/
EnumChoiceRenderer.java
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/
EnumChoiceRenderer.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.wicket.markup.html.form;
import org.apache.wicket.Application;
import org.apache.wicket.Component;
import org.apache.wicket.util.lang.Classes;
/**
* {@link IChoiceRenderer} implementation that makes it easy to work with java 5 enums. This
* renderer will attempt to lookup strings used for the display value using a localizer of a given
* component. If the component is not specified, the global instance of localizer will be used for
* lookups.
* <p>
* display value resource key format: {@code <enum.getSimpleClassName()>.<enum.name()>}
* </p>
* <p>
* id value format: {@code <enum.name()>}
* </p>
*
* @author igor.vaynberg
*
* @param <T>
*/
public class EnumChoiceRenderer<T extends Enum<T>> implements IChoiceRenderer<T>
{
private static final long serialVersionUID = 1L;
/**
* component used to resolve i18n resources for this renderer.
*/
private final Component resourceSource;
/**
* Constructor that creates the choice renderer that will use global instance of localizer to
* resolve resource keys.
*/
public EnumChoiceRenderer()
{
this(null);
}
/**
* Constructor
*
* @param resourceSource
*/
public EnumChoiceRenderer(Component resourceSource)
{
this.resourceSource = resourceSource;
}
/** {@inheritDoc} */
@Override
public Object getDisplayValue(T object)
{
final String value;
String key = resourceKey(object);
if (resourceSource != null)
{
value = resourceSource.getString(key);
}
else
{
value = Application.get().getResourceSettings().getLocalizer().getString(key, null);
}
return value;
}
/**
* Translates the {@code object} into resource key that will be used to lookup the value shown
* to the user
*
* @param object
* @return resource key
*/
protected String resourceKey(T object)
{
return Classes.simpleName(object.getDeclaringClass()) + '.' + object.name();
}
/** {@inheritDoc} */
@Override
public String getIdValue(T object, int index)
{
return object.name();
}
}