Remove asReadOnlyBuffer method from Buffer interface

Author: silvanocerza

src/main/java/com/maxmind/db/Buffer.java

@@ -114,11 +114,4 @@ interface Buffer {
      * @throws CharacterCodingException if decoding fails
      */
     String decode(CharsetDecoder decoder) throws CharacterCodingException;
-
-    /**
-     * Creates a read-only view of this buffer.
-     *
-     * @return a read-only buffer
-     */
-    Buffer asReadOnlyBuffer();
 }

src/main/java/com/maxmind/db/BufferHolder.java

@@ -24,7 +24,7 @@ final class BufferHolder {
                         + database.getName()
                         + " into memory. Unexpected end of stream.");
                 }
-                this.buffer = buf.asReadOnlyBuffer();
+                this.buffer = buf;
             } else {
                 this.buffer = SingleBuffer.mapFromChannel(channel);
             }
@@ -48,7 +48,7 @@ final class BufferHolder {
         while (-1 != (br = stream.read(bytes))) {
             baos.write(bytes, 0, br);
         }
-        this.buffer = SingleBuffer.wrap(baos.toByteArray()).asReadOnlyBuffer();
+        this.buffer = SingleBuffer.wrap(baos.toByteArray());
     }
 
     /*

src/main/java/com/maxmind/db/SingleBuffer.java

@@ -124,12 +124,6 @@ public String decode(CharsetDecoder decoder)
         return decoder.decode(buffer).toString();
     }
 
-    /** {@inheritDoc} */
-    @Override
-    public SingleBuffer asReadOnlyBuffer() {
-        return new SingleBuffer(buffer.asReadOnlyBuffer());
-    }
-
     /**
      * Wraps the given byte array in a new {@code SingleBuffer}.
      *