ContentPreviewForm.java :  » Portal » DLOG4J » dlog4j » formbean » Java Open Source

/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Library General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
package dlog4j.formbean;

import org.apache.commons.lang.StringUtils;
import org.htmlparser.Node;
import org.htmlparser.NodeFilter;
import org.htmlparser.Parser;
import org.htmlparser.tags.TableTag;
import org.htmlparser.util.NodeList;

/**
 * 
 * @author Liudong
 */
public class ContentPreviewForm extends DlogActionForm {

  public final static int MAX_COUNT = 400;
  public final static int MAX_COUNT2 = 1000;
  public static int BRIEF_LENGTH = 25;
  
    String content = null;
    
  public String getBrief() {
      //
    if (content == null)
      return "";
    String ct = StringUtils.replace(content," ","");    
    StringBuffer brief = new StringBuffer(256);
    int cur = 0;
    do {
        int idx = ct.indexOf('<',cur);
        if(idx==-1) {
            brief.append(ct.substring(cur));
            break;
        }
        else {
          brief.append(ct.substring(cur,idx));
          cur = ct.indexOf('>',idx);
          if(cur==-1)
              break;
          cur++;
        }
    }while(true);
    String text = StringUtils.left(brief.toString().trim(),BRIEF_LENGTH);
    if(text==null||text.length()==0)
        text = "[]";
    else
        text = StringUtils.replace(text,"&nbsp;"," ");
    
    return text.trim();
  }
  
  /**
   * HTML
   * @return
   */
  public String getPreviewContent(){
    String ct = StringUtils.left(content,MAX_COUNT);
    try {
        //N
    if(ct!=null&&content!=null) {
        int idx2 = ct.lastIndexOf('>');
        int idx1 = ct.lastIndexOf('<');
        if((idx2==-1 && idx1>=0) || idx1 > idx2) {
            String ct2 = content.substring(ct.length());
            int idx3 = ct2.indexOf('>');
            if(idx3!=-1 && idx3<(MAX_COUNT2-MAX_COUNT)) {
                ct += content.substring(ct.length(),ct.length()+idx3+1);
            }
        }
    }
    if(ct!=null&&content!=null) {
        int idx2 = ct.toLowerCase().lastIndexOf("</object>");
        int idx1 = ct.toLowerCase().lastIndexOf("<object");
        if((idx2==-1 && idx1>=0) || idx1 > idx2) {
            String ct2 = content.substring(ct.length()).toLowerCase();
            int idx3 = ct2.indexOf("</object>");
            if(idx3!=-1) 
                ct += content.substring(ct.length(),ct.length()+idx3+9);                
            else 
                ct = ct.substring(0,idx1);            
        }
    }
    if(ct!=null&&content!=null) {
        //System.out.println(ct);
        int idx1 = ct.toLowerCase().lastIndexOf("<div align='right'><font color='#cccccc' size='1'>[edit");        
        int idx2 = ct.toLowerCase().lastIndexOf("]</font></div>");
        //System.out.println("idx1="+idx1+",idx2="+idx2);
        if((idx1>=0 && idx2==-1) || idx1 > idx2){
            String ct2 = content.substring(ct.length());
            int idx3 = ct2.toLowerCase().indexOf("]</font></div>");
            if(idx3!=-1) 
                ct += content.substring(ct.length(),ct.length()+idx3+14);
            else
                ct = ct.substring(0,idx1);            
        }
    }
    if(ct!=null&&content!=null) {
          Parser parser = Parser.createParser(new String(ct.getBytes(),ISO8859_1));
          Node [] tables = parser.extractAllNodesThatAre (TableTag.class);
          if(tables!=null&&tables.length>0) {
              TableTag tableTag = (TableTag)tables[0];
              ct = ct.substring(0,tableTag.getStartPosition()) + new String(tableTag.toHtml().getBytes(ISO8859_1));
          }
    }
    pc_len = ct.length();
    }catch(NullPointerException e) {
    }catch(Exception e) {
        e.printStackTrace();
    }
    return ct;
  }
  
  int pc_len = -1;
  
  public String getOtherContent() {
      if(content!=null) {
          if(pc_len==-1)
              pc_len = getPreviewContent().length();
          int pl = (pc_len==-1)?0:pc_len;
          int cl = getContent().length()-pl;
          if(cl>0)
              return content.substring(pl);
      }
      return null;
  }

    public String getContent() {
        return content;
    }
    
    public String getWmlContent(){
      try{
        return extractText(content);
      }catch(Exception e){}
      return null;
    }
    public void setContent(String content) {
        this.content = content;
    }

    /**
    * 
    * 
    * @param inputHtml
    * @return
    */
  protected static String extractText(String inputHtml) throws Exception {
    StringBuffer text = new StringBuffer();
    Parser parser = Parser.createParser(new String(inputHtml.getBytes(),ISO8859_1));
    //
    NodeList nodes = parser.extractAllNodesThatMatch(new NodeFilter() {
      public boolean accept(Node node) {
        return true;
      }
    });
    for(int i=0;i<nodes.size();i++){
      Node node = nodes.elementAt(i);
      text.append(new String(node.toPlainTextString().getBytes(ISO8859_1)));
    }
    return text.toString();
  }

    public static void main(String[] args) {
        String ct = "<A href=\"http://www.javayou.com/dlog/showlog.asp?log_id=534\" target=_blank><FONT color=#ff0000 size=3><STRONG></STRONG></FONT></A> <DIV align=right><FONT color=#cccccc size=1>[Edit&nbsp;on&nbsp;2004-03-11 14:18:31&nbsp;By&nbsp;]</FONT></DIV>";
        ContentPreviewForm cpf = new ContentPreviewForm();
        cpf.setContent(ct);
        System.out.println(cpf.getPreviewContent());
    }
    private final static String ISO8859_1 = "8859_1";
}