/*
* This program is free software; you can redistribute it and/or modify it under the terms of
* the GNU AFFERO GENERAL PUBLIC LICENSE as published by the Free Software Foundation; either version 3 of the License,
* or (at your option) any later version.
*
* 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 AFFERO GENERAL PUBLIC LICENSE for more details.
* You should have received a copy of the GNU AFFERO GENERAL PUBLIC LICENSE along with this program;
* if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package com.meidusa.amoeba.parser.expression;
import java.util.ArrayList;
import java.util.List;
import com.meidusa.amoeba.parser.function.Function;
import com.meidusa.amoeba.parser.function.RealtimeCalculator;
import com.meidusa.amoeba.sqljep.ParseException;
/**
* �������ʽ
* @author <a href=mailto:piratebase@sina.com>Struct chen</a>
*
*/
public class FunctionExpression extends Expression {
private Function function;
private List<Expression> argList = new ArrayList<Expression>();
public List<Expression> getArgList() {
return argList;
}
public void setArgList(List<Expression> argList) {
this.argList = argList;
}
/**
* ���������ʽ ���� ���ʽ����
*
* @param expression
*/
public void addArgExpression(Expression expression) {
argList.add(expression);
}
public Function getFunction() {
return function;
}
public void setFunction(Function function) {
this.function = function;
}
public boolean isRealtime() {
boolean isRealTime = (function instanceof RealtimeCalculator);
if (isRealTime) return true;
for (Expression e : argList) {
if (e.isRealtime()) {
return true;
}
}
return false;
}
@SuppressWarnings("unchecked")
@Override
public Comparable evaluate(Object[] parameters) {
try {
return function.evaluate(argList, parameters);
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}
@Override
public Expression reverse() {
return this;
}
@Override
protected void toString(StringBuilder builder) {
function.toString(argList, builder);
}
}