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This project is simply a unified way of including common JS libraries within Wicket so that you don't have to bundle them in your application, and they aren't deployed with dozens of jars that may use them, but they are deployed in only one.

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/**
 * Copyright (C) 2009 Uwe Schaefer 
 *
 * 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.wicketstuff.jslibraries;

import java.util.HashMap;
import java.util.Map;

import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.JavaScriptHeaderItem;
import org.apache.wicket.markup.html.IHeaderContributor;
import org.wicketstuff.jslibraries.util.Assert;


public class LocalProvider implements Provider
{

	static final LocalProvider DEFAULT = new LocalProvider();
	private final Map localFileNames = new HashMap();
	private final Map localProductionSignifiers = new HashMap();

	private LocalProvider()
	{
		//
		localFileNames.put(Library.JQUERY, "jquery");
		localFileNames.put(Library.JQUERY_UI, "jquery-ui");
		localFileNames.put(Library.MOOTOOLS_CORE, "mootools-core");
		localFileNames.put(Library.MOOTOOLS_MORE, "mootools-more");
		localFileNames.put(Library.PROTOTYPE, "prototype");
		localFileNames.put(Library.SCRIPTACULOUS, "scriptaculous");
		localFileNames.put(Library.YUI, "yuiloader");
		localFileNames.put(Library.DOJO, "dojo");
		localFileNames.put(Library.SWFOBJECT, "swfobject");
		localFileNames.put(Library.EXT_CORE, "ext-core");
		//
		localProductionSignifiers.put(Library.JQUERY, ".min");
		localProductionSignifiers.put(Library.JQUERY_UI, ".min");
		localProductionSignifiers.put(Library.MOOTOOLS_CORE, ".min");
		localProductionSignifiers.put(Library.MOOTOOLS_MORE, ".min");
		localProductionSignifiers.put(Library.PROTOTYPE, null);
		localProductionSignifiers.put(Library.SCRIPTACULOUS, null);
		localProductionSignifiers.put(Library.YUI, ".min");
		localProductionSignifiers.put(Library.DOJO, ".min");
		localProductionSignifiers.put(Library.SWFOBJECT, ".min");
		localProductionSignifiers.put(Library.EXT_CORE, ".min");
	}

	public IHeaderContributor getHeaderContributor(final VersionDescriptor versionDescriptor,
		boolean production)
	{

		Assert.parameterNotNull(versionDescriptor, "versionDescriptor");

		return new HeaderContributor(versionDescriptor, production);
	}

	String getLocalFileName(Library lib)
	{
		Assert.parameterNotNull(lib, "lib");

		String name = localFileNames.get(lib);
		if (name == null)
			throw new IllegalArgumentException("Library '" + lib + "' is unknown to '" +
				getClass().getSimpleName() + "'");
		return name;
	}

	String getProductionSignifier(Library lib)
	{
		Assert.parameterNotNull(lib, "lib");

		String signifier = localProductionSignifiers.get(lib);
		return signifier;
	}

	private static class HeaderContributor implements IHeaderContributor
	{
		private static final long serialVersionUID = 1L;
		private final VersionDescriptor versionDescriptor;
		private final boolean production;

		public HeaderContributor(VersionDescriptor versionDescriptor, boolean production)
		{
			this.versionDescriptor = versionDescriptor;
			this.production = production;
		}

		public void renderHead(IHeaderResponse response)
		{
			response.render(JavaScriptHeaderItem.forReference(JSReference.getReference(versionDescriptor,
				production)));
		}
	}
}