2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * Modifications Copyright (C) 2020 Nordix Foundation.
5 * ================================================================================
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 * SPDX-License-Identifier: Apache-2.0
19 * ============LICENSE_END=========================================================
22 package org.onap.policy.apex.service.parameters.eventprotocol;
24 import com.google.gson.JsonDeserializationContext;
25 import com.google.gson.JsonDeserializer;
26 import com.google.gson.JsonElement;
27 import com.google.gson.JsonObject;
28 import com.google.gson.JsonPrimitive;
29 import com.google.gson.JsonSerializationContext;
30 import com.google.gson.JsonSerializer;
31 import java.lang.reflect.Type;
32 import java.util.HashMap;
34 import org.onap.policy.apex.service.engine.event.impl.apexprotocolplugin.ApexEventProtocolParameters;
35 import org.onap.policy.apex.service.engine.event.impl.jsonprotocolplugin.JsonEventProtocolParameters;
36 import org.onap.policy.common.parameters.ParameterRuntimeException;
37 import org.slf4j.ext.XLogger;
38 import org.slf4j.ext.XLoggerFactory;
41 * This class serialises and deserialises various type of event protocol parameters to and from JSON.
43 * @author Liam Fallon (liam.fallon@ericsson.com)
45 public class EventProtocolParametersJsonAdapter
46 implements JsonSerializer<EventProtocolParameters>, JsonDeserializer<EventProtocolParameters> {
47 private static final XLogger LOGGER = XLoggerFactory.getXLogger(EventProtocolParametersJsonAdapter.class);
49 // Recurring string constants
50 private static final String EVENT_PROTOCOL_PREFIX = "event protocol \"";
51 private static final String VALUE_TAG = "\" value \"";
53 private static final String PARAMETER_CLASS_NAME = "parameterClassName";
55 private static final String EVENT_PROTOCOL_TOKEN = "eventProtocol";
56 private static final String EVENT_PROTOCOL_PARAMETERS = "parameters";
58 // Built in event protocol parameters
59 private static final Map<String, String> BUILT_IN_EVENT_PROTOCOL_PARMETER_CLASS_MAP = new HashMap<>();
62 BUILT_IN_EVENT_PROTOCOL_PARMETER_CLASS_MAP.put("JSON", JsonEventProtocolParameters.class.getName());
63 BUILT_IN_EVENT_PROTOCOL_PARMETER_CLASS_MAP.put("APEX", ApexEventProtocolParameters.class.getName());
70 public JsonElement serialize(final EventProtocolParameters src, final Type typeOfSrc,
71 final JsonSerializationContext context) {
72 final String returnMessage = "serialization of Apex event protocol parameters to Json is not supported";
73 LOGGER.error(returnMessage);
74 throw new ParameterRuntimeException(returnMessage);
81 public EventProtocolParameters deserialize(final JsonElement json, final Type typeOfT,
82 final JsonDeserializationContext context) {
83 final JsonObject jsonObject = json.getAsJsonObject();
85 // Get the event protocol label primitive
86 final JsonPrimitive labelJsonPrimitive = (JsonPrimitive) jsonObject.get(EVENT_PROTOCOL_TOKEN);
88 // Check if we found our event protocol
89 if (labelJsonPrimitive == null) {
90 LOGGER.warn("event protocol parameter \"" + EVENT_PROTOCOL_TOKEN + "\" not found in JSON file");
94 // Get and check the event protocol label
95 final String eventProtocolLabel = labelJsonPrimitive.getAsString().replaceAll("\\s+", "");
96 if (eventProtocolLabel == null || eventProtocolLabel.length() == 0) {
97 final String errorMessage = "event protocol parameter \"" + EVENT_PROTOCOL_TOKEN + VALUE_TAG
98 + labelJsonPrimitive.getAsString() + "\" invalid in JSON file";
99 LOGGER.warn(errorMessage);
100 throw new ParameterRuntimeException(errorMessage);
103 // We now get the event protocol parameter class
104 String eventProtocolParameterClassName = null;
106 // Get the event protocol parameter class for the event protocol plugin class from the
107 // configuration parameters
108 final JsonPrimitive classNameJsonPrimitive = (JsonPrimitive) jsonObject.get(PARAMETER_CLASS_NAME);
110 // If no event protocol parameter class was specified, we use the default
111 if (classNameJsonPrimitive == null) {
112 eventProtocolParameterClassName = BUILT_IN_EVENT_PROTOCOL_PARMETER_CLASS_MAP.get(eventProtocolLabel);
114 // We use the specified one
115 eventProtocolParameterClassName = classNameJsonPrimitive.getAsString().replaceAll("\\s+", "");
118 // Check the event protocol parameter class
119 if (eventProtocolParameterClassName == null || eventProtocolParameterClassName.length() == 0) {
120 final String errorMessage =
121 EVENT_PROTOCOL_PREFIX + eventProtocolLabel + "\" parameter \"" + PARAMETER_CLASS_NAME + VALUE_TAG
122 + (classNameJsonPrimitive != null ? classNameJsonPrimitive.getAsString() : "null")
123 + "\" invalid in JSON file";
124 LOGGER.warn(errorMessage);
125 throw new ParameterRuntimeException(errorMessage);
128 // Get the class for the event protocol
129 Class<?> eventProtocolParameterClass = null;
131 eventProtocolParameterClass = Class.forName(eventProtocolParameterClassName);
132 } catch (final ClassNotFoundException e) {
133 final String errorMessage = EVENT_PROTOCOL_PREFIX + eventProtocolLabel + "\" parameter \""
134 + PARAMETER_CLASS_NAME + VALUE_TAG + eventProtocolParameterClassName + "\", could not find class";
135 LOGGER.warn(errorMessage, e);
136 throw new ParameterRuntimeException(errorMessage, e);
139 // Deserialise the class
140 EventProtocolParameters eventProtocolParameters =
141 context.deserialize(jsonObject.get(EVENT_PROTOCOL_PARAMETERS), eventProtocolParameterClass);
142 if (eventProtocolParameters == null) {
143 // OK no parameters for the event protocol have been specified, just instantiate the
144 // default parameters
146 eventProtocolParameters =
147 (EventProtocolParameters) eventProtocolParameterClass.getDeclaredConstructor().newInstance();
148 } catch (final Exception e) {
149 final String errorMessage = "could not create default parameters for event protocol \""
150 + eventProtocolLabel + "\"\n" + e.getMessage();
151 LOGGER.warn(errorMessage, e);
152 throw new ParameterRuntimeException(errorMessage, e);
156 // Check that the event protocol label matches the label in the event protocol parameters
158 if (!eventProtocolParameters.getLabel().equals(eventProtocolLabel)) {
159 final String errorMessage = EVENT_PROTOCOL_PREFIX + eventProtocolLabel + "\" does not match plugin \""
160 + eventProtocolParameters.getLabel() + "\" in \"" + eventProtocolParameterClassName
161 + "\", specify correct event protocol parameter plugin in parameter \"" + PARAMETER_CLASS_NAME
163 LOGGER.warn(errorMessage);
164 throw new ParameterRuntimeException(errorMessage);
167 return eventProtocolParameters;