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cs440-acg/ext/openexr/OpenEXR/IlmImf/ImfAttribute.cpp

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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
+// Digital Ltd. LLC
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+// *       Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// *       Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// *       Neither the name of Industrial Light & Magic nor the names of
+// its contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission. 
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+///////////////////////////////////////////////////////////////////////////
+
+
+
+//-----------------------------------------------------------------------------
+//
+//	class Attribute
+//
+//-----------------------------------------------------------------------------
+
+#include <ImfAttribute.h>
+#include "IlmThreadMutex.h"
+#include "Iex.h"
+#include <string.h>
+#include <map>
+
+#include "ImfNamespace.h"
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER 
+
+
+using ILMTHREAD_NAMESPACE::Mutex;
+using ILMTHREAD_NAMESPACE::Lock;
+
+
+Attribute::Attribute () {}
+
+
+Attribute::~Attribute () {}
+
+
+namespace {
+
+struct NameCompare: std::binary_function <const char *, const char *, bool>
+{
+    bool
+    operator () (const char *x, const char *y) const
+    {
+	return strcmp (x, y) < 0;
+    }
+};
+
+
+typedef Attribute* (*Constructor)();
+typedef std::map <const char *, Constructor, NameCompare> TypeMap;
+
+
+class LockedTypeMap: public TypeMap
+{
+  public:
+
+    Mutex mutex;
+};
+
+
+LockedTypeMap &
+typeMap ()
+{
+    static Mutex criticalSection;
+    Lock lock (criticalSection);
+
+    static LockedTypeMap* typeMap = 0;
+
+    if (typeMap == 0)
+	typeMap = new LockedTypeMap ();
+
+    return *typeMap;
+}
+
+
+} // namespace
+
+
+bool		
+Attribute::knownType (const char typeName[])
+{
+    LockedTypeMap& tMap = typeMap();
+    Lock lock (tMap.mutex);
+
+    return tMap.find (typeName) != tMap.end();
+}
+
+
+void	
+Attribute::registerAttributeType (const char typeName[],
+			          Attribute *(*newAttribute)())
+{
+    LockedTypeMap& tMap = typeMap();
+    Lock lock (tMap.mutex);
+
+    if (tMap.find (typeName) != tMap.end())
+	THROW (IEX_NAMESPACE::ArgExc, "Cannot register image file attribute "
+			    "type \"" << typeName << "\". "
+			    "The type has already been registered.");
+
+    tMap.insert (TypeMap::value_type (typeName, newAttribute));
+}
+
+
+void
+Attribute::unRegisterAttributeType (const char typeName[])
+{
+    LockedTypeMap& tMap = typeMap();
+    Lock lock (tMap.mutex);
+
+    tMap.erase (typeName);
+}
+
+
+Attribute *
+Attribute::newAttribute (const char typeName[])
+{
+    LockedTypeMap& tMap = typeMap();
+    Lock lock (tMap.mutex);
+
+    TypeMap::const_iterator i = tMap.find (typeName);
+
+    if (i == tMap.end())
+	THROW (IEX_NAMESPACE::ArgExc, "Cannot create image file attribute of "
+			    "unknown type \"" << typeName << "\".");
+
+    return (i->second)();
+}
+
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT