001/* 
002    Licensed to the Apache Software Foundation (ASF) under one
003    or more contributor license agreements.  See the NOTICE file
004    distributed with this work for additional information
005    regarding copyright ownership.  The ASF licenses this file
006    to you under the Apache License, Version 2.0 (the
007    "License"); you may not use this file except in compliance
008    with the License.  You may obtain a copy of the License at
009
010       http://www.apache.org/licenses/LICENSE-2.0
011
012    Unless required by applicable law or agreed to in writing,
013    software distributed under the License is distributed on an
014    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015    KIND, either express or implied.  See the License for the
016    specific language governing permissions and limitations
017    under the License.  
018*/
019package org.apache.wiki.parser;
020
021import org.apache.commons.lang.StringEscapeUtils;
022import org.jdom2.Text;
023import org.apache.wiki.WikiContext;
024import org.apache.wiki.api.exceptions.NoSuchVariableException;
025import org.apache.wiki.render.RenderingManager;
026
027/**
028 *  Stores the contents of a WikiVariable in a WikiDocument DOM tree.
029 *  <p>
030 *  When the WikiDocument is rendered, if the {@link RenderingManager#WYSIWYG_EDITOR_MODE}
031 *  is set to {@link Boolean#TRUE}, the variable declaration is rendered instead
032 *  of the variable value.
033 *
034 *  @since  2.4
035 */
036public class VariableContent extends Text
037{
038    private static final long serialVersionUID = 1L;
039
040    private String m_varName;
041    
042    /**
043     *  Create a VariableContent for the given variable.
044     *  
045     *  @param varName The name of the variable.
046     */
047    public VariableContent( String varName )
048    {
049        m_varName = varName;
050    }
051    
052    /**
053     *   Evaluates the variable and returns the contents. 
054     *   
055     *   @return The rendered value of the variable.
056     */
057    public String getValue()
058    {
059        String result = "";
060        WikiDocument root = (WikiDocument) getDocument();
061
062        if( root == null )
063        {
064            // See similar note in PluginContent
065            return m_varName;
066        }
067        
068        WikiContext context = root.getContext();
069
070        if( context == null )
071            return "No WikiContext available: INTERNAL ERROR";
072    
073        Boolean wysiwygEditorMode = (Boolean)context.getVariable(RenderingManager.WYSIWYG_EDITOR_MODE);
074        
075        if( wysiwygEditorMode != null && wysiwygEditorMode.booleanValue() )
076        {
077            result = "[" + m_varName + "]";
078        }
079        else
080        {
081            try
082            {
083                result = context.getEngine().getVariableManager().parseAndGetValue( context, m_varName );
084            }
085            catch( NoSuchVariableException e )
086            {
087                result = MarkupParser.makeError( "No such variable: " + e.getMessage() ).getText(); 
088            }
089        }
090
091        return StringEscapeUtils.escapeXml( result );
092    }
093    
094    /**
095     *  Returns exactly getValue().
096     *  @return Whatever getValue() returns.
097     */
098    public String getText()
099    {
100        return getValue();
101    }
102
103    /**
104     *  Returns a debug-suitable string.
105     *  @return Debug string
106     */
107    public String toString()
108    {
109        return "VariableElement[\""+m_varName+"\"]";
110    }
111}