Buf asByteBuffer patch

Buf.asByteBuffer.patch

diff -r cb58d11083c7 src/sys/java/fan/sys/Buf.java
--- a/src/sys/java/fan/sys/Buf.java	Thu Mar 15 14:50:08 2012 +0800
+++ b/src/sys/java/fan/sys/Buf.java	Thu Mar 15 16:59:06 2012 +0800
@@ -11,6 +11,8 @@
 import java.math.*;
 import java.nio.*;
 
+import fanx.interop.Interop;
+
 /**
  * Buf
  */
@@ -233,6 +235,12 @@
     for (int i=0; i<t; ++i) out.write(b);
     return this;
   }
+  
+  /** 
+   * Implements {@link Interop#toJava(Buf)}
+   */
+  public abstract ByteBuffer asByteBuffer();
+  
 
 //////////////////////////////////////////////////////////////////////////
 // OutStream
diff -r cb58d11083c7 src/sys/java/fan/sys/FileBuf.java
--- a/src/sys/java/fan/sys/FileBuf.java	Thu Mar 15 14:50:08 2012 +0800
+++ b/src/sys/java/fan/sys/FileBuf.java	Thu Mar 15 16:59:06 2012 +0800
@@ -251,6 +251,12 @@
       throw IOErr.make(e);
     }
   }
+  
+  @Override
+  public ByteBuffer asByteBuffer()
+  {
+    throw new UnsupportedOperationException();
+  }
 
 //////////////////////////////////////////////////////////////////////////
 // Buf API
diff -r cb58d11083c7 src/sys/java/fan/sys/MemBuf.java
--- a/src/sys/java/fan/sys/MemBuf.java	Thu Mar 15 14:50:08 2012 +0800
+++ b/src/sys/java/fan/sys/MemBuf.java	Thu Mar 15 16:59:06 2012 +0800
@@ -166,6 +166,12 @@
     return len;
   }
 
+  @Override
+  public ByteBuffer asByteBuffer()
+  {
+    return ByteBuffer.wrap(buf, pos, size-pos);
+  }
+  
 //////////////////////////////////////////////////////////////////////////
 // Buf API
 //////////////////////////////////////////////////////////////////////////
diff -r cb58d11083c7 src/sys/java/fan/sys/NioBuf.java
--- a/src/sys/java/fan/sys/NioBuf.java	Thu Mar 15 14:50:08 2012 +0800
+++ b/src/sys/java/fan/sys/NioBuf.java	Thu Mar 15 16:59:06 2012 +0800
@@ -175,6 +175,12 @@
     pipe(src, buf, len);
     return len;
   }
+  
+  @Override
+    public ByteBuffer asByteBuffer()
+    {
+      return buf.duplicate();
+    }
 
 //////////////////////////////////////////////////////////////////////////
 // Buf API
@@ -301,7 +307,7 @@
 // Fields
 //////////////////////////////////////////////////////////////////////////
 
-  private ByteBuffer buf;
+  public ByteBuffer buf;
   private byte[] temp;
 
 }
\ No newline at end of file
diff -r cb58d11083c7 src/sys/java/fanx/interop/Interop.java
--- a/src/sys/java/fanx/interop/Interop.java	Thu Mar 15 14:50:08 2012 +0800
+++ b/src/sys/java/fanx/interop/Interop.java	Thu Mar 15 16:59:06 2012 +0800
@@ -132,6 +132,30 @@
   }
 
   /**
+   * Convert from sys::Buf to to java.nio.ByteBuffer
+   * 
+   * Return a bytebuffer that shares the same storage
+   * as this byte buffer, but independent pos and size.
+   * 
+   * Changes made to the resulting ByteBuffer will affect
+   * this ByteBuffer's content but not its pos or size.
+   * 
+   * The ByteBuffer will be created with position equal
+   * to this buf's pos and limit equal to this buf's limit,
+   * and no mark set.
+   * 
+   * Throws {@link java.lang.UnsupportedOperationException} if this Buf
+   * doesn't use an underlying storage system supported by ByteBuffer.
+   * 
+   * @see java.nio.ByteBuffer#duplicate
+   * @see java.nio.ByteBuffer#wrap(byte[], int, int)
+   */
+  public static java.nio.ByteBuffer toJava(Buf buf)
+  {
+    return buf.asByteBuffer();
+  }
+  
+  /**
    * Convert from sys::InStream to java.io.InputStream.
    */
   public static InputStream toJava(InStream in)