public override IJavaPeerable PeekPeer(JniObjectReference reference)
{
if (!reference.IsValid)
{
return(null);
}
var hash = JNIEnv.IdentityHash(reference.Handle);
lock (instances) {
IdentityHashTargets targets;
if (instances.TryGetValue(hash, out targets))
{
for (int i = targets.Count - 1; i >= 0; i--)
{
var wref = targets [i];
if (!wref.TryGetTarget(out var result) || !result.PeerReference.IsValid)
{
targets.RemoveAt(i);
continue;
}
if (!JniEnvironment.Types.IsSameObject(reference, result.PeerReference))
{
continue;
}
return(result);
}
}
}
return(null);
}
internal void AddPeer(IJavaPeerable value, IntPtr handle, JniHandleOwnership transfer, out IntPtr handleField)
{
if (handle == IntPtr.Zero)
{
handleField = handle;
return;
}
var transferType = transfer & (JniHandleOwnership.DoNotTransfer | JniHandleOwnership.TransferLocalRef | JniHandleOwnership.TransferGlobalRef);
switch (transferType)
{
case JniHandleOwnership.DoNotTransfer:
handleField = JNIEnv.NewGlobalRef(handle);
break;
case JniHandleOwnership.TransferLocalRef:
handleField = JNIEnv.NewGlobalRef(handle);
JNIEnv.DeleteLocalRef(handle);
break;
case JniHandleOwnership.TransferGlobalRef:
handleField = handle;
break;
default:
throw new ArgumentOutOfRangeException("transfer", transfer,
"Invalid `transfer` value: " + transfer + " on type " + value.GetType());
}
if (handleField == IntPtr.Zero)
{
throw new InvalidOperationException("Unable to allocate Global Reference for object '" + value.ToString() + "'!");
}
IntPtr hash = JNIEnv.IdentityHash(handleField);
value.SetJniIdentityHashCode((int)hash);
if ((transfer & JniHandleOwnership.DoNotRegister) == 0)
{
AddPeer(value, new JniObjectReference(handleField, JniObjectReferenceType.Global), hash);
}
if (Logger.LogGlobalRef)
{
JNIEnv._monodroid_gref_log("handle 0x" + handleField.ToString("x") +
"; key_handle 0x" + hash.ToString("x") +
": Java Type: `" + JNIEnv.GetClassNameFromInstance(handleField) + "`; " +
"MCW type: `" + value.GetType().FullName + "`\n");
}
}
public override void RemovePeer(IJavaPeerable value)
{
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
if (!value.PeerReference.IsValid)
{
throw new ArgumentException("Must have a valid JNI object reference!", nameof(value));
}
var reference = value.PeerReference;
var hash = JNIEnv.IdentityHash(reference.Handle);
RemovePeer(value, hash);
}
