[ONOS-3878, 3876, 3879] Yang Parser Manager with Stack and Error Validation
Change-Id: I10e68bd676eca4d576de1234fbb67026c7b49939
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ParseTreeErrorListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ParseTreeErrorListener.java
new file mode 100644
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+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ParseTreeErrorListener.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2016 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.parserutils;
+
+import org.antlr.v4.runtime.BaseErrorListener;
+import org.antlr.v4.runtime.RecognitionException;
+import org.antlr.v4.runtime.Recognizer;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+
+/**
+ * By default, ANTLR sends all errors to standard error, this is changed by
+ * providing this new implementation of interface ANTLRErrorListener. The
+ * interface has a syntaxError() method that applies to both lexer and
+ * parser.
+ */
+public class ParseTreeErrorListener extends BaseErrorListener {
+
+ // Exception of type parser exceptions are catched during parsing.
+ private ParserException parserException = new ParserException();
+
+ // Flag to indicate presence of exception.
+ private boolean exceptionFlag = false;
+
+ /**
+ * Returns the status of exception flag.
+ *
+ * @return flag which contains the status of exception.
+ */
+ public boolean isExceptionFlag() {
+ return exceptionFlag;
+ }
+
+ /**
+ * Returns the parser exception object populated with line, character
+ * position and message.
+ *
+ * @return object of parser exception.
+ */
+ public ParserException getParserException() {
+ return parserException;
+ }
+
+ @Override
+ public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol, int line, int charPositionInLine,
+ String msg, RecognitionException e) {
+ parserException.setLine(line);
+ parserException.setCharPosition(charPositionInLine);
+ parserException.setMsg(msg);
+ exceptionFlag = true;
+ }
+}
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