2 * Copyright (c) 2016 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.restconf.parser.builder;
10 import com.google.common.base.CharMatcher;
11 import com.google.common.base.Preconditions;
12 import com.google.common.collect.ImmutableList;
13 import com.google.common.collect.ImmutableMap;
14 import java.util.LinkedList;
15 import java.util.List;
16 import org.opendaylight.restconf.utils.RestconfConstants;
17 import org.opendaylight.restconf.utils.parser.builder.ParserBuilderConstants;
18 import org.opendaylight.restconf.utils.schema.context.RestconfSchemaUtil;
19 import org.opendaylight.yangtools.yang.common.QName;
20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
21 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
22 import org.opendaylight.yangtools.yang.data.util.DataSchemaContextNode;
23 import org.opendaylight.yangtools.yang.data.util.DataSchemaContextTree;
24 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
25 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
26 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
27 import org.opendaylight.yangtools.yang.model.api.Module;
28 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
31 * Deserializer for {@link String} to {@link YangInstanceIdentifier} for
35 public final class YangInstanceIdentifierDeserializer {
37 private YangInstanceIdentifierDeserializer() {
38 throw new UnsupportedOperationException("Util class.");
42 * Method to create {@link Iterable} from {@link PathArgument} which are
43 * parsing from data by {@link SchemaContext}.
45 * @param schemaContext
46 * - for validate of parsing path arguments
49 * @return {@link Iterable} of {@link PathArgument}
51 public static Iterable<PathArgument> create(final SchemaContext schemaContext, final String data) {
52 final List<PathArgument> path = new LinkedList<>();
53 DataSchemaContextNode<?> current = DataSchemaContextTree.from(schemaContext).getRoot();
55 final MainVarsWrapper variables = new YangInstanceIdentifierDeserializer.MainVarsWrapper(data,
56 current, offset, schemaContext);
58 while (!allCharsConsumed(variables)) {
60 final QName qname = prepareQName(variables);
62 if (!allCharsConsumed(variables)
63 && (currentChar(variables.getOffset(), variables.getData()) == RestconfConstants.SLASH)) {
64 prepareIdentifier(qname, path, variables);
65 path.add(variables.getCurrent().getIdentifier());
66 } else if (!allCharsConsumed(variables)
67 && (currentChar(variables.getOffset(),
68 variables.getData()) == ParserBuilderConstants.Deserializer.EQUAL)) {
69 current = nextContextNode(qname, path, variables);
70 if (!current.isKeyedEntry()) {
71 prepareNodeWithValue(qname, path, variables);
73 prepareNodeWithPredicates(qname, path, variables);
76 throw new IllegalArgumentException(
77 "Bad char " + currentChar(offset, data) + " on position " + offset + ".");
80 return ImmutableList.copyOf(path);
83 private static void prepareNodeWithPredicates(final QName qname, final List<PathArgument> path,
84 final MainVarsWrapper variables) {
85 final List<QName> keyDefinitions = ((ListSchemaNode) variables.getCurrent().getDataSchemaNode())
87 final ImmutableMap.Builder<QName, Object> keyValues = ImmutableMap.builder();
89 for (final QName keyQName : keyDefinitions) {
90 skipCurrentChar(variables);
92 if ((currentChar(variables.getOffset(), variables.getData()) == ParserBuilderConstants.Deserializer.COMMA)
93 || (currentChar(variables.getOffset(), variables.getData()) == RestconfConstants.SLASH)) {
94 value = ParserBuilderConstants.Deserializer.EMPTY_STRING;
96 value = nextIdentifierFromNextSequence(ParserBuilderConstants.Deserializer.IDENTIFIER_PREDICATE,
99 value = findAndParsePercentEncoded(value);
100 keyValues.put(keyQName, value);
102 path.add(new YangInstanceIdentifier.NodeIdentifierWithPredicates(qname, keyValues.build()));
105 private static QName prepareQName(final MainVarsWrapper variables) {
107 ParserBuilderConstants.Deserializer.IDENTIFIER_FIRST_CHAR
108 .matches(currentChar(variables.getOffset(), variables.getData())),
109 "Identifier must start with character from set 'a-zA-Z_'", variables.getData(), variables.getOffset());
110 final String preparedPrefix = nextIdentifierFromNextSequence(ParserBuilderConstants.Deserializer.IDENTIFIER, variables);
111 final String prefix, localName;
113 switch (currentChar(variables.getOffset(), variables.getData())) {
114 case ParserBuilderConstants.Deserializer.COLON:
115 prefix = preparedPrefix;
116 skipCurrentChar(variables);
118 ParserBuilderConstants.Deserializer.IDENTIFIER_FIRST_CHAR
119 .matches(currentChar(variables.getOffset(), variables.getData())),
120 "Identifier must start with character from set 'a-zA-Z_'", variables.getData(),
121 variables.getOffset());
122 localName = nextIdentifierFromNextSequence(ParserBuilderConstants.Deserializer.IDENTIFIER, variables);
124 final Module module = moduleForPrefix(prefix, variables.getSchemaContext());
125 Preconditions.checkArgument(module != null, "Failed to lookup prefix %s", prefix);
127 return QName.create(module.getQNameModule(), localName);
128 case ParserBuilderConstants.Deserializer.EQUAL:
129 prefix = preparedPrefix;
130 return getQNameOfDataSchemaNode(prefix, variables);
132 throw new IllegalArgumentException("Failed build path.");
136 private static String nextIdentifierFromNextSequence(final CharMatcher matcher, final MainVarsWrapper variables) {
