Added filiter to app list

components/application-mgt/org.wso2.carbon.device.application.mgt.api/src/main/java/org/wso2/carbon/device/application/mgt/api/common/GsonMessageBodyHandler.java

@@ -51,7 +51,9 @@ public class GsonMessageBodyHandler implements MessageBodyWriter<Object>, Messag
 
     private Gson getGson() {
         if (gson == null) {
-            final GsonBuilder gsonBuilder = new GsonBuilder().setExclusionStrategies(new AnnotationExclusionStrategy());
+            final GsonBuilder gsonBuilder = new GsonBuilder()
+                    .setDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz")
+                    .setExclusionStrategies(new AnnotationExclusionStrategy());
             gson = gsonBuilder.create();
         }
         return gson;

components/application-mgt/org.wso2.carbon.device.application.mgt.api/src/main/java/org/wso2/carbon/device/application/mgt/api/services/ApplicationManagementService.java

@@ -67,11 +67,28 @@ public interface ApplicationManagementService {
                             response = ErrorResponse.class)
             })
     Response getApplications(
+
             @ApiParam(
                     name = "If-Modified-Since",
                     value = "Validates if the requested variant has not been modified since the time specified",
                     required = false)
-            @HeaderParam("If-Modified-Since") String ifModifiedSince);
+            @HeaderParam("If-Modified-Since") String ifModifiedSince,
+
+            @ApiParam(
+                    name = "offset",
+                    value = "Provide how many apps it should return",
+                    required = false,
+                    defaultValue = "20")
+            @QueryParam("offset") int offset,
+
+            @ApiParam(
+                    name = "limit",
+                    value = "Provide from which position apps should return",
+                    required = false,
+                    defaultValue = "0")
+            @QueryParam("limit") int limit
+
+    );
 
 
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.api/src/main/java/org/wso2/carbon/device/application/mgt/api/services/impl/ApplicationManagementServiceImpl.java

@@ -22,28 +22,39 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.wso2.carbon.device.application.mgt.core.components.ApplicationManager;
 import org.wso2.carbon.device.application.mgt.core.dto.ApplicationList;
+import org.wso2.carbon.device.application.mgt.core.dto.Filter;
 import org.wso2.carbon.device.application.mgt.core.util.ApplicationManagementUtil;
 
-import javax.ws.rs.Consumes;
-import javax.ws.rs.GET;
-import javax.ws.rs.Path;
-import javax.ws.rs.Produces;
+import javax.ws.rs.*;
 import javax.ws.rs.core.Response;
 
 @Produces({ "application/json"})
 @Consumes({ "application/json"})
 public class ApplicationManagementServiceImpl {
 
+    public static final int DEFAULT_LIMIT = 20;
+
     private static Log log = LogFactory.getLog(ApplicationManagementServiceImpl.class);
 
 
     @GET
     @Consumes("application/json")
     @Path("applications")
-    public Response getApplications() {
+    public Response getApplications(@QueryParam("offset") int offset, @QueryParam("limit") int limit,
+                                    @QueryParam("q") String searchQuery) {
         ApplicationManager applicationManager = ApplicationManagementUtil.getApplicationManager();
         try {
-            ApplicationList applications = applicationManager.getApplications();
+
+            if(limit == 0){
+                limit = DEFAULT_LIMIT;
+            }
+
+            Filter filter = new Filter();
+            filter.setOffset(offset);
+            filter.setLimit(limit);
+            filter.setSearchQuery(searchQuery);
+
+            ApplicationList applications = applicationManager.getApplications(filter);
             return Response.status(Response.Status.OK).entity(applications).build();
         } catch (Exception e) {
             String msg = "Error occurred while getting the application list";

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/components/ApplicationManager.java

@@ -20,6 +20,7 @@ package org.wso2.carbon.device.application.mgt.core.components;
 
 import org.wso2.carbon.device.application.mgt.core.dto.Application;
 import org.wso2.carbon.device.application.mgt.core.dto.ApplicationList;
+import org.wso2.carbon.device.application.mgt.core.dto.Filter;
 import org.wso2.carbon.device.application.mgt.core.exception.ApplicationManagerException;
 
 import java.util.List;
@@ -28,6 +29,6 @@ public interface ApplicationManager {
 
     public void createApplication(Application application) throws ApplicationManagerException;
 
