OTExternalAppServiceImpl.java

package org.concord.otrunk.view;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URL;

import org.concord.framework.otrunk.view.OTExternalAppService;

public class OTExternalAppServiceImpl
    implements OTExternalAppService
{
	public boolean showDocument(URL url)
	{
		if(jnlpShowDocument(url)){
			return true;
		}
		
		// if we are here the jnlp classes can't be found
		
		String osName = System.getProperty("os.name");
		if(osName.equals("Mac OS X")){
			// on OSX the open command can be used.
			try {
	            Runtime.getRuntime().exec(new String []{"open", url.toExternalForm()});
	            return true;
            } catch (IOException e1) {
	            // TODO Auto-generated catch block
	            e1.printStackTrace();
            }			
		}
		
		if(osName.startsWith("Windows")){
			// on windows the start command can be used
			try {
	            Runtime.getRuntime().exec(new String []{"cmd", "/c", "start", url.toExternalForm()});
	            return true;
            } catch (IOException e1) {
	            // TODO Auto-generated catch block
	            e1.printStackTrace();
            }						
		}
		System.err.println("Opening links outside of jnlp on " + osName +
				" is not supported yet");
		
		return false;
	}

	public boolean jnlpShowDocument(URL url)
	{
		try {
			Class<?> serviceManager = Class
					.forName("javax.jnlp.ServiceManager");
			Method lookupMethod = serviceManager.getMethod(
					"lookup", new Class[] { String.class });
			Object basicService = lookupMethod.invoke(null,
					new Object[] { "javax.jnlp.BasicService" });
			Method showDocument = basicService.getClass()
					.getMethod("showDocument",
							new Class[] { URL.class });
			showDocument.invoke(basicService,
					new Object[] { url });
			return true;
		} catch (ClassNotFoundException e){
			// the jnlp classes can't be found so 
			return false;
		} catch (InvocationTargetException e){
			// the jnlp classes are found but they throw an exception when called
			// probably because the classes are on the classpath but we aren't running in webstart
			return false;
		} catch (Exception exp) {
			// Some other exception occurred.
			System.err.println("Can't open external link.");
			exp.printStackTrace();
		}
		return false;		
	}
}