jruby/src/org/jruby/util/IOChannel.java at parallel_boot · MSNexploder/jruby · GitHub

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/***** BEGIN LICENSE BLOCK *****

* Version: EPL 1.0/GPL 2.0/LGPL 2.1

* The contents of this file are subject to the Eclipse 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/epl-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.

* 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 EPL, 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 EPL, the GPL or the LGPL.

***** END LICENSE BLOCK *****/

package org.jruby.util;

import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.channels.Channel;

import java.nio.channels.ReadableByteChannel;

import java.nio.channels.WritableByteChannel;

import org.jruby.RubyString;

import org.jruby.runtime.CallSite;

import org.jruby.runtime.builtin.IRubyObject;

import org.jruby.runtime.MethodIndex;

/**

* 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 <a href="mailto:Ola.Bini@ki.se">Ola Bini</a>

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.

* @param io the ruby object

protected IOChannel(final IRubyObject io) {

this.io = io;

}

public void close() throws IOException {

if (io.respondsTo("close")) closeAdapter.call(io.getRuntime().getCurrentContext(), io, io);

}

public boolean isOpen() {

throw new UnsupportedOperationException("Not supported yet.");

}

protected int read(CallSite read, ByteBuffer dst) throws IOException {

IRubyObject readValue = read.call(io.getRuntime().getCurrentContext(), io, io, io.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 write, ByteBuffer src) throws IOException {

ByteList buffer = new ByteList(src.array(), src.position(), src.remaining(), false);

IRubyObject written = write.call(io.getRuntime().getCurrentContext(), io, io, RubyString.newStringLight(io.getRuntime(), buffer));

return (int)written.convertToInteger().getLongValue();

}

protected CallSite initReadSite() {

if(io.respondsTo("read")) {

return MethodIndex.getFunctionalCallSite("read");

} else {

throw new IllegalArgumentException(io.getMetaClass() + "not coercible to " + getClass().getSimpleName() + ": no `read' method");

}

protected CallSite initWriteSite() {

if(io.respondsTo("write")) {

return MethodIndex.getFunctionalCallSite("write");

} else if (io.respondsTo("<<")) {

return MethodIndex.getFunctionalCallSite("<<");

} else {

throw new IllegalArgumentException(io.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);

read = initReadSite();

}

public int read(ByteBuffer dst) throws IOException {

return read(read, dst);

}

public static class IOWritableByteChannel extends IOChannel implements WritableByteChannel {

private final CallSite write;

public IOWritableByteChannel(final IRubyObject io) {

super(io);

write = initWriteSite();

}

public int write(ByteBuffer src) throws IOException {

return write(write, src);

}

public static class IOReadableWritableByteChannel extends IOChannel implements ReadableByteChannel, WritableByteChannel {

private final CallSite write;

private final CallSite read;

public IOReadableWritableByteChannel(final IRubyObject io) {

super(io);

read = initReadSite();

write = initWriteSite();

}

public int read(ByteBuffer dst) throws IOException {

return read(read, dst);

}

public int write(ByteBuffer src) throws IOException {

return write(write, src);

}

jruby/src/org/jruby/util/IOChannel.java at parallel_boot · MSNexploder/jruby · GitHub

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