package de.mpg.mpiwg.berlin.mpdl.externalObjects.app;

import java.util.Date;

import de.mpg.mpiwg.berlin.mpdl.exception.ApplicationException;
import de.mpg.mpiwg.berlin.mpdl.util.XmlUtil;

public class ExtElement extends ExtObject {
  private String pageNumber;
  private String xmlNodeId;
  private String before;
  private String charPos;
  private String xpath;

  public static ExtElement parseXmlStr(String xmlStr) throws ApplicationException {
    XmlUtil xmlUtil = XmlUtil.getInstance();
    String uid = xmlUtil.evaluateToString(xmlStr, "/object/@uid", null);
    String dateStr = xmlUtil.evaluateToString(xmlStr, "/object/@modificationDate", null);
    String docId = xmlUtil.evaluateToString(xmlStr, "/object/@documentId", null);
    String pageNumber = xmlUtil.evaluateToString(xmlStr, "/object/@pageNumber", null);
    String xmlNodeId = xmlUtil.evaluateToString(xmlStr, "/object/@xmlNodeId", null);
    String before = xmlUtil.evaluateToString(xmlStr, "/object/@before", null);
    String charPos = xmlUtil.evaluateToString(xmlStr, "/object/@charPos", null);
    String xpath = xmlUtil.evaluateToString(xmlStr, "/object/@xpath", null);
    String content = xmlUtil.evaluateToXmlString(xmlStr, "/object/content/*", null);
    Date modDate = xmlUtil.toDate(dateStr);
    if (uid == null || docId == null || pageNumber == null)
      throw new ApplicationException("one of the required fields could not be read in: " + xmlStr);
    ExtElement e = new ExtElement();
    e.setUid(uid);
    e.setModificationDate(modDate);
    e.setDocumentId(docId);
    e.setPageNumber(pageNumber);
    e.setXmlNodeId(xmlNodeId);
    e.setXpath(xpath);
    e.setBefore(before);
    e.setCharPos(charPos);
    e.setContent(content);
    return e;
  }

  public String toString() {
    return getXmlString();
  }
  
  public String getXmlString() {
    String xmlString = "<object";
    if (uid != null)
      xmlString = xmlString + " uid=\"" + uid + "\"";
    if (documentId != null)
      xmlString = xmlString + " documentId=\"" + documentId + "\"";
    if (pageNumber != null)
      xmlString = xmlString + " pageNumber=\"" + pageNumber + "\"";
    if (xmlNodeId != null)
      xmlString = xmlString + " xmlNodeId=\"" + xmlNodeId + "\"";
    if (before != null)
      xmlString = xmlString + " before=\"" + before + "\"";
    if (charPos != null)
      xmlString = xmlString + " charPos=\"" + charPos + "\"";
    if (xpath != null)
      xmlString = xmlString + " xpath=\"" + xpath + "\"";
    if (modificationDate != null) {
      XmlUtil xmlUtil = XmlUtil.getInstance();
      String dateStr = xmlUtil.toXsDate(modificationDate);
      xmlString = xmlString + " modificationDate=\"" + dateStr + "\"";
    }
    xmlString = xmlString + ">";
    if (content != null) {
      // write the uid and modificationDate into the content node
      if (! content.contains("uid")) {
        int firstClose = content.indexOf(">");
        if (firstClose != -1)
          content = content.substring(0, firstClose) + " uid=\"" + uid + "\" modificationDate=\"" + modificationDate + "\" " + content.substring(firstClose);
      }
      xmlString = xmlString + "<content>" + content + "</content>";
    }
    xmlString = xmlString + "</object>";
    return xmlString;
  }
  
  public String getXpath() {
    return xpath;
  }

  public void setXpath(String xpath) {
    this.xpath = xpath;
  }

  public String getXmlNodeId() {
    return xmlNodeId;
  }

  public void setXmlNodeId(String xmlNodeId) {
    this.xmlNodeId = xmlNodeId;
  }

  public String getCharPos() {
    return charPos;
  }

  public void setCharPos(String charPos) {
    this.charPos = charPos;
  }

  public String getPageNumber() {
    return pageNumber;
  }

  public void setPageNumber(String pageNumber) {
    this.pageNumber = pageNumber;
  }

  public String getBefore() {
    return before;
  }

  public void setBefore(String before) {
    this.before = before;
  }

}