/**
* Copyright 2007-2008 非也
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation。
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses. *
*/
package org.fireflow.engine.condition;
import java.util.Map;
import org.apache.commons.jexl.Expression;
import org.apache.commons.jexl.ExpressionFactory;
import org.apache.commons.jexl.JexlContext;
import org.apache.commons.jexl.JexlHelper;
import org.fireflow.engine.IRuntimeContextAware;
import org.fireflow.engine.RuntimeContext;
/**
* 缺省使用apache的JEXL实现条件表达式的解析。
* @author 非也,nychen2000@163.com
*
*
*/
public class ConditionResolver implements IConditionResolver,
IRuntimeContextAware {
protected RuntimeContext rtCtx = null;
/*
* (non-Javadoc)
*
* @see
* org.fireflow.kenel.condition.IConditionResolver#resolveBooleanExpression
* (java.lang.String)
*/
public boolean resolveBooleanExpression(Map<String ,Object> vars, String elExpression)
throws Exception {
Expression expression = ExpressionFactory.createExpression(elExpression);
JexlContext jexlCtx = JexlHelper.createContext();
jexlCtx.setVars(vars);
Object obj = expression.evaluate(jexlCtx);
return (Boolean) obj;
}
public void setRuntimeContext(RuntimeContext ctx) {
rtCtx = ctx;
}
public RuntimeContext getRuntimeContext() {
return this.rtCtx;
}
}