[ONOS-3892] implement YANG leaf data model
Change-Id: I996d4d3d60a0ad2142e173c6ba26c9cc355ccc80
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/YangImport.java b/src/main/java/org/onosproject/yangutils/datamodel/YangImport.java
new file mode 100644
index 0000000..cf18a62
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+++ b/src/main/java/org/onosproject/yangutils/datamodel/YangImport.java
@@ -0,0 +1,176 @@
+/*
+ * 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.datamodel;
+
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.parser.Parsable;
+import org.onosproject.yangutils.parser.ParsableDataType;
+
+/*
+ * Reference:RFC 6020.
+ * The "import" statement makes definitions from one module available
+ * inside another module or submodule. The argument is the name of the
+ * module to import, and the statement is followed by a block of
+ * sub statements that holds detailed import information.
+ * When a module is imported, the importing module may:
+ * o use any grouping and typedef defined at the top level in the
+ * imported module or its submodules.
+ *
+ * o use any extension, feature, and identity defined in the imported
+ * module or its submodules.
+ *
+ * o use any node in the imported module's schema tree in "must",
+ * "path", and "when" statements, or as the target node in "augment"
+ * and "deviation" statements.
+ *
+ * The mandatory "prefix" sub statement assigns a prefix for the imported
+ * module that is scoped to the importing module or submodule. Multiple
+ * "import" statements may be specified to import from different
+ * modules.
+ * When the optional "revision-date" sub-statement is present, any
+ * typedef, grouping, extension, feature, and identity referenced by
+ * definitions in the local module are taken from the specified revision
+ * of the imported module. It is an error if the specified revision of
+ * the imported module does not exist. If no "revision-date"
+ * sub-statement is present, it is undefined from which revision of the
+ * module they are taken.
+ *
+ * Multiple revisions of the same module MUST NOT be imported.
+ *
+ * The import's Substatements
+ *
+ * +---------------+---------+-------------+------------------+
+ * | substatement | section | cardinality |data model mapping|
+ * +---------------+---------+-------------+------------------+
+ * | prefix | 7.1.4 | 1 | string |
+ * | revision-date | 7.1.5.1 | 0..1 | string |
+ * +---------------+---------+-------------+------------------+
+ */
+/**
+ * Maintains the information about the imported modules.
+ */
+public class YangImport implements Parsable {
+
+ /**
+ * Name of the module that is being imported.
+ */
+ private String name;
+
+ /**
+ * Prefix used to identify the entities from the imported module.
+ */
+ private String prefixId;
+
+ /**
+ * Reference:RFC 6020.
+ * The import's "revision-date" statement is used to specify the exact
+ * version of the module to import. The "revision-date" statement MUST match
+ * the most recent "revision" statement in the imported module. organization
+ * which defined the YANG module.
+ */
+ private String revision;
+
+ /**
+ * Default constructor.
+ */
+ public YangImport() {
+
+ }
+
+ /**
+ * Get the imported module name.
+ *
+ * @return the module name.
+ */
+ public String getModuleName() {
+ return name;
+ }
+
+ /**
+ * Set module name.
+ *
+ * @param moduleName the module name to set
+ */
+ public void setModuleName(String moduleName) {
+ name = moduleName;
+ }
+
+ /**
+ * Get the prefix used to identify the entities from the imported module.
+ *
+ * @return the prefix used to identify the entities from the imported
+ * module.
+ */
+ public String getPrefixId() {
+ return prefixId;
+ }
+
+ /**
+ * Set prefix identifier.
+ *
+ * @param prefixId set the prefix identifier of the imported module.
+ */
+ public void setPrefixId(String prefixId) {
+ this.prefixId = prefixId;
+ }
+
+ /**
+ * Get the revision of the imported module.
+ *
+ * @return the revision of the imported module.
+ */
+ public String getRevision() {
+ return revision;
+ }
+
+ /**
+ * Set the revision of the imported module.
+ *
+ * @param rev set the revision of the imported module.
+ */
+ public void setRevision(String rev) {
+ revision = rev;
+ }
+
+ /**
+ * Returns the type of the parsed data.
+ *
+ * @return returns IMPORT_DATA
+ */
+ public ParsableDataType getParsableDataType() {
+ return ParsableDataType.IMPORT_DATA;
+ }
+
+ /**
+ * Validate the data on entering the corresponding parse tree node.
+ *
+ * @throws DataModelException a violation of data model rules
+ */
+ public void validateDataOnEntry() throws DataModelException {
+ // TODO auto-generated method stub, to be implemented by parser
+
+ }
+
+ /**
+ * Validate the data on exiting the corresponding parse tree node.
+ *
+ * @throws DataModelException a violation of data model rules
+ */
+ public void validateDataOnExit() throws DataModelException {
+ // TODO auto-generated method stub, to be implemented by parser
+
+ }
+}