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SPL(Structured Process Language) A programming language specially for structured data computing.
There is a newer version: 20240823
package com.scudata.expression;

import com.scudata.array.ArrayUtil;
import com.scudata.array.BoolArray;
import com.scudata.array.IArray;
import com.scudata.dm.Context;

/**
 * ??ϵ??????࣬???ڶ????ϵ????
 * @author WangXiaoJun
 *
 */
public abstract class Relation extends Operator {
	public static final int EQUAL = 1; // ????
	public static final int GREATER = 2; // ????
	public static final int GREATER_EQUAL = 3; // ???ڵ???
	public static final int LESS  = 4; // С??
	public static final int LESS_EQUAL = 5; // С?ڵ???
	public static final int NOT_EQUAL = 6; // ??????
	public static final int AND = 7; // ?߼???
	public static final int OR = 8; // ?߼???

	// ƥ????????ֵ??Ҫ????
	public static final int UNMATCH = -1; // ȫ??ƥ??
	public static final int PARTICALMATCH = 0; // ????ƥ??
	public static final int ALLMATCH = 1; // ȫƥ??
	
	/**
	 * ????????ֵ??λ?ã?ȡ??ֵ????ֵ?ıȽϹ?ϵ
	 * @param ralation ????Relation?ж???ĳ???
	 * @return ??????Relation?еĳ???
	 */
	public static int getInverseRelation(int ralation) {
		switch(ralation) {
		case GREATER:
			return LESS;
		case GREATER_EQUAL:
			return LESS_EQUAL;
		case LESS:
			return GREATER;
		case LESS_EQUAL:
			return GREATER_EQUAL;
		default:
			return ralation;
		}
	}
	
	/**
	 * ȡ??ֵ????ֵ?ıȽϹ?ϵ
	 * @return ??????Relation?еĳ???
	 */
	public abstract int getRelation();
	
	/**
	 * ????????ֵ??λ?ã?ȡ??ֵ????ֵ?ıȽϹ?ϵ
	 * @return ??????Relation?еĳ???
	 */
	public abstract int getInverseRelation();

	/**
	 * ??????????еĽ??
	 * @param ctx ??????????
	 * @return IArray
	 */
	public IArray calculateAll(Context ctx) {
		IArray leftArray = left.calculateAll(ctx);
		IArray rightArray = right.calculateAll(ctx);
		return leftArray.calcRelation(rightArray, getRelation());
	}

	/**
	 * ????signArray??ȡֵΪsign????
	 * @param ctx
	 * @param signArray ?б?ʶ????
	 * @param sign ??ʶ
	 * @return IArray
	 */
	public IArray calculateAll(Context ctx, IArray signArray, boolean sign) {
		BoolArray result = ArrayUtil.booleanValue(signArray, sign);
		IArray leftArray = left.calculateAll(ctx, result, true);
		IArray rightArray = right.calculateAll(ctx, result, true);
		leftArray.calcRelations(rightArray, getRelation(), result, true);
		return result;
	}

	/**
	 * ?????߼????????&&???Ҳ????ʽ
	 * @param ctx ??????????
	 * @param leftResult &&??????ʽ?ļ?????
	 * @return BoolArray
	 */
	public BoolArray calculateAnd(Context ctx, IArray leftResult) {
		BoolArray result = leftResult.isTrue();
		IArray leftArray = left.calculateAll(ctx, result, true);
		IArray rightArray = right.calculateAll(ctx, result, true);
		leftArray.calcRelations(rightArray, getRelation(), result, true);
		return result;
	}
	
	/**
	 * ?????߼????????||???Ҳ????ʽ
	 * @param ctx ??????????
	 * @param leftResult ||??????ʽ?ļ?????
	 * @return BoolArray
	 */
	public BoolArray calculateOr(Context ctx, IArray leftResult) {
		BoolArray result = leftResult.isTrue();
		IArray leftArray = left.calculateAll(ctx, result, false);
		IArray rightArray = right.calculateAll(ctx, result, false);
		leftArray.calcRelations(rightArray, getRelation(), result, false);
		return result;
	}
}