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the hasor DataQL project.
There is a newer version: 4.2.5
/*
 * Copyright 2008-2009 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.hasor.dataql.runtime.inset;
import net.hasor.dataql.InvokerProcessException;
import net.hasor.dataql.OperatorProcess;
import net.hasor.dataql.ProcessException;
import net.hasor.dataql.runtime.InsetProcess;
import net.hasor.dataql.runtime.InstSequence;
import net.hasor.dataql.runtime.ProcessContet;
import net.hasor.dataql.runtime.Symbol;
import net.hasor.dataql.runtime.mem.MemStack;
import net.hasor.dataql.runtime.mem.StackStruts;
/**
 * DO 指令是用于进行 二元运算。
 * 该指令会通过运算符和被计算的表达式来寻找 OperatorProcess 运算实现类，进行运算。
 * 开发者可以通过实现 OperatorProcess 接口，覆盖某个运算符实现 运算符重载功能。
 * @author 赵永春([email protected])
 * @version : 2017-07-19
 */
class DO implements InsetProcess {
    @Override
    public int getOpcode() {
        return DO;
    }
    @Override
    public void doWork(InstSequence sequence, MemStack memStack, StackStruts local, ProcessContet context) throws ProcessException {
        String dyadicSymbol = sequence.currentInst().getString(0);
        Object secExpData = memStack.pop();
        Object fstExpData = memStack.pop();
        //
        Class fstType = (fstExpData == null) ? Void.class : fstExpData.getClass();
        Class secType = (secExpData == null) ? Void.class : secExpData.getClass();
        OperatorProcess process = context.findOperator(Symbol.Dyadic, dyadicSymbol, fstType, secType);
        //
        if (process == null) {
            throw new InvokerProcessException(getOpcode(), //
                    "DO -> type '" + fstType + "' and type '" + fstType + "' operation '" + dyadicSymbol + "' is not supported.");
        }
        //
        Object result = process.doProcess(DO, dyadicSymbol, new Object[] { fstExpData, secExpData }, context);
        memStack.push(result);
    }
}