001    // Copyright 2004, 2005 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    package org.apache.tapestry.markup;
015    
016    import org.apache.tapestry.IMarkupWriter;
017    
018    
019    /**
020     * Represents a DOM style attribute that is used by {@link IMarkupWriter} to 
021     * manage rendering attributes.
022     * 
023     * @author jkuhnert
024     */
025    public interface Attribute
026    {
027        /**
028         * Retrieves the current value for the attribute.
029         * 
030         * @return The current value for the attribute.
031         */
032        Object getValue();
033        
034        /**
035         * Whether or not this attribute should be written out in raw form 
036         * as specified by {@link IMarkupWriter#attribute(String, boolean)} .
037         * 
038         * @return True if content will be written in raw form, false otherwise.
039         */
040        boolean isRaw();
041    }