Merge "Migrate NetconfHelloMessage's use of Optional"
[netconf.git] / netconf / netconf-monitoring / src / main / java / org / opendaylight / netconf / monitoring / GetSchema.java
1 /*
2  * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
3  *
4  * This program and the accompanying materials are made available under the
5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6  * and is available at http://www.eclipse.org/legal/epl-v10.html
7  */
8 package org.opendaylight.netconf.monitoring;
9
10 import java.util.HashMap;
11 import java.util.Map;
12 import java.util.Optional;
13 import org.opendaylight.netconf.api.DocumentedException;
14 import org.opendaylight.netconf.api.monitoring.NetconfMonitoringService;
15 import org.opendaylight.netconf.api.xml.XmlElement;
16 import org.opendaylight.netconf.api.xml.XmlNetconfConstants;
17 import org.opendaylight.netconf.api.xml.XmlUtil;
18 import org.opendaylight.netconf.util.mapping.AbstractSingletonNetconfOperation;
19 import org.slf4j.Logger;
20 import org.slf4j.LoggerFactory;
21 import org.w3c.dom.Document;
22 import org.w3c.dom.Element;
23
24 public class GetSchema extends AbstractSingletonNetconfOperation {
25     public static final String GET_SCHEMA = "get-schema";
26     public static final String IDENTIFIER = "identifier";
27     public static final String VERSION = "version";
28
29     private static final Logger LOG = LoggerFactory.getLogger(GetSchema.class);
30     private final NetconfMonitoringService cap;
31
32     public GetSchema(final NetconfMonitoringService cap) {
33         super(MonitoringConstants.MODULE_NAME);
34         this.cap = cap;
35     }
36
37     @Override
38     protected String getOperationName() {
39         return GET_SCHEMA;
40     }
41
42     @Override
43     protected String getOperationNamespace() {
44         return XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_YANG_IETF_NETCONF_MONITORING;
45     }
46
47     @Override
48     protected Element handleWithNoSubsequentOperations(final Document document, final XmlElement xml)
49             throws DocumentedException {
50         final GetSchemaEntry entry;
51
52         entry = new GetSchemaEntry(xml);
53
54         final String schema;
55         try {
56             schema = cap.getSchemaForCapability(entry.identifier, entry.version);
57         } catch (final IllegalStateException e) {
58             final Map<String, String> errorInfo = new HashMap<>();
59             errorInfo.put(DocumentedException.ErrorTag.OPERATION_FAILED.toString(), e.getMessage());
60             LOG.warn("Rpc error: {}", DocumentedException.ErrorTag.OPERATION_FAILED, e);
61             throw new DocumentedException(e.getMessage(), e, DocumentedException.ErrorType.APPLICATION,
62                     DocumentedException.ErrorTag.OPERATION_FAILED,
63                     DocumentedException.ErrorSeverity.ERROR, errorInfo);
64         }
65
66         final Element getSchemaResult;
67         getSchemaResult = XmlUtil.createTextElement(document, XmlNetconfConstants.DATA_KEY, schema,
68                 Optional.of(XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_YANG_IETF_NETCONF_MONITORING));
69         LOG.trace("{} operation successful", GET_SCHEMA);
70
71         return getSchemaResult;
72     }
73
74     private static final class GetSchemaEntry {
75         private final String identifier;
76         private final Optional<String> version;
77
78         GetSchemaEntry(final XmlElement getSchemaElement) throws DocumentedException {
79             getSchemaElement.checkName(GET_SCHEMA);
80             getSchemaElement.checkNamespace(XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_YANG_IETF_NETCONF_MONITORING);
81
82             XmlElement identifierElement = null;
83             try {
84                 identifierElement = getSchemaElement.getOnlyChildElementWithSameNamespace(IDENTIFIER);
85             } catch (final DocumentedException e) {
86                 LOG.trace("Can't get identifier element as only child element with same namespace due to ", e);
87                 throw DocumentedException.wrap(e);
88             }
89             identifier = identifierElement.getTextContent();
90             final Optional<XmlElement> versionElement = getSchemaElement
91                     .getOnlyChildElementWithSameNamespaceOptionally(VERSION);
92             if (versionElement.isPresent()) {
93                 version = Optional.of(versionElement.get().getTextContent());
94             } else {
95                 version = Optional.empty();
96             }
97         }
98     }
99 }