package at.gv.egiz.pdfas.web.helper;

import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

import javax.servlet.ServletContext;

import at.gv.egiz.pdfas.api.PdfAs;
import at.gv.egiz.pdfas.api.internal.PdfAsInternal;
import at.knowcenter.wag.egov.egiz.exceptions.WebException;

/**
 * Utility methods for easier handling of {@link PdfAs} API object.
 * 
 * @author exthex
 *
 */
public class ApiHelper {

   public static final String PDF_AS_OBJECT = "PDF_AS_OBJECT";

   public static final String INTERNAL_PDF_AS_OBJECT = "INTERNAL_PDF_AS_OBJECT";
   
   public static PdfAs createApiObject(File file) throws WebException {
      try {
         Class pdfAsClass = Class.forName("at.gv.egiz.pdfas.impl.api.PdfAsObject");
         Constructor constructor = pdfAsClass.getConstructor(new Class[]{File.class});
         PdfAs pdfAs = (PdfAs)constructor.newInstance(new Object[]{
               new File(WebSettingsReader.RESOURCES_PATH)});
         return pdfAs;
      } catch (ClassNotFoundException e) {
         throw new WebException(e);
      } catch (SecurityException e) {
         throw new WebException(e);
      } catch (NoSuchMethodException e) {
         throw new WebException(e);
      } catch (IllegalArgumentException e) {
         throw new WebException(e);
      } catch (InstantiationException e) {
         throw new WebException(e);
      } catch (IllegalAccessException e) {
         throw new WebException(e);
      } catch (InvocationTargetException e) {
         throw new WebException(e);
      }
   }
   
   public static PdfAsInternal createInternalApiObject() throws WebException {
      try {
         Class pdfAsClass = Class.forName("at.gv.egiz.pdfas.impl.api.internal.PdfAsInternalObject");
         PdfAsInternal pdfAsinternal = (PdfAsInternal)pdfAsClass.newInstance();
         return pdfAsinternal;
      } catch (ClassNotFoundException e) {
         throw new WebException(e);
      } catch (SecurityException e) {
         throw new WebException(e);
      } catch (InstantiationException e) {
         throw new WebException(e);
      } catch (IllegalAccessException e) {
         throw new WebException(e);
      }
   }

   public static PdfAs getPdfAsFromContext(ServletContext servletContext) {
      return (PdfAs)servletContext.getAttribute(PDF_AS_OBJECT);
   }

   public static PdfAsInternal getPdfAsInternalFromContext(ServletContext servletContext) {
      return (PdfAsInternal)servletContext.getAttribute(INTERNAL_PDF_AS_OBJECT);
   }

}