/***** 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 Nick Sieger <nicksieger@gmail.com>
*
* 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
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* the terms of any one of the CPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby.libraries;
import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyIO;
import org.jruby.anno.JRubyMethod;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.runtime.load.Library;
import org.jruby.util.io.BadDescriptorException;
import org.jruby.util.io.ChannelDescriptor;
import org.jruby.util.io.OpenFile;
/**
* @author Nick Sieger
*/
public class IOWaitLibrary implements Library {
public void load(Ruby runtime, boolean wrap) {
RubyClass ioClass = runtime.getIO();
ioClass.defineAnnotatedMethods(IOWaitLibrary.class);
}
/**
* returns non-nil if input available without blocking, false if EOF or not open/readable, otherwise nil.
*/
@JRubyMethod(name = "ready?")
public static IRubyObject ready(ThreadContext context, IRubyObject obj) {
RubyIO io = (RubyIO)obj;
try {
OpenFile openFile = io.getOpenFile();
ChannelDescriptor descriptor = openFile.getMainStreamSafe().getDescriptor();
if (!descriptor.isOpen() || !openFile.getMainStreamSafe().getModes().isReadable() || openFile.getMainStreamSafe().feof()) {
return context.getRuntime().getFalse();
}
int avail = openFile.getMainStreamSafe().ready();
if (avail > 0) {
return context.getRuntime().newFixnum(avail);
}
} catch (BadDescriptorException e) {
throw context.runtime.newErrnoEBADFError();
} catch (Exception anyEx) {
return context.getRuntime().getFalse();
}
return context.getRuntime().getNil();
}
/**
* waits until input available or timed out and returns self, or nil when EOF reached.
*/
@JRubyMethod
public static IRubyObject io_wait(ThreadContext context, IRubyObject obj) {
RubyIO io = (RubyIO)obj;
try {
OpenFile openFile = io.getOpenFile();
if (openFile.getMainStreamSafe().feof()) {
return context.getRuntime().getNil();
}
openFile.getMainStreamSafe().waitUntilReady();
} catch (BadDescriptorException e) {
throw context.runtime.newErrnoEBADFError();
} catch (Exception anyEx) {
return context.getRuntime().getNil();
}
return obj;
}
}