OpenDDR-Java

Dear OpenDDR user,

In the follow the description of directory tree:

• lib: contains necessary libraries to run OpenDDR-Simple-API;
• src: contains java source code and the oddr.properties file. Please configure the oddr.properties file with the right path of the resources.

A basic explanation of the properties in oddr.properties:

• oddr.ua.device.builder.path: Path of the file that explain how to identify the devices. In this, for each builder, are specified the devices id that the builder handle and the identification rules
• oddr.ua.device.datasource.path: Path of the device datasource
• oddr.ua.device.builder.patch.paths: Path of the patch file for the builder file
• oddr.ua.device.datasource.patch.paths: Path of the patch file for the device data source
• oddr.ua.browser.datasource.path: Path of the browser data source
• oddr.ua.operatingSystem.datasource.path: Path of the operating system data source
• ddr.vocabulary.core.path: Path of the W3C vocabulary file
• oddr.vocabulary.path: Path of OpenDDR vocabulary
• oddr.limited.vocabulary.path: Path of the reduced vocabulary. This vocabulary is usefull to limitate the memory load. It can be safely left unspecified.
• oddr.vocabulary.device: IRI of the default vocabulary. It is the target namespace specified in a vocabulary
• oddr.threshold: Identification threshold. It is used to balance the request evaluation time and identification matching.

This is a java example on how to integrate OpenDDR in a servlet Filter:

package org.openddr.samplewebapp.filter;
import java.io.IOException;
import java.util.Properties;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.openddr.simpleapi.oddr.ODDRService;
import org.openddr.simpleapi.oddr.model.ODDRHTTPEvidence;
import org.w3c.ddr.simple.Evidence;
import org.w3c.ddr.simple.PropertyRef;
import org.w3c.ddr.simple.PropertyValue;
import org.w3c.ddr.simple.PropertyValues;
import org.w3c.ddr.simple.Service;
import org.w3c.ddr.simple.ServiceFactory;
import org.w3c.ddr.simple.exception.NameException;
public class IdentificationFilter implements Filter {
private Service identificationService = null;
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("Initialize filter");
Properties initializationProperties = new Properties();
ServletContext context = filterConfig.getServletContext(); try {
initializationProperties.load(context.getResourceAsStream("/WEB-INF/oddr.properties"));
identificationService = ServiceFactory.newService("org.openddr.simpleapi.oddr.ODDRService", initializationProperties.getProperty(ODDRService.ODDR_VOCABULARY_IRI), initializationProperties);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
PropertyRef vendorRef;
PropertyRef modelRef;
PropertyRef displayWidthRef;
PropertyRef displayHeightRef;
try {
vendorRef = identificationService.newPropertyRef("vendor");
modelRef = identificationService.newPropertyRef("model");
displayWidthRef = identificationService.newPropertyRef("displayWidth");
displayHeightRef = identificationService.newPropertyRef("displayHeight");
} catch (NameException ex) {
throw new RuntimeException(ex);
}
PropertyRef[] propertyRefs = new PropertyRef[] {vendorRef, modelRef, displayWidthRef, displayHeightRef};
Evidence e = new ODDRHTTPEvidence();
e.put("User-Agent", ((HttpServletRequest)request).getHeader("User-Agent"));
try {
PropertyValues propertyValues = identificationService.getPropertyValues(e, propertyRefs);
PropertyValue vendor = propertyValues.getValue(vendorRef);
PropertyValue model = propertyValues.getValue(modelRef);
PropertyValue displayWidth = propertyValues.getValue(displayWidthRef);
PropertyValue displayHeight = propertyValues.getValue(displayHeightRef);
if (vendor.exists() && model.exists() && displayWidth.exists() && displayHeight.exists()) {
((HttpServletRequest)request).setAttribute("vendor", vendor.getString());
((HttpServletRequest)request).setAttribute("model", model.getString());
((HttpServletRequest)request).setAttribute("displayWidth", displayWidth.getInteger());
((HttpServletRequest)request).setAttribute("displayHeight", displayHeight.getInteger());
}
} catch (Exception ex) {
throw new RuntimeException(ex);
}
chain.doFilter(request, response);
}
public void destroy() {
System.out.println("Destroy Filter");
}
}