[ONOS-4348] Yang Bits, Binary and Decimal64
Change-Id: I8e4e54a19a8f9634cbc56a07579a1730174f53f6
diff --git a/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/FractionDigitsListener.java b/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/FractionDigitsListener.java
new file mode 100644
index 0000000..baeb252
--- /dev/null
+++ b/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/FractionDigitsListener.java
@@ -0,0 +1,117 @@
+/*
+ * 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;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * decimal64-specification = fraction-digits-stmt
+ *
+ * fraction-digits-stmt = fraction-digits-keyword sep
+ * fraction-digits-arg-str stmtend
+ *
+ * fraction-digits-arg-str = < a string that matches the rule
+ * fraction-digits-arg >
+ *
+ * fraction-digits-arg = ("1" ["0" / "1" / "2" / "3" / "4" /
+ * "5" / "6" / "7" / "8"])
+ * / "2" / "3" / "4" / "5" / "6" / "7" / "8" / "9"
+ *
+ * ANTLR grammar rule
+ * decimal64Specification : FRACTION_DIGITS_KEYWORD fraction STMTEND;
+ *
+ * fraction : string;
+ */
+
+import org.onosproject.yangutils.datamodel.YangDecimal64;
+import org.onosproject.yangutils.datamodel.YangRangeRestriction;
+import org.onosproject.yangutils.datamodel.YangType;
+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.FRACTION_DIGITS_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.ListenerValidation.checkStackIsNotEmpty;
+
+/**
+ * Represents listener based call back function corresponding to the "fraction-digits"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class FractionDigitsListener {
+
+ /**
+ * Creates a new bit listener.
+ */
+ private FractionDigitsListener() {
+ }
+
+ /**
+ * It is called when parser enters grammar rule (fraction-digits), it perform
+ * validations and updates the data model tree.
+ *
+ * @param listener listener's object
+ * @param ctx context object of the grammar rule
+ */
+ public static void processFractionDigitsEntry(TreeWalkListener listener,
+ GeneratedYangParser.FractionDigitStatementContext ctx) {
+
+ // Check for stack to be non empty.
+ checkStackIsNotEmpty(listener, MISSING_HOLDER, FRACTION_DIGITS_DATA, ctx.fraction().getText(), ENTRY);
+
+ int value = getValidFractionDigits(ctx);
+
+ Parsable tmpNode = listener.getParsedDataStack().peek();
+ if (tmpNode instanceof YangType) {
+ YangType<YangDecimal64<YangRangeRestriction>> typeNode =
+ (YangType<YangDecimal64<YangRangeRestriction>>) tmpNode;
+ YangDecimal64 decimal64Node = typeNode.getDataTypeExtendedInfo();
+ decimal64Node.setFractionDigit(value);
+ } else {
+ throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, FRACTION_DIGITS_DATA,
+ ctx.fraction().getText(), ENTRY));
+ }
+ }
+
+ /**
+ * Validate fraction digits.
+ *
+ * @param ctx context object of the grammar rule
+ * @return validated fraction-digits
+ */
+ public static int getValidFractionDigits(GeneratedYangParser.FractionDigitStatementContext ctx) {
+ String value = ctx.fraction().getText().trim();
+ ParserException parserException;
+
+ int fractionDigits = Integer.parseInt(value);
+ if ((fractionDigits >= YangDecimal64.MIN_FRACTION_DIGITS_VALUE) &&
+ (fractionDigits <= YangDecimal64.MAX_FRACTION_DIGITS_VALUE)) {
+ return fractionDigits;
+ } else {
+ parserException =
+ new ParserException("YANG file error : fraction-digits value should be between 1 and 18.");
+ parserException.setLine(ctx.getStart().getLine());
+ parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+ throw parserException;
+ }
+ }
+}