-    public ApplicationList getApplications() throws ApplicationManagerException;
+    public ApplicationList getApplications(Filter filter) throws ApplicationManagerException;
 
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/components/impl/ApplicationManagerImpl.java

@@ -24,6 +24,7 @@ import org.wso2.carbon.device.application.mgt.core.components.ApplicationManager
 import org.wso2.carbon.device.application.mgt.core.dao.ApplicationManagementDAO;
 import org.wso2.carbon.device.application.mgt.core.dto.Application;
 import org.wso2.carbon.device.application.mgt.core.dto.ApplicationList;
+import org.wso2.carbon.device.application.mgt.core.dto.Filter;
 import org.wso2.carbon.device.application.mgt.core.exception.ApplicationManagerException;
 import org.wso2.carbon.device.application.mgt.core.internal.ApplicationManagementDataHolder;
 import org.wso2.carbon.device.application.mgt.core.util.ConnectionManagerUtil;
@@ -52,10 +53,10 @@ public class ApplicationManagerImpl implements ApplicationManager {
     }
 
     @Override
-    public ApplicationList getApplications() throws ApplicationManagerException {
+    public ApplicationList getApplications(Filter filter) throws ApplicationManagerException {
         ConnectionManagerUtil.openConnection();
         ApplicationManagementDAO applicationManagementDAO = ApplicationManagementDataHolder.getInstance().getApplicationManagementDAO();
-        ApplicationList applications = applicationManagementDAO.getApplications();
+        ApplicationList applications = applicationManagementDAO.getApplications(filter);
         ConnectionManagerUtil.closeConnection();
         return applications;
     }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dao/ApplicationManagementDAO.java

@@ -20,6 +20,7 @@ package org.wso2.carbon.device.application.mgt.core.dao;
 
 import org.wso2.carbon.device.application.mgt.core.dto.Application;
 import org.wso2.carbon.device.application.mgt.core.dto.ApplicationList;
+import org.wso2.carbon.device.application.mgt.core.dto.Filter;
 
 import java.util.HashMap;
 import java.util.List;
@@ -59,6 +60,6 @@ public interface ApplicationManagementDAO {
 
     public void createApplication(Application application) throws ApplicationManagementDAOException;
 
-    public ApplicationList getApplications() throws ApplicationManagementDAOException;
+    public ApplicationList getApplications(Filter filter) throws ApplicationManagementDAOException;
 
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dao/ApplicationManagementDAOException.java

@@ -25,4 +25,8 @@ public class ApplicationManagementDAOException extends ApplicationManagerExcepti
     public ApplicationManagementDAOException(String message, Throwable throwable) {
         super(message, throwable);
     }
+
+    public ApplicationManagementDAOException(String message) {
+        super(message, new Exception());
+    }
 }

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dao/impl/GenericAppManagementDAO.java

@@ -24,6 +24,7 @@ import org.wso2.carbon.device.application.mgt.core.dao.ApplicationManagementDAOE
 import org.wso2.carbon.device.application.mgt.core.dao.ApplicationManagementDAOUtil;
 import org.wso2.carbon.device.application.mgt.core.dto.Application;
 import org.wso2.carbon.device.application.mgt.core.dto.ApplicationList;
+import org.wso2.carbon.device.application.mgt.core.dto.Filter;
 import org.wso2.carbon.device.application.mgt.core.dto.Pagination;
 import org.wso2.carbon.device.application.mgt.core.util.ConnectionManagerUtil;
 
@@ -42,26 +43,45 @@ public class GenericAppManagementDAO implements ApplicationManagementDAO {
     }
 
     @Override
-    public ApplicationList getApplications() throws ApplicationManagementDAOException {
+    public ApplicationList getApplications(Filter filter) throws ApplicationManagementDAOException {
 
         Connection conn = null;
         PreparedStatement stmt = null;
         ResultSet rs = null;
-        String sql = null;
+        String sql = "";
         ApplicationList applicationList = new ApplicationList();
         List<Application> applications = new ArrayList<>();
         Pagination pagination = new Pagination();
 
