defaultmarkupcachekeyprovider.java

Wicket一个开发Java Web应用程序框架。它使得开发web应用程序变得容易而轻松。 Wicket利用一个POJO data beans组件使得它可以与任何持久层技术相结合。

/*
 * 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;

import java.util.Locale;

import org.apache.wicket.MarkupContainer;
import org.apache.wicket.util.string.AppendingStringBuffer;


/**
 * Wicket default implementation for the cache key used to reference the cached markup resource
 * stream.
 * 
 * @author Jonathan Locke
 * @author Juergen Donnerstag
 */
public class DefaultMarkupCacheKeyProvider implements IMarkupCacheKeyProvider
{
	/**
	 * Constructor.
	 */
	public DefaultMarkupCacheKeyProvider()
	{
	}

	/**
	 * Construct a proper key value for the cache
	 * 
	 * @param container
	 *            The container requesting the markup
	 * @param clazz
	 *            The clazz to get the key for
	 * @return Key that uniquely identifies any markup that might be associated with this markup
	 *         container.
	 */
	public String getCacheKey(final MarkupContainer container, final Class clazz)
	{
		final String classname = clazz.getName();
		final Locale locale = container.getLocale();
		// TODO until now getStyle() == style + variation
		final String style = container.getStyle();
		final String markupType = container.getMarkupType();

		final AppendingStringBuffer buffer = new AppendingStringBuffer(classname.length() + 64);
		buffer.append(classname);

		if (locale != null)
		{
			// TODO What is wrong with locale.toString()?!?
			final boolean l = locale.getLanguage().length() != 0;
			final boolean c = locale.getCountry().length() != 0;
			final boolean v = locale.getVariant().length() != 0;
			buffer.append(locale.getLanguage());
			if (c || (l && v))
			{
				buffer.append('_').append(locale.getCountry()); // This may just
				// append '_'
			}
			if (v && (l || c))
			{
				buffer.append('_').append(locale.getVariant());
			}
		}
		if (style != null)
		{
			buffer.append(style);
		}

		buffer.append(markupType);
		return buffer.toString();
	}
}