GenericSelectionModel.java

package net.agef.jobexchange.services.internal;
import java.util.ArrayList;
import java.util.List;

import org.apache.tapestry5.OptionGroupModel;
import org.apache.tapestry5.OptionModel;
import org.apache.tapestry5.internal.OptionModelImpl;
import org.apache.tapestry5.ioc.services.PropertyAccess;
import org.apache.tapestry5.ioc.services.PropertyAdapter;
import org.apache.tapestry5.util.AbstractSelectModel;

public class GenericSelectionModel<T> extends AbstractSelectModel {

        private PropertyAdapter labelFieldAdapter = null;

        private List<T> list;

        public GenericSelectionModel(List<T> list, String labelField, PropertyAccess access) {
                if(labelField != null && !labelField.equalsIgnoreCase("null")){
                        if(list.size() > 0){
                                this.labelFieldAdapter = access.getAdapter(list.get(0).getClass()).getPropertyAdapter(labelField);
                        }
                }
                this.list = list;
        }

        public List<OptionGroupModel> getOptionGroups() {
                return null;
        }

        public List<OptionModel> getOptions() {
                List<OptionModel> optionModelList = new ArrayList<OptionModel>();
                for (T obj : list) {
                        if (labelFieldAdapter == null) {
                                optionModelList.add(new OptionModelImpl(nvl(obj) + "",obj));
                        } else {
                                optionModelList.add(new OptionModelImpl(nvl(labelFieldAdapter.get(obj)),obj));
                        }
                }
                return optionModelList;
        }

        private String nvl(Object o) {
                if (o == null)
                        return "";
                else
                        return o.toString();
        }

}