parser spring-dm

gistfile1.py

# -*- coding: utf-8 -*-
'''
Created on Aug 11, 2012

@author: gengjet
'''

from xml.sax import make_parser, handler


class SuperBean():
    '''
    保存所有Bean的父亲
    '''
    
    def __init__(self, beanid, bundle):
        self._id = beanid
        self._bundle = bundle
        
class Bean(SuperBean):
    '''
    只是为<bean> 这个标签服务
    '''
    def __init__(self, bundle ,attrs):
       self._id = attrs.get("id")
       self._classname = attrs.get("class")
       self._bundle = bundle
       self.refs={}
       
    def addProperty(self, atts):
        '''
        这里的ref，可能是services，和bean。这个有点小麻烦。
        这里有两种情况，
        1. atts 中包括 name和ref两项
        1. atts 中只包括一项name，ref是在他的子节点中给出
        我只要求出ref相关的类名就可以了。
        '''
        if atts["name"] != None :
            self.refs[atts.get("name")] = atts.get("ref") if atts.get("ref") == None else ""
    
    def resolve(self,beans,refs):
        
        pass
    
    def __str__ (self):
        return "Bean (id= %s , bundle = %s , class=%s ) "  \
            %( self._id , self._bundle, self._classname )

class Service(Bean):
    '''
    发布出来的一个服务是一个服务,在这里 _classname,代表的是一个接口。
    '''
    
    def __init__(self, bundle ,attrs):
        self._id = attrs.get(u"id")
        self._bundle = bundle
        self._classname = attrs.get(u"interface")
        self._ref = attrs.get(u"ref")
        
    def resolve(self,beans):
        '''
        获取ref代表的真正的类
        '''
        pass
    
    def __str__ (self):
        return "Services (id= %s , bundle = %s , interface=%s , refName = %s) "  \
            %( self._id , self._bundle, self._classname , self._ref)

class ServiceRef(Bean):
    def __init__(self,attrs):
        self._id = attrs["id"]
        self._classname = attrs["interface"]
        
    def __str__ (self):
        return "ServiceRef (id= %s , bundle = %s , interface=%s ) "  \
            %( self._id , self._bundle, self._classname )

class BeanParser(handler.ContentHandler):
    '''
    就是一个简单的Xml解析解析器。获取其中的关于Service的信息。
    '''
    
    def __init__(self,bundle):
        '''
        Constructor
        '''
        self._beans = {}
        self._services={}
        self._refs = {}
        self._bundle = bundle
    
    def startElement(self,name , attrs):
        if u'osgi:service' == name :
            service = Service('myBundle', attrs)
            self._services[service._id] = service
            print "get a services %s" % service 
        elif u'bean'  == name :
            self.currentBean = Bean(self._bundle , attrs)
        elif u'property' == name :
            self.currentPropertyName = attrs["name"]
            self.currentBean.addProperty(attrs)
        elif u'ref' == name :
            if self.currentBean != None and self.currentPropertyName != None :
                self.currentBean.addProperty({"name":self.currentPropertyName,"ref":attrs["bean"]})
                print "add property %s to Bean %s" % (self.currentPropertyName, self.currentBean)
        elif u'osgi:reference' == name :
            osgiReference = ServiceRef(self._bundle,attrs)
            self._refs[osgiReference._id] = osgiReference
            print "handle bean interface is : %s" % attrs.get("interface") 
        #print name ,attrs
    
    def endElement(self, name):
        if u'bean' == name and self.currentBean != None:
            self._beans[self.currentBean._id] = self.currentBean
            self.currentBean = None
        elif u'property' == name :
            self.currentPropertyName = None
            print "add bean id is : %s" % self.currentBean
             
        handler.ContentHandler.endElement(self, name)