zkoss/zk

/* BindRadioRenderer.java

    Purpose:
        
    Description:
        
    History:
        Feb 3, 2012 3:35:42 PM, Created by dennis

Copyright (C) 2011 Potix Corporation. All Rights Reserved.
*/

package org.zkoss.bind.impl;

import java.io.Serializable;

import org.zkoss.bind.Binder;
import org.zkoss.bind.sys.BinderCtrl;
import org.zkoss.bind.sys.TemplateResolver;
import org.zkoss.lang.Objects;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.UiException;
import org.zkoss.zk.ui.util.ForEachStatus;
import org.zkoss.zk.ui.util.Template;
import org.zkoss.zul.Attributes;
import org.zkoss.zul.ListModel;
import org.zkoss.zul.Radio;
import org.zkoss.zul.RadioRenderer;
import org.zkoss.zul.Radiogroup;

/**
 * radio renderer for binding.
 * @author dennis
 * @since 6.0.0
 */
public class BindRadioRenderer extends AbstractRenderer implements RadioRenderer<Object>, Serializable {
    private static final long serialVersionUID = 1463169907348730644L;

    public void render(final Radio item, final Object data, final int index) throws Exception {
        final Radiogroup radiogroup = item.getRadiogroup();
        final int size = radiogroup.getModel().getSize();
        final Template tm = resolveTemplate(radiogroup, item, data, index, size, "model");
        if (tm == null) {
            item.setLabel(Objects.toString(data));
            item.setValue(data);
        } else {
            final ForEachStatus iterStatus = new AbstractForEachStatus() { //provide iteration status in this context
                private static final long serialVersionUID = 1L;

                public int getIndex() {
                    return index;
                }

                public Object getCurrent() {
                    return data;
                }

                public Integer getEnd() {
                    return size;
                }
            };

            final String var = (String) tm.getParameters().get(EACH_ATTR);
            final String varnm = var == null ? EACH_VAR : var; //var is not specified, default to "each"
            final String itervar = (String) tm.getParameters().get(STATUS_ATTR);
            final String itervarnm = itervar == null ? (var == null ? EACH_STATUS_VAR : varnm + STATUS_POST_VAR)
                    : itervar; //provide default value if not specified

            //bug 1188, EL when nested var and itervar
            Object oldVar = radiogroup.getAttribute(varnm);
            Object oldIter = radiogroup.getAttribute(itervarnm);
            radiogroup.setAttribute(varnm, data);
            radiogroup.setAttribute(itervarnm, iterStatus);

            final Component[] items = filterOutShadows(radiogroup, tm.create(radiogroup, item, null, null));

            // Bug ZK-2882
            if (oldVar == null) {
                radiogroup.removeAttribute(varnm);
            } else {
                radiogroup.setAttribute(varnm, oldVar);
            }
            if (oldIter == null) {
                radiogroup.removeAttribute(itervarnm);
            } else {
                radiogroup.setAttribute(itervarnm, oldIter);
            }

            if (items.length != 1)
                throw new UiException("The model template must have exactly one item, not " + items.length);

            final Radio nr = (Radio) items[0];
            nr.setAttribute(BinderCtrl.VAR, varnm); // for the converter to get the value

            // ZK-2552
            nr.setAttribute(AbstractRenderer.IS_TEMPLATE_MODEL_ENABLED_ATTR, true);
            nr.setAttribute(AbstractRenderer.CURRENT_INDEX_RESOLVER_ATTR, new IndirectBinding(data) {
                public Binder getBinder() {
                    return BinderUtil.getBinder(nr, true);
                }

                protected ListModel getModel() {
                    return radiogroup.getModel();
                }

                public Component getComponent() {
                    return nr;
                }

            });
            addItemReference(radiogroup, nr, index, varnm); //kept the reference to the data, before ON_BIND_INIT

            nr.setAttribute(itervarnm, iterStatus);

            //ZK-1787 When the viewModel tell binder to reload a list, the other component that bind a bean in the list will reload again
            //move TEMPLATE_OBJECT (was set in resoloveTemplate) to current for check in addTemplateTracking
            nr.setAttribute(TemplateResolver.TEMPLATE_OBJECT, item.removeAttribute(TemplateResolver.TEMPLATE_OBJECT));
            //add template dependency
            addTemplateTracking(radiogroup, nr, data, index, size);

            if (nr.getValue() == null) //template might set it
                nr.setValue(data);

            item.setAttribute(Attributes.MODEL_RENDERAS, nr);
            //indicate a new item is created to replace the existent one
            item.detach();
        }
    }
}