/*
* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.lwawt.macosx;
/**
* Safely holds and disposes of native AppKit resources, using the
* correct AppKit threading and Objective-C GC semantics.
*/
public class CFRetainedResource {
private static native void nativeCFRelease(final long ptr, final boolean disposeOnAppKitThread);
final boolean disposeOnAppKitThread;
protected long ptr;
/**
* @param ptr CFRetained native object pointer
* @param disposeOnAppKitThread is the object needs to be CFReleased on the main thread
*/
protected CFRetainedResource(final long ptr, final boolean disposeOnAppKitThread) {
this.disposeOnAppKitThread = disposeOnAppKitThread;
this.ptr = ptr;
}
/**
* CFReleases previous resource and assigns new pre-retained resource.
* @param ptr CFRetained native object pointer
*/
protected void setPtr(final long ptr) {
synchronized (this) {
if (this.ptr != 0) dispose();
this.ptr = ptr;
}
}
/**
* Manually CFReleases the native resource
*/
protected void dispose() {
long oldPtr = 0L;
synchronized (this) {
if (ptr == 0) return;
oldPtr = ptr;
ptr = 0;
}
nativeCFRelease(oldPtr, disposeOnAppKitThread); // perform outside of the synchronized block
}
@Override
protected void finalize() throws Throwable {
dispose();
}
}