FunctionStringConstructorManager.java

package com.taobao.tddl.repo.mysql.sqlconvertor.functions;

import java.util.HashMap;
import java.util.Map;

import com.taobao.tddl.optimizer.core.expression.IFunction;

public class FunctionStringConstructorManager {

    static protected Map<String, FunctionStringConstructor> constructors       = null;
    
    static {
        constructors = new HashMap<String, FunctionStringConstructor>();
        constructors.put(IFunction.BuiltInFunction.INTERVAL, new DateIntervalFunction());
        constructors.put(IFunction.BuiltInFunction.GET_FORMAT, new GetFormat());
        constructors.put(IFunction.BuiltInFunction.TIMESTAMPADD, new TimestampAdd());
        constructors.put(IFunction.BuiltInFunction.TIMESTAMPDIFF, new TimestampDiff());
        constructors.put(IFunction.BuiltInFunction.CAST, new Cast());
    }

    public FunctionStringConstructor getConstructor(IFunction func) {
        if (constructors.containsKey(func.getFunctionName())) return constructors.get(func.getFunctionName());
        else return null;
    }
}