SimpleRefreshingView.java

package be.selckin.swu.repeater;

import org.apache.wicket.Component;
import org.apache.wicket.markup.repeater.RepeatingView;
import org.apache.wicket.model.IModel;

import java.util.Collection;
import java.util.List;

public abstract class SimpleRefreshingView<T> extends RepeatingView {
    private IModel<? extends Collection<? extends T>> model;

    protected SimpleRefreshingView(String id, IModel<? extends Collection<? extends T>> model) {
        super(id, model);
        this.model = model;
    }

    @Override
    protected void onBeforeRender() {
        super.onBeforeRender();
        removeAll();
        for (T item : model.getObject())
            add(create(newChildId(), item));
    }

    @Override
    public boolean isVisible() {
        return model.getObject() != null && !model.getObject().isEmpty();
    }

    protected abstract Component create(String id, T item);
}