基于Spring开发之自定义标签及其解析

<bf:head-routing key="1" value="1" to="test2"/>

<!-- 声明一个标签，名字为head-routing，他的类型为headRouting-->
<xsd:element name="head-routing" type="headRouting"></xsd:element>

  <!-- 定义head-routing的类型，这里定义它有key,value,to,patten四个属性 -->
  <xsd:complexType name="headRouting">
    <xsd:attribute name="key" type="xsd:string" use="required"></xsd:attribute>
    <xsd:attribute name="value" type="xsd:string" use="required"></xsd:attribute>
    <xsd:attribute name="to" type="xsd:IDREF" use="required"></xsd:attribute>
    <xsd:attribute name="patten" type="xsd:string" default="string"></xsd:attribute>
  </xsd:complexType>

  <bf:stop id="test1" ref="testNode">
    <bf:head-routing key="1" value="1" to="test2"/>
  </bf:stop>

  <xsd:element name="stop">
    <xsd:complexType>
      <xsd:complexContent>
        <xsd:extension base="beans:identifiedType">
          <xsd:group ref="stopElements"/>
          <xsd:attributeGroup ref="stopAttributes"/>
        </xsd:extension>
      </xsd:complexContent>
    </xsd:complexType>
  </xsd:element>

<xsd:extension base="beans:identifiedType"> 定义了该标签的id属性，注意这里引用的是spring-beans中的type，
<xsd:group ref="stopElements"/>中定义了<bf:stop>标签允许的子标签
<xsd:attributeGroup ref="stopAttributes"/> 定义了<bf:stop>标签允许的属性
  <xsd:group name="stopElements">
    <xsd:sequence>
      <xsd:element ref="description" minOccurs="0"/>
      <xsd:choice minOccurs="0" maxOccurs="unbounded">
        <xsd:element ref="head-routing"/>
         <!-- 有更多的子标签继续在这里添加，例如<xsd:element ref="properties"/> -->
      </xsd:choice>
    </xsd:sequence>
  </xsd:group>


  <xsd:attributeGroup name="stopAttributes">
    <xsd:attribute name="ref" type="xsd:IDREF" use="required">
      <xsd:annotation>         
        <xsd:appinfo>
           <!-- 这里是使用了Spring tool xsd中的标签,格式校验-->
          <tool:annotation kind="ref">
            <tool:expected-type type="com.lizo.node.Station"/>
          </tool:annotation>
        </xsd:appinfo>
      </xsd:annotation>
    </xsd:attribute>
    <!-- 有更多的子标签继续在这里添加，例如<xsd:attribute name="value" type="xsd:string"/> -->

<beans
    ..
    xmlns:bf="http://www.lizo.com/schema/bf"
    xsi:schemaLocation="
    ...
    http://www.lizo.com/schema/bf
    http://www.lizo.com/schema/bf.xsd
    ">

  <bf:stop id="test123" ref="testNode">
    <bf:head-routing key="1" value="1" to="test1"/>
    <bf:head-routing key="3" value="4" to="test2"/>
  </bf:stop>

public class BusinessFlowNamespaceHandlerSupport extends NamespaceHandlerSupport {
  public void init() {
    //注册用于解析<bf:stop>的解析器
    registerBeanDefinitionParser("stop", new BusinessFlowBeanDefinitionParser());
  }
}

public interface BeanDefinitionParser {
  BeanDefinition parse(Element element, ParserContext parserContext);
}

RootBeanDefinition nodeWrapDefinition = new RootBeanDefinition();
//该BeanDefinition对应的是什么类
nodeWrapDefinition.setBeanClass(StationRoutingWrap.class);
//name是解析标签后获得的值
nodeWrapDefinition.getPropertyValues().addPropertyValue("name", name);

RuntimeBeanReference refBean = new RuntimeBeanReference(ref);
    nodeWrapDefinition.getPropertyValues().addPropertyValue("station", refBean);

ManagedList routingConditions = new ManagedList();
....
nodeWrapDefinition.getPropertyValues().add("routing", routing);