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// Copyright 2009 Google Inc.
//
// 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.
import com.google.visualization.datasource.DataSourceHelper;
import com.google.visualization.datasource.DataSourceRequest;
import com.google.visualization.datasource.base.DataSourceException;
import com.google.visualization.datasource.base.ReasonType;
import com.google.visualization.datasource.base.ResponseStatus;
import com.google.visualization.datasource.base.StatusType;
import com.google.visualization.datasource.base.TypeMismatchException;
import com.google.visualization.datasource.datatable.ColumnDescription;
import com.google.visualization.datasource.datatable.DataTable;
import com.google.visualization.datasource.datatable.value.ValueType;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* A demo servlet for serving a simple, constant data-table.
*
* For the sake of a complete example this servlet extends HttpServlet.
* DataSourceServlet is an abstract class that provides a template behavior for
* serving data source requests. Consider extending DataSourceServlet for
* easier implementation.
*
* @see com.google.visualization.datasource.DataSourceServlet
* @see com.google.visualization.datasource.example.SimpleExampleServlet
*/
public class SimpleExampleServlet2 extends HttpServlet {
/**
* The log used throughout the data source library.
*/
private static final Log log = LogFactory.getLog(SimpleExampleServlet2.class.getName());
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
DataTable data = generateMyDataTable();
DataSourceRequest dsRequest = null;
try {
// Extract the datasource request parameters.
dsRequest = new DataSourceRequest(req);
// NOTE: If you want to work in restricted mode, which means that only
// requests from the same domain can access the data source, uncomment the following call.
//
// DataSourceHelper.verifyAccessApproved(dsRequest);
// Apply the query to the data table.
DataTable newData = DataSourceHelper.applyQuery(dsRequest.getQuery(), data,
dsRequest.getUserLocale());
// Set the response.
DataSourceHelper.setServletResponse(newData, dsRequest, resp);
} catch (RuntimeException rte) {
log.error("A runtime exception has occured", rte);
ResponseStatus status = new ResponseStatus(StatusType.ERROR, ReasonType.INTERNAL_ERROR,
rte.getMessage());
if (dsRequest == null) {
dsRequest = DataSourceRequest.getDefaultDataSourceRequest(req);
}
DataSourceHelper.setServletErrorResponse(status, dsRequest, resp);
} catch (DataSourceException e) {
if (dsRequest != null) {
DataSourceHelper.setServletErrorResponse(e, dsRequest, resp);
} else {
DataSourceHelper.setServletErrorResponse(e, req, resp);
}
}
}
private DataTable generateMyDataTable() {
// Create a data table,
DataTable data = new DataTable();
ArrayList<ColumnDescription> cd = new ArrayList<ColumnDescription>();
cd.add(new ColumnDescription("name", ValueType.TEXT, "Animal name"));
cd.add(new ColumnDescription("link", ValueType.TEXT, "Link to wikipedia"));
cd.add(new ColumnDescription("population", ValueType.NUMBER, "Population size"));
cd.add(new ColumnDescription("vegeterian", ValueType.BOOLEAN, "Vegetarian?"));
data.addColumns(cd);
// Fill the data table.
try {
data.addRowFromValues("Aye-aye", "http://en.wikipedia.org/wiki/Aye-aye", 100, true);
data.addRowFromValues("Sloth", "http://en.wikipedia.org/wiki/Sloth", 300, true);
data.addRowFromValues("Leopard", "http://en.wikipedia.org/wiki/Leopard", 50, false);
data.addRowFromValues("Tiger", "http://en.wikipedia.org/wiki/Tiger", 80, false);
} catch (TypeMismatchException e) {
System.out.println("Invalid type!");
}
return data;
}
}