io.virtdata.core.CompatibilityFixups Maven / Gradle / Ivy

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Statistical sampling library for use in virtualdataset libraries, based on apache commons math 4
There is a newer version: 2.12.15
package io.virtdata.core;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class CompatibilityFixups {

    private final static Logger logger = LoggerFactory.getLogger(CompatibilityFixups.class);

    // Not all of these are simple upper-case changes
    private final static Map funcs = new HashMap() {{
        put("log_normal","LogNormal");
        put("normal", "Normal");
        put("levy", "Levy");
        put("nakagami","Nakagami");
        put("exponential","Exponential");
        put("logistic","Logistic");
        put("laplace","Laplace");
        put("cauchy","Cauchy");
        put("f","F");
        put("t","T");
        put("weibull","Weibull");
        put("chi_squared","ChiSquared");
        put("gumbel","Gumbel");
        put("beta","Beta");
        put("pareto","Pareto");
        put("gamma","Gamma");
        put("uniform_real","Uniform");
        put("uniform_integer","Uniform");
        put("hypergeometric","Hypergeometric");
        put("geometric","Geometric");
        put("poisson","Poisson");
        put("zipf","Zipf");
        put("binomial","Binomial");
        put("pascal","Pascal");
    }};
    private static final String MAPTO = "mapto_";
    private static final String HASHTO = "hashto_";
    private static final String COMPUTE = "compute_";
    private static final String INTERPOLATE = "interpolate_";

    private final static Pattern oldcurve = Pattern.compile("(?\\b[\\w_]+)(?\\()(?.*?)(?\\))");

    private final static CompatibilityFixups instance = new CompatibilityFixups();

    public static String fixup(String spec) {
        String fixed = instance.fix(spec);
        if (!fixed.equals(spec)) {
            logger.warn(spec + "' was preprocessed to '" + fixed + "'. Please change to the new one to avoid this warning.");
        }
        return fixed;
    }

    public String fix(String spec) {

        // Fixup curve ctors. These are not HOF, so local matching will work fine. However, they could occur multiple
        // times within an HOF, so multiple replace is necessary.
        Matcher matcher = oldcurve.matcher(spec);
        StringBuilder out = new StringBuilder(spec.length());
        int start = 0;

        while (matcher.find()) {
            out.append(spec.substring(start, matcher.start()));
            String replacement = fixCurveCall(matcher.group("name"), matcher.group("args"));
            out.append(replacement);
            start = matcher.end();
        }
        out.append(spec.substring(start));

        return out.toString();
    }

    private String fixCurveCall(String name, String args) {
        boolean map = false;
        boolean compute = false;
        if (name.contains(MAPTO)) {
            name = name.replaceAll(MAPTO,"");
            map=true;
        }
        if (name.contains(HASHTO)) {
            name = name.replaceAll(HASHTO,"");
            map=false;
        }
        if (name.contains(COMPUTE)) {
            name = name.replaceAll(COMPUTE,"");
            compute=true;
        }
        if (name.contains(INTERPOLATE)) {
            name = name.replaceAll(INTERPOLATE,"");
            compute=false;
        }

        String nameReplacement = funcs.get(name);
        if (nameReplacement!=null) {
            name=nameReplacement;
            args=map?args+",'map'":args+",'hash'";
            args=compute?args+",'compute'":args+",'interpolate'";
        }
        return name+"("+args+")";

    }
}