+        if (filter == null) {
+            throw new ApplicationManagementDAOException("Filter need to be instantiated");
+        } else {
+            pagination.setLimit(filter.getLimit());
+            pagination.setOffset(filter.getOffset());
+        }
+
         try {
 
             conn = ConnectionManagerUtil.getCurrentConnection().get();
 
-            sql = "SELECT SQL_CALC_FOUND_ROWS AP.*, AT.NAME AS AT_NAME, AT.CODE AS AT_CODE, CT.NAME AS CT_NAME " +
-                    "FROM APPM_APPLICATION AS AP " +
-                    "INNER JOIN APPM_APPLICATION_TYPE AS AT ON AP.APPLICATION_TYPE_ID = AT.ID " +
-                    "INNER JOIN APPM_APPLICATION_CATEGORY AS CT ON AP.CATEGORY_ID = CT.ID;";
+            sql += "SELECT SQL_CALC_FOUND_ROWS AP.*, AT.NAME AS AT_NAME, AT.CODE AS AT_CODE, CT.NAME AS CT_NAME ";
+            sql += "FROM APPM_APPLICATION AS AP ";
+            sql += "INNER JOIN APPM_APPLICATION_TYPE AS AT ON AP.APPLICATION_TYPE_ID = AT.ID ";
+            sql += "INNER JOIN APPM_APPLICATION_CATEGORY AS CT ON AP.CATEGORY_ID = CT.ID ";
+            if (filter.getSearchQuery() != null || "".equals(filter.getSearchQuery())) {
+                sql += "WHERE AP.NAME LIKE ? ";
+            }
+            sql += "LIMIT ? ";
+            sql += "OFFSET ?;";
 
             stmt = conn.prepareStatement(sql);
+            int index = 0;
+            if (filter.getSearchQuery() != null || "".equals(filter.getSearchQuery())) {
+                stmt.setString(++index, "%" + filter.getSearchQuery() + "%");
+            }
+            stmt.setInt(++index, filter.getLimit());
+            stmt.setInt(++index, filter.getOffset());
+
             rs = stmt.executeQuery();
 
             int length = 0;
@@ -84,7 +104,7 @@ public class GenericAppManagementDAO implements ApplicationManagementDAO {
                 length++;
             }
 
-            pagination.setLength(length);
+            pagination.setSize(length);
 
             applicationList.setApplications(applications);
             applicationList.setPagination(pagination);

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dto/Filter.java

@@ -0,0 +1,81 @@
+/*
+ *   Copyright (c) 2017, 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.application.mgt.core.dto;
+
+import java.util.Map;
+
+public class Filter {
+
+    private int limit;
+
+    private int offset;
+
+    private String filter;
+
+    private Map<String, String> filterProperties;
+
+    private String searchQuery;
+
+    public int getLimit() {
+        return limit;
+    }
+
+    public void setLimit(int limit) {
+        this.limit = limit;
+    }
+
+    public int getOffset() {
+        return offset;
+    }
+
+    public void setOffset(int offset) {
+        this.offset = offset;
+    }
+
+    public String getFilter() {
+        return filter;
+    }
+
+    public void setFilter(String filter) {
+        this.filter = filter;
+    }
+
+    public Map<String, String> getFilterProperties() {
+        return filterProperties;
+    }
+
+    public void setFilterProperties(Map<String, String> filterProperties) {
+        this.filterProperties = filterProperties;
+    }
+
+    public String getSearchQuery() {
+        return searchQuery;
+    }
+
+    public void setSearchQuery(String searchQuery) {
+        this.searchQuery = searchQuery;
+    }
+
+    public boolean hasCondition() {
+        if (filterProperties != null || searchQuery != null || filter != null) {
+            return true;
+        }
+        return false;
+    }
+}

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dto/Pagination.java

@@ -24,7 +24,7 @@ public class Pagination {
 
     private int limit;
 
-    private int length;
+    private int size;
 
     private int count;
 
@@ -44,12 +44,12 @@ public class Pagination {
         this.limit = limit;
     }
 
-    public int getLength() {
-        return length;
+    public int getSize() {
+        return size;
     }
 
-    public void setLength(int length) {
-        this.length = length;
+    public void setSize(int size) {
+        this.size = size;
     }
 
     public int getCount() {