/src/FreeImage/Source/OpenEXR/IlmImf/ImfAttribute.cpp

  1///////////////////////////////////////////////////////////////////////////
  2//
  3// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
  4// Digital Ltd. LLC
  5// 
  6// All rights reserved.
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 14// copyright notice, this list of conditions and the following disclaimer
 15// in the documentation and/or other materials provided with the
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 33///////////////////////////////////////////////////////////////////////////
 34
 35
 36
 37//-----------------------------------------------------------------------------
 38//
 39//	class Attribute
 40//
 41//-----------------------------------------------------------------------------
 42
 43#include <ImfAttribute.h>
 44#include "IlmThreadMutex.h"
 45#include "Iex.h"
 46#include <string.h>
 47#include <map>
 48
 49
 50namespace Imf {
 51
 52using IlmThread::Mutex;
 53using IlmThread::Lock;
 54
 55
 56Attribute::Attribute () {}
 57
 58
 59Attribute::~Attribute () {}
 60
 61
 62namespace {
 63
 64struct NameCompare: std::binary_function <const char *, const char *, bool>
 65{
 66    bool
 67    operator () (const char *x, const char *y) const
 68    {
 69	return strcmp (x, y) < 0;
 70    }
 71};
 72
 73
 74typedef Attribute* (*Constructor)();
 75typedef std::map <const char *, Constructor, NameCompare> TypeMap;
 76
 77
 78class LockedTypeMap: public TypeMap
 79{
 80  public:
 81
 82    Mutex mutex;
 83};
 84
 85
 86LockedTypeMap &
 87typeMap ()
 88{
 89    static Mutex criticalSection;
 90    Lock lock (criticalSection);
 91
 92    static LockedTypeMap* typeMap = 0;
 93
 94    if (typeMap == 0)
 95	typeMap = new LockedTypeMap ();
 96
 97    return *typeMap;
 98}
 99
100
101} // namespace
102
103
104bool		
105Attribute::knownType (const char typeName[])
106{
107    LockedTypeMap& tMap = typeMap();
108    Lock lock (tMap.mutex);
109
110    return tMap.find (typeName) != tMap.end();
111}
112
113
114void	
115Attribute::registerAttributeType (const char typeName[],
116			          Attribute *(*newAttribute)())
117{
118    LockedTypeMap& tMap = typeMap();
119    Lock lock (tMap.mutex);
120
121    if (tMap.find (typeName) != tMap.end())
122	THROW (Iex::ArgExc, "Cannot register image file attribute "
123			    "type \"" << typeName << "\". "
124			    "The type has already been registered.");
125
126    tMap.insert (TypeMap::value_type (typeName, newAttribute));
127}
128
129
130void
131Attribute::unRegisterAttributeType (const char typeName[])
132{
133    LockedTypeMap& tMap = typeMap();
134    Lock lock (tMap.mutex);
135
136    tMap.erase (typeName);
137}
138
139
140Attribute *
141Attribute::newAttribute (const char typeName[])
142{
143    LockedTypeMap& tMap = typeMap();
144    Lock lock (tMap.mutex);
145
146    TypeMap::const_iterator i = tMap.find (typeName);
147
148    if (i == tMap.end())
149	THROW (Iex::ArgExc, "Cannot create image file attribute of "
150			    "unknown type \"" << typeName << "\".");
151
152    return (i->second)();
153}
154
155
156} // namespace Imf