2 * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.yangtools.yang.model.repo.api;
10 import static com.google.common.base.Preconditions.checkArgument;
11 import static java.util.Objects.requireNonNull;
12 import static org.opendaylight.yangtools.yang.common.YangConstants.RFC6020_YIN_MODULE;
13 import static org.opendaylight.yangtools.yang.model.api.YangStmtMapping.MODULE;
14 import static org.opendaylight.yangtools.yang.model.api.YangStmtMapping.REVISION;
15 import static org.opendaylight.yangtools.yang.model.api.YangStmtMapping.SUBMODULE;
17 import com.google.common.base.MoreObjects;
18 import com.google.common.base.MoreObjects.ToStringHelper;
19 import java.util.Optional;
20 import javax.xml.transform.Source;
21 import javax.xml.transform.TransformerException;
22 import javax.xml.transform.TransformerFactory;
23 import javax.xml.transform.dom.DOMResult;
24 import javax.xml.transform.dom.DOMSource;
25 import org.eclipse.jdt.annotation.NonNull;
26 import org.eclipse.jdt.annotation.Nullable;
27 import org.opendaylight.yangtools.yang.common.QName;
28 import org.opendaylight.yangtools.yang.common.Revision;
29 import org.opendaylight.yangtools.yang.common.YangConstants;
30 import org.slf4j.Logger;
31 import org.slf4j.LoggerFactory;
32 import org.w3c.dom.Attr;
33 import org.w3c.dom.Element;
34 import org.w3c.dom.Node;
35 import org.w3c.dom.NodeList;
38 * Utility {@link YinXmlSchemaSource} exposing a W3C {@link DOMSource} representation of YIN model.
40 public abstract class YinDomSchemaSource implements YinXmlSchemaSource {
41 private static final Logger LOG = LoggerFactory.getLogger(YinDomSchemaSource.class);
42 private static final TransformerFactory TRANSFORMER_FACTORY = TransformerFactory.newInstance();
43 private static final QName REVISION_STMT = REVISION.getStatementName();
44 private static final String MODULE_ARG = MODULE.getArgumentDefinition().get().getArgumentName().getLocalName();
45 private static final String REVISION_ARG = REVISION.getArgumentDefinition().get().getArgumentName().getLocalName();
47 YinDomSchemaSource() {
48 // Prevent outside instantiation
52 * Create a new {@link YinDomSchemaSource} using an identifier and a source.
54 * @param identifier Schema source identifier
55 * @param source W3C DOM source
56 * @param symbolicName Source symbolic name
57 * @return A new {@link YinDomSchemaSource} instance.
59 public static @NonNull YinDomSchemaSource create(final @NonNull SourceIdentifier identifier,
60 final @NonNull DOMSource source, final @Nullable String symbolicName) {
62 final Node root = source.getNode().getFirstChild();
63 final String rootNs = root.getNamespaceURI();
65 // Let whoever is using this deal with this
66 return new Simple(identifier, source, symbolicName);
69 final QName qname = QName.create(rootNs, root.getLocalName());
70 checkArgument(RFC6020_YIN_MODULE.equals(qname.getModule()),
71 "Root node namepsace %s does not match %s", rootNs, YangConstants.RFC6020_YIN_NAMESPACE);
72 checkArgument(MODULE.getStatementName().equals(qname)
73 || SUBMODULE.getStatementName().equals(qname), "Root element %s is not a module nor a submodule", qname);
75 checkArgument(root instanceof Element, "Root node %s is not an element", root);
76 final Element element = (Element)root;
78 final Attr nameAttr = element.getAttributeNode(MODULE_ARG);
79 checkArgument(nameAttr != null, "No %s name argument found in %s", element.getLocalName());
81 final NodeList revisions = element.getElementsByTagNameNS(REVISION_STMT.getNamespace().toString(),
82 REVISION_STMT.getLocalName());
83 if (revisions.getLength() == 0) {
84 // FIXME: is module name important (as that may have changed)
85 return new Simple(identifier, source, symbolicName);
88 final Element revisionStmt = (Element) revisions.item(0);
89 final Attr dateAttr = revisionStmt.getAttributeNode(REVISION_ARG);
90 checkArgument(dateAttr != null, "No revision statement argument found in %s", revisionStmt);
92 final SourceIdentifier parsedId = RevisionSourceIdentifier.create(nameAttr.getValue(),
93 Revision.of(dateAttr.getValue()));
94 final SourceIdentifier id;
95 if (!parsedId.equals(identifier)) {
96 LOG.debug("Changed identifier from {} to {}", identifier, parsedId);
102 return new Simple(id, source, symbolicName);
106 * Create a {@link YinDomSchemaSource} from a {@link YinXmlSchemaSource}. If the argument is already a
107 * YinDomSchemaSource, this method returns the same instance. The source will be translated on first access,
108 * at which point an {@link IllegalStateException} may be raised.
