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Class calypso.util.URLClassLoader

java.lang.Object
   |
   +----java.lang.ClassLoader
           |
           +----calypso.util.URLClassLoader

A URL based class loader. This class knows how to load classes from a given base URL

public class  URLClassLoader
     extends java.lang.ClassLoader
{
          // Fields 6
     static final boolean XXXnoisy;
     private URL archiveURL;
     private Hashtable classes;
     private URL codeBaseURL;
     private TempFile fTempFile;
     private ZipFile fZipFile;

          // Constructors 1
     public URLClassLoader(URL, URL);

          // Methods 10
     private void copyURL(OutputStream, URL) throws IOException;
     protected void finalize();
     private synchronized Class findClass(String) throws ClassNotFoundException;
     public URL getCodeBaseURL();
     public Class loadClass(String) throws ClassNotFoundException;
     protected Class loadClass(String, boolean) throws ClassNotFoundException;
     private Class loadClass(String, URL, String) throws IOException;
     private Class loadClassFromArchive(String, URL, String) throws IOException;
     private byte[] readURL(URL) throws IOException;
     private byte[] readZipFile(String) throws IOException;
}

• classes

   private Hashtable classes

• codeBaseURL

   private URL codeBaseURL

• archiveURL

   private URL archiveURL

• fZipFile

   private ZipFile fZipFile

• fTempFile

   private TempFile fTempFile

• XXXnoisy

   static final boolean XXXnoisy

• URLClassLoader

   public URLClassLoader(URL aBaseURL, 
                         URL aArchiveURL) 

Create a new URL based class loader. aBaseURL specifies the URL to load classes relative to. If aArchiveURL is not null then the archive will be searched first (if it fails then the load will be attempted from aBaseURL).

• loadClass

   private Class loadClass(String name, 
                           URL url, 
                           String pathname)  throws IOException

Load a class from a URL. This does the actual work of loading the class and then defining it.

• loadClassFromArchive

   private Class loadClassFromArchive(String name, 
                                      URL url, 
                                      String pathname)  throws IOException

• loadClass

   public Class loadClass(String name)  throws ClassNotFoundException

Load a class from this class loader. This method is used by applets that want to explicitly load a class.

Overrides:

loadClass in class ClassLoader

• loadClass

   protected Class loadClass(String name, 
                             boolean resolve)  throws ClassNotFoundException

Load and resolve a class. This method is called by the java runtime to get a class that another class needs (e.g. a superclass).

Overrides:

loadClass in class ClassLoader

• findClass

   private synchronized Class findClass(String name)  throws ClassNotFoundException

This method finds a class. The returned class may be unresolved. This method has to be synchronized to avoid two threads loading the same class at the same time. Must be called with the actual class name.

• readURL

   private byte[] readURL(URL url)  throws IOException

• readZipFile

   private byte[] readZipFile(String aName)  throws IOException

Load a given file from the underlying zip file named "aName". Return an array of bytes which contain the decompressed contents of the file in the zip file.

• copyURL

   private void copyURL(OutputStream aOut, 
                        URL aURLSource)  throws IOException

• getCodeBaseURL

   public URL getCodeBaseURL() 

• finalize

   protected void finalize() 

Overrides:

finalize in class Object

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