/*******************************************************************************
* This file is part of Goko.
*
* Goko is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Goko is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Goko. If not, see <http://www.gnu.org/licenses/>.
*******************************************************************************/
package org.goko.common.elements.list;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.lang3.StringUtils;
import org.eclipse.core.databinding.observable.list.IObservableList;
import org.eclipse.jface.databinding.viewers.ObservableListContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.ListViewer;
import org.eclipse.swt.widgets.Composite;
import org.goko.core.log.GkLog;
public class GkList<T> extends ListViewer {
public static final GkLog LOG = GkLog.getLogger(GkList.class);
public GkList(Composite parent, IObservableList list, Class<T> clazz, String labelField) {
super(parent);
buildListViewer(list, clazz, labelField);
}
protected void buildListViewer(IObservableList list, Class<T> clazz, String labelField){
setContentProvider(new ObservableListContentProvider());
setInput( list );
setLabelProvider(new BeanLabelProvider(labelField, clazz));
}
public GkList(Composite parent, int style) {
super(parent, style);
}
public List<T> getSelectedElements() {
List<T> selection = new ArrayList<T>();
IStructuredSelection structuredSelection = (IStructuredSelection) getSelection();
for (Iterator iterator = structuredSelection.iterator(); iterator.hasNext();) {
T element = (T) iterator.next();
selection.add(element);
}
return selection;
}
class BeanLabelProvider<T> extends LabelProvider{
String fieldName;
Class<T> clazz;
Method getMethod;
BeanLabelProvider(String fieldName, Class<T> clazz){
this.fieldName = fieldName;
this.clazz = clazz;
}
/** (inheritDoc)
* @see org.eclipse.jface.viewers.LabelProvider#getText(java.lang.Object)
*/
@Override
public String getText(Object element) {
if(element == null){
return "";
}
if(element.getClass() != clazz){
throw new IllegalArgumentException("Class does not match. Got '"+element.getClass()+"', expected '"+clazz.toString()+"'");
}
if(getMethod == null){
try {
findGetMethod();
} catch (NoSuchFieldException e) {
LOG.error(e);
return null;
} catch (SecurityException e) {
LOG.error(e);
return null;
} catch (NoSuchMethodException e) {
LOG.error(e);
return null;
}
}
String label = StringUtils.EMPTY;
try {
Object obj = getMethod.invoke(element);
label = String.valueOf(obj);
} catch (IllegalAccessException e) {
LOG.error(e);
return null;
} catch (IllegalArgumentException e) {
LOG.error(e);
return null;
} catch (InvocationTargetException e) {
LOG.error(e);
return null;
}
return label;
}
private void findGetMethod() throws NoSuchFieldException, SecurityException, NoSuchMethodException {
String expectedName = "get"+StringUtils.upperCase(StringUtils.substring(fieldName, 0,1))+StringUtils.substring(fieldName, 1);
getMethod = clazz.getDeclaredMethod(expectedName);
}
}
}