observe can take data file

#ifndef INPUTFROMDATAORNOT_H

#define INPUTFROMDATAORNOT_H

#include "Vector.h"

#include "InputNg.h"

#include "Io/IoNg.h"

namespace Dmrg {

template<typename InputCheckType>

class InputFromDataOrNot {

public:

	typedef PsimagLite::InputNg<InputCheckType> InputNgType;

	typedef PsimagLite::IoNg::In IoNgInType;

	InputFromDataOrNot(PsimagLite::String filename, const InputCheckType& inputCheck)

	    : ioWriteable_(0), isData_(false)

	{

		internal(filename);

		ioWriteable_ = (isData_) ? new typename InputNgType::Writeable(inputCheck, data_)

		                         : new typename InputNgType::Writeable(filename, inputCheck);

		//data_ = "";

	}

	~InputFromDataOrNot()

	{

		delete ioWriteable_;

		ioWriteable_ = 0;

	}

	const typename InputNgType::Writeable& ioWriteable() const

	{

		if (ioWriteable_) return *ioWriteable_;

		throw PsimagLite::RuntimeError("InputFromDataOrNot: INTERNAL ERROR (FATAL)\n");

	}

private:

	void internal(PsimagLite::String filename)

	{

		IoNgInType* io = 0;

		try {

			io = new IoNgInType(filename);

			isData_ = true;

		} catch (...) {

			return;

		}

		PsimagLite::String buffer;

		io->read(buffer, "InputBase64Encoded");

		delete io;

		io = 0;

		PsimagLite::PsiBase64::Decode base64decode(buffer);

		data_ = base64decode();

	}

	typename InputNgType::Writeable* ioWriteable_;

	bool isData_;

	PsimagLite::String data_;

};

}

#endif // INPUTFROMDATAORNOT_H