com.ql.util.express.instruction.CastInstructionFactory Maven / Gradle / Ivy

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QLExpress is a powerful, lightweight, dynamic language for the Java platform aimed at improving developers’ productivity in different business scenes.

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package com.ql.util.express.instruction;

import java.util.Stack;

import com.ql.util.express.ExpressRunner;
import com.ql.util.express.InstructionSet;
import com.ql.util.express.exception.QLException;
import com.ql.util.express.instruction.detail.InstructionOperator;
import com.ql.util.express.instruction.op.OperatorBase;
import com.ql.util.express.parse.ExpressNode;

public class CastInstructionFactory extends InstructionFactory {
    @Override
    public boolean createInstruction(ExpressRunner expressRunner, InstructionSet result,
        Stack forStack, ExpressNode node, boolean isRoot) throws Exception {
        boolean returnVal = false;
        OperatorBase op = expressRunner.getOperatorFactory().newInstance(node);
        ExpressNode[] children = node.getChildrenArray();
        if (children.length == 0) {
            throw new QLException("扩展类型不存在");
        } else if (children.length > 2) {
            throw new QLException("扩展操作只能有一个类型为Class的操作数");
        } else if (!children[0].getNodeType().isEqualsOrChild("CONST_CLASS")) {
            throw new QLException("扩展操作只能有一个类型为Class的操作数,当前的数据类型是：" + children[0].getNodeType().getName());
        }

        for (ExpressNode child : children) {
            boolean tmpHas = expressRunner.createInstructionSetPrivate(result, forStack, child, false);
            returnVal = returnVal || tmpHas;
        }
        result.addInstruction(new InstructionOperator(op, children.length).setLine(node.getLine()));
        return returnVal;
    }
}