Example usage for org.apache.wicket MarkupContainer getMetaData

Introduction

In this page you can find the example usage for org.apache.wicket MarkupContainer getMetaData.

Prototype

public final <M extends Serializable> M getMetaData(final MetaDataKey<M> key) 

Source Link

Document

Gets metadata for this component using the given key.

Usage

From source file:org.wicketstuff.minis.component.ListViewFormComponentReuseManager.java

License:Apache License

/**
 * Either adds the given <code>newComponent</code> to the parent or reuses an existing component
 * instance previously used with the same model object.
 * /*from   w ww  .  j  ava  2s  .  com*/
 * @param <T>
 * @param parent
 * @param newComponent
 * @return <code>newComponent</code> or a component previously bound to the same model object
 */
public static <T extends FormComponent<?>> T addOrReuse(final MarkupContainer parent, final T newComponent) {
    Object rowModelObject = null;
    MarkupContainer current = parent;
    while (current != null) {
        if (current instanceof ListItem<?>)
            rowModelObject = current.getDefaultModelObject();
        if (current instanceof ListView) {
            ListViewFormComponentReuseManager mgr = current.getMetaData(REUSE_MANAGER_META_KEY);
            if (mgr == null) {
                mgr = new ListViewFormComponentReuseManager();
                current.setMetaData(REUSE_MANAGER_META_KEY, mgr);
            }
            @SuppressWarnings("unchecked")
            final T componentToUse = (T) mgr.rememberOrReuse(rowModelObject, (FormComponent<?>) newComponent);
            parent.add(componentToUse);
            return componentToUse;
        }
        current = current.getParent();
    }
    return newComponent;
}

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