Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 185 insertions, 0 deletions

diff --git a/cli_ure/source/ure/uno/util/WeakComponentBase.cs b/cli_ure/source/ure/uno/util/WeakComponentBase.cs
new file mode 100644
index 000000000..48715afc6
--- /dev/null
+++ b/cli_ure/source/ure/uno/util/WeakComponentBase.cs
@@ -0,0 +1,185 @@
+/*
+ * 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 .
+ */
+
+using System;
+using unoidl.com.sun.star.lang;
+
+namespace uno.util
+{
+
+/** This class can be used as a base class for UNO objects.
+    It implements the capability to be kept weakly
+    (unoidl.com.sun.star.uno.XWeak) and it implements
+    unoidl.com.sun.star.lang.XTypeProvider which is necessary for
+    using the object from StarBasic.
+    In addition, it implements the interface
+    unoidl.com.sun.star.lang.XComponent to be disposed explicitly.
+*/
+public class WeakComponentBase : WeakBase, XComponent
+{
+    private delegate void t_disposing( EventObject evt );
+    private t_disposing m_disposing = null;
+    private bool m_inDispose = false;
+    private bool m_disposed = false;
+
+    /** Indicates whether object is already disposed.
+
+        @return
+                true, if object has been disposed
+    */
+    protected bool isDisposed()
+    {
+        lock (this)
+        {
+            return m_disposed;
+        }
+    }
+
+    /** Checks whether this object is disposed and throws a DisposedException
+        if it is already disposed.
+    */
+    protected void checkUnDisposed()
+    {
+        if (! isDisposed())
+        {
+            throw new unoidl.com.sun.star.lang.DisposedException(
+                "object already disposed!", this );
+        }
+    }
+    
+    ~WeakComponentBase()
+    {
+        bool doDispose;
+        lock (this)
+        {
+            doDispose = (!m_inDispose && !m_disposed);
+        }
+        if (doDispose)
+        {
+            dispose();
+        }
+    }
+    
+    /** Override to perform extra clean-up work. Provided for subclasses.
+        It is called during dispose()
+    */
+    protected void preDisposing()
+    {
+    }
+    
+    /** Override to become notified right before the disposing action is
+        performed.
+    */
+    protected void postDisposing()
+    {
+    }
+    
+    // XComponent impl
+    /** This method is called by the owner of this object to explicitly
+        dispose it.  This implementation of dispose() first notifies this object
+        via preDisposing(), then  all registered event listeners and
+        finally this object again calling postDisposing().
+    */
+    public void dispose()
+    {
+        // Determine in a thread-safe way if this is the first call to this
+        // method.  Only then we proceed with the notification of event
+        // listeners.  It is an error to call this method more than once.
+        bool doDispose = false;
+        t_disposing call = null;
+        lock (this)
+        {
+            if (! m_inDispose && !m_disposed)
+            {
+                call = m_disposing;
+                m_disposing = null;
+                m_inDispose = true;
+                doDispose = true;
+            }
+        }
+        // The notification occurs in an unsynchronized block in order to avoid
+        // deadlocks if one of the listeners calls back in a different thread on
+        // a synchronized method which uses the same object.
+        if (doDispose)
+        {
+            try
+            {
+                // call sub class
+                preDisposing();
+                // send disposing notifications to listeners
+                if (null != call)
+                {
+                    EventObject evt = new EventObject( this );
+                    call( evt );
+                }
+                // call sub class
+                postDisposing();
+            }
+            finally
+            {
+                // finally makes sure that the flags are set ensuring
+                // that this function is only called once.
+                m_disposed = true;
+                m_inDispose = false;
+            }
+        }
+        else
+        {
+            // in a multithreaded environment, it can't be avoided,
+            // that dispose is called twice.
+            // However this condition is traced, because it MAY indicate an
+            // error.
+#if DEBUG
+            Console.WriteLine(
+                "WeakComponentBase.dispose() - dispose called twice" );
+#endif
+//             Debug.Fail( "WeakComponentBase.dispose() - dispose called twice" );
+        }
+    }
+    /** Registers an event listener being notified when this object is disposed.
+
+        @param xListener event listener
+    */
+    public void addEventListener( XEventListener xListener )
+    {
+        bool add;
+        lock (this)
+        {
+            add = (! m_inDispose && !m_disposed);
+            if (add)
+                m_disposing += new t_disposing( xListener.disposing );
+        }
+        if (! add)
+            xListener.disposing( new EventObject( this ) );
+    }
+    /** Revokes an event listener from being notified when this object
+        is disposed.
+        
+        @param xListener event listener
+    */
+    public void removeEventListener( XEventListener xListener )
+    {
+        lock (this)
+        {
+            if (! m_inDispose && !m_disposed)
+                m_disposing -= new t_disposing( xListener.disposing );
+        }
+    }
+}
+
+}