From 940b4d1848e8c70ab7642901a68594e8016caffc Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 18:51:28 +0200
Subject: Adding upstream version 1:7.0.4.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../com/sun/star/lib/uno/helper/WeakAdapter.java   | 94 ++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 ridljar/com/sun/star/lib/uno/helper/WeakAdapter.java

(limited to 'ridljar/com/sun/star/lib/uno/helper/WeakAdapter.java')

diff --git a/ridljar/com/sun/star/lib/uno/helper/WeakAdapter.java b/ridljar/com/sun/star/lib/uno/helper/WeakAdapter.java
new file mode 100644
index 000000000..67e01ac32
--- /dev/null
+++ b/ridljar/com/sun/star/lib/uno/helper/WeakAdapter.java
@@ -0,0 +1,94 @@
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
+ */
+
+package com.sun.star.lib.uno.helper;
+import java.lang.ref.WeakReference;
+import com.sun.star.uno.XAdapter;
+import com.sun.star.uno.XReference;
+import java.util.List;
+import java.util.Collections;
+import java.util.LinkedList;
+
+/** An XAdapter implementation that holds a weak reference (java.lang.ref.WeakReference)
+ *  to an object. Clients can register listener (com.sun.star.lang.XReference) which
+ *  are notified when the object (the one which is kept weak) is being finalized. That
+ *  is, that object is being destroyed because there are not any hard references
+ *  to it.
+ */
+public class WeakAdapter implements XAdapter
+{
+    // references the XWeak implementation
+    private final WeakReference<Object> m_weakRef;
+    // contains XReference objects registered by addReference
+    private final List<XReference> m_xreferenceList;
+
+    /**
+     *@param component the object that is to be held weak
+     */
+    public WeakAdapter(Object component)
+    {
+        m_weakRef= new WeakReference<Object>(component);
+        m_xreferenceList= Collections.synchronizedList( new LinkedList<XReference>());
+    }
+
+    /** Called by the XWeak implementation (WeakBase) when it is being finalized.
+     *  It is only being called once.
+     *  The registered XReference listeners are notified. On notification they are
+     *  to unregister themselves. The notification is thread-safe. However, it is possible
+     *  to add a listener during the notification process, which will never receive a
+     *  notification. To prevent this, one would have to synchronize this method with
+     *  the addReference method. But this can result in deadlocks in a multi-threaded
+     *  environment.
+     */
+    void referentDying()
+    {
+        //synchronized call
+        XReference[] references= m_xreferenceList.toArray(new XReference[m_xreferenceList.size()]);
+        for (int i= references.length; i > 0; i--)
+        {
+            references[i-1].dispose();
+        }
+    }
+
+    /** Method  of com.sun.star.uno.XAdapter. It is called to obtain a hard reference
+     *  to the object which is kept weak by this instance.
+     *  @return hard reference to the object
+     */
+    public Object queryAdapted()
+    {
+        return m_weakRef.get();
+    }
+
+    /** Method of com.sun.star.uno.XAdapter. Called by clients to register listener which
+     * are notified when the weak object is dying.
+     *@param xReference a listener
+     */
+    public void removeReference(XReference xReference)
+    {
+        m_xreferenceList.remove(xReference);
+    }
+
+    /** Method of com.sun.star.uno.XAdapter. Called by clients to unregister listeners.
+     *@param xReference listener
+     */
+    public void addReference(XReference xReference)
+    {
+        m_xreferenceList.add(xReference);
+    }
+}
+
-- 
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