Lock and load the schema helper
108 schemaHelper.init(owningEntityKey.getKey(), schema);
110 LOGGER.exit("Schema Helper factory, owningEntityKey=" + owningEntityKey + ", selected schema helper of class "
111 + schemaHelper.getClass());