com.foglyn.helpers.FBDatatypeComboViewer.java Source code

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Here is the source code for com.foglyn.helpers.FBDatatypeComboViewer.java

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/*******************************************************************************
 * Copyright (c) 2008,2011 Peter Stibrany
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Peter Stibrany (pstibrany@gmail.com) - initial API and implementation
 *******************************************************************************/

package com.foglyn.helpers;

import java.util.Collection;

import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.widgets.Composite;

import com.foglyn.fogbugz.HasID;
import com.foglyn.fogbugz.ID;

public class FBDatatypeComboViewer<I extends ID, T extends HasID<I>> extends ComboViewer {

    public static <I extends ID, T extends HasID<I>> FBDatatypeComboViewer<I, T> create(Class<T> clazz,
            Composite parent, int style, String nullValueLabel, ILabelProvider labelProvider) {
        FBDatatypeComboViewer<I, T> combo = new FBDatatypeComboViewer<I, T>(clazz, parent, style);

        combo.setContentProvider(new CollectionContentProvider(true));
        combo.setLabelProvider(new NullValueLabelProvider(nullValueLabel, labelProvider));

        return combo;
    }

    private final Class<T> clazz;

    public FBDatatypeComboViewer(Class<T> clazz, Composite parent, int style) {
        super(parent, style);
        this.clazz = clazz;

    }

    public I getSelectedID() {
        return convertSelection(getSelection());
    }

    public I convertSelection(ISelection selection) {
        IStructuredSelection sel = (IStructuredSelection) selection;

        Object obj = sel.getFirstElement();
        if (obj == null) {
            return null;
        }

        if (obj.equals(HelperConstants.NULL_VALUE)) {
            return null;
        }

        T castedObj = clazz.cast(obj);
        return castedObj.getID();
    }

    public void setComboValuesFromClientValues(Collection<T> values) {
        I sel = getSelectedID();

        setInput(values);

        for (T v : values) {
            if (v.getID().equals(sel)) {
                setSelection(new StructuredSelection(v), true);
                return;
            }
        }

        setSelection(HelperConstants.NULL_VALUE_SELECTION, true);
    }

    @SuppressWarnings("unchecked")
    public void selectOption(I value) {
        if (value == null) {
            setSelection(HelperConstants.NULL_VALUE_SELECTION, true);
            return;
        }

        // this is potentionally bad ... 
        Collection<T> colls = (Collection<T>) getInput();

        for (T o : colls) {
            if (value.equals(o.getID())) {
                setSelection(new StructuredSelection(o), true);
                return;
            }
        }
    }
}