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
9 package org.opendaylight.yangtools.yang.parser.impl;
11 import com.google.common.base.Preconditions;
13 import java.net.URISyntaxException;
14 import java.util.ArrayList;
15 import java.util.List;
16 import javax.xml.stream.XMLStreamConstants;
17 import javax.xml.stream.XMLStreamException;
18 import javax.xml.stream.XMLStreamReader;
19 import org.opendaylight.yangtools.yang.common.QName;
20 import org.opendaylight.yangtools.yang.common.YangConstants;
21 import org.opendaylight.yangtools.yang.model.api.Rfc6020Mapping;
22 import org.opendaylight.yangtools.yang.model.api.meta.StatementDefinition;
23 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase;
24 import org.opendaylight.yangtools.yang.parser.spi.meta.StatementSupport;
25 import org.opendaylight.yangtools.yang.parser.spi.source.DeclarationInTextSource;
26 import org.opendaylight.yangtools.yang.parser.spi.source.PrefixToModule;
27 import org.opendaylight.yangtools.yang.parser.spi.source.QNameToStatementDefinition;
28 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
29 import org.opendaylight.yangtools.yang.parser.spi.source.StatementSourceReference;
30 import org.opendaylight.yangtools.yang.parser.spi.source.StatementWriter;
31 import org.opendaylight.yangtools.yang.parser.stmt.rfc6020.TypeUtils;
32 import org.opendaylight.yangtools.yang.parser.stmt.rfc6020.Utils;
33 import org.slf4j.Logger;
34 import org.slf4j.LoggerFactory;
36 public class YinStatementParserImpl {
38 private static final Logger LOG = LoggerFactory.getLogger(YinStatementParserImpl.class);
40 private StatementWriter writer;
41 private QNameToStatementDefinition stmtDef;
42 private PrefixToModule prefixes;
43 private final String sourceName;
44 private String uriStr;
45 private boolean isType = false;
46 private boolean action = true;
47 private boolean yinElement = false;
48 private List<String> toBeSkipped = new ArrayList<>();
50 public YinStatementParserImpl(String sourceName) {
51 this.sourceName = Preconditions.checkNotNull(sourceName);
56 * This method is supposed to be called in linkage phase, when YinStatementParserImpl instance has already been
58 * When done, start walking through YIN source
61 * @param writer - instance of StatementWriter to emit declared statements
62 * @param stmtDef - map of valid statement definitions for linkage phase
65 public void setAttributes(StatementWriter writer, QNameToStatementDefinition stmtDef) {
67 this.stmtDef = stmtDef;
72 * This method is supposed to be called in any phase but linkage, when YinStatementParserImpl instance has already
74 * When done, start walking through YIN source
76 * @param writer - instance of StatementWriter to emit declared statements
77 * @param stmtDef - map of valid statement definitions for any phase but linkage
78 * @param prefixes - map of valid prefixes for any phase but linkage
81 public void setAttributes(StatementWriter writer, QNameToStatementDefinition stmtDef, PrefixToModule prefixes) {
83 this.stmtDef = stmtDef;
84 this.prefixes = prefixes;
89 * This method executes parsing YIN source and emitting declared statements via attached StatementWriter
91 * @param inputReader - instance of XMlStreamReader, allows forward, read-only access to XML.
94 public void walk(XMLStreamReader inputReader) {
96 while (inputReader.hasNext()) {
98 if (inputReader.hasName() && inputReader.getEventType() == XMLStreamConstants.START_ELEMENT) {
99 enterStatement(inputReader);
102 if (inputReader.hasName() && inputReader.getEventType() == XMLStreamConstants.END_ELEMENT) {
103 exitStatement(inputReader);
106 } catch (XMLStreamException e) {
107 LOG.warn("Fatal error detecting the next state of XMLStreamReader", e);
108 } catch (URISyntaxException e) {
109 LOG.warn("Given string {} violates RFC2396", uriStr, e);
113 private void startStatement(QName identifier, StatementSourceReference ref) {
114 writer.startStatement(identifier, ref);
117 private void argumentValue(XMLStreamReader inputReader, StatementSourceReference ref, QName identifier, boolean
120 writeTextOnlyElement(inputReader, ref);
122 writeNormalizedAttributeValue(inputReader, identifier, ref);
126 private void endStatement(StatementSourceReference ref) {
127 writer.endStatement(ref);
130 private void enterStatement(XMLStreamReader inputReader) throws URISyntaxException {
131 final StatementSourceReference ref = DeclarationInTextSource.atPosition(sourceName, inputReader
132 .getLocation().getLineNumber(), inputReader.getLocation().getColumnNumber());
