2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
6 * Copyright © 2017-2018 European Software Marketing Ltd.
7 * ================================================================================
8 * Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
12 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 * ============LICENSE_END=========================================================
21 package org.onap.aai.modelloader.entity.model;
23 import java.io.StringReader;
24 import java.util.ArrayList;
25 import java.util.List;
26 import java.util.Objects;
27 import java.util.function.BiConsumer;
28 import java.util.stream.Collector;
29 import java.util.stream.IntStream;
30 import javax.xml.parsers.DocumentBuilder;
31 import javax.xml.parsers.DocumentBuilderFactory;
32 import org.onap.aai.cl.api.Logger;
33 import org.onap.aai.cl.eelf.LoggerFactory;
34 import org.onap.aai.modelloader.entity.Artifact;
35 import org.onap.aai.modelloader.service.ModelLoaderMsgs;
36 import org.w3c.dom.Document;
37 import org.w3c.dom.Element;
38 import org.w3c.dom.Node;
39 import org.w3c.dom.NodeList;
40 import org.xml.sax.InputSource;
43 * This class provides common behaviour for implementations of IModelParser.
45 * Some of the common behaviour takes the form of abstract methods that will be implemented in concrete classes.
47 * Some other behaviour will be overridden in concrete classes.
49 public abstract class AbstractModelArtifactParser implements IModelParser {
50 private static Logger logger = LoggerFactory.getInstance().getLogger(AbstractModelArtifactParser.class);
52 protected static final String RELATIONSHIP_DATA = "relationship-data";
53 private static final String RELATIONSHIP_KEY = "relationship-key";
54 private static final String RELATIONSHIP_VALUE = "relationship-value";
56 BiConsumer<Pair<String, String>, Node> applyRelationshipValue = (p, n) -> {
57 if (n.getNodeName().equalsIgnoreCase(RELATIONSHIP_KEY)) {
58 p.setKey(n.getTextContent().trim());
60 p.setValue(n.getTextContent().trim());
66 * This method is responsible for parsing the payload to produce a list of artifacts.
68 * @param artifactPayload the payload to be parsed
69 * @param artifactName the name of the artifact to be parsed
70 * @return List<Artifact> a list of artifacts that have been parsed from the payload.
73 public List<Artifact> parse(String artifactPayload, String artifactName) {
74 List<Artifact> modelList = new ArrayList<>();
77 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
78 factory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
79 DocumentBuilder builder = factory.newDocumentBuilder();
80 InputSource is = new InputSource(new StringReader(artifactPayload));
81 Document doc = builder.parse(is);
83 IModelArtifact model = parseModel(doc.getDocumentElement(), artifactPayload);
85 boolean success = processParsedModel(modelList, artifactName, model);
89 } catch (Exception ex) {
90 logger.error(ModelLoaderMsgs.ARTIFACT_PARSE_ERROR,
91 buildArtifactParseExceptionMessage(artifactName, ex.getLocalizedMessage()));
97 private IModelArtifact parseModel(Node modelNode, String payload) {
98 IModelArtifact model = createModelArtifactInstance();
99 model.setPayload(payload);
101 Element e = (Element) modelNode;
102 model.setModelNamespace(e.getAttribute("xmlns"));
104 parseNode(modelNode, model);
106 return modelIsValid(model) ? model : null;
110 * This method is responsible for creating a new instance of IModel that represents the model id for a concrete
111 * implementation of IArtifactParser.
113 * @return IModelArtifact implementation of IModel that represents the model id for a concrete implementation of
116 abstract IModelArtifact createModelArtifactInstance();
119 * This method is responsible for the actual parsing of a node.
121 * It will do one of three things:
123 * <li>set the version id if the name of the node is the same as the name of the node that is the version Id</li>
124 * <li>if the node is contains data about the relationship it will parse the node accordingly</li>
125 * <li>if it does neither of option 1 or 2 it will parse the children of this node</li>
128 * @param node node to be parsed
129 * @param model the model artifact to be updated with either the versionId or details of dependent node
131 void parseNode(Node node, IModelArtifact model) {
132 if (node.getNodeName().equalsIgnoreCase(getVersionIdNodeName())) {
133 setVersionId(model, node);
134 } else if (node.getNodeName().equalsIgnoreCase(RELATIONSHIP_DATA)) {
135 parseRelationshipNode(node, model);
137 parseChildNodes(node, model);
142 * This method gets the name of the node that acts as the version Id for the node.
