lphy.base.function.Concat2Str Maven / Gradle / Ivy

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The standard library of LPhy, which contains the required generative distributions and basic functions.

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package lphy.base.function;

import lphy.core.model.DeterministicFunction;
import lphy.core.model.Value;
import lphy.core.model.annotation.GeneratorInfo;
import lphy.core.model.annotation.ParameterInfo;

import java.util.Objects;

public class Concat2Str extends DeterministicFunction {

    public static final String firstParamName = "prefix";
    public static final String secondParamName = "suffix";

    public Concat2Str(@ParameterInfo(name = firstParamName, description ="the prefix substring to concatenate.")
                  Value substr1,
                      @ParameterInfo(name = secondParamName, description ="the suffix substring to concatenate.")
                  Value substr2) {

        setParam(firstParamName, substr1);
        setParam(secondParamName, substr2);
    }

    @Override
    @GeneratorInfo(name = "concat2Str", description = "A function to concatenate substrings into one sting.")
    public Value apply() {
        Value substr1 = getParams().get(firstParamName);
        Value substr2 = getParams().get(secondParamName);

        return join(substr1,substr2);
    }

    // concatenate Value[] into Value
    private Value join(Value... substr) {
        StringBuilder oneStr = new StringBuilder();
        for (Value s : substr)
            oneStr.append(Objects.requireNonNull(s).value());
        return new Value(oneStr.toString(), this);
    }
}