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BEGIN LICENSE BLOCK ***** Version: CPL 1.0/GPL 2.0/LGPL 2.1 The contents of this file are subject to the Common Public License Version 1.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.eclipse.org/legal/cpl-v10.html Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. Copyright (C) 2009 Sun Microsystems, Inc Alternatively, the contents of this file may be used under the terms of either of the GNU General Public License Version 2 or later (the "GPL"), or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which case the provisions of the GPL or the LGPL are applicable instead of those above. If you wish to allow use of your version of this file only under the terms of either the GPL or the LGPL, and not to allow others to use your version of this file under the terms of the CPL, indicate your decision by deleting the provisions above and replace them with the notice and other provisions required by the GPL or the LGPL. If you do not delete the provisions above, a recipient may use your version of this file under the terms of any one of the CPL, the GPL or the LGPL. END LICENSE BLOCK ***
 
 package org.jruby.util;
 
This class wraps a IRubyObject in an OutputStream. Depending on which messages the IRubyObject answers to, it will have different functionality. The point is that the IRubyObject could exhibit duck typing, in the style of IO versus StringIO, for example. At the moment, the only functionality supported is writing, and the only requirement on the io-object is that it responds to write() and close() like IO.

Author(s):
Ola Bini
 
 public abstract class IOChannel implements Channel {
     private final IRubyObject io;
     private final CallSite closeAdapter = MethodIndex.getFunctionalCallSite("close");

    
Creates a new OutputStream with the object provided.

Parameters:
io the ruby object
 
     protected IOChannel(final IRubyObject io) {
         this. = io;
     }
     
     public void close() throws IOException {
         if (.respondsTo("close")) .call(.getRuntime().getCurrentContext(), );
     }
 
     public boolean isOpen() {
         throw new UnsupportedOperationException("Not supported yet.");
     }
 
     protected int read(CallSite readByteBuffer dstthrows IOException {
         IRubyObject readValue = read.call(.getRuntime().getCurrentContext(), .getRuntime().newFixnum(dst.remaining()));
         int returnValue = -1;
         if (!readValue.isNil()) {
             ByteList str = ((RubyString)readValue).getByteList();
             dst.put(str.getUnsafeBytes(), str.getBegin(), str.getRealSize());
             returnValue = str.getRealSize();
         }
         return returnValue;
     }
 
     protected int write(CallSite writeByteBuffer srcthrows IOException {
         ByteList buffer = new ByteList(src.array(), src.position(), src.remaining(), false);
         IRubyObject written = write.call(.getRuntime().getCurrentContext(), , RubyString.newStringLight(.getRuntime(), buffer));
         return (int)written.convertToInteger().getLongValue();
     }
 
     protected CallSite initReadSite() {
         if(.respondsTo("read")) {
             return MethodIndex.getFunctionalCallSite("read");
         } else {
             throw new IllegalArgumentException(.getMetaClass() + "not coercible to " + getClass().getSimpleName() + ": no `read' method");
         }
     }
 
     protected CallSite initWriteSite() {
         if(.respondsTo("write")) {
             return MethodIndex.getFunctionalCallSite("write");
        } else if (.respondsTo("<<")) {
            return MethodIndex.getFunctionalCallSite("<<");
        } else {
            throw new IllegalArgumentException(.getMetaClass() + "not coercible to " + getClass().getSimpleName() + ": no `write' method");
        }
    }
    
    public static class IOReadableByteChannel extends IOChannel implements ReadableByteChannel {
        private final CallSite read;
        public IOReadableByteChannel(final IRubyObject io) {
            super(io);
             = initReadSite();
        }
        
        public int read(ByteBuffer dstthrows IOException {
            return read(dst);
        }
    }
    public static class IOWritableByteChannel extends IOChannel implements WritableByteChannel {
        private final CallSite write;
        public IOWritableByteChannel(final IRubyObject io) {
            super(io);
             = initWriteSite();
        }
        public int write(ByteBuffer srcthrows IOException {
            return write(src);
        }
    }
    public static class IOReadableWritableByteChannel extends IOChannel implements ReadableByteChannelWritableByteChannel {
        private final CallSite write;
        private final CallSite read;
        public IOReadableWritableByteChannel(final IRubyObject io) {
            super(io);
             = initReadSite();
             = initWriteSite();
        }
        public int read(ByteBuffer dstthrows IOException {
            return read(dst);
        }
        public int write(ByteBuffer srcthrows IOException {
            return write(src);
        }
    }
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