110 * @param xmlSchemaSource Backing schema source
111 * @return A {@link YinDomSchemaSource} instance
113 public static @NonNull YinDomSchemaSource lazyTransform(final YinXmlSchemaSource xmlSchemaSource) {
114 final YinDomSchemaSource cast = castSchemaSource(xmlSchemaSource);
115 return cast != null ? cast : new Transforming(xmlSchemaSource);
119 * Create a {@link YinDomSchemaSource} from a {@link YinXmlSchemaSource}. If the argument is already a
120 * YinDomSchemaSource, this method returns the same instance. The source will be translated immediately.
122 * @param xmlSchemaSource Backing schema source
123 * @return A {@link YinDomSchemaSource} instance
124 * @throws TransformerException when the provided source fails to transform
126 public static @NonNull YinDomSchemaSource transform(final YinXmlSchemaSource xmlSchemaSource)
127 throws TransformerException {
128 final YinDomSchemaSource cast = castSchemaSource(xmlSchemaSource);
129 return cast != null ? cast :
130 create(xmlSchemaSource.getIdentifier(), transformSource(xmlSchemaSource.getSource()),
131 xmlSchemaSource.getSymbolicName().orElse(null));
135 public abstract DOMSource getSource();
138 public final Class<? extends YinXmlSchemaSource> getType() {
139 return YinDomSchemaSource.class;
143 public final String toString() {
144 return addToStringAttributes(MoreObjects.toStringHelper(this).add("identifier", getIdentifier())).toString();
148 * Add subclass-specific attributes to the output {@link #toString()} output. Since
149 * subclasses are prevented from overriding {@link #toString()} for consistency
150 * reasons, they can add their specific attributes to the resulting string by attaching
151 * attributes to the supplied {@link ToStringHelper}.
153 * @param toStringHelper ToStringHelper onto the attributes can be added
154 * @return ToStringHelper supplied as input argument.
156 protected abstract ToStringHelper addToStringAttributes(ToStringHelper toStringHelper);
158 static @NonNull DOMSource transformSource(final Source source) throws TransformerException {
159 final DOMResult result = new DOMResult();
160 TRANSFORMER_FACTORY.newTransformer().transform(source, result);
162 return new DOMSource(result.getNode(), result.getSystemId());
165 private static @Nullable YinDomSchemaSource castSchemaSource(final YinXmlSchemaSource xmlSchemaSource) {
166 if (xmlSchemaSource instanceof YinDomSchemaSource) {
167 return (YinDomSchemaSource) xmlSchemaSource;
170 final Source source = xmlSchemaSource.getSource();
171 if (source instanceof DOMSource) {
172 return create(xmlSchemaSource.getIdentifier(), (DOMSource) source,
173 xmlSchemaSource.getSymbolicName().orElse(null));
179 private static final class Simple extends YinDomSchemaSource {
180 private final @NonNull SourceIdentifier identifier;
181 private final @NonNull DOMSource source;
182 private final String symbolicName;
184 Simple(final @NonNull SourceIdentifier identifier, final @NonNull DOMSource source,
185 final @Nullable String symbolicName) {
186 this.identifier = requireNonNull(identifier);
187 this.source = requireNonNull(source);
188 this.symbolicName = symbolicName;
192 public DOMSource getSource() {
197 public SourceIdentifier getIdentifier() {
202 public Optional<String> getSymbolicName() {
203 return Optional.ofNullable(symbolicName);
207 protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
208 return toStringHelper.add("source", source);
212 private static final class Transforming extends YinDomSchemaSource {
213 private final YinXmlSchemaSource xmlSchemaSource;
214 private volatile DOMSource source;
216 Transforming(final YinXmlSchemaSource xmlSchemaSource) {
217 this.xmlSchemaSource = requireNonNull(xmlSchemaSource);
221 public DOMSource getSource() {
222 DOMSource ret = source;
224 synchronized (this) {
228 ret = transformSource(xmlSchemaSource.getSource());
229 } catch (TransformerException e) {
230 throw new IllegalStateException("Failed to transform schema source " + xmlSchemaSource, e);
241 public SourceIdentifier getIdentifier() {
242 return xmlSchemaSource.getIdentifier();
246 public Optional<String> getSymbolicName() {
247 return xmlSchemaSource.getSymbolicName();
251 protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
252 return toStringHelper.add("xmlSchemaSource", xmlSchemaSource);