org.apache.myfaces.custom.jsvalueset.HtmlJsValueSetRenderer Maven / Gradle / Ivy

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JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF1.2 features. A JSF1.2 implementation is required to use this version of the Tomahawk library.
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/*
 * 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.apache.myfaces.custom.jsvalueset;

import org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils;
import org.apache.myfaces.shared_tomahawk.renderkit.html.HTML;
import org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlRenderer;

import org.apache.commons.lang.StringEscapeUtils;
import javax.faces.application.Application;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import java.io.IOException;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;

/**
 * @JSFRenderer
 *   renderKitId = "HTML_BASIC" 
 *   family = "javax.faces.Output"
 *   type = "org.apache.myfaces.JsValueSet"
 * 
 * @author Martin Marinschek (latest modification by $Author: lu4242 $)
 * @version $Revision: 659874 $ $Date: 2008-05-24 15:59:15 -0500 (Sat, 24 May 2008) $
 */
public class HtmlJsValueSetRenderer
extends HtmlRenderer
{
   private void writeValue(String varName, StringBuffer valueSb, StringBuffer prependSb, Object value) throws IOException 
   {
      if(value instanceof String || value instanceof Number || value instanceof Boolean || value == null) 
      {
         valueSb.append(getValueString(value));
      }
      else if(value instanceof Object[])
      {
         Object[] objs = (Object[]) value;
         
         valueSb.append("[");
         
         String comma = "";
         for (int i = 0; i < objs.length; i++) 
         {
            valueSb.append(comma);
            writeValue(varName + "_h" + i, valueSb, prependSb, objs[i]);
            comma = ",";
         }
         
         valueSb.append("]");
      }
      else if(value instanceof Collection)
      {
         Collection coll = (Collection) value;
         
         valueSb.append("[");
         
         String comma = "";
         int i = 0;
         for (Iterator iterator = coll.iterator(); iterator.hasNext();) 
         {
            valueSb.append(comma);
            writeValue(varName + "_h" + i, valueSb, prependSb, iterator.next());
            comma = ",";
            i++;
         }
         
         valueSb.append("]");
      }
      else if(value instanceof Map)
      {
         Map map = (Map) value;
         
         varName = varName + "_hm";
          prependSb.append("var ").append(varName).append("=new Object();\n");
         
         Iterator it = map.entrySet().iterator();
         int i = 0;
         while (it.hasNext()) 
         {
            Map.Entry entry = (Map.Entry) it.next();
            StringBuffer helpValueSb = new StringBuffer();
            StringBuffer helpHelpSb = new StringBuffer();
            writeValue(varName + "_h" + i, helpValueSb, helpHelpSb, entry.getValue());
            
            prependSb.append(helpHelpSb);
             prependSb.append(varName).append("[").append(getValueString(entry.getKey())).append("]=");
             prependSb.append(helpValueSb).append(";\n");
            
            i++;
         }
         
         valueSb.append(varName);
      }
      else
         throw new IOException("Type of value not handled. Allowed are String, Number, Boolean, Object[], Collection, Map. Type of value : "+value.getClass());
      
   }
   
   public void encodeEnd(FacesContext facesContext, UIComponent component)
   throws IOException
   {
      RendererUtils.checkParamValidity(facesContext, component, HtmlJsValueSet.class);
      
      HtmlJsValueSet jsValue = (HtmlJsValueSet) component;
      
      Object value = jsValue.getValue();
      String varName = jsValue.getName();
      
      
      ResponseWriter writer = getFacesContext().getResponseWriter();
      
      writer.startElement(HTML.SCRIPT_ELEM, null);
      writer.writeAttribute(HTML.SCRIPT_TYPE_ATTR, HTML.SCRIPT_TYPE_TEXT_JAVASCRIPT, null);
      
      StringBuffer valueSb = new StringBuffer("var " + varName + "=");
      StringBuffer prependSb = new StringBuffer("");
      
      writeValue(varName, valueSb, prependSb, value);
      
      writer.write(prependSb.toString());
      writer.write(valueSb.toString() + ";\n");
      
      writer.endElement(HTML.SCRIPT_ELEM);
   }
   
   
   private String getValueString(Object value) throws IOException
   {
      if(value instanceof String)
      {
         return "'"+StringEscapeUtils.escapeJavaScript(value.toString())+"'";
      }
      else if(value instanceof Number)
      {
         return value.toString();
      }
      else if(value instanceof Boolean)
      {
         return value.toString();
      }
      else if(value == null)
      {
         return "null";
      }
      else
      {
         throw new IOException("value : "+value+" is of type : "+value.getClass()+
         ", provide a method to convert this.");
      }
   }
   
   protected Application getApplication()
   {
      return getFacesContext().getApplication();
   }
   
   protected FacesContext getFacesContext()
   {
      return FacesContext.getCurrentInstance();
   }
   
}