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/***** BEGIN LICENSE BLOCK *****
* Version: EPL 2.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Eclipse Public
* License Version 2.0 (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-v20.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 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.OutputStream;
import java.io.IOException;
import org.jcodings.Encoding;
import org.jcodings.specific.ASCIIEncoding;
import org.jruby.Ruby;
import org.jruby.RubyIO;
import org.jruby.RubyString;
import org.jruby.runtime.CallSite;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.runtime.MethodIndex;
import static org.jruby.api.Create.newSharedString;
/**
* 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 class IOOutputStream extends OutputStream {
private final IRubyObject io;
private final RubyIO realIO;
private final Ruby runtime;
private final CallSite writeAdapter;
private final CallSite closeAdapter = MethodIndex.getFunctionalCallSite("close");
private final Encoding encoding;
/**
* Creates a new OutputStream with the object provided.
*
* @param io the ruby object
*/
public IOOutputStream(final IRubyObject io, Encoding encoding, boolean checkAppend, boolean verifyCanWrite) {
this.io = io;
this.runtime = io.getRuntime();
// If we can get a real IO from the object, we can do fast writes
RubyIO realIO = this.realIO = getRealIO(io);
if (realIO == null || verifyCanWrite) {
final String site;
if (io.respondsTo("write")) {
site = "write";
} else if (checkAppend && io.respondsTo("<<")) {
site = "<<";
} else if (verifyCanWrite) {
throw io.getRuntime().newArgumentError("Object: " + io + " is not a legal argument to this wrapper, " +
"cause it doesn't respond to \"write\".");
} else {
site = "write";
}
writeAdapter = MethodIndex.getFunctionalCallSite(site);
}
else {
writeAdapter = null; // won't be used
}
this.encoding = encoding;
}
protected RubyIO getRealIO(IRubyObject io) {
RubyIO realIO = null;
if (io instanceof RubyIO) {
RubyIO tmpIO = (RubyIO) io;
if (fastWritable(tmpIO)) {
tmpIO = tmpIO.GetWriteIO();
// recheck write IO for IOness
if (tmpIO == io || fastWritable(tmpIO)) {
realIO = tmpIO;
}
}
}
return realIO;
}
protected boolean fastWritable(RubyIO io) {
return !io.isClosed() &&
io.isBuiltin("write");
}
public IOOutputStream(final IRubyObject io, boolean checkAppend, boolean verifyCanWrite) {
this(io, ASCIIEncoding.INSTANCE, checkAppend, verifyCanWrite);
}
/**
* Creates a new OutputStream with the object provided.
*
* @param io the ruby object
*/
public IOOutputStream(final IRubyObject io) {
this(io, true, true);
}
public IOOutputStream(final IRubyObject io, Encoding encoding) {
this(io, encoding, true, true);
}
@Override
public void write(final int bite) throws IOException {
ThreadContext context = runtime.getCurrentContext();
RubyIO realIO = this.realIO;
if (realIO != null) {
realIO.write(context, bite);
} else {
IRubyObject io = this.io;
writeAdapter.call(context, io, io, newSharedString(context, new ByteList(new byte[]{(byte) bite}, encoding, false)));
}
}
@Override
public void write(final byte[] b) throws IOException {
write(b, 0, b.length);
}
@Override
public void write(final byte[] b,final int off, final int len) throws IOException {
ThreadContext context = runtime.getCurrentContext();
RubyIO realIO = this.realIO;
if (realIO != null) {
realIO.write(context, b, off, len, encoding);
} else {
IRubyObject io = this.io;
writeAdapter.call(context, io, io, RubyString.newStringLight(runtime, new ByteList(b, off, len, encoding, false)));
}
}
@Override
public void close() throws IOException {
ThreadContext context = runtime.getCurrentContext();
RubyIO realIO = this.realIO;
if (realIO != null) {
realIO.close(context);
} else {
IRubyObject io = this.io;
if (io.respondsTo("close")) {
closeAdapter.call(context, io, io);
}
}
}
}