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How to use the Diff API in NetBeans E-mail
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From an action or wherever you like you can call this:

    public void diff(final StreamSource local, final StreamSource remote){
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                try {
                    DiffView view = Diff.getDefault().createDiff(local, remote);
                    showDiff(view);
                catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        });
    }

    public void showDiff(final DiffView view){
        SwingUtilities.invokeLater (new Runnable() {
            public void run() {
                //create our panel with our view
                //right now I am just going to use the diff component instead of a panel
                //create a top component with our panel
                DiffTopComponent tc = new DiffTopComponent(view);
                tc.setName("MY_DIFF");
                tc.setDisplayName("Some display name");
                tc.open();
                tc.requestActive();
            }
        });
    }

Here is a top component to display it:

public class DiffTopComponent extends TopComponent{

    /** Creates a new instance of DiffTopComponent */
    public DiffTopComponent(Component diffPanel) {
        setLayout(new BorderLayout());
        add(diffPanel, BorderLayout.CENTER);

getAccessibleContext().setAccessibleName(NbBundle.getMessage(DiffTopComponent.class ,
"ACSN_Diff_Top_Component"))// NOI18N

getAccessibleContext().setAccessibleDescription(NbBundle.getMessage(DiffTopComponent.class,
"ACSD_Diff_Top_Component"))// NOI18N
    }

    public DiffTopComponent(DiffView view) {
        this(view.getComponent());
    }


    public int getPersistenceType(){
        return TopComponent.PERSISTENCE_NEVER;
    }


    protected String preferredID(){
        return "DiffTopComponent";    //NOI18N
    }

    public HelpCtx getHelpCtx() {
        return new HelpCtx(getClass());
    }

}

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