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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.api.composers;

import io.virtdata.api.FunctionType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.function.*;

public class FunctionAssembly implements FunctionComposer {
    private final static Logger logger = LoggerFactory.getLogger(FunctionAssembly.class);

    private FunctionComposer composer = null;

    @Override
    public Object getFunctionObject() {
        if (composer != null) {
            return composer.getFunctionObject();
        } else {
            throw new RuntimeException("No function have been passed for assembly.");
        }
    }

    @Override
    public FunctionComposer andThen(Object outer) {
        try {
            if (composer != null) {
                composer = composer.andThen(outer);
            } else {
                composer = andThenInitial(outer);
            }
            return composer;
        } catch (Exception e) {
            logger.error("Error while composing functions:\n");
            if (composer != null) {
                logger.error("composer: class:" + composer.getClass().getSimpleName() + ", toString:" + composer.toString());
            }
            logger.error("outer: class:" + outer.getClass() + ", toString:" + outer.toString());
            throw e;
        }
    }

    private FunctionComposer andThenInitial(Object o) {
        try {
            FunctionType functionType = FunctionType.valueOf(o);
            switch (functionType) {
                case long_long:
                    return new ComposerForLongUnaryOperator((LongUnaryOperator) o);
                case long_int:
                    return new ComposerForLongToIntFunction((LongToIntFunction) o);
                case long_double:
                    return new ComposerForLongToDoubleFunction((LongToDoubleFunction) o);
                case long_T:
                    return new ComposerForLongFunction((LongFunction) o);
                case int_int:
                    return new ComposerForIntUnaryOperator((IntUnaryOperator) o);
                case int_long:
                    return new ComposerForIntToLongFunction((IntToLongFunction) o);
                case int_double:
                    return new ComposerForIntToDoubleFunction((IntToDoubleFunction) o);
                case int_T:
                    return new ComposerForIntFunction((IntFunction) o);
                case double_double:
                    return new ComposerForDoubleUnaryOperator((DoubleUnaryOperator) o);
                case double_long:
                    return new ComposerForDoubleToLongFunction((DoubleToLongFunction) o);
                case double_int:
                    return new ComposerForDoubleToIntFunction((DoubleToIntFunction) o);
                case double_T:
                    return new ComposerForDoubleFunction((DoubleFunction) o);
                case R_T:
                    return new ComposerForFunction((Function) o);
                default:
                    throw new RuntimeException("Unrecognized function type:" + functionType);
            }
        } catch (Exception e) {
            logger.error("Error while setting up initial composer state for function class:" +
            o.getClass().getSimpleName() + ", toString:" + o.toString());
            throw e;
        }
    }

    @Override
    public String toString() {
        return "composer:" + this.composer;
    }
}