001    // Copyright 2011 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    // http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.services.javascript;
016    
017    import org.apache.tapestry5.ioc.services.SymbolSource;
018    import org.apache.tapestry5.services.AssetSource;
019    
020    /**
021     * Defines the types of extensions to a JavaScript stack that can be contributed to an extensible JavaScript stack.
022     * 
023     * @since 5.3
024     * @see StackExtension
025     * @see ExtensibleJavaScriptStack
026     */
027    public enum StackExtensionType
028    {
029        /**
030         * A JavaScript library. The extension value will be converted using {@link AssetSource#getExpandedAsset(String)},
031         * meaning that {@linkplain SymbolSource symbols} will be expanded.
032         */
033        LIBRARY,
034    
035        /**
036         * A stylesheet. The extension value will be converted using {@link AssetSource#getExpandedAsset(String)},
037         * meaning that {@linkplain SymbolSource symbols} will be expanded.
038         */
039        STYLESHEET,
040    
041        /** Extra JavaScript initialization (rarely used). No symbol expansion takes place. */
042        INITIALIZATION;
043    }