Re: [cp-patches] RFC: implementation of getPackage for the vmreference

[Nicolas Geoffray]

Sorry, wrong changelog. Here it is.

2005-10-28  Nicolas Geoffray  <address@hidden>

   Reported by: Gael Thomas <address@hidden>
   * NEWS : added entry about new implementation of
   VMClassLoader.getPackage(s), and new method
   VMClassLoader.getBootPackages
   * vm/reference/java/lang/VMClassLoader.java:
   Added new definedPackages field to store packages
   loaded by the bootstrap classloader.
   Added new static initializer to create all packages
   which names are returned by getBootPackages
   (getBootPackages): new private method. Helper
   to get as a String[] the native package names
   (getPackage): uses the new definedPackages field
   (getPackages): uses the new definedPackages field
   * java/lang/Class.java:
   (getPackage): if the classloader of the class is null
   then call VMClassLoader.getPackage

Index: vm/reference/java/lang/VMClassLoader.java
===================================================================
RCS file: 
/cvsroot/classpath/classpath/vm/reference/java/lang/VMClassLoader.java,v
retrieving revision 1.32
diff -u -r1.32 VMClassLoader.java
--- vm/reference/java/lang/VMClassLoader.java   21 Oct 2005 10:47:17 -0000      
1.32
+++ vm/reference/java/lang/VMClassLoader.java   28 Oct 2005 08:35:47 -0000
@@ -40,6 +40,7 @@
 package java.lang;
 
 import gnu.classpath.SystemProperties;
+import gnu.classpath.Configuration;
 
 import java.io.File;
 import java.io.IOException;
@@ -63,6 +64,48 @@
  */
 final class VMClassLoader
 {
+
+
+  /** packages loaded by the bootstrap class loader */
+  static final HashMap definedPackages = new HashMap();
+
+  /**
+   * Converts the array string of native package names to
+   * Packages. The packages are then put into the
+   * definedPackages hashMap
+   */
+  static
+  {
+    String[] packages = getBootPackages();
+    
+    if( packages != null)
+      {
+        String specName = 
+              SystemProperties.getProperty("java.specification.name");
+        String vendor =
+              SystemProperties.getProperty("java.specification.vendor");
+        String version =
+              SystemProperties.getProperty("java.specification.version");
+        
+        Package p;
+              
+        for(int i = 0; i < packages.length; i++)
+          {
+            p = new Package(packages[i],
+                  specName,
+                  vendor,
+                  version,
+                  "GNU Classpath",
+                  "GNU",
+                  Configuration.CLASSPATH_VERSION,
+                  null);
+
+            definedPackages.put(packages[i], p);
+          }
+      }
+  }
+
+  
   /**
    * Helper to define a class using a string of bytes. This assumes that
    * the security checks have already been performed, if necessary.
@@ -190,29 +233,41 @@
     return v.elements();
   }
 
+
   /**
-   * Helper to get a package from the bootstrap class loader.  The default
-   * implementation of returning null may be adequate, or you may decide
-   * that this needs some native help.
+   * Returns a String[] of native package names. The default
+   * implementation returns an empty array, or you may decide
+   * this needs native help.
+   */
+  private static String[] getBootPackages()
+  {
+    return new String[0];
+  }
+
+
+  /**
+   * Helper to get a package from the bootstrap class loader.
    *
    * @param name the name to find
    * @return the named package, if it exists
    */
   static Package getPackage(String name)
   {
-    return null;
+    return (Package)definedPackages.get(name);
   }
 
+
+  
   /**
-   * Helper to get all packages from the bootstrap class loader.  The default
-   * implementation of returning an empty array may be adequate, or you may
-   * decide that this needs some native help.
+   * Helper to get all packages from the bootstrap class loader.  
    *
    * @return all named packages, if any exist
    */
   static Package[] getPackages()
   {
-    return new Package[0];
+    Package[] packages = new Package[definedPackages.size()];
+    definedPackages.values().toArray(packages);
+    return packages;
   }
 
   /**
Index: java/lang/Class.java
===================================================================
RCS file: /cvsroot/classpath/classpath/java/lang/Class.java,v
retrieving revision 1.40
diff -u -r1.40 Class.java
--- java/lang/Class.java        15 Sep 2005 14:42:36 -0000      1.40
+++ java/lang/Class.java        28 Oct 2005 08:37:34 -0000
@@ -594,7 +594,8 @@
     ClassLoader cl = getClassLoader();
     if (cl != null)
       return cl.getPackage(getPackagePortion(getName()));
-    return null;
+    else
+      return VMClassLoader.getPackage(getPackagePortion(getName()));
   }
 
   /**
Index: NEWS
===================================================================
RCS file: /cvsroot/classpath/classpath/NEWS,v
retrieving revision 1.99
diff -u -r1.99 NEWS
--- NEWS        21 Oct 2005 18:13:39 -0000      1.99
+++ NEWS        28 Oct 2005 08:37:43 -0000
@@ -16,6 +16,14 @@
   It can flatten graphs and, at least for the simple cases, is interoperable
   with Sun's jdk 1.5. 
 
+Runtime interface changes:
+
+* Changed implementation of VMClassLoader.getPackage(s) : new method
+  VMClassLoader.getBootPackages should be implemented by the vm, and sould
+  return a string array of boot package names ("java.lang", "java.net", ...).
+  Feedback from vm implementors for usability and relevance of the
+  getBootPackages method would be greatly appreciated.
+  
 New in release 0.18 (Sep 6, 2005)
 
 * GNU JAWT implementation, the AWT Native Interface, which allows direct