jruby/core/src/main/java/org/jruby/util/IOOutputStream.java at master · jruby/jruby · GitHub

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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.

* 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);

}

jruby/core/src/main/java/org/jruby/util/IOOutputStream.java at master · jruby/jruby · GitHub

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jruby/core/src/main/java/org/jruby/util/IOOutputStream.java at master · jruby/jruby · GitHub

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