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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) 2006 Ola Bini <Ola.Bini@ki.se> 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 InputStream. 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 reading, and the only requirement on the io-object is that it responds to read() like IO.
 
 public class IOInputStream extends InputStream {
     private final IRubyObject io;
     private final InputStream in;
     private final IRubyObject numOne;
     private static final CallSite readAdapter = MethodIndex.getFunctionalCallSite("read");
     private static final CallSite closeAdapter = MethodIndex.getFunctionalCallSite("close");

    
Creates a new InputStream with the object provided.

Parameters:
io the ruby object
 
     public IOInputStream(IRubyObject io) {
         if (!io.respondsTo("read")) {
             throw new IllegalArgumentException("Object: " + io + " is not a legal argument to this wrapper, cause it doesn't respond to \"read\".");
         }
         this. = io;
         this. = ((io instanceof RubyIO) && !((RubyIO)io).isClosed() && ((RubyIO)io).isBuiltin("read"))
                 ? ((RubyIO)io).getInStream() : null;
         this. = RubyFixnum.one(this..getRuntime());
     }
 
     @Override
     public void close() throws IOException {
         if ( != null) {
             .close();
         } else if (.respondsTo("close")) {
             .call(.getRuntime().getCurrentContext(), );
         }
     }
 
     // Note: this method produces meaningful results
     // only for RubyIO objects. For everything else returns 0.
     @Override
     public int available() throws IOException {
         if ( != null) {
             return .available();
         } else {
             return 0;
         }
     }
     
     public int read() throws IOException {
         if ( != null) {
             return .read();
         }
         IRubyObject readValue = .call(.getRuntime().getCurrentContext(), );
         int returnValue = -1;
         if (!readValue.isNil()) {
             returnValue = readValue.convertToString().getByteList().get(0);
         }
        return returnValue;
    }
    @Override
    public int read(byte[] bthrows IOException {
        if ( != null) {
            return .read(b, 0, b.length);
        }
        IRubyObject readValue = .call(.getRuntime().getCurrentContext(), .getRuntime().newFixnum(b.length));
        int returnValue = -1;
        if (!readValue.isNil()) {
            ByteList str = readValue.convertToString().getByteList();
            System.arraycopy(str.getUnsafeBytes(), str.getBegin(), b, 0, str.getRealSize());
            returnValue = str.getRealSize();
        }
        return returnValue;
    }
    @Override
    public int read(byte[] bint offint lenthrows IOException {
        if ( != null) {
            return .read(bofflen);
        }
        IRubyObject readValue = .call(.getRuntime().getCurrentContext(), .getRuntime().newFixnum(len));
        int returnValue = -1;
        if (!readValue.isNil()) {
            ByteList str = readValue.convertToString().getByteList();
            System.arraycopy(str.getUnsafeBytes(), str.getBegin(), boffstr.getRealSize());
            returnValue = str.getRealSize();
        }
        return returnValue;
     }
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