PC Pro 1997 December/PC Pro December 1997 CD-Rom coverdisc.iso/symantec/dbAnywh/JAVA.BIN/CLASSES.ZIP/sun/applet/AppletClassLoader.class

Java Class File | 1996-12-14 | 4.4 KB | 162 lines

package sun.applet;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Hashtable;
import sun.misc.MessageUtils;

class AppletClassLoader extends ClassLoader {
   boolean verboseClassLoading = false;
   Hashtable classes = new Hashtable();
   URL base;

   AppletClassLoader(URL var1) {
      this.base = var1;
   }

   private Class loadClass(URL var1) throws IOException {
      InputStream var2 = null;

      try {
         Class var18;
         try {
            URLConnection var5 = var1.openConnection();
            var5.setAllowUserInteraction(false);
            var2 = var5.getInputStream();
            int var6 = var5.getContentLength();
            byte[] var7 = new byte[var6 == -1 ? 4096 : var6];
            int var8 = 0;
            Thread var10 = Thread.currentThread();

            int var9;
            while((var9 = var2.read(var7, var8, var7.length - var8)) >= 0 && !var10.isInterrupted()) {
               if ((var8 += var9) == var7.length) {
                  if (var6 >= 0) {
                     break;
                  }

                  byte[] var11 = new byte[var8 * 2];
                  System.arraycopy(var7, 0, var11, 0, var8);
                  var7 = var11;
               }
            }

            if (var10.isInterrupted()) {
               throw new IOException("class loading interrupted: " + var1);
            }

            var18 = ((ClassLoader)this).defineClass(var7, 0, var8);
         } finally {
            if (var2 != null) {
               var2.close();
            }

         }

         return var18;
      } catch (IOException var16) {
         ((Throwable)var16).printStackTrace();
         throw var16;
      } catch (Throwable var17) {
         var17.printStackTrace();
         throw new IOException("class not loaded: " + var1);
      }
   }

   public Class loadClass(String var1) throws ClassNotFoundException {
      return this.loadClass(var1, true);
   }

   protected Class loadClass(String var1, boolean var2) throws ClassNotFoundException {
      Class var3 = (Class)this.classes.get(var1);
      if (var3 == null) {
         SecurityManager var4 = System.getSecurityManager();
         if (var4 != null) {
            int var5 = var1.lastIndexOf(46);
            if (var5 >= 0) {
               var4.checkPackageAccess(var1.substring(0, var5));
            }
         }

         try {
            return ((ClassLoader)this).findSystemClass(var1);
         } catch (Throwable var6) {
            var3 = this.findClass(var1);
         }
      }

      if (var3 == null) {
         throw new ClassNotFoundException(var1);
      } else {
         if (var2) {
            ((ClassLoader)this).resolveClass(var3);
         }

         return var3;
      }
   }

   void errorMsg(String var1, String var2) {
      System.err.println(MessageUtils.substProp("appletloader." + var1, var2));
   }

   void errorMsg(String var1, String var2, String var3) {
      System.err.println(MessageUtils.substProp("appletloader." + var1, var2, var3));
   }

   private synchronized Class findClass(String var1) {
      Class var2 = (Class)this.classes.get(var1);
      if (var2 != null) {
         return var2;
      } else {
         if (this.verboseClassLoading) {
            System.out.println(Thread.currentThread().getName() + " find class " + var1);
         }

         SecurityManager var3 = System.getSecurityManager();
         if (var3 != null) {
            int var4 = var1.lastIndexOf(46);
            if (var4 >= 0) {
               var3.checkPackageDefinition(var1.substring(0, var4));
            }
         }

         String var14 = var1.replace('.', '/') + ".class";

         try {
            URL var5 = new URL(this.base, var14);
            if (this.verboseClassLoading) {
               System.out.println("Opening stream to: " + var5 + " to get " + var1);
            }

            var2 = this.loadClass(var5);
            if (!var1.equals(var2.getName())) {
               Class var6 = var2;
               Object var13 = null;
               throw new ClassFormatError(var1 + " != " + var6.getName());
            }

            this.classes.put(var1, var2);
         } catch (FileNotFoundException var7) {
            this.errorMsg("filenotfound", var1);
         } catch (ClassFormatError var8) {
            this.errorMsg("fileformat", var1);
         } catch (IOException var9) {
            this.errorMsg("fileioexception", var1);
         } catch (Exception var10) {
            this.errorMsg("fileexception", ((Throwable)var10).toString(), var1);
         } catch (ThreadDeath var11) {
            this.errorMsg("filedeath", var1);
            throw var11;
         } catch (Error var12) {
            this.errorMsg("fileerror", ((Throwable)var12).toString(), var1);
         }

         return var2;
      }
   }
}