137 final int start = variables.getOffset();
138 nextSequenceEnd(matcher, variables);
139 return variables.getData().substring(start, variables.getOffset());
142 private static void nextSequenceEnd(final CharMatcher matcher, final MainVarsWrapper variables) {
143 while (!allCharsConsumed(variables)
144 && matcher.matches(variables.getData().charAt(variables.getOffset()))) {
145 variables.setOffset(variables.getOffset() + 1);
149 private static void prepareNodeWithValue(final QName qname, final List<PathArgument> path,
150 final MainVarsWrapper variables) {
151 skipCurrentChar(variables);
152 String value = nextIdentifierFromNextSequence(ParserBuilderConstants.Deserializer.IDENTIFIER, variables);
153 value = findAndParsePercentEncoded(value);
154 path.add(new YangInstanceIdentifier.NodeWithValue<>(qname, value));
157 private static void prepareIdentifier(final QName qname, final List<PathArgument> path,
158 final MainVarsWrapper variables) {
159 final DataSchemaContextNode<?> currentNode = nextContextNode(qname, path, variables);
160 checkValid(!currentNode.isKeyedEntry(), "Entry " + qname + " requires key or value predicate to be present",
161 variables.getData(), variables.getOffset());
164 private static DataSchemaContextNode<?> nextContextNode(final QName qname, final List<PathArgument> path,
165 final MainVarsWrapper variables) {
166 variables.setCurrent(variables.getCurrent().getChild(qname));
167 DataSchemaContextNode<?> current = variables.getCurrent();
168 checkValid(current != null, qname + " is not correct schema node identifier.", variables.getData(),
169 variables.getOffset());
170 while (current.isMixin()) {
171 path.add(current.getIdentifier());
172 current = current.getChild(qname);
173 variables.setCurrent(current);
178 private static String findAndParsePercentEncoded(String preparedPrefix) {
179 if (!preparedPrefix.contains(String.valueOf(ParserBuilderConstants.Deserializer.PERCENT_ENCODING))) {
180 return preparedPrefix;
182 final StringBuilder newPrefix = new StringBuilder();
185 int endPoint = preparedPrefix.length();
186 while ((i = preparedPrefix.indexOf(ParserBuilderConstants.Deserializer.PERCENT_ENCODING)) != -1) {
187 newPrefix.append(preparedPrefix.substring(startPoint, i));
190 final String hex = preparedPrefix.substring(startPoint, startPoint + 2);
192 newPrefix.append((char) Integer.parseInt(hex, 16));
193 preparedPrefix = preparedPrefix.substring(startPoint, endPoint);
195 endPoint = preparedPrefix.length();
197 return newPrefix.toString();
200 private static QName getQNameOfDataSchemaNode(final String nodeName, final MainVarsWrapper variables) {
201 final DataSchemaNode dataSchemaNode = variables.getCurrent().getDataSchemaNode();
202 if (dataSchemaNode instanceof ContainerSchemaNode) {
203 final ContainerSchemaNode contSchemaNode = (ContainerSchemaNode) dataSchemaNode;
204 final DataSchemaNode node = RestconfSchemaUtil.findSchemaNodeInCollection(contSchemaNode.getChildNodes(),
206 return node.getQName();
207 } else if (dataSchemaNode instanceof ListSchemaNode) {
208 final ListSchemaNode listSchemaNode = (ListSchemaNode) dataSchemaNode;
209 final DataSchemaNode node = RestconfSchemaUtil.findSchemaNodeInCollection(listSchemaNode.getChildNodes(),
211 return node.getQName();
213 throw new UnsupportedOperationException();
216 private static Module moduleForPrefix(final String prefix, final SchemaContext schemaContext) {
217 return schemaContext.findModuleByName(prefix, null);
220 private static void validArg(final MainVarsWrapper variables) {
221 checkValid(RestconfConstants.SLASH == currentChar(variables.getOffset(), variables.getData()),
222 "Identifier must start with '/'.", variables.getData(), variables.getOffset());
223 skipCurrentChar(variables);
224 checkValid(!allCharsConsumed(variables), "Identifier cannot end with '/'.",
225 variables.getData(), variables.getOffset());
228 private static void skipCurrentChar(final MainVarsWrapper variables) {
229 variables.setOffset(variables.getOffset() + 1);
232 private static char currentChar(final int offset, final String data) {
233 return data.charAt(offset);
236 private static void checkValid(final boolean condition, final String errorMsg, final String data,
238 Preconditions.checkArgument(condition, "Could not parse Instance Identifier '%s'. Offset: %s : Reason: %s",
239 data, offset, errorMsg);
242 private static boolean allCharsConsumed(final MainVarsWrapper variables) {
243 return variables.getOffset() == variables.getData().length();
246 private static class MainVarsWrapper {
248 private final SchemaContext schemaContext;
249 private final String data;
250 private DataSchemaContextNode<?> current;
253 public MainVarsWrapper(final String data, final DataSchemaContextNode<?> current, final int offset,
254 final SchemaContext schemaContext) {
256 this.schemaContext = schemaContext;
257 this.setCurrent(current);
258 this.setOffset(offset);
261 public String getData() {
265 public DataSchemaContextNode<?> getCurrent() {
269 public void setCurrent(final DataSchemaContextNode<?> current) {
270 this.current = current;
273 public int getOffset() {
277 public void setOffset(final int offset) {
278 this.offset = offset;
281 public SchemaContext getSchemaContext() {
282 return this.schemaContext;