net.hasor.dataql.runtime.inset.UO Maven / Gradle / Ivy
/*
* 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.domain.DataModel;
import net.hasor.dataql.runtime.InsetProcess;
import net.hasor.dataql.runtime.InsetProcessContext;
import net.hasor.dataql.runtime.InstSequence;
import net.hasor.dataql.runtime.QueryRuntimeException;
import net.hasor.dataql.runtime.mem.DataHeap;
import net.hasor.dataql.runtime.mem.DataStack;
import net.hasor.dataql.runtime.mem.EnvStack;
import net.hasor.dataql.runtime.operator.OperatorProcess;
/**
* UO // 一元运算
* - 参数说明：共1参数；参数1：一元操作符
* - 栈行为：消费1，产出1
* - 堆行为：无
*
* 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 UO implements InsetProcess {
@Override
public int getOpcode() {
return UO;
}
@Override
public void doWork(InstSequence sequence, DataHeap dataHeap, DataStack dataStack, EnvStack envStack, InsetProcessContext context) throws QueryRuntimeException {
String dyadicSymbol = sequence.currentInst().getString(0);
Object expData = dataStack.pop();
//
if (expData instanceof DataModel) {
expData = ((DataModel) expData).asOri();
}
//
Class expType = (expData == null) ? Void.class : expData.getClass();
OperatorProcess process = context.findUnaryOperator(dyadicSymbol, expType);
//
if (process == null) {
throw new QueryRuntimeException(sequence.programLocation(), "UO -> " + dyadicSymbol + " OperatorProcess is Undefined");
}
//
Object result = process.doProcess(sequence.programLocation(), dyadicSymbol, new Object[] { expData }, context.currentHints());
dataStack.push(result);
}
}