java - How to fetch path of a file from preference page and print the Output on console via Button on Workbench? -

i have made 1 preference page programming is:

public class saml extends fieldeditorpreferencepage implements iworkbenchpreferencepage {  public saml() {     super(grid);     setpreferencestore(rmpplugin.getdefault().getpreferencestore());     setdescription("browse appropriate files"); }  public filefieldeditor f; public filefieldeditor f1; public void createfieldeditors() {     f=new filefieldeditor(preferenceconstants.p_path,              "&prism.bat file:", getfieldeditorparent());     addfield(f);      f1=new filefieldeditor(preferenceconstants.p_path1,              "&nusmv application file:", getfieldeditorparent());     addfield(f1); } 

i want path of filefieldeditor f , want path run on button embedded on workbench (but programming of button in different project on same workspace). button programming has hard coded path of "prism.bat" file is:

try {         //to clear console on every click of button          iviewpart view = platformui.getworkbench().getactiveworkbenchwindow().getactivepage().findview(iconsoleconstants.id_console_view);         if (view != null) {             (myconsole).clearconsole();         }                    processbuilder pb=new processbuilder("c:\\program files\\prism-4.0\\bin\\prism.bat");         pb.directory(new file("c:\\program files\\prism-4.0\\bin"));         process p=pb.start();          bufferedreader input = new bufferedreader(new inputstreamreader(p.getinputstream()));          string in;         while((in = input.readline()) != null) {             out.println(in);         }           int exitval=p.waitfor();                     if(exitval==0)        {             out.println("process successful");             out.println("printing on console exitvalue =0");          }        else            {out.println("process failed");            out.println("exitvalue = 1");            }      }         catch (exception e)         {             out.println(e.tostring());             e.printstacktrace();          } 

but want fetch file preference page filefieldeditor f , want path embed in button programming when button pressed, result shown.

you need 2 parts:

• code initialize default preference
• code use current value

to set default, use following code in activator:

public class activator extends abstractuiplugin {     @override     public void start(bundlecontext context) throws exception {         super.start(context);         ipreferencestore ps = getpreferencestore();         ps.setdefault(show_image, true);     }     public static final string show_image = "showimage"; } 

alternatively, can use org.eclipse.core.runtime.preferences extension point...

note code above assume type of preference boolean - there other methods numbers, strings, etc... file name string.

to use current value, use

if (activator.getdefault().getpreferencestore().getboolean(activator.show_image)) {     … } 

the following slides contains little more information...