Module: DataMetaByteSer::VerReads

Includes:
DataMetaDom, DataMetaDom::PojoLexer
Defined in:
lib/dataMetaByteSer/ver_reads.rb

Overview

Migration tooling.

Class Method Summary collapse

Class Method Details

.genVerReadSwitch(v1, v2, modelForVer, vers, outRoot) ⇒ Object

Generates Versioned Read switch that channels the read to the proper migration scenario.

Raises:

  • (ArgumentError) 


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# File 'lib/dataMetaByteSer/ver_reads.rb', line 16

def genVerReadSwitch(v1, v2, modelForVer, vers, outRoot)
#        v1 = mo1.records.values.first.ver.full
#        v2 = mo2.records.values.first.ver.full
    mo1 = modelForVer.call(v1)
    mo2 = modelForVer.call(v2)
    destDir = outRoot
    javaPackage = '' # set the scope for the var
    vars = OpenStruct.new # for template's local variables. ERB does not make them visible to the binding
    # sort the models by versions out, 2nd to be the latest:
    raise ArgumentError, "Versions on the model are the same: #{v1}" if v1 == v2
    if v1 > v2
        model2 = mo1
        model1 = mo2
        ver1 = v2
        ver2 = v1
    else
        model2 = mo2
        model1 = mo1
        ver1 = v1
        ver2 = v2
    end
    puts "Going from ver #{ver1} to #{ver2}"
    trgE = model2.records.values.first
    javaPackage, baseName, packagePath = assertNamespace(trgE.name)
    javaClassName = "Read__Switch_v#{ver1.toVarName}_to_v#{ver2.toVarName}"
    destDir = File.join(outRoot, packagePath)
    FileUtils.mkdir_p destDir
    javaDestFile = File.join(destDir, "#{javaClassName}.java")

    skippedCount = 0
    if File.file?(javaDestFile)
        skippedCount += 1
        $stderr.puts %<Read switch target "#{javaDestFile} present, therefore skipped">
    else
        IO::write(javaDestFile,
                  ERB.new(IO.read(File.join(File.dirname(__FILE__), '../../tmpl/readSwitch.erb')),
                          $SAFE, '%<>').result(binding), mode: 'wb')
    end

    $stderr.puts %<Read Switch targets skipped: #{skippedCount}> if skippedCount > 0
end