/***** 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.ext.weakref;
import java.lang.ref.WeakReference;
import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyException;
import org.jruby.RubyObject;
import org.jruby.anno.JRubyMethod;
import org.jruby.anno.JRubyClass;
import org.jruby.exceptions.RaiseException;
import org.jruby.runtime.Helpers;
import org.jruby.runtime.Block;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import static org.jruby.runtime.Visibility.*;
import org.jruby.runtime.builtin.IRubyObject;
/**
*
* @author headius
*/
@JRubyClass(name="WeakRef", parent="Delegator")
public class WeakRef extends RubyObject {
private WeakReference<IRubyObject> ref;
public static final ObjectAllocator WEAKREF_ALLOCATOR = new ObjectAllocator() {
public IRubyObject allocate(Ruby runtime, RubyClass klazz) {
return new WeakRef(runtime, klazz);
}
};
@JRubyClass(name="WeakRef::RefError", parent="StandardError")
public static class RefError {}
public WeakRef(Ruby runtime, RubyClass klazz) {
super(runtime, klazz);
}
@JRubyMethod(name = "__getobj__")
public IRubyObject getobj() {
IRubyObject obj = ref.get();
if (obj == null) {
// FIXME weakref.rb also does caller(2) here for the backtrace
throw newRefError("Illegal Reference - probably recycled");
}
return obj;
}
@JRubyMethod(name = "__setobj__")
public IRubyObject setobj(IRubyObject obj) {
return getRuntime().getNil();
}
@JRubyMethod(name = "new", required = 1, meta = true)
public static IRubyObject newInstance(IRubyObject clazz, IRubyObject arg) {
WeakRef weakRef = (WeakRef)((RubyClass)clazz).allocate();
weakRef.callInit(new IRubyObject[] {arg}, Block.NULL_BLOCK);
return weakRef;
}
// framed for invokeSuper
@JRubyMethod(visibility = PRIVATE)
public IRubyObject initialize(ThreadContext context, IRubyObject obj) {
ref = new WeakReference<IRubyObject>(obj);
return context.nil;
}
@JRubyMethod(name = "weakref_alive?")
public IRubyObject weakref_alive_p() {
return ref.get() != null ? getRuntime().getTrue() : getRuntime().getFalse();
}
private RaiseException newRefError(String message) {
Ruby runtime = getRuntime();
ThreadContext context = runtime.getCurrentContext();
RubyException exception =
(RubyException)runtime.getClass("WeakRef").getClass("RefError").newInstance(context,
new IRubyObject[] {runtime.newString(message)}, Block.NULL_BLOCK);
RaiseException re = new RaiseException(exception);
return re;
}
}