bizatomstatement.java

这个是使用java开发的一个平台

package com.exp.bizatom.auto.statement;

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

import com.exp.bizatom.auto.BizAutoAtomLogic;
import com.exp.fcl.interfaces.Prototype;
import com.exp.fcl.xml.EXPXMLNode;

/**
 * 业务处理语句基类
 * <p>
 * Title: jstrd 基础技术平台
 * </p>
 * <p>
 * Description: jstrd 基础技术平台
 * </p>
 * <p>
 * Copyright: Copyright (c)  jstrd 2004-2008
 * </p>
 * <p>
 * Company: jstrd
 * </p>
 * 
 * @author zhanghf
 * @version 3.0.0.0
 */
public abstract class BizAtomStatement implements Prototype {
    protected String override = "";

    /**
     * 得到重定义的行号
     * 
     * @return
     */
    public String override() {
        return this.override;
    }

    /**
     * 解析配置信息
     * 
     * @param node
     */
    void parseConfig(EXPXMLNode node) {
        this.override = node.getAttributeValue("override");
        this.parse(node);
    }

    /**
     * 解析配置信息
     * 
     * @param node
     */
    protected abstract void parse(EXPXMLNode node);

    /**
     * 执行语句
     * 
     * @param function
     *            当前业务逻辑
     * @param row
     *            当前行号
     * @return 下一行
     * @throws java.lang.Throwable
     */
    public abstract int execute(BizAutoAtomLogic function, int row)
            throws Throwable;

    private static final Map cmds = new HashMap();
    static {
        registerStatement("set-property", SetVOBizAtomStatement.class);
        registerStatement("set-property-list", SetListBizAtomStatement.class);
        registerStatement("return", ReturnBizAtomStatement.class);
        registerStatement("set-return", SetReturnBizAtomStatement.class);
        registerStatement("block", BlockBizAtomStatement.class);
        registerStatement("condition", ConditionBizAtomStatement.class);
        registerStatement("condition-rule", ConditionExBizAtomStatement.class);
        registerStatement("set-var", SetVariableBizAtomStatement.class);
        registerStatement("command", CommandBizAtomStatement.class);
        registerStatement("empty", EmptyBizAtomStatement.class);
        registerStatement("set-rollback", SetRollbackBizAtomStatement.class);
        registerStatement("print", PrintBizAtomStatement.class);
        registerStatement("call", CallBizAtomStatement.class);
    }

    /**
     * 注册语句
     * 
     * @param cmd
     *            命令名称
     * @param cls
     *            实现类
     */
    public static void registerStatement(String cmd, Class cls) {
        cmds.put(cmd.toLowerCase(), cls);
    }

    /**
     * 得到指定语句
     * 
     * @param cmd
     *            命令名称
     * @return
     */
    public static BizAtomStatement getRegStatement(String cmd) {
        Class cls = (Class) cmds.get(cmd.toLowerCase());
        if (cls != null) {
            try {
                return (BizAtomStatement) cls.newInstance();
            } catch (Exception e) {

            }
            return null;
        } else {
            return new EmptyBizAtomStatement("DUAL");
        }
    }

    /**
     * 根据配置节点创建语句
     * 
     * @param node
     * @return
     */
    public static BizAtomStatement buildStatement(EXPXMLNode node) {
        String cmdName = node.getNodeName();
        BizAtomStatement statement = getRegStatement(cmdName);
        if (statement != null) {
            statement.parseConfig(node);
            return statement;
        }
        return null;
    }
}