CH_ChannelRef.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.
 *
 * NAME:        CH_ChannelRef.h ( CH Library, C++)
 *
 * COMMENTS:
 */

#ifndef __CH_ChannelRef__
#define __CH_ChannelRef__

#include "CH_API.h"
#include "CH_Types.h"
#include <UT/UT_Map.h>
#include <UT/UT_String.h>

#include <functional>
#include <iosfwd>

class UT_StringArray;

class CH_API CH_ChannelRef
{
public:

    CH_ChannelRef(const CH_ChannelRef &other)
    {
        // this is a bit faster than calling through setChannelRef,
        // since we avoid the allocString
        UT_ASSERT( other.myName );
        myNodeId = other.myNodeId;
        myIsTrack = other.myIsTrack;
        myName = other.myName;
    }

    CH_ChannelRef( int node_id, const char *name, bool is_track )
    {
        setChannelRef(node_id, name, is_track);
    }

    CH_ChannelRef()
    {
        clear();
    }

    ~CH_ChannelRef()
    {
        // do nothing for now -- maybe later free strings?
    }

    void         setChannelRef(int node_id, const char *name, bool is_track);

    void         clear();

    int          getNodeId() const { return myNodeId; }

    void         setNodeId( int new_id ) { myNodeId = new_id; }

    const char  *getName() const   { return myName; }

    bool         isTrack() const   { return myIsTrack; }

    bool         operator==( const CH_ChannelRef &other ) const
    {
        return myNodeId == other.myNodeId &&
               myIsTrack == other.myIsTrack &&
               myName == other.myName;
    }

    CH_ChannelRef &operator=( const CH_ChannelRef &other )
    {
        setChannelRef(other.myNodeId, other.myName, 
                      other.myIsTrack);
        return *this;
    }

    bool          operator<(const CH_ChannelRef &other) const
                  {
                      if (myNodeId < other.myNodeId)
                          return true;
                      // FIXME, we should sort by path, not by id
                      if (myNodeId == other.myNodeId &&
                              isLess(myName, other.myName))
                          return true;
                      return false;
                  }

    bool          operator>(const CH_ChannelRef &other) const
                  {
                      if (myNodeId > other.myNodeId)
                          return true;
                      // FIXME, we should sort by path, not by id
                      if (myNodeId == other.myNodeId &&
                              isGreater(myName, other.myName))
                          return true;
                      return false;
                  }

    int           compare(const CH_ChannelRef& other) const
                  {
                      if (*this < other)
                          return -1;
                      if (*this > other)
                          return 1;
                      return 0;
                  }

    unsigned int        hash() const;

private:
    bool         isLess(const char *str1, const char *str2) const
                 {
                     bool       rval;
                     if( !str1 )
                     {
                         if( str2 ) rval = true;// Yes, null ptr is < str2
                         else rval = false;
                     }
                     else
                     {
                         if( !str2) rval = false;// Nope, null is < str2
                         else rval = (strcmp(str1, str2) < 0) ? true : false;
                     }
                     return rval;
                 }
    bool         isGreater(const char *str1, const char *str2) const
                 {
                     bool       rval;
                     if( !str1 ) rval = false;
                     else
                     {
                         if( !str2 ) rval = true;// Yes, str1 is > null
                         else rval = (strcmp(str1, str2) > 0) ? true : false;
                     }
                     return rval;
                 }

    int          myNodeId:30;
    unsigned     myIsTrack:1;
    const char  *myName;
};


inline size_t hash_value(const CH_ChannelRef &ref)
{
    return ref.hash();
}

/// CH_ChannelRefTable maintains a set of CH_ChannelRef's along with some
/// flags that are from CH_ScopeMasks (see CH_Types.h)
typedef UT_Map<CH_ChannelRef, unsigned> CH_ChannelRefTable;

typedef std::function<bool(const CH_ChannelRef&, unsigned flags)>
        CH_ChannelRefQueryCallback;
typedef std::function<void(const CH_ChannelRef&)>
        CH_ChannelRefCallback;

/// Deletes all the symbols from the table that have the given node_id,
/// returns the number of items deleted
CH_API extern int
CHdeleteRefsWithNodeId(
        CH_ChannelRefTable &ref_table,
        int node_id,
        CH_ChannelRefQueryCallback should_delete_callback = nullptr,
        CH_ChannelRefCallback pre_delete_callback = nullptr);

CH_API extern void
CHaddFullChannelPath(
        const CH_ChannelRefTable &table,
        UT_StringArray &chan_paths,
        bool use_alias);

CH_API extern void
CHaddExposedChannel(
        const CH_ChannelRefTable &table,
        CH_ChannelList &channels);

CH_API extern void
CHaddExposedChanRef(
        const CH_ChannelRefTable &table,
        CH_ChannelRefList &chanrefs,
        unsigned mask); // mask = 0 means no filtering

CH_API extern int
CHcompareChanRefs(const CH_ChannelRef*, const CH_ChannelRef*);

CH_API extern bool
CHchannelsToChanRefs(const CH_ChannelList &channels, CH_ChannelRefList &refs);

CH_API extern bool
CHchanRefsToChannels(const CH_ChannelRefList &refs, CH_ChannelList &channels);

CH_API extern void
CHdisplayChanRefs(const CH_ChannelRefList &refs);

CH_API extern std::ostream &
operator<<(std::ostream &os, const CH_ChannelRef &ref);

#endif