Originally posted by: SystemAdmin

Hi,

I have been recently using java api of opl to convert the established .mod and .dat file into a solvable .lp file. Yet I found the setting file .ops not involved in the process. Since I might want to revise the settings from the cplex studio view, I really want to find a way to involve it into the opl model too.

I see a line on the reference manual that the task can actually be done using the run configuration. Yet I found the sample is not illustrative enough.

So can someone tell me how to read the .ops file and then build a new opl model and thus a lp file with it?

Many thanks.

Zitong
#DecisionOptimization
#OPLusingCPLEXOptimizer

Hi,

in the factory IloOplFactory, instead of createOplModel you may use createOplProject.

You have an example in \opl\examples\opl_interfaces\java\oplrunsample\src\oplrunsample

IloOplErrorHandler errHandler = oplF.createOplErrorHandler();
        IloOplRunConfiguration rc = null;
        if (_cl.isProject()) {
            IloOplProject prj = oplF.createOplProject(_cl.getProjectPath());
            rc = prj.makeRunConfiguration(_cl.getRunConfigurationName());
        } else {
            if (_cl.getDataFileNames().size() == 0) {
                rc = oplF.createOplRunConfiguration(_cl.getModelFileName());
            } else {
                String[] dataFiles = _cl.getDataFileNames().toArray(
                        new String[_cl.getDataFileNames().size()]);
                rc = oplF.createOplRunConfiguration(_cl.getModelFileName(),
                        dataFiles);
            }
        }

in the configuration, you will have your ops file

regards
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#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

Thanks for your answer.

I already read this sample. But it doesn't involve the process of integrating an already established ops file.

I think your reply suggests that I can have my own newly built ops file through the creation of the project. But this is not what I want.

What I want is to revise the ops file in the cplex studio and then put this revised ops file in my java model.

I hope I have made myself clear.

Thanks again for your help.
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

I think the method ReadProjectSettings is what I want in this case.

I wrote the following code:

IloOplFactory.setDebugMode(true);
IloOplFactory oplF = new IloOplFactory();
IloOplErrorHandler errHandler = oplF.createOplErrorHandler(System.out);

IloOplProject prj = oplF.createOplProject(".\\MILP.mod");

String modpath= ".\\MILP.mod";

String datpath= ".\\input.dat";

IloCplex cplex = oplF.createCplex();
IloCplex.ParameterSet paraset = cplex.getParameterSet();
IloOplSettings settings = oplF.createOplSettings(errHandler);
settings.setWithNames(true);

FileInputStream ifs = new FileInputStream(".\\MIPconfig.ops");

IloOplRunConfiguration rc = oplF.createOplRunConfiguration(modpath,datpath);

prj.ReadProjectSettings(ifs,"OPSFILE",cplex,paraset,settings);

ifs.close();

IloOplModel opl=rc.getOplModel();

opl.generate();

cplex.exportModel(".\\test.lp");
cplex.end();
oplF.end();
I tried to run and got the error saying that there exists mismatches of types between the arguments I gave and that it requires.

Again many thanks.
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: DBRE

Try the following method from IloOplProject:

public  static void ApplyProjectSettings(istream opsStream, String name, IloOplModel model)

#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: DBRE

An example:

    IloOplFactory oplF = new IloOplFactory();
    IloOplErrorHandler errHandler = oplF.createOplErrorHandler();
    IloOplFactory.setDebugMode(true);
    IloOplModelSource modelSource = oplF.createOplModelSource(
        getResourcePath("muModel.mod"), false);
    IloOplModelDefinition def = oplF.createOplModelDefinition(modelSource,
        errHandler);
    IloCplex cplex = oplF.createCplex();
    IloOplModel opl = oplF.createOplModel(def, cplex);

    // Read one setting before changing the setting
    double tilim = cplex.getParam(DoubleParam.TiLim);
    System.out.println("BEFORE ApplyProjectSettings : tilim = " + tilim);

    // Apply the ops file to the OPL model
    String opsPath = "C:/rtc/trunk/opl_lang/examples/tests/data/projectSettings.ops";
    FileInputStream opsStream = new FileInputStream(opsPath);
    JavaToCppInputStreamAdapter streamAdapter = new JavaToCppInputStreamAdapter(
        opsStream);
    String again = "again" + opsPath;
    IloOplProject.ApplyProjectSettings(streamAdapter, again, opl);

    // Re read the setting to see its new value, as set in the ops file
    tilim = cplex.getParam(DoubleParam.TiLim);
    System.out.println("After ApplyProjectSettings : tilim = " + tilim);
    opsStream.close();

    opl.generate();

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#OPLusingCPLEXOptimizer