ResponseComboViewer.java

package com.laboki.eclipse.plugin.smartsave.preferences.ui;

import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;

abstract class ResponseComboViewer extends ComboViewer {

	private final LabelProvider labelProvider = new ResponseLabelProvider();
	private final ISelectionChangedListener listener =
		new ResponseSelectionListener();
	private final Response[] responses = new Response[] {
		new Response(Response.YES), new Response(Response.NO),
	};

	protected ResponseComboViewer(final Composite parent) {
		super(parent, SWT.READ_ONLY);
		this.updateProperties();
	}

	private void
	updateProperties() {
		this.setContentProvider(ArrayContentProvider.getInstance());
		this.setLabelProvider(this.labelProvider);
		this.setInput(this.responses);
	}

	protected void
	startListening() {
		this.addSelectionChangedListener(this.listener);
	}

	protected void
	stopListening() {
		this.removeSelectionChangedListener(this.listener);
	}

	protected void
	handleResponseSelection(final SelectionChangedEvent event) {}

	protected Response[]
	getResponses() {
		return this.responses;
	}

	private final static class ResponseLabelProvider extends LabelProvider {

		public ResponseLabelProvider() {}

		@Override
		public String
		getText(final Object element) {
			return ((Response) element).string();
		}
	}

	private final class ResponseSelectionListener
		implements
			ISelectionChangedListener {

		public ResponseSelectionListener() {}

		@Override
		public void
		selectionChanged(final SelectionChangedEvent event) {
			ResponseComboViewer.this.handleResponseSelection(event);
		}
	}

	protected final static class Response {

		private boolean value;
		public static final String YES = "yes";
		public static final String NO = "no";

		public Response(final String response) {
			if (response.equals(Response.YES)) this.value = true;
		}

		public boolean
		value() {
			return this.value;
		}

		public String
		string() {
			if (this.value) return "Yes";
			return "No";
		}
	}
}