com.github.dakusui.lisj.pred.Comp Maven / Gradle / Ivy

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package com.github.dakusui.lisj.pred;

import static com.github.dakusui.lisj.Basic.get;

import com.github.dakusui.jcunit.core.Utils;
import com.github.dakusui.lisj.Context;
import com.github.dakusui.lisj.FormResult;

public abstract class Comp extends BinomialPredicate {
	/**
	 * Serial version UID.
	 */
	private static final long serialVersionUID = 234943933153946011L;

	@Override
	protected Object checkParams(Object params) {
		super.checkParams(params);
		Utils.checknull(get(params, 0));
		Utils.checknull(get(params, 1));
		return params;
	}

	@Override
	protected FormResult evaluateLast(Context context, Object[] evaluatedParams, FormResult lastResult) {
		FormResult ret = lastResult;
		
		Object value = evaluatedParams[0];
		Object another = evaluatedParams[1];
		
		if (value == null || !(value instanceof Comparable)) throw new IllegalArgumentException(msgIllegalArgumentFound(value, evaluatedParams));
		if (another == null || !(another instanceof Comparable)) throw new IllegalArgumentException(msgIllegalArgumentFound(another, evaluatedParams));
		
		ret.value(evaluate(value, another));
		return ret;
	}

	protected abstract boolean evaluate(Object value, Object another);
	
	@SuppressWarnings("unchecked")
	protected int compare(
			@SuppressWarnings("rawtypes") Comparable a, 
			@SuppressWarnings("rawtypes") Comparable b
			) {
		return a.compareTo(b);
	}
}