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SPL(Structured Process Language) A programming language specially for structured data computing.
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package com.scudata.expression.operator;

import com.scudata.array.BoolArray;
import com.scudata.array.IArray;
import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.expression.Relation;
import com.scudata.resources.EngineMessage;
import com.scudata.util.Variant;

/**
 * ???????||
 * @author RunQian
 *
 */
public class Or extends Relation {
	public Or() {
		priority = PRI_OR;
	}

	/**
	 * ??????ʽ????Ч?ԣ???Ч???׳??쳣
	 */
	public void checkValidity() {
		if (left == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("\"||\"" + mm.getMessage("operator.missingLeftOperation"));
		} else if (right == null) {
			MessageManager mm = EngineMessage.get();
			throw new RQException("\"||\"" + mm.getMessage("operator.missingRightOperation"));
		}
		
		left.checkValidity();
		right.checkValidity();
	}

	public Object calculate(Context ctx) {
		Object value = left.calculate(ctx);
		if (Variant.isTrue(value)) {
			return Boolean.TRUE;
		} else {
			value = right.calculate(ctx);
			if (value instanceof Boolean) {
				return value;
			} else {
				return Boolean.valueOf(value != null);
			}
		}
	}

	/**
	 * ȡ??ֵ????ֵ?ıȽϹ?ϵ
	 * @return ??????Relation?еĳ???
	 */
	public int getRelation() {
		return OR;
	}
	
	/**
	 * ????????ֵ??λ?ã?ȡ??ֵ????ֵ?ıȽϹ?ϵ
	 * @return ??????Relation?еĳ???
	 */
	public int getInverseRelation() {
		return OR;
	}

	/**
	 * ??????????еĽ??
	 * @param ctx ??????????
	 * @return IArray
	 */
	public IArray calculateAll(Context ctx) {
		// ??????ʽ??trueʱ???????Ҳ????ʽ
		IArray leftResult = left.calculateAll(ctx);
		if (right instanceof Relation) {
			return ((Relation)right).calculateOr(ctx, leftResult);
		} else {
			IArray array = right.calculateAll(ctx, leftResult, false);
			return leftResult.calcRelation(array, OR);
		}
	}
	
	/**
	 * ????signArray??ȡֵΪsign????
	 * @param ctx
	 * @param signArray ?б?ʶ????
	 * @param sign ??ʶ
	 * @return IArray
	 */
	public IArray calculateAll(Context ctx, IArray signArray, boolean sign) {
		IArray leftResult = left.calculateAll(ctx, signArray, sign);
		if (right instanceof Relation) {
			return ((Relation)right).calculateOr(ctx, leftResult);
		} else {
			IArray array = right.calculateAll(ctx, leftResult, false);
			return leftResult.calcRelation(array, OR);
		}
	}
	
	/**
	 * ?????߼????????&&???Ҳ????ʽ
	 * @param ctx ??????????
	 * @param leftResult &&??????ʽ?ļ?????
	 * @return BoolArray
	 */
	public BoolArray calculateAnd(Context ctx, IArray leftResult) {
		// x1 and (x2 or x3)
		IArray result = calculateAll(ctx, leftResult, true);
		return leftResult.calcRelation(result, AND);
	}
	
	/**
	 * ?????߼????????||???Ҳ????ʽ
	 * @param ctx ??????????
	 * @param leftResult ||??????ʽ?ļ?????
	 * @return BoolArray
	 */
	public BoolArray calculateOr(Context ctx, IArray leftResult) {
		if (left instanceof Relation) {
			leftResult = ((Relation)left).calculateOr(ctx, leftResult);
		} else {
			IArray array = left.calculateAll(ctx, leftResult, false);
			leftResult = leftResult.calcRelation(array, OR);
		}

		if (right instanceof Relation) {
			return ((Relation)right).calculateOr(ctx, leftResult);
		} else {
			IArray array = right.calculateAll(ctx, leftResult, false);
			return leftResult.calcRelation(array, OR);
		}
	}

	/**
	 * ?жϸ?????ֵ??Χ?Ƿ????㵱ǰ????????ʽ
	 * @param ctx ??????????
	 * @return ȡֵ????Relation. -1??ֵ??Χ??û????????????ֵ??0??ֵ??Χ??????????????ֵ??1??ֵ??Χ??ֵ??????????
	 */
	public int isValueRangeMatch(Context ctx) {
		int result = left.isValueRangeMatch(ctx);
		if (result == ALLMATCH) {
			return result;
		}
		
		int rightResult = right.isValueRangeMatch(ctx);
		return result < rightResult ? rightResult : result;
	}
}