133 uriStr = inputReader.getNamespaceURI();
134 final QName identifier = new QName(new URI(uriStr), getElementFullName(inputReader));
135 if (yinElement && toBeSkipped.isEmpty()) {
136 //at yin element, it has be read as argument
137 argumentValue(inputReader, ref, identifier, true);
139 if (isStatementWithYinElement(identifier, stmtDef)) {
140 //at statement with yin element, so next statement will be read as argument
144 final QName validStatementDefinition = Utils.getValidStatementDefinition(prefixes, stmtDef, identifier);
146 //main part -> valid statement for actual phase
147 if (stmtDef != null && validStatementDefinition != null && toBeSkipped.isEmpty()) {
148 if (identifier.equals(Rfc6020Mapping.TYPE.getStatementName())) {
151 startStatement(validStatementDefinition, ref);
152 if (isStatementWithYinElement(identifier, stmtDef)) {
157 //if statement not found through all phases, throw exception
158 if (writer.getPhase().equals(ModelProcessingPhase.FULL_DECLARATION)) {
159 throw new SourceException(String.format("%s is not a YIN statement or use of extension.",
160 identifier.getLocalName()), ref);
162 //otherwise skip it (statement not to be read yet)
164 toBeSkipped.add(getElementFullName(inputReader));
169 writeTypeStmtAndArg(inputReader, identifier, ref);
170 } else if (action & isStatementWithArgument(identifier, stmtDef)) {
171 argumentValue(inputReader, ref, identifier, false);
178 private void exitStatement(XMLStreamReader inputReader) throws URISyntaxException {
179 final String statementName = getElementFullName(inputReader);
180 final QName identifier = new QName(new URI(inputReader.getNamespaceURI()), statementName);
181 final StatementSourceReference ref = DeclarationInTextSource.atPosition(sourceName, inputReader
182 .getLocation().getLineNumber(), inputReader.getLocation().getColumnNumber());
183 final QName validStatementDefinition = Utils.getValidStatementDefinition(prefixes, stmtDef, identifier);
185 if ((stmtDef != null && validStatementDefinition != null && toBeSkipped.isEmpty()) && !yinElement) {
189 //back to normal mode
194 if (toBeSkipped.contains(statementName)) {
195 toBeSkipped.remove(statementName);
199 private void writeTextOnlyElement(XMLStreamReader inputReader, StatementSourceReference ref) {
201 writer.argumentValue(inputReader.getElementText(), ref);
202 } catch (XMLStreamException e) {
203 LOG.warn("Current event is not a START_ELEMENT or a non text element is encountered ", ref, e);
207 private void writeNormalizedAttributeValue(XMLStreamReader inputReader, QName
208 identifier, StatementSourceReference ref) {
209 final String attributeValue = getAttributeValue(inputReader, identifier, stmtDef);
210 if (attributeValue != null)
211 writer.argumentValue(attributeValue, ref);
214 private void writeTypeStmtAndArg(XMLStreamReader inputReader, QName identifier, StatementSourceReference ref) {
215 String argument = getAttributeValue(inputReader, identifier, stmtDef);
216 if (TypeUtils.isYangTypeBodyStmtString(argument)) {
217 startStatement(new QName(YangConstants.RFC6020_YIN_NAMESPACE, argument), ref);
219 startStatement(new QName(YangConstants.RFC6020_YIN_NAMESPACE, Rfc6020Mapping
220 .TYPE.getStatementName().getLocalName()), ref);
222 argumentValue(inputReader, ref, identifier, false);
226 private static String getElementFullName(XMLStreamReader inputReader) {
227 if (!inputReader.getPrefix().isEmpty()) {
228 return inputReader.getPrefix() + ":" + inputReader.getLocalName();
230 return inputReader.getLocalName();
234 private static boolean isStatementWithArgument(QName identifier, QNameToStatementDefinition stmtDef) {
235 if (stmtDef != null && stmtDef.get(Utils.trimPrefix(identifier)) == null) {
237 } else if (((StatementSupport) stmtDef.get(Utils.trimPrefix(identifier)))
238 .getPublicView().getArgumentName() == null) {
244 private static boolean isStatementWithYinElement(QName identifier, QNameToStatementDefinition stmtDef) {
245 final StatementDefinition statementDefinition = stmtDef.get(Utils.trimPrefix(identifier));
246 if (statementDefinition != null) {
247 return ((Rfc6020Mapping) ((StatementSupport) statementDefinition).getPublicView()).isArgumentYinElement();
253 private static String getAttributeValue(XMLStreamReader inputReader, QName identifier, QNameToStatementDefinition
255 String namespace = null;
256 return inputReader.getAttributeValue(namespace, (((StatementSupport) stmtDef.get(Utils.trimPrefix(identifier)))
257 .getPublicView()).getArgumentName().getLocalName());