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.dynamic;
016    
017    import org.apache.tapestry5.corelib.components.Dynamic;
018    import org.apache.tapestry5.runtime.RenderCommand;
019    
020    /**
021     * A dynamic template is used by the {@link Dynamic} component to allow
022     * a component to significantly alter its presentation at runtime. An external
023     * template file provides most of the rendered content.
024     * 
025     * @since 5.3
026     * @see DynamicTemplateParser
027     */
028    public interface DynamicTemplate
029    {
030        /**
031         * Given a delegate (to assist with locating Blocks and evaluating expressions) ... create a
032         * RenderCommand that can be returned from a render phase method.
033         */
034        RenderCommand createRenderCommand(DynamicDelegate delegate);
035    }