[ONOS-3884] Base Data model node and parser interface
Change-Id: I94caf7fbf26125126d0779c283076c05fc7cd8cf
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/Parsable.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/Parsable.java
new file mode 100644
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+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/Parsable.java
@@ -0,0 +1,50 @@
+/*
+ * 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;
+
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+
+/**
+ * Abstraction of an entity which process the data of lexer's parse tree.
+ */
+public interface Parsable {
+
+ /**
+ * Get the type of parsable data.
+ *
+ * @return the type of parsable data
+ */
+ ParsableDataType getParsableDataType();
+
+ /**
+ * Check if the node is valid as per YANG grammar's syntax and semantics.
+ * This validation will be performed on entering the node in traversal
+ *
+ * @throws DataModelException if there is any violation of the YANG rules
+ * in parsed data, corresponding exception should be thrown
+ */
+ void validateDataOnEntry() throws DataModelException;
+
+ /**
+ * Check if the node is valid as per YANG grammar's syntax and semantics.
+ * This validation will be performed on exiting the node in traversal
+ *
+ * @throws DataModelException if there is any violation of the YANG rules
+ * in parsed data, corresponding exception should be thrown
+ */
+ void validateDataOnExit() throws DataModelException;
+}
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/ParsableDataType.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/ParsableDataType.java
new file mode 100644
index 0000000..50addeb
--- /dev/null
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/ParsableDataType.java
@@ -0,0 +1,136 @@
+/*
+ * 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;
+
+/**
+ * ENUM to represent the type of data in parse tree.
+ */
+public enum ParsableDataType {
+ /**
+ * Identifies the module parsed data.
+ */
+ MODULE_DATA,
+
+ /**
+ * Identifies the sub module parsed data.
+ */
+ SUB_MODULE_DATA,
+
+ /**
+ * Identifies the typedef parsed data.
+ */
+ TYPEDEF_DATA,
+
+ /**
+ * Identifies the type parsed data.
+ */
+ TYPE_DATA,
+
+ /**
+ * Identifies the choice parsed data.
+ */
+ CHOICE_DATA,
+
+ /**
+ * Identifies the case parsed data.
+ */
+ CASE_DATA,
+
+ /**
+ * Identifies the YANG enumeration parsed data.
+ */
+ ENUMERATION_DATA,
+
+ /**
+ * Identifies the grouping parsed data.
+ */
+ GROUPING_DATA,
+
+ /**
+ * Identifies the uses parsed data.
+ */
+ USES_DATA,
+
+ /**
+ * Identifies the augment parsed data.
+ */
+ AUGMENT_DATA,
+
+ /**
+ * Identifies the container parsed data.
+ */
+ CONTAINER_DATA,
+
+ /**
+ * Identifies the YANG list parsed data.
+ */
+ LIST_DATA,
+
+ /**
+ * Identifies the YANG belongs-to parsed data.
+ */
+ BELONGS_TO_DATA,
+
+ /**
+ * Identifies the YANG bit parsed data.
+ */
+ BIT_DATA,
+
+ /**
+ * Identifies the YANG bits parsed data.
+ */
+ BITS_DATA,
+
+ /**
+ * Identifies the YANG enum parsed data.
+ */
+ ENUM_DATA,
+
+ /**
+ * Identifies the YANG import parsed data.
+ */
+ IMPORT_DATA,
+
+ /**
+ * Identifies the YANG include parsed data.
+ */
+ INCLUDE_DATA,
+
+ /**
+ * Identifies the YANG leaf parsed data.
+ */
+ LEAF_DATA,
+
+ /**
+ * Identifies the YANG leaf list parsed data.
+ */
+ LEAF_LIST_DATA,
+
+ /**
+ * Identifies the YANG must parsed data.
+ */
+ MUST_DATA,
+
+ /**
+ * Identifies the YANG revision parsed data.
+ */
+ REVISION_DATA,
+
+ /**
+ * Identifies the YANG namespace parsed data.
+ */
+ NAMESPACE_DATA
+}