partial 1.4 Throwable compatiblity

[Colin Walters]

Hello,

What's the word with respect to JDK 1.4 compatibility and Classpath?
Are patches accepted for this yet?

Here's a small patch which implements part of the new 1.4 "chained
exception" facility in the example native code:

--- Throwable.java.~1.1.~       Sun Dec 10 12:42:10 2000
+++ Throwable.java      Thu Aug  2 03:47:05 2001
@@ -47,7 +47,8 @@
   static final long serialVersionUID = -3042686055658047285L;
 
   private String message = null;
-
+  private Throwable cause;
+    
   static 
   {
     System.loadLibrary ("runtime");
@@ -66,10 +67,23 @@
    */
   public Throwable(String message) {
     fillInStackTrace();
+    this.cause = null;
     this.message = message;
   }
   
   /**
+   * Instantiate this <code>Throwable</code> with another Throwable.
+   * This is used for chained exceptions.
+   *
+   * @param cause The <code>Throwable<code> to wrap.
+   */
+  public Throwable(Throwable cause)
+  {
+    this.cause = cause;
+    message = cause == null ? null : cause.toString();
+  }
+  
+  /**
    * Get the message associated with this Throwable.
    * @return the error message associated with this Throwable.
    */
@@ -123,6 +137,11 @@
     printStackTrace0 (w);
   }
 
+  public Throwable getCause()
+  {
+    return cause;
+  }
+
   private native void printStackTrace0 (Object stream);
 
   /** 
@@ -156,3 +175,9 @@
       message = (String)oFields.get("detailMessage", (String)null);
     }
 }
+
+/*
+  Local Variables:
+  c-file-style: "gnu"
+  End:
+*/