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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
//osgIntrospection - Copyright (C) 2005 Marco Jez
#ifndef OSGINTROSPECTION_READERWRITER_
#define OSGINTROSPECTION_READERWRITER_
#include <osgIntrospection/Value>
#include <osgIntrospection/Type>
#include <osgIntrospection/Exceptions>
#include <osgIntrospection/variant_cast>
#include <osg/Vec2>
#include <osg/Vec3>
#include <osg/Vec4>
#include <osg/ref_ptr>
#include <iostream>
#include <sstream>
namespace osgIntrospection
{
/// This is the base class for reader/writer objects. A ReaderWriter's
/// purpose is to provide the means for writing the content of a Value
/// object to a stream and for reading it back. Descendants can either
/// be specialized for just one data type or they can handle several
/// types, that's up to the implementor. A derived class is not required
/// to support all streaming operations (text write, text read, bin write
/// and bin read), it can implement just some of them, although full
/// support is strongly encouraged.
class ReaderWriter
{
public:
class Options
{
public:
Options(): fno_(false) {}
virtual ~Options() {}
bool getForceNumericOutput() const { return fno_; }
void setForceNumericOutput(bool fno) { fno_ = fno; }
private:
bool fno_;
};
/// Writes a textual representation of the value's content to a stream.
virtual std::ostream &writeTextValue(std::ostream &, const Value& v, const Options* = 0) const { throw StreamingNotSupportedException(StreamingNotSupportedException::TEXT_WRITE, v.getType().getExtendedTypeInfo()); }
/// Reads a textual representation of the value's content from a stream.
virtual std::istream &readTextValue(std::istream &, Value& v, const Options* = 0) const { throw StreamingNotSupportedException(StreamingNotSupportedException::TEXT_READ, v.getType().getExtendedTypeInfo()); }
/// Writes a textual representation of the value's content to a stream.
virtual std::wostream &writeTextValue(std::wostream & wos, const Value& v, const Options* op = 0) const { std::ostringstream os; writeTextValue(os, v, op); wos << os; return (wos);}
/// Reads a textual representation of the value's content from a stream.
virtual std::wistream &readTextValue(std::wistream& , Value& v, const Options* = 0) const { throw StreamingNotSupportedException(StreamingNotSupportedException::TEXT_READ, v.getType().getExtendedTypeInfo()); }
/// Writes a binary representation of the value's content to a stream.
virtual std::ostream &writeBinaryValue(std::ostream &, const Value& v, const Options* = 0) const { throw StreamingNotSupportedException(StreamingNotSupportedException::BINARY_WRITE, v.getType().getExtendedTypeInfo()); }
/// Reads a binary representation of the value's content from a stream.
virtual std::istream &readBinaryValue(std::istream &, Value& v, const Options* = 0) const { throw StreamingNotSupportedException(StreamingNotSupportedException::BINARY_READ, v.getType().getExtendedTypeInfo()); }
/// Virtual destructor.
virtual ~ReaderWriter() {}
};
/// This class template provides basic default streaming capabilities
/// for all types that define streaming operators (<< and >>). Most of
/// the standard types are able to be read and written this way, so the
/// StdReaderWriter template can be a convenient default for several
/// types. The binary representation is a raw copy of the memory content.
///
/// TO-DO: improve binary streaming and avoid arch dependency.
///
template<typename T>
class StdReaderWriter: public ReaderWriter
{
public:
virtual std::ostream &writeTextValue(std::ostream &os, const Value& v, const Options * = 0) const
{
return (os << variant_cast<T>(v));
}
virtual std::istream &readTextValue(std::istream &is, Value& v, const Options * = 0) const
{
if (v.isEmpty()) v = Value(T());
return (is >> variant_cast<T &>(v));
}
virtual std::ostream &writeBinaryValue(std::ostream &os, const Value& v, const Options * = 0) const
{
return os.write(reinterpret_cast<const char *>(extract_raw_data<T>(v)), sizeof(T));
}
virtual std::istream &readBinaryValue(std::istream &is, Value& v, const Options * = 0) const
{
if (v.isEmpty()) v = Value(T());
return is.read(reinterpret_cast<char *>(extract_raw_data<T>(v)), sizeof(T));
}
};
template<typename T>
class StdWReaderWriter: public ReaderWriter
{
public:
virtual std::wostream &writeTextValue(std::wostream &wos, const Value& v, const Options * = 0) const
{
return (wos << variant_cast<T>(v));
}
virtual std::wistream &readTextValue(std::wistream &wis, Value& v, const Options * = 0) const
{
if (v.isEmpty()) v = Value(T());
return (wis >> variant_cast<T &>(v));
}
virtual std::ostream &writeBinaryValue(std::ostream &os, const Value& v, const Options * = 0) const
{
return os.write(reinterpret_cast<const char *>(extract_raw_data<T>(v)), sizeof(T));
}
virtual std::istream &readBinaryValue(std::istream &is, Value& v, const Options * = 0) const
{
if (v.isEmpty()) v = Value(T());
return is.read(reinterpret_cast<char *>(extract_raw_data<T>(v)), sizeof(T));
}
};
/// This ReaderWriter can be used to read and write enumeration values.
