[ONOS-3892,3895,3882,3883,3896]Implementation of yang container, list, leaf, leaf-list parser

Change-Id: Id51839bc434044be8273382f80f15b12f0ec8709
diff --git a/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ListListener.java b/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ListListener.java
index 7aceab6..82d69cb 100644
--- a/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ListListener.java
+++ b/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ListListener.java
@@ -16,8 +16,20 @@
 
 package org.onosproject.yangutils.parser.impl.listeners;
 
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.parser.Parsable;
+import org.onosproject.yangutils.parser.ParsableDataType;
 import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
 import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+import org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation;
+import org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction;
+import org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType;
+import org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation;
 
 /*
  * Reference: RFC6020 and YANG ANTLR Grammar
@@ -56,6 +68,8 @@
  */
 public final class ListListener {
 
+    private static ParsableDataType yangConstruct;
+
     /**
      * Creates a new list listener.
      */
@@ -72,7 +86,44 @@
      */
     public static void processListEntry(TreeWalkListener listener,
                                              GeneratedYangParser.ListStatementContext ctx) {
-        // TODO
+
+        YangNode curNode;
+
+        ListenerValidation.checkStackIsNotEmpty(listener, ListenerErrorType.MISSING_HOLDER,
+                ParsableDataType.LIST_DATA, String.valueOf(ctx.IDENTIFIER().getText()),
+                ListenerErrorLocation.ENTRY);
+
+        boolean result = validateSubStatementsCardinality(ctx);
+        if (!result) {
+            throw new ParserException(ListenerErrorMessageConstruction
+                    .constructListenerErrorMessage(ListenerErrorType.INVALID_CARDINALITY,
+                            yangConstruct, "", ListenerErrorLocation.ENTRY));
+        }
+
+        YangList yangList = new YangList(YangNodeType.LIST_NODE);
+        yangList.setName(ctx.IDENTIFIER().getText());
+
+        Parsable curData = listener.getParsedDataStack().peek();
+        if (curData instanceof YangNode) {
+            curNode = (YangNode) curData;
+            try {
+                curNode.addChild(yangList);
+            } catch (DataModelException e) {
+                throw new ParserException(ListenerErrorMessageConstruction
+                        .constructExtendedListenerErrorMessage(ListenerErrorType.UNHANDLED_PARSED_DATA,
+                                ParsableDataType.LIST_DATA,
+                                String.valueOf(ctx.IDENTIFIER().getText()),
+                                ListenerErrorLocation.ENTRY,
+                                e.getMessage()));
+            }
+            listener.getParsedDataStack().push(yangList);
+        } else {
+            throw new ParserException(ListenerErrorMessageConstruction
+                    .constructListenerErrorMessage(ListenerErrorType.INVALID_HOLDER,
+                            ParsableDataType.LIST_DATA,
+                            String.valueOf(ctx.IDENTIFIER().getText()),
+                            ListenerErrorLocation.ENTRY));
+        }
     }
 
     /**
@@ -84,6 +135,77 @@
      */
     public static void processListExit(TreeWalkListener listener,
                                             GeneratedYangParser.ListStatementContext ctx) {
-        // TODO
+
+        ListenerValidation.checkStackIsNotEmpty(listener, ListenerErrorType.MISSING_HOLDER,
+                ParsableDataType.LIST_DATA, String.valueOf(ctx.IDENTIFIER().getText()),
+                ListenerErrorLocation.EXIT);
+
+        if (listener.getParsedDataStack().peek() instanceof YangList) {
+            listener.getParsedDataStack().pop();
+        } else {
+            throw new ParserException(ListenerErrorMessageConstruction
+                    .constructListenerErrorMessage(ListenerErrorType.INVALID_HOLDER,
+                            ParsableDataType.LIST_DATA,
+                            String.valueOf(ctx.IDENTIFIER().getText()),
+                            ListenerErrorLocation.EXIT));
+        }
+    }
+
+    /**
+     * Validates the cardinality of list sub-statements as per grammar.
+     *
+     * @param ctx context object of the grammar rule.
+     * @return true/false validation success or failure.
+     */
+    public static boolean validateSubStatementsCardinality(GeneratedYangParser.ListStatementContext ctx) {
+
+        if ((!ctx.keyStatement().isEmpty())
+                && (ctx.keyStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) {
+            yangConstruct = ParsableDataType.KEY_DATA;
+            return false;
+        }
+
+        if ((!ctx.configStatement().isEmpty())
+                && (ctx.configStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) {
+            yangConstruct = ParsableDataType.CONFIG_DATA;
+            return false;
+        }
+
+        if ((!ctx.maxElementsStatement().isEmpty())
+                && (ctx.maxElementsStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) {
+            yangConstruct = ParsableDataType.MAX_ELEMENT_DATA;
+            return false;
+        }
+
+        if ((!ctx.minElementsStatement().isEmpty())
+                && (ctx.minElementsStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) {
+            yangConstruct = ParsableDataType.MIN_ELEMENT_DATA;
+            return false;
+        }
+
+        if ((!ctx.descriptionStatement().isEmpty())
+                && (ctx.descriptionStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) {
+            yangConstruct = ParsableDataType.DESCRIPTION_DATA;
+            return false;
+        }
+
+        if ((!ctx.referenceStatement().isEmpty())
+                && (ctx.referenceStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) {
+            yangConstruct = ParsableDataType.REFERENCE_DATA;
+            return false;
+        }
+
+        if ((!ctx.statusStatement().isEmpty())
+                && (ctx.statusStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) {
+            yangConstruct = ParsableDataType.STATUS_DATA;
+            return false;
+        }
+
+        if (ctx.dataDefStatement().isEmpty()) {
+            yangConstruct = ParsableDataType.LIST_DATA;
+            return false;
+        }
+
+        return true;
     }
 }
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