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Coin / src / engines / SoOutputData.cpp

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/*!
  \class SoEngineOutputData SoOutputData.h Inventor/engines/SoOutputData.h
  \brief The SoEngineOutputData class is a container for a prototype set of outputs.
  \ingroup engines

  This class is instantiated once for each class of objects which use
  outputs, and which needs to be able to import and export them.

  Each output of a class is stored with the name and type it has been
  given within its "owner" class and a pointer offset to the dynamic
  instance of the output itself.

  It is unlikely that application programmers should need to use any
  of the methods of this class directly.
*/

/* IMPORTANT NOTE:
 * If you make any changes (bugfixes, improvements) in this class,
 * remember to also check the SoFieldData class, as this code is heavily
 * based on that class.
 */

#include <Inventor/engines/SoOutputData.h>

#include "coindefs.h" // COIN_STUB()
#include "SbBasicP.h"

#include <Inventor/engines/SoEngine.h>
#include <Inventor/engines/SoNodeEngine.h>
#include <Inventor/engines/SoEngineOutput.h>
#include <Inventor/SbName.h>
#include <Inventor/SoInput.h>
#include <Inventor/SoOutput.h>
#include <Inventor/SoType.h>

#if COIN_DEBUG
#include <Inventor/errors/SoDebugError.h>
#endif // COIN_DEBUG
#include "threads/threadsutilp.h"

#ifndef DOXYGEN_SKIP_THIS // Don't document internal classes.

class SoOutputDataEntry {
public:
  SoOutputDataEntry(const char * n, SoType t, ptrdiff_t offset)
    : name(n), type(t), ptroffset(offset) { }
  SoOutputDataEntry(const SoOutputDataEntry * oe) { this->copy(oe); }
  SoOutputDataEntry(const SoOutputDataEntry & oe) { this->copy(&oe); }

  int operator==(const SoOutputDataEntry * oe) const
  {
    return ((this->name == oe->name) && (this->ptroffset == oe->ptroffset) &&
            (this->type == oe->type));
  }
  int operator!=(const SoOutputDataEntry * oe) const { return ! operator==(oe); }
  int operator==(const SoOutputDataEntry & oe) const { return operator==(&oe); }
  int operator!=(const SoOutputDataEntry & oe) const { return ! operator==(&oe); }

  SbName name;
  SoType type;
  ptrdiff_t ptroffset;

private:
  void copy(const SoOutputDataEntry * oe)
  {
    this->name = oe->name;
    this->type = oe->type;
    this->ptroffset = oe->ptroffset;
  }
};

#endif // DOXYGEN_SKIP_THIS

/*!
  Constructor.
*/
SoEngineOutputData::SoEngineOutputData()
{
}

/*!
  Copy constructor.
*/
SoEngineOutputData::SoEngineOutputData(const SoEngineOutputData *data)
{
  if (data) {
    int n = data->outputlist.getLength();
    for (int i = 0; i < n; i++) {
      this->outputlist.append(new SoOutputDataEntry(data->outputlist[i]));
    }
  }
}

/*!
  Constructor. Supply the approximated number of outputs in the engine
  ot optimize memory allocation.
*/
SoEngineOutputData::SoEngineOutputData(int approxnum)
  : outputlist(approxnum)
{
}

/*!
  Destructor.
*/
SoEngineOutputData::~SoEngineOutputData()
{
  for (int i = 0; i < this->outputlist.getLength(); i++) {
    delete this->outputlist[i];
  }
}

/*!
  Add a new output to our internal list.

  The \a name and \a type will be stored along with a pointer offset
  between \a base and \a output, which will be valid for all instances
  of the class type of \a base.
*/
void
SoEngineOutputData::addOutput(const SoEngine *base, const char *name,
                              const SoEngineOutput *output, SoType type)
{
  CC_GLOBAL_LOCK;
  if (!this->hasOutput(name)) {
    this->addOutputInternal(coin_assert_cast<const SoFieldContainer *>(base), name, output, type);
  }
  CC_GLOBAL_UNLOCK;
}

/*!
  Returns the number of outputs contained within this instance.
*/
int
SoEngineOutputData::getNumOutputs(void) const
{
  return this->outputlist.getLength();
}

/*!
  Returns the name of the output at \a index.
*/
const SbName &
SoEngineOutputData::getOutputName(int index) const
{
  return this->outputlist[index]->name;
}

/*!
  Returns a pointer to the output at \a index within the \a engine
  instance.
*/
SoEngineOutput *
SoEngineOutputData::getOutput(const SoEngine *engine, int index) const
{
  return this->getOutputInternal(coin_assert_cast<const SoFieldContainer*>(engine), index);
}

