Reverting the removed file

components/device-mgt/org.wso2.carbon.device.mgt.extensions/src/main/java/org/wso2/carbon/device/mgt/extensions/license/mgt/file/FileSystemBasedLicenseManager.java

@@ -0,0 +1,57 @@
+/*
+ *   Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
+ *
+ *   WSO2 Inc. licenses this file to you 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.wso2.carbon.device.mgt.extensions.license.mgt.file;
+
+import org.wso2.carbon.device.mgt.common.license.mgt.License;
+import org.wso2.carbon.device.mgt.common.license.mgt.LicenseManagementException;
+import org.wso2.carbon.device.mgt.common.license.mgt.LicenseManager;
+import org.wso2.carbon.utils.CarbonUtils;
+
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.JAXBException;
+import javax.xml.bind.Unmarshaller;
+import java.io.File;
+
+public class FileSystemBasedLicenseManager implements LicenseManager {
+
+    private static final String PATH_MOBILE_PLUGIN_CONF_DIR =
+            CarbonUtils.getEtcCarbonConfigDirPath() + File.separator + "device-mgt-plugins";
+
+    @Override
+    public License getLicense(String deviceType, String languageCode) throws LicenseManagementException {
+        try {
+            String licenseConfigPath =
+                    PATH_MOBILE_PLUGIN_CONF_DIR + File.separator + deviceType + File.separator + "license.xml";
+            File licenseConfig = new File(licenseConfigPath);
+            JAXBContext context = JAXBContext.newInstance(License.class);
+            Unmarshaller unmarshaller = context.createUnmarshaller();
+            return (License) unmarshaller.unmarshal(licenseConfig);
+        } catch (JAXBException e) {
+            throw new LicenseManagementException("Error occurred while un-marshalling license configuration " +
+                    "used for '" + deviceType + "' platform from file system", e);
+        }
+    }
+
+    @Override
+    public void addLicense(String deviceType, License license) throws LicenseManagementException {
+        throw new UnsupportedOperationException("'addLicense' method is not supported in " +
+                "FileSystemBasedLicenseManager");
+    }
+
+}