UT/UT_Error.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      ramin
 *      Side Effects
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *
 * NAME:        UT_Error.h (Utility Library, C++)
 *
 * COMMENTS:
 *              This class is used to store an error or warning, it is
 *              used in conjunction with a global UT_ErrorManager.
 *
 */

#ifndef __UT_Error__
#define __UT_Error__

#include "UT_API.h"
#include "UT_String.h"
class UT_Color;

enum UT_ErrorSeverity
{
    UT_ERROR_NONE = 0,
    UT_ERROR_MESSAGE,   // just for communication (eg "ignoring point normals")
    UT_ERROR_PROMPT,    // something that should catch the user's attention
    UT_ERROR_WARNING,   // something bad happened but continuing is an option
    UT_ERROR_ABORT,     // bad error which meant discontinuing current action
    UT_ERROR_FATAL,     // something bad from which we can't recover
    UT_NUM_ERROR_SEVERITIES
};

// NOTE:
// UT_ERROR_JUST_STRING is meant for convenience for times when you need
// to list things, or to use more than one string in an error. eg:
//      Error: Missing token "{"
//        ref: Animated Parameter Load

enum UT_CommonErrorCode
{
    UT_ERROR_FILE_NOT_FOUND = 0,
    UT_ERROR_EOF,
    UT_ERROR_PARSING,
    UT_ERROR_FILE_FORMAT,
    UT_ERROR_OUTSTREAM,         // output to stream failed in %s.
    UT_ERROR_INSTREAM,          // input from stream failed in %s.
    UT_ERROR_EARLY_STREAM_END,  // unexpected end of input stream is %s.
    UT_ERROR_SKIP_PACKET_CLASS, // ignoring unrecog data packet (class) in %s.
    UT_ERROR_SKIP_PACKET_ID,    // ignoring unrecog data packet (id) in %s.
    UT_ERROR_SKIP_TOKEN,        // ignoring unrecog token "%s".
    UT_ERROR_BAD_TOKEN,         // unrecog token "%s". Unable to continue
    UT_ERROR_MISSING_TOKEN,     // missing token "%s".
    UT_ERROR_BAD_INT,           // Invalid integer specification (%s)
    UT_ERROR_BAD_FLOAT,         // Invalid float specification (%s)
    UT_ERROR_JUST_STRING,       // %s           -- see note above
    UT_ERROR_BAD_EXTENSION,     // Unknown file extension (%s)
    UT_ERROR_BAD_CPIO_HEADER,   // Bad header in CPIO packet
    UT_ERROR_BAD_CPIO_CONTENTS, // Bad contents in CPIO packet
    UT_ERROR_CANT_MKDIR_FILE_EXISTS,    // Can't make directory, file exists
    UT_ERROR_FILE_NOT_WRITEABLE,        // Unable to write to file (%s)
    UT_ERROR_ABORT_BY_USER,     // Action aborted by user: %s
    UT_ERROR_LOW_VIDEO_RAM,     // Houdini is running low on graphics VRAM
    UT_ERROR_DEADLOCK           // Deadlock
};


#define UT_CE_EARLY_INPUT_END   UT_ERROR_EOF
#define UT_CE_PARSE_ERROR       UT_ERROR_PARSING
#define UT_CE_FILE_ERROR        UT_ERROR_FILE_FORMAT


class UT_API UT_Error
{
public:

//  NOTE: A copy of string is stored. String is just an optional
//  message associated with the error (eg a file name).
//  "type" is usually a library prefix or it can be either "System"
//  or "Common".
//
    UT_Error(const char *type, const int errorcode, const char *string = 0,
             const UT_ErrorSeverity = UT_ERROR_ABORT);
    
    virtual             ~UT_Error();

    // If you're stringing several errors together, you should set
    // last to the severity of the last error for which you got the
    // error message, so that if the severity hasn't changed, we won't
    // print the "Error/Warning/Message" headers before the message.
    //
    // if the use headers flag is off, then the headers (nor spaces in
    // their place) will be prepended to the message
    virtual void         getErrorMessage(UT_String &error,
                                 const UT_ErrorSeverity last = UT_ERROR_NONE,
                                 int useheaders = 1);

    const UT_String     &getErrorType() const   { return myErrorType; }
    UT_ErrorSeverity     getSeverity()  const   { return mySeverity; }
    int                  getErrorCode() const   { return myErrorCode; }
    const UT_String     &getString()    const   { return myErrorString; }

    void                 setErrorType(const char *type);
    void                 setErrorString(const char *string);
    void                 setErrorCode(int code);
 
//
//  getFileString will open the file specified in the filename parameter
//  and search for the entry with the given errorcode. The entry is
//  placed in the buffer.
//
//  The format of the file is:
//  # comments
//  <errorcode><single character (non digit)><error message>
//
//  in other words, an error code (string of digits)
//  a character (typically a tab)
//  and a newline terminated string
//  eg:
//  145 Generic Error Message.
//
//  Note: You might have a %s in the message somewhere. And also,
//  only the first nondigit is ignored. All other chars until
//  the newline, are significant.
//  Also, all lines with the same code are appended to each other.
//
//  If the error is not found, 0 is returned.
//
//  Note: These files are cached after reading, you have to restart
//  Houdini to get them to clear out (or write a clearErrorCache method)
//
    static int  getFileString(UT_String &buffer, const char *errorfile,
                    const int errorcode, UT_ErrorSeverity severity,
                    const UT_ErrorSeverity last, int useheaders);
       void              setSeverity(UT_ErrorSeverity);

protected:

//  Since most errors follow the same pattern, they can use this
//  method to generate an error string.
//  errorfile may be an absolute or relative pathname.
//  (relative to /ufs/prisms/support/error)
//  The error will be sprintf(buffer, errorformat, str);
//  errorformat is taken out of error file, and str is the
//  string in the constructor. "last" contains the severity of
//  the last error on which this method was called if we're
//  stringing a bunch of errors together. If this error has
//  the same severity as the last one, then we don't prepend
//  the message with the Error/Warning/Message header.
//  Furthermore, if the useheaders flag is zero, then the 
//  header (and/or filler spaces) are omitted altogether.
//
    void         stdGetErrorMessage(UT_String &errorstring,
                                    const char *errorfile,
                                    const UT_ErrorSeverity last,
                                    int useheaders) const;

private:
    UT_String            myErrorType;
    UT_String            myErrorString;
    UT_ErrorSeverity     mySeverity;
    int                  myErrorCode;
};

#endif

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