/*!
  Returns the internal index value of \a output in \a engine. If \a output
  is not part of \a engine, it returns -1.
*/
int
SoEngineOutputData::getIndex(const SoEngine *engine,
                             const SoEngineOutput *output) const
{
  return this->getIndexInternal(coin_assert_cast<const SoFieldContainer*>(engine), output);
}

/*!
  Returns the type of the output at \a index.
*/
const SoType &
SoEngineOutputData::getType(int index) const
{
  return this->outputlist[index]->type;
}

/*!
  FIXME: doc
*/
SbBool
SoEngineOutputData::readDescriptions(SoInput * COIN_UNUSED_ARG(in), SoEngine * COIN_UNUSED_ARG(engine)) const
{
  COIN_STUB();
  return FALSE;
}

/*
  FIXME: doc.
*/
void
SoEngineOutputData::writeDescriptions(SoOutput * COIN_UNUSED_ARG(out),
                                  SoEngine *COIN_UNUSED_ARG(engine)
                                  ) const
{
  COIN_STUB();
}

/*!
  \overload
*/
void
SoEngineOutputData::addOutput(const SoNodeEngine * base, const char *name,
                              const SoEngineOutput * output, SoType type)
{
  CC_GLOBAL_LOCK;
  if (!this->hasOutput(name)) {
    this->addOutputInternal(coin_assert_cast<const SoFieldContainer *>(base), name, output, type);
  }
  CC_GLOBAL_UNLOCK;
}

/*!
  \overload
*/
SoEngineOutput *
SoEngineOutputData::getOutput(const SoNodeEngine * engine, int index) const
{
  return this->getOutputInternal(coin_assert_cast<const SoFieldContainer *>(engine), index);
}

/*!
  \overload
*/
int
SoEngineOutputData::getIndex(const SoNodeEngine * engine, const SoEngineOutput * output) const
{
  return this->getIndexInternal(coin_assert_cast<const SoFieldContainer *>(engine), output);
}

// does the actual job of adding an engine output
void
SoEngineOutputData::addOutputInternal(const SoFieldContainer * base, const char *name,
                                      const SoEngineOutput * output, SoType type)
{
  const ptrdiff_t range =
    reinterpret_cast<const char *>(output) -
    reinterpret_cast<const char *>(base);
  this->outputlist.append(new SoOutputDataEntry(name, type, range));

#if COIN_DEBUG
  // FIXME: this is an ugly design flaw, which doesn't seem easily
  // resolvable while still keeping compatibility. 20000915 mortene.
  if (type.isDerivedFrom(SoType::fromName("SFEnum")) ||
      type.isDerivedFrom(SoType::fromName("MFEnum"))) {
    static SbBool warn = TRUE;
    if (warn) {
      warn = FALSE; // Warn only once.
      SoDebugError::postWarning("SoEngineOutputData::addOutput",
                                "Using as engine output a field which has "
                                "enum type is not advisable, as it contains "
                                "more state than just the value of the field "
                                "(i.e. the name<->value hash mapping must "
                                "also be considered in certain situations). "
                                "This is a design flaw.");
    }
  }
#endif // COIN_DEBUG
}

// does the actual job of returning an engine output
SoEngineOutput *
SoEngineOutputData::getOutputInternal(const SoFieldContainer * base, int index) const
{
  assert(index >= 0 && index < this->outputlist.getLength());
  const char * outputptr = reinterpret_cast<const char *>(base);
  outputptr += this->outputlist[index]->ptroffset;
  return
    const_cast<SoEngineOutput *>
    (
     reinterpret_cast<const SoEngineOutput *>(outputptr)
     );
}

// does the actual job of returning an engine output index
int
SoEngineOutputData::getIndexInternal(const SoFieldContainer * base, const SoEngineOutput * output) const
{
  const ptrdiff_t ptroffset =
    reinterpret_cast<const char *>(output) -
    reinterpret_cast<const char *>(base);

  for (int i = 0; i < this->outputlist.getLength(); i++) {
    if (this->outputlist[i]->ptroffset == ptroffset) return i;
  }
  return -1;
}

/*!
  \internal
  \since Coin 2.3
*/
SbBool
SoEngineOutputData::hasOutput(const char * name) const
{
  for (int i = 0; i < this->outputlist.getLength(); i++) {
    if (this->outputlist[i]->name == name) return TRUE;
  }
  return FALSE;
}