AbstractFileComparison.hpp

/*

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*/

#ifndef ABSTRACTFILECOMPARISON_HPP_
#define ABSTRACTFILECOMPARISON_HPP_

#include <string>
#include "FileFinder.hpp"
#include "OutputFileHandler.hpp"
#include "PetscTools.hpp"

class AbstractFileComparison
{
public:

    AbstractFileComparison(const FileFinder& rFileFinder1,
                           const FileFinder& rFileFinder2,
                           bool calledCollectively,
                           bool suppressOutput):
        mFilename1(rFileFinder1.GetAbsolutePath()),
        mFilename2(rFileFinder2.GetAbsolutePath()),
        mCalledCollectively(calledCollectively),
        mSuppressOutput(suppressOutput)
    {
        Setup();
    }

    AbstractFileComparison(std::string fileName1,
                           std::string fileName2,
                           bool calledCollectively,
                           bool suppressOutput):
        mFilename1(fileName1),
        mFilename2(fileName2),
        mCalledCollectively(calledCollectively),
        mSuppressOutput(suppressOutput)
    {
        Setup();
    }

    virtual ~AbstractFileComparison()
    {
        if (mpFile1)
        {
            mpFile1->close();
            delete mpFile1;
        }
        if (mpFile2)
        {
            mpFile2->close();
            delete mpFile2;
        }
    }

protected:

    std::string mFilename1; 
    std::string mFilename2; 
    std::ifstream* mpFile1; 
    std::ifstream* mpFile2; 
    unsigned mLineNum; 
    bool mCalledCollectively; 
    bool mSuppressOutput;

    void ResetFiles()
    {
        if (!mCalledCollectively || PetscTools::AmMaster())
        {
            // We want to reset the files to allow this method to be called again, with different tolerances for instance.
            mpFile1->close();
            mpFile2->close();
            mpFile1->open(mFilename1.c_str());
            mpFile2->open(mFilename2.c_str());
            mLineNum = 1u;
        }
    }

    void SkipHeaderLines(unsigned numLinesToSkip)
    {
        if (!mCalledCollectively || PetscTools::AmMaster())
        {
            for (unsigned line_number=0; line_number<numLinesToSkip; line_number++)
            {
                char buffer[1024];
                mpFile1->getline(buffer, 1024);
                mpFile2->getline(buffer, 1024);
                TS_ASSERT(!mpFile1->fail()); // Here we assume there are at least "ignoreFirstFewLines" lines...
                TS_ASSERT(!mpFile2->fail()); // ...and that they are lines of no more than 1024 characters
                mLineNum++;
            }
        }
    }

private:
    void Setup()
    {
        if (mCalledCollectively)
        {
            PetscTools::Barrier("AbstractFileComparison::Setup");
        }
        if (!mCalledCollectively || PetscTools::AmMaster())
        {
            mpFile1 = new std::ifstream(mFilename1.c_str());

            // If it doesn't exist - throw exception
            if (!mpFile1->is_open())
            {
                delete mpFile1;
                mpFile1 = NULL;
                EXCEPTION("Couldn't open file: " + mFilename1);
            }

            mpFile2 = new std::ifstream(mFilename2.c_str());

            // If it doesn't exist - throw exception
            if (!mpFile2->is_open())
            {
                mpFile1->close();
                delete mpFile1;
                mpFile1 = NULL;
                delete mpFile2;
                mpFile2 = NULL;
                EXCEPTION("Couldn't open file: " + mFilename2);
            }

            mLineNum = 1u;
        }
        else
        {
            mpFile1 = NULL;
            mpFile2 = NULL;
        }
    }
};

#endif // ABSTRACTFILECOMPARISON_HPP_