[ONOS-4842] Leafref implementation for augment and uses
Change-Id: I919553a64d683aff65a8f16e2de783702dd5a45f
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UniqueListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UniqueListener.java
new file mode 100644
index 0000000..59920fe
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UniqueListener.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.UNIQUE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
+ .constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
+ .constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.removeQuotesAndHandleConcat;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * unique-stmt = unique-keyword sep unique-arg-str stmtend
+ *
+ * ANTLR grammar rule
+ * uniqueStatement: UNIQUE_KEYWORD unique STMTEND;
+ * unique : string;
+ */
+
+/**
+ * Represesnts listener based call back function corresponding to the "unique" rule
+ * defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class UniqueListener {
+
+ /**
+ * Creates a new unique listener.
+ */
+ private UniqueListener() {
+ }
+
+ /**
+ * It is called when parser receives an input matching the grammar rule
+ * (unique), perform validations and updates the data model tree.
+ *
+ * @param listener listener's object
+ * @param ctx context object of the grammar rule
+ */
+ public static void processUniqueEntry(TreeWalkListener listener,
+ GeneratedYangParser.UniqueStatementContext ctx) {
+
+ // Check for stack to be non empty.
+ checkStackIsNotEmpty(listener, MISSING_HOLDER, UNIQUE_DATA, ctx.unique().getText(), ENTRY);
+
+ Parsable tmpData = listener.getParsedDataStack().peek();
+ if (listener.getParsedDataStack().peek() instanceof YangList) {
+ YangList yangList = (YangList) tmpData;
+ String tmpUniqueValue = removeQuotesAndHandleConcat(ctx.unique().getText());
+
+ if (tmpUniqueValue.contains(" ")) {
+ String[] uniqueValues = tmpUniqueValue.split(" ");
+ for (String uniqueValue : uniqueValues) {
+ try {
+ yangList.addUnique(uniqueValue);
+ } catch (DataModelException e) {
+ throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+ UNIQUE_DATA,
+ ctx.unique().getText(), ENTRY, e.getMessage()));
+ }
+ }
+ } else {
+ try {
+ yangList.addUnique(tmpUniqueValue);
+ } catch (DataModelException e) {
+ throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA, UNIQUE_DATA,
+ ctx.unique().getText(), ENTRY, e.getMessage()));
+ }
+ }
+ } else {
+ throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, UNIQUE_DATA, ctx.unique().getText(),
+ ENTRY));
+ }
+ }
+}
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