Step3Network.java

package vlove.web.vms.wizard;

import java.util.ArrayList;
import java.util.List;

import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.form.OnChangeAjaxBehavior;
import org.apache.wicket.extensions.wizard.WizardStep;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.form.DropDownChoice;
import org.apache.wicket.markup.html.form.IChoiceRenderer;
import org.apache.wicket.markup.html.form.RequiredTextField;
import org.apache.wicket.spring.injection.annot.SpringBean;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import vlove.VirtException;
import vlove.service.VirtManager;

public class Step3Network extends WizardStep {
  transient final Logger log = LoggerFactory.getLogger(getClass());

  @SpringBean
  VirtManager            vm;

  public Step3Network() {
    List<String> networks = new ArrayList<>();
    try {
      networks.add("manual");
      networks.addAll(vm.getNetworks());
    } catch (VirtException ve) {
      log.error("Could not retrieve networks.", ve);
      // TODO bomb out properly
    }

    final WebMarkupContainer bridgeCont = new WebMarkupContainer("bridgeContainer");
    add(bridgeCont.setOutputMarkupId(true).setOutputMarkupPlaceholderTag(true).setVisible(false));

    bridgeCont.add(new RequiredTextField<String>("bridge"));

    final DropDownChoice<String> ddNetworks = new DropDownChoice<>("networks", networks, new IChoiceRenderer<String>() {
      @Override
      public Object getDisplayValue(String object) {
        return object;
      }

      @Override
      public String getIdValue(String object, int index) {
        return object;
      }
    });

    ddNetworks.add(new OnChangeAjaxBehavior() {
      @Override
      protected void onUpdate(AjaxRequestTarget target) {
        try {
          final String network = getFormComponent().getValue();
          if (network == null || network.length() == 0) { return; }

          if (network.equalsIgnoreCase("manual")) {
            // Pop up the text field asking for the bridge
            target.add(bridgeCont.setVisible(true));
          } else {
            target.add(bridgeCont.setVisible(false));
            String bridgeName = vm.getNetwork(network);
            log.debug("Bridge name: {}", bridgeName);
          }
        } catch (Exception ex) {
          log.error("Could not process selected network.", ex);
          // TODO bomb out
        }
      }
    });
    add(ddNetworks.setRequired(true));
  }
}