/**

  * This file is part of the equanda project.

  *

  * The contents of this file are subject to the Mozilla Public License Version 1.1 (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.mozilla.org/MPL/

  *

  * Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF

  * ANY KIND, either express or implied. See the License for the specific language governing rights and

  * limitations under the License.

  *

  * Alternatively, the contents of this file may be used under the terms of

  * either the GNU General Public License Version 2 or later (the "GPL"), or

  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),

  * in which case the provisions of the GPL or the LGPL are applicable instead

  * of those above. If you wish to allow use of your version of this file only

  * under the terms of either the GPL or the LGPL, and not to allow others to

  * use your version of this file under the terms of the MPL, indicate your

  * decision by deleting the provisions above and replace them with the notice

  * and other provisions required by the GPL or the LGPL. If you do not delete

  * the provisions above, a recipient may use your version of this file under

  * the terms of any one of the MPL, the GPL or the LGPL.

  */

 package org.equanda.tapestry5.components;

 import org.apache.tapestry5.*;

 import org.apache.tapestry5.annotations.*;

 import org.apache.tapestry5.corelib.mixins.DiscardBody;

 import org.apache.tapestry5.dom.Element;

 import org.apache.tapestry5.ioc.annotations.Inject;

 import org.apache.tapestry5.ioc.services.SymbolSource;

 import org.apache.tapestry5.ioc.services.TypeCoercer;

 /**

  * Text Truncate Component

  * 

  * @author <a href="mailto:vladimir.tkachenko@gmail.com">Vladimir Tkachenko</a>

  */

 @SupportsInformalParameters

 public class Truncate

     implements ClientElement

 {

     /**

      * The text to be truncated

      */

     @Parameter( required = true, defaultPrefix = BindingConstants.PROP )

     private String text;

     /**

      * The max length of the text

      */

     @Parameter( defaultPrefix = BindingConstants.LITERAL )

     private Integer length;

     /**

      * The suffix

      */

     @Parameter( defaultPrefix = BindingConstants.LITERAL )

     private String suffix;

     /**

      * Injects SymbolSource object

      */

     @Inject

     private SymbolSource symbolSource;

     /**

      * Injects TypeCoercer object

      */

     @Inject

     private TypeCoercer typeCoercer;

     /**

      * Default binding for length parameter

      * 

      * @return default length

      */

     public Integer defaultLength()

     {

         return typeCoercer.coerce( symbolSource.valueForSymbol( "equanda.truncate.default.length" ), Integer.class );

     }

     /**

      * Default binding for suffix parameter

      * 

      * @return default suffix

      */

     public String defaultSuffix()

     {

         return symbolSource.valueForSymbol( "equanda.truncate.default.suffix" );

     }

     /**

      * Mixin that discards body rendering

      */

     @Mixin

     @SuppressWarnings( "unused" )

     private DiscardBody discardBody;

     @Environmental

     private RenderSupport renderSupport;

     @Inject

     private ComponentResources resources;

     @Inject

     @Path( "classpath:/org/equanda/tapestry5/resources/truncate.js" )

     private Asset script;

     @Inject

     @Path( "classpath:/org/equanda/tapestry5/resources/truncate.css" )

     private Asset style;

     private String assignedClientId;

     /**

      * Truncates text to specified length

      * 

      * @return truncated text

      */

     public String getTruncatedText()

     {

         int len = length;

         return text != null && text.length() > len ? ( text.substring( 0, len - suffix.length() ) + suffix ) : text;

     }

     public String getClientId()

     {

         return assignedClientId;

     }

     @SetupRender

     void setupRender()

     {

         assignedClientId = renderSupport.allocateClientId( resources.getId() ).toLowerCase();

     }

     /**

      * Renders truncated text

      * 

      * @param writer

      *            MarkupWriter used to render truncated text tag

      */

     @BeginRender

     void doBeginRender( MarkupWriter writer )

     {

         renderSupport.addScriptLink( script );

         renderSupport.addStylesheetLink( style, null );

         String text = getTruncatedText();

         if ( null == text ) text = "";

         writer.element( resources.getElementName() != null ? resources.getElementName() : "span", "id",

                 assignedClientId ).text( text );

         resources.renderInformalParameters( writer );

         writer.end();

     }

     /**

      * Renders full text tag

      * 

      * @param writer

      *            MarkupWriter used to render full text tag

      */

     @AfterRender

     void doAfterRender( MarkupWriter writer )

     {

         if ( text != null && text.length() > length )

         {

             Element root = writer.getDocument().getRootElement();

             Element body = null;

             if ( root != null )

             {

                 if ( root.getName().equals( "html" ) )

                 {

                     body = root.find( "body" );

                 }

             }

             String[] args = new String[] { "class", "equanda_truncate_content", "id", assignedClientId + "_text",

                     "style", "visibility: hidden; top: -1000px; left: 0;" };

             if ( body != null )

             {

                 Element element = body.element( "div", args );

                 element.text( text );

             }

             else

             {

                 Element element = writer.element( "div", (Object[]) args );

                 element.text( text );

                 writer.end();

             }

             renderSupport.addScript( "equandaTruncateInit('%s'); ", assignedClientId );

         }

     }

 }