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/**
* Classes that wrap the Imagemagick exception handling.
*
* Copyright: Mike Wey 2011
* License: To be determined
* Authors: Mike Wey
*/
module dmagick.Exception;
import std.conv;
import dmagick.c.client;
import dmagick.c.exception;
/**
* A base class for all exceptions thrown bij DMagick.
* The following Exceptions are derived from this class:
*
* ResourceLimitException, TypeException, OptionException,
* DelegateException, MissingDelegateException, CorruptImageException,
* FileOpenException, BlobException, StreamException, CacheException,
* CoderException, FilterException, ModuleException, DrawException,
* ImageException, WandException, RandomException, XServerException,
* MonitorException, RegistryException, ConfigureException, PolicyException
*/
class DMagickException : Exception
{
this(string reason, string description)
{
string message = to!(string)(GetClientName());
if ( reason.length > 0 )
message ~= ": " ~ reason;
if ( description.length > 0 )
message ~= " (" ~ description ~ ")";
super(message);
}
private enum string[] severities = [ "Blob", "Cache", "Coder",
"Configure", "CorruptImage", "Delegate", "Draw", "FileOpen",
"Filter", "Image", "MissingDelegate", "Module", "Monitor",
"Option", "Policy", "Random", "Registry", "ResourceLimit",
"Stream", "Type", "Wand", "XServer" ];
/**
* Throws an Exception or error matching the ExceptionInfo.
*/
static void throwException(ExceptionInfo* exception)
{
if ( exception.severity == ExceptionType.UndefinedException )
return;
string reason = to!(string)(exception.reason);
string description = to!(string)(exception.description);
mixin(
{
string exceptions =
"switch ( exception.severity )
{";
foreach ( severity; severities )
{
exceptions ~=
"case ExceptionType."~ severity ~"Warning:
throw new "~ severity ~"Exception(reason, description);
break;
case ExceptionType."~ severity ~"Error:
case ExceptionType."~ severity ~"FatalError:
throw new "~ severity ~"Error(reason, description);
break;";
}
return exceptions ~= "}";
}());
}
}
/**
* A base class for all errors thrown bij DMagick.
* The following Errors are derived from this class:
*
* ResourceLimitError, TypeError, OptionError,
* DelegateError, MissingDelegateError, CorruptImageError,
* FileOpenError, BlobError, StreamError, CacheError,
* CoderError, FilterError, ModuleError, DrawError,
* ImageError, WandError, RandomError, XServerError,
* MonitorError, RegistryError, ConfigureError, PolicyError
*/
class DMagickError : Error
{
this(string reason, string description)
{
string message = to!(string)(GetClientName());
if ( reason.length > 0 )
message ~= ": " ~ reason;
if ( description.length > 0 )
message ~= " (" ~ description ~ ")";
super(message);
}
}
/**
* Generate the exceptions and the throwException function;
*/
mixin(
{
string exceptions;
foreach ( severity; DMagickException.severities )
{
exceptions ~=
"class " ~ severity ~ "Exception : DMagickException
{
this(string reason, string description)
{
super(reason, description);
}
}";
exceptions ~=
"class " ~ severity ~ "Error : DMagickError
{
this(string reason, string description)
{
super(reason, description);
}
}";
}
return exceptions;
}());
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