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Diffstat (limited to 'framework/src/onos/core/api/src/main/java/org/onosproject/ui/table/TableRequestHandler.java')
-rw-r--r-- | framework/src/onos/core/api/src/main/java/org/onosproject/ui/table/TableRequestHandler.java | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/framework/src/onos/core/api/src/main/java/org/onosproject/ui/table/TableRequestHandler.java b/framework/src/onos/core/api/src/main/java/org/onosproject/ui/table/TableRequestHandler.java new file mode 100644 index 00000000..b8d48575 --- /dev/null +++ b/framework/src/onos/core/api/src/main/java/org/onosproject/ui/table/TableRequestHandler.java @@ -0,0 +1,111 @@ +/* + * Copyright 2015 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.ui.table; + +import com.fasterxml.jackson.databind.node.ObjectNode; +import org.onosproject.ui.JsonUtils; +import org.onosproject.ui.RequestHandler; + +/** + * Message handler specifically for table views. + */ +public abstract class TableRequestHandler extends RequestHandler { + + private final String respType; + private final String nodeName; + + /** + * Constructs a table request handler for a specific table view. When + * table requests come in, the handler will generate the appropriate + * table rows, sort them according the the request sort parameters, and + * send back the response to the client. + * + * @param reqType type of the request event + * @param respType type of the response event + * @param nodeName name of JSON node holding row data + */ + public TableRequestHandler(String reqType, String respType, String nodeName) { + super(reqType); + this.respType = respType; + this.nodeName = nodeName; + } + + @Override + public void process(long sid, ObjectNode payload) { + TableModel tm = createTableModel(); + populateTable(tm, payload); + + String sortCol = JsonUtils.string(payload, "sortCol", defaultColumnId()); + String sortDir = JsonUtils.string(payload, "sortDir", "asc"); + tm.sort(sortCol, TableModel.sortDir(sortDir)); + + ObjectNode rootNode = MAPPER.createObjectNode(); + rootNode.set(nodeName, TableUtils.generateArrayNode(tm)); + sendMessage(respType, 0, rootNode); + } + + /** + * Creates the table model (devoid of data) using {@link #getColumnIds()} + * to initialize it, ready to be populated. + * <p> + * This default implementation returns a table model with default + * formatters and comparators for all columns. + * + * @return an empty table model + */ + protected TableModel createTableModel() { + return new TableModel(getColumnIds()); + } + + /** + * Returns the default column ID to be used when one is not supplied in + * the payload as the column on which to sort. + * <p> + * This default implementation returns "id". + * + * @return default sort column identifier + */ + protected String defaultColumnId() { + return "id"; + } + + /** + * Subclasses should return the array of column IDs with which + * to initialize their table model. + * + * @return the column IDs + */ + protected abstract String[] getColumnIds(); + + /** + * Subclasses should populate the table model by adding + * {@link TableModel.Row rows}. + * <pre> + * tm.addRow() + * .cell(COL_ONE, ...) + * .cell(COL_TWO, ...) + * ... ; + * </pre> + * The request payload is provided in case there are request filtering + * parameters (other than sort column and sort direction) that are required + * to generate the appropriate data. + * + * @param tm the table model + * @param payload request payload + */ + protected abstract void populateTable(TableModel tm, ObjectNode payload); +} |