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.export;
10 import static com.google.common.base.Preconditions.checkArgument;
11 import static java.util.Objects.requireNonNull;
13 import com.google.common.annotations.Beta;
14 import java.io.OutputStream;
15 import java.util.Optional;
16 import javax.xml.stream.XMLEventReader;
17 import javax.xml.stream.XMLStreamException;
18 import javax.xml.transform.OutputKeys;
19 import javax.xml.transform.Transformer;
20 import javax.xml.transform.TransformerException;
21 import javax.xml.transform.TransformerFactory;
22 import javax.xml.transform.stax.StAXSource;
23 import javax.xml.transform.stream.StreamResult;
24 import org.opendaylight.yangtools.yang.common.Revision;
25 import org.opendaylight.yangtools.yang.common.YangConstants;
26 import org.opendaylight.yangtools.yang.model.api.Module;
27 import org.opendaylight.yangtools.yang.model.api.stmt.ModuleEffectiveStatement;
28 import org.opendaylight.yangtools.yang.model.api.stmt.SubmoduleEffectiveStatement;
30 public final class YinExportUtils {
31 private static final TransformerFactory TRANSFORMER_FACTORY = TransformerFactory.newInstance();
33 private YinExportUtils() {
38 * Returns well-formed file name of YIN file as defined in RFC6020.
40 * @param name Module or submodule name
41 * @param revision Revision of module or submodule
42 * @return well-formed file name of YIN file as defined in RFC6020.
44 public static String wellFormedYinName(final String name, final Optional<Revision> revision) {
45 return wellFormedYinName(name, revision.map(Revision::toString).orElse(null));
49 * Returns well-formed file name of YIN file as defined in RFC6020.
51 * @param name name Module or submodule name
52 * @param revision Revision of module or submodule
53 * @return well-formed file name of YIN file as defined in RFC6020.
55 public static String wellFormedYinName(final String name, final String revision) {
56 if (revision == null) {
57 return name + YangConstants.RFC6020_YIN_FILE_EXTENSION;
59 return requireNonNull(name) + '@' + revision + YangConstants.RFC6020_YIN_FILE_EXTENSION;
63 * Write a module as a YIN text into specified {@link OutputStream}. Supplied module must have the
64 * {@link ModuleEffectiveStatement} trait.
66 * @param module Module to be exported
67 * @throws IllegalArgumentException if the module is not an ModuleEffectiveStatement or if it declared
68 * representation is not available.
69 * @throws NullPointerException if any of of the parameters is null
70 * @throws XMLStreamException if an input-output error occurs
73 public static void writeModuleAsYinText(final Module module, final OutputStream output) throws XMLStreamException {
74 requireNonNull(module);
75 checkArgument(module instanceof ModuleEffectiveStatement, "Module %s is not a ModuleEffectiveStatement",
77 final ModuleEffectiveStatement effective = (ModuleEffectiveStatement) module;
78 writeReaderToOutput(YinXMLEventReaderFactory.defaultInstance().createXMLEventReader(effective), output);
82 * Write a submodule as a YIN text into specified {@link OutputStream}. Supplied submodule must have the
83 * {@link SubmoduleEffectiveStatement} trait.
85 * @param parentModule Parent module
86 * @param submodule Submodule to be exported
87 * @throws IllegalArgumentException if the parent module is not a ModuleEffectiveStatement, if the submodule is not
88 * a SubmoduleEffectiveStatement or if its declared representation is not available
89 * @throws NullPointerException if any of of the parameters is null
90 * @throws XMLStreamException if an input-output error occurs
93 public static void writeSubmoduleAsYinText(final Module parentModule, final Module submodule,
94 final OutputStream output) throws XMLStreamException {
95 requireNonNull(parentModule);
96 checkArgument(parentModule instanceof ModuleEffectiveStatement, "Parent %s is not a ModuleEffectiveStatement",
98 requireNonNull(submodule);
99 checkArgument(submodule instanceof SubmoduleEffectiveStatement,
100 "Submodule %s is not a SubmoduleEffectiveStatement", submodule);
101 writeReaderToOutput(YinXMLEventReaderFactory.defaultInstance().createXMLEventReader(
102 (ModuleEffectiveStatement) parentModule, (SubmoduleEffectiveStatement)submodule), output);
105 private static void writeReaderToOutput(final XMLEventReader reader, final OutputStream output)
106 throws XMLStreamException {
108 final Transformer transformer = TRANSFORMER_FACTORY.newTransformer();
109 transformer.setOutputProperty(OutputKeys.INDENT, "yes");
110 transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
111 transformer.transform(new StAXSource(reader), new StreamResult(output));
112 } catch (TransformerException e) {
113 throw new XMLStreamException("Failed to stream XML events", e);