/*
 * @author  : Elangovan
 * @version : 1.0
 *
 * Development Environment : Oracle9i JDeveloper

 * Name of the File        : ExternRequest.java
 *
 * Creation / Modification History
 *    Elangovan           12-Dec-2002        Created
 *
 */


package oracle.otnsamples.cmsxdb.admin;

import org.w3c.dom.Element;

import java.sql.SQLException;

import oracle.xdb.XMLType;


import oracle.otnsamples.cmsxdb.ConnParams;

/**
 * This class encapsulates a Externalize request.
 */
public class ExternRequest  {

  private String resourceUrl = null;
  private String xslLocation = null;

  private String contentType = null;

  // Message Id of message in request queue
  private String messageId = null;
  private String url       = null;

  // Status of extern
  private String status = null;

  /**

   * Constructs a new ExternRequest object with the specified resource url,
   * content type, xsl location and message id.
   * 
   * @param resUrl      XDBUri of Resource 
   * @param contentType Content type of resource after applying XSL
   * @param xslLocation XDBUri of XSL to be applied on resource
   * @param messageId   Message Id of this Externalization request
   */
  public ExternRequest(String resUrl, String contentType, String xslLocation,
                        String messageId  ) {
    this.resourceUrl = resUrl;

    this.contentType = contentType;
    this.xslLocation = xslLocation;
    this.messageId = messageId;
    makeUrl();
  }

  /**
   * Constructs a new ExternRequest with message id and externalization details
   * from requestXML.
   * 
   * @param msgId      Message Id of this Externalization request
   * @param requestXML XMLType instance that contains externalization details

   */
  public ExternRequest(  String msgId, XMLType requestXML ) 
    throws SQLException {

    Element rootElement = requestXML.getDOM().getDocumentElement();
    
    this.resourceUrl = getNodeValue( rootElement, "ResourceURL");     
    this.xslLocation = getNodeValue( rootElement, "XSLLocation" );   
    this.contentType = getNodeValue( rootElement, "ContentType");
    this.messageId = msgId;
    makeUrl();
    
  }


  /**
   * Returns the String representation of Resource XDBUri.
   * 
   * @return String representation of Resource XDBUri
   */
  public String getResourceUrl( ) { 
    return resourceUrl; 
  }

  /**
   * Returns the String representation of XSL XDBUri.
   * 
   * @return String representation of XSL XDBUri

   */
  public String getXSLLocation( ) { 
    return xslLocation; 
  }

  /**
   * Returns the Content type.
   * 
   * @return content type of resource after applying XSL
   */
  public String getContentType( ) {
    return contentType; 
  }

  /**

   * Returns the Message of this request.
   * 
   * @return message if this request
   */
  public String getMessageId( ) { 
    return messageId; 
  }

  /**
   * Returns the status of externalization.
   * 
   * @return the status of externalization
   */
  public String getStatus( ) { 
    return status; 
  }


  /**
   * Updates the status of this externalization request.
   * 
   * @param status status of this externalization request
   */
  public void setStatus(String status) { 
    this.status = status; 
  }
  
  /**
   * Returns the complete url for this resource, which includes XSL and content
   * type.
   * 
   * @return the url for TransformServlet
   */
  public String getUrl( ) { 

    return url; 
  }

  /**
   * Constructs a url for TransformServlet.
   */
  private void makeUrl( ) {
  
      StringBuffer servletUrl = new StringBuffer(ConnParams.dbTransServlet)
                                .append("?resource=")
                                .append(resourceUrl);
                                
      // Generate file to relative path specified by the resource
      if( contentType != null && contentType != "" ) {
        servletUrl.append( "&contenttype=" ).append( contentType );            
      }
      
      if( xslLocation != null && xslLocation != "" ) {

        servletUrl.append( "&transform=" ).append( xslLocation );            
      }  
        
     url = servletUrl.toString( );
    
  }

  /** 
   * Return the String representation of this Class. This method overrides the
   * toString() method in java.lang.Object
   * 
   * @return String representation of this Class.   
   */
  public String toString( ) {
    return new StringBuffer( ).append( resourceUrl + "," + xslLocation + ","  +
                                       "," + contentType ).toString( );
  }

  /**

   * Returns the value of the Node under the given Element.
   * 
   * @param elem     XML Element to be parsed
   * @param nodeName Node name for which value is required
   * 
   * @return value of Node under the specified Element.
   */
  private String getNodeValue( Element elem, String nodeName ) {
  
    String retVal = "";
    
    try {
    
      retVal = elem.getElementsByTagName(nodeName).item(0).getFirstChild().getNodeValue();   
      
    } catch( Exception ex ) { }
    
    return retVal;
    
  }

  
}