package com.instantbank.collections.main.web;

import java.io.ByteArrayInputStream;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
import oracle.xml.parser.v2.DOMParser;
import oracle.xml.parser.v2.XMLDocument;

public class DomParserTag extends TagSupport {
  private String xml;
  private boolean force = false;


  public void setXml(String xml) {
    this.xml = xml;
  }


  public void setId(String id) {
    this.id = id;
  }


  public void setForce(boolean force) {
    this.force = force;
  }


  public int doStartTag() throws JspException {
    XMLDocument doc = (XMLDocument)pageContext.getServletContext().getAttribute(id);
    if(doc == null || force) {
      parse();
    }
    return SKIP_BODY;
  }


  private void parse() throws JspException {
    XMLDocument doc;
    DOMParser docParser = new DOMParser();
    ByteArrayInputStream stream;

    try {
      stream = new ByteArrayInputStream(xml.getBytes());
      docParser.setValidationMode(false);
      docParser.parse(stream);
      doc = docParser.getDocument();
      pageContext.setAttribute(id, doc, PageContext.PAGE_SCOPE);
    }
    catch(Exception e) {
      throw new JspException(e.getMessage());
    }
  }


  public void release() {
    xml = null;
    force = false;
  }
}