/// The textual representation will be the enum label, if found, or the
/// numerical value. The binary representation doesn't take label names
/// into account.
template<typename T>
class EnumReaderWriter: public ReaderWriter
{
virtual std::ostream &writeTextValue(std::ostream &os, const Value& v, const Options *options = 0) const
{
int numeric = static_cast<int>(variant_cast<T>(v));
if (!options || !options->getForceNumericOutput())
{
const Type& type = v.getType();
const EnumLabelMap& elm = type.getEnumLabels();
EnumLabelMap::const_iterator i = elm.find(numeric);
if (i != elm.end())
{
os << i->second;
return os;
}
else
{
std::vector<std::string> labels;
// it could be a bitmask
for (EnumLabelMap::const_iterator i=elm.begin(); i!=elm.end(); ++i)
{
if (i->first != 0 && ((i->first & numeric) == i->first))
{
numeric ^= i->first;
labels.push_back(i->second);
}
}
// check whether all bits were discovered
if (numeric == 0)
{
for (std::vector<std::string>::const_iterator i=labels.begin(); i!=labels.end(); ++i)
{
os << *i;
if ((i+1) != labels.end()) os << " | ";
}
return os;
}
}
}
return os << numeric;
}
virtual std::istream &readTextValue(std::istream &is, Value& v, const Options * = 0) const
{
if (v.isEmpty()) v = Value(T());
int i;
if (is >> i)
{
variant_cast<T &>(v) = static_cast<T>(i);
return is;
}
is.clear();
std::string s;
if (is >> s)
{
const Type& type = v.getType();
const EnumLabelMap& elm = type.getEnumLabels();
for (EnumLabelMap::const_iterator i=elm.begin(); i!=elm.end(); ++i)
{
if (i->second.compare(s) == 0)
{
variant_cast<T &>(v) = static_cast<T>(i->first);
return is;
}
}
}
return is;
}
virtual std::ostream &writeBinaryValue(std::ostream &os, const Value& v, const Options * = 0) const
{
return os.write(reinterpret_cast<const char *>(extract_raw_data<T>(v)), sizeof(T));
}
virtual std::istream &readBinaryValue(std::istream &is, Value& v, const Options * = 0) const
{
if (v.isEmpty())
v = Value(T());
return is.read(reinterpret_cast<char *>(extract_raw_data<T>(v)), sizeof(T));
}
};
/// This is a ReaderWriter class that can be used to read and write
/// pointer values. Note: template parameter T must be a pointer!
template<typename T>
class PtrReaderWriter: public ReaderWriter
{
public:
virtual std::ostream &writeTextValue(std::ostream &os, const Value& v, const Options* = 0) const
{
return (os << (void*)variant_cast<T>(v));
}
virtual std::istream &readTextValue(std::istream &is, Value& v, const Options* = 0) const
{
void *ptr;
is >> ptr;
v = Value(T(ptr));
return is;
}
virtual std::ostream &writeBinaryValue(std::ostream &os, const Value& v, const Options* = 0) const
{
return os.write(reinterpret_cast<const char *>(extract_raw_data<T>(v)), sizeof(T));
}
virtual std::istream &readBinaryValue(std::istream &is, Value& v, const Options* = 0) const
{
T ptr;
is.read(reinterpret_cast<char *>(&ptr), sizeof(T));
v = Value(ptr);
return is;
}
};
}
#endif
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