144 * @return String name of the node that acts as the version Id for the node
146 abstract String getVersionIdNodeName();
149 * This method is responsible for setting the values on the model artifact that represent the version Id. Each
150 * implementation of a IModelArtifact has its own properties that define the version Id.
152 * @param model the model artifact upon which the version Id will be set
153 * @param node the source of the data that holds the actual value of the version id to be set on the model artifact
155 abstract void setVersionId(IModelArtifact model, Node node);
158 * @param relationshipNode a node containing child nodes storing relationship data
159 * @param model artifact whose dependent node id will be update with any relationship data if it exists
161 void parseRelationshipNode(Node relationshipNode, IModelArtifact model) {
162 NodeList nodeList = getChildNodes(relationshipNode);
164 IModelId modelId = buildModelId(nodeList);
166 updateModelsDependentNodeId(model, modelId);
169 private NodeList getChildNodes(Node relationshipNode) {
170 Objects.requireNonNull(relationshipNode);
171 NodeList nodeList = relationshipNode.getChildNodes();
172 Objects.requireNonNull(nodeList);
178 * This method is responsible for building an instance of IModelId representing the id of the model.
180 * @param nodeList list of modes used to build the model id.
181 * @return IModelId instance of IModelId representing the id of the model
183 IModelId buildModelId(NodeList nodeList) {
184 Pair<String, String> relationship = IntStream.range(0, nodeList.getLength()).mapToObj(nodeList::item) //
185 .filter(this::filterRelationshipNode)
186 .collect(Collector.of(Pair::new, applyRelationshipValue, (p, n) -> p));
188 IModelId modelId = createModelIdInstance();
189 modelId.setRelationship(relationship);
195 * This method tests if a node is either one that either represents a relationship key or a relationship value.
197 * @param n the node to to be tested
198 * @return <code>true</code> if the node is either represents a relationship key or a relationship value
200 boolean filterRelationshipNode(Node n) {
201 return n.getNodeName().equalsIgnoreCase(RELATIONSHIP_KEY)
202 || n.getNodeName().equalsIgnoreCase(RELATIONSHIP_VALUE);
206 * This method is responsible for creating an instance of {@link AbstractModelArtifactParser.ModelId}
208 * @return IModelId instance of {@link AbstractModelArtifactParser.ModelId}
210 IModelId createModelIdInstance() {
211 return new ModelId();
214 private void updateModelsDependentNodeId(IModelArtifact model, IModelId modelId) {
215 if (modelId.defined()) {
216 model.addDependentModelId(modelId.toString());
221 * This method is responsible for parsing the children of a given node.
223 * @param node node whose children, if any, should be parsed.
224 * @param model model to be updated as a result of parsing the node
226 void parseChildNodes(Node node, IModelArtifact model) {
227 NodeList nodeList = node.getChildNodes();
228 for (int i = 0; i < nodeList.getLength(); i++) {
229 Node childNode = nodeList.item(i);
230 parseNode(childNode, model);
235 * Validates if the mode is valid or not by examining specific properties of the model.
237 * @param model model to be validated
238 * @return <code>true</code> if the mode is valid otherwise <code>false</code>
240 abstract boolean modelIsValid(IModelArtifact model);
243 * This method is responsible for building a message used for logging artifact parsing errors.
245 * @param artifactName the name of the artifact
246 * @param localisedMessage the message associated with the exception that is raised by the error
247 * @return String a message used for logging artifact parsing errors
249 abstract String buildArtifactParseExceptionMessage(String artifactName, String localisedMessage);
252 * This method is responsible for either adding the model artifact to the list of model artifacts or reporting an
255 * If the model is not null then it will be added to the list of artifacts otherwise an error will be logged.
257 * @param modelList the list of artifacts to which the model will be added if it is not null
258 * @param artifactName the name of the artifact
259 * @param artifactModel the model artifact to be added to the list of model artifacts
260 * @return <code>true/code> if the model is not null otherwise <code>false</code>
262 abstract boolean processParsedModel(List<Artifact> modelList, String artifactName, IModelArtifact artifactModel);
264 private class ModelId implements IModelId {
265 private String modelIdValue;
268 public void setRelationship(Pair<String, String> p) {
269 if (getModelElementRelationshipKey().equals(p.getKey())) {
270 modelIdValue = p.getValue();
275 public boolean defined() {
276 return modelIdValue != null;
280 public String toString() {
286 * This method gets the name of the key of the element relationship for the model.
288 * @return String name of the key of the element relationship for the model
290 abstract String getModelElementRelationshipKey();