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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);
}
}
}