[ONOS-4350] Inter Jar dependency implementation and code restructuring.
Change-Id: Iacac75e4187aed93ce1754c170a9c19707e5b8c3
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MandatoryListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MandatoryListener.java
new file mode 100644
index 0000000..b945f81
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MandatoryListener.java
@@ -0,0 +1,90 @@
+/*
+ * 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.YangLeaf;
+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.MANDATORY_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+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.ListenerUtil.getValidBooleanValue;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * mandatory-stmt = mandatory-keyword sep
+ * mandatory-arg-str stmtend
+ *
+ * mandatory-arg-str = < a string that matches the rule
+ * mandatory-arg >
+ *
+ * mandatory-arg = true-keyword / false-keyword
+ *
+ * ANTLR grammar rule
+ * mandatoryStatement : MANDATORY_KEYWORD mandatory STMTEND;
+ * mandatory : string;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "mandatory"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class MandatoryListener {
+
+ /**
+ * Creates a new mandatory listener.
+ */
+ private MandatoryListener() {
+ }
+
+ /**
+ * It is called when parser receives an input matching the grammar
+ * rule (mandatory), performs validation and updates the data model
+ * tree.
+ *
+ * @param listener listener's object
+ * @param ctx context object of the grammar rule
+ */
+ public static void processMandatoryEntry(TreeWalkListener listener,
+ GeneratedYangParser.MandatoryStatementContext ctx) {
+
+ // Check for stack to be non empty.
+ checkStackIsNotEmpty(listener, MISSING_HOLDER, MANDATORY_DATA, "", ENTRY);
+
+ boolean isMandatory = getValidBooleanValue(ctx.mandatory().getText(), MANDATORY_DATA, ctx);
+
+ Parsable tmpNode = listener.getParsedDataStack().peek();
+ switch (tmpNode.getYangConstructType()) {
+ case LEAF_DATA:
+ YangLeaf leaf = (YangLeaf) tmpNode;
+ leaf.setMandatory(isMandatory);
+ break;
+ case CHOICE_DATA: // TODO
+ break;
+ default:
+ throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, MANDATORY_DATA, "", ENTRY));
+ }
+ }
+}
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