org.wicketstuff.jslibraries.CDN Maven / Gradle / Ivy

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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.net.MalformedURLException;
import java.net.URL;
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 enum CDN implements Provider
{

	GOOGLE
	{

		private volatile Map renderers;

		@Override
		public URL render(final Library lib, final Version version, boolean production)
		{
			Assert.parameterNotNull(lib, "lib");
			Assert.parameterNotNull(version, "version");

			if (renderers == null)
			{
				renderers = new HashMap();
				renderers.put(Library.JQUERY, new GoogleRenderer("jquery", "jquery", ".js",
					".min.js"));
				renderers.put(Library.JQUERY_UI, new GoogleRenderer("jqueryui", "jquery-ui", ".js",
					".min.js"));
				renderers.put(Library.MOOTOOLS_CORE, new GoogleRenderer("mootools", "mootools",
					".js", "-yui-compressed.js"));
				renderers.put(Library.PROTOTYPE,
					new GoogleRenderer("prototype", "prototype", ".js"));
				renderers.put(Library.SCRIPTACULOUS, new GoogleRenderer("scriptaculous",
					"scriptaculous", ".js"));
				renderers.put(Library.YUI, new GoogleRenderer("yui", "build/yuiloader/yuiloader",
					".js", "-min.js"));
				renderers.put(Library.DOJO, new GoogleRenderer("dojo", "dojo/dojo.xd.js",
					".uncompressed.js", ""));
				renderers.put(Library.SWFOBJECT, new GoogleRenderer("swfobject", "swfobject",
					"_src.js", ".js"));
				renderers.put(Library.EXT_CORE, new GoogleRenderer("ext-core", "ext-core",
					"-debug.js", ".js"));
			}
			URLRenderer r = renderers.get(lib);
			if (r == null)
			{
				return null;
			}
			return r.render(lib, version, production);
		}
	}

	,
	YAHOO
	{

		@Override
		public URL render(Library lib, Version version, boolean production)
		{
			Assert.parameterNotNull(version, "version");
			Assert.parameterNotNull(lib, "lib");

			if (lib == Library.YUI)
			{
				String sign = production ? "-min" : "";
				try
				{
					return new URL("http://yui.yahooapis.com/" + version.renderVersionNumbers() +
						"/build/yuiloader/yuiloader" + sign + ".js");
				}
				catch (MalformedURLException e)
				{
					throw new IllegalStateException("Construction of Yahoo-URL failed.", e);
				}
			}
			return null;
		}

	};

	protected abstract URL render(Library lib, Version v, boolean production);

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

		Assert.parameterNotNull(versionDescriptor, "versionDescriptor");

		Library lib = versionDescriptor.getLibrary();
		Version v = versionDescriptor.getVersion(this);
		if (lib.getVersions(this).contains(v))
		{
			URL url = render(lib, v, production);
			if (url != null)
			{
				return new HeaderContributor(url.toExternalForm());
			}
		}
		return null;
	}

	static class GoogleRenderer implements URLRenderer
	{
		private static final String URL_PREFIX = "http://ajax.googleapis.com/ajax/libs/";
		private final String path;
		private final String file;
		private final String suffix;
		private final String productionSuffix;

		private GoogleRenderer(final String path, final String file, final String suffix,
			final String productionSuffix)
		{
			this.path = path;
			this.file = file;
			this.suffix = suffix;
			this.productionSuffix = productionSuffix;
		}

		private GoogleRenderer(final String path, final String file, final String suffix)
		{
			this(path, file, suffix, suffix);
		}

		public URL render(final Library lib, final Version v, boolean production)
		{
			Assert.parameterNotNull(lib, "lib");
			Assert.parameterNotNull(v, "v");

			String version = v.renderVersionNumbers();
			String spec = URL_PREFIX + path + "/" + version + "/" + file +
				(production ? productionSuffix : suffix);
			try
			{
				return new URL(spec);
			}
			catch (MalformedURLException e)
			{
				throw new IllegalArgumentException(e);
			}
		}
	}

	public static final CDN[] ANY = values();

	private static class HeaderContributor implements IHeaderContributor
	{
		private static final long serialVersionUID = 1L;
		private final String url;

		public HeaderContributor(String url)
		{
			this.url = url;
		}

		public void renderHead(IHeaderResponse response)
		{
			response.render(JavaScriptHeaderItem.forUrl(url));
		}
	}
}