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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.javasupport.util.RuntimeHelpers;
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(frame = true, visibility = PRIVATE)
public IRubyObject initialize(ThreadContext context, IRubyObject obj) {
ref = new WeakReference<IRubyObject>(obj);
return RuntimeHelpers.invokeSuper(context, this, obj, Block.NULL_BLOCK);
}
@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;
}
}