TextCalculator.java

package com.norteksoft.wf.engine.core.impl;

import org.apache.commons.lang.StringUtils;

import com.norteksoft.wf.base.enumeration.TextOperator;
import com.norteksoft.wf.engine.core.Computable;

/**
 * 文本相等、不等、包含、不包含的运算器
 */
public class TextCalculator implements Computable {

	public Boolean execute(String subExpression) {
		String operator = StringUtils.substringBetween(subExpression, "(", "\'").trim();
		String rightOperand = StringUtils.substringBetween(subExpression, "\'", "\'").trim();
		String leftOperand = StringUtils.substringBefore(subExpression, "(").trim();
		if(StringUtils.contains(operator, TextOperator.NET.getCode())){
			return !leftOperand.equals(rightOperand);
		}else if(StringUtils.contains(operator, TextOperator.ET.getCode())){
			return leftOperand.equals(rightOperand);
		}else if(StringUtils.contains(operator, TextOperator.NOT_CONTAINS.getCode())){
			return !StringUtils.contains(leftOperand, rightOperand);
		}else if(StringUtils.contains(operator, TextOperator.CONTAINS.getCode())){
			return StringUtils.contains(leftOperand, rightOperand);
		}
		throw new RuntimeException(subExpression + " is invalid expression.");
	}

}