SplitFeedbackPanel.java

package be.selckin.swu;

import com.google.common.collect.ImmutableList;
import org.apache.wicket.MarkupContainer;
import org.apache.wicket.feedback.ContainerFeedbackMessageFilter;
import org.apache.wicket.feedback.ErrorLevelFeedbackMessageFilter;
import org.apache.wicket.feedback.ExactLevelFeedbackMessageFilter;
import org.apache.wicket.feedback.FeedbackMessage;
import org.apache.wicket.feedback.IFeedback;
import org.apache.wicket.feedback.IFeedbackMessageFilter;
import org.apache.wicket.markup.html.panel.FeedbackPanel;
import org.apache.wicket.markup.html.panel.Panel;

import java.util.List;

public class SplitFeedbackPanel extends Panel implements IFeedback {
    private static final IFeedbackMessageFilter SUCCESS_FILTER = new ExactLevelFeedbackMessageFilter(FeedbackMessage.INFO);
    private static final IFeedbackMessageFilter WARNING_FILTER = new ExactLevelFeedbackMessageFilter(FeedbackMessage.WARNING);
    private static final IFeedbackMessageFilter ERROR_FILTER = new ErrorLevelFeedbackMessageFilter(FeedbackMessage.ERROR);

    public SplitFeedbackPanel(String id) {
        this(id, (IFeedbackMessageFilter) null);
    }

    public SplitFeedbackPanel(String id, IFeedbackMessageFilter filter) {
        super(id);
        setOutputMarkupId(true);
        setOutputMarkupPlaceholderTag(true);
        add(create("success", createFilter(SUCCESS_FILTER, filter)));
        add(create("warning", createFilter(WARNING_FILTER, filter)));
        add(create("error", createFilter(ERROR_FILTER, filter)));
        add(new ClassAttributeAppender("feedback"));
    }

    public SplitFeedbackPanel(String id, MarkupContainer container) {
        this(id, new ContainerFeedbackMessageFilter(container));
    }

    private IFeedbackMessageFilter createFilter(IFeedbackMessageFilter base, IFeedbackMessageFilter extra) {
        return extra == null ? base : new CompoundIFeedbackMessageFilter(base, extra);
    }

    private FeedbackPanel create(String id, final IFeedbackMessageFilter filter) {
        FeedbackPanel panel = new FeedbackPanel(id, filter) {
            @Override
            protected void onConfigure() {
                super.onConfigure();
                setVisible(anyMessage());
            }
        };
        panel.setOutputMarkupId(true);
        panel.setOutputMarkupPlaceholderTag(true);
        return panel;
    }

    private static final class CompoundIFeedbackMessageFilter implements IFeedbackMessageFilter {
        private final List<IFeedbackMessageFilter> filters;

        private CompoundIFeedbackMessageFilter(IFeedbackMessageFilter... filters) {
            this(ImmutableList.copyOf(filters));
        }

        private CompoundIFeedbackMessageFilter(List<IFeedbackMessageFilter> filters) {
            this.filters = filters;
        }

        @Override
        public boolean accept(FeedbackMessage message) {
            for (IFeedbackMessageFilter filter : filters) {
                if (!filter.accept(message))
                    return false;
            }
            return true;
        }
    }
}