选择具有XPath的节点以使用JAXB绑定类的子集

时间:2012-02-10 16:47:09

标签: xml xpath jaxb xsd xjc

简化问题: 什么是XPath选择具有以字符串“Notification”结尾的属性的所有XML节点。此代码段中的第一个和第三个节点:

 <events>
   <event name="CreatedNotification" />
   <event name="InfoLog" />
   <event name="UpdatedNotification" />
 </events>

详细问题:

我想从xsd架构中选择多个complexTypes来与JAXB绑定。这适用于单个类:OrderStateChangeNotification

<jxb:bindings schemaLocation="apiv2.xsd">
  <jxb:bindings node="//xs:complexType[@name='OrderStateChangeNotification']">
    <inheritance:implements>com.google.checkout.sdk.notifications.Notification</inheritance:implements> 
  </jxb:bindings>
</jxb:bindings>

以下是架构架构文件中的相关代码段:

  <xs:complexType name="OrderStateChangeNotification">
    <xs:all>
      <xs:element name="new-fulfillment-order-state" type="tns:FulfillmentOrderState" />
      <xs:element name="new-financial-order-state" type="tns:FinancialOrderState" />
      <xs:element name="previous-fulfillment-order-state" type="tns:FulfillmentOrderState" />
      <xs:element name="previous-financial-order-state" type="tns:FinancialOrderState" />
      <xs:element name="reason" type="xs:string" minOccurs="0" />
      <xs:element name="timestamp" type="xs:dateTime" />
      <xs:element name="google-order-number" type="xs:token" />
      <xs:element name="order-summary" type="tns:OrderSummary" minOccurs="0" />
    </xs:all>
    <xs:attribute name="serial-number" type="xs:string" use="required" />
  </xs:complexType>

  <xs:complexType name="ChargeAmountNotification">
    <xs:all>
      <xs:element name="timestamp" type="xs:dateTime" />
      <xs:element name="latest-charge-amount" type="tns:Money" />
      <xs:element name="latest-charge-fee" type="tns:FeeStructure" minOccurs="0" />
      <xs:element name="total-charge-amount" type="tns:Money" />
      <xs:element name="latest-promotion-charge-amount" type="tns:Money" minOccurs="0" />
      <xs:element name="google-order-number" type="xs:token" />
      <xs:element name="order-summary" type="tns:OrderSummary" minOccurs="0" />
    </xs:all>
    <xs:attribute name="serial-number" type="xs:string" use="required" />
  </xs:complexType>

我希望绑定适用于所有通知对象。他们都以“通知”结束

我尝试从

更改XPath
//xs:complexType[@name='OrderStateChangeNotification']

//xs:complexType[substring(name(), string-length(name()) - 12) = 'Notification']

但它不起作用。

另一种方法是尝试选择具有子项“order-summary”和“serial-number”的所有节点,因为我知道只有Notification对象具有这些。

更新 @Lee Greco的解决方案正确地选择了我想要的节点,但不幸的是,继承插件与多个节点不兼容:

[ERROR] XPath evaluation of "//xs:complexType[substring(@name, string-length(@name)-string-length('Notification')+1)='Notification']" results in too many (8) target nodes

我最后只是单独枚举它们。

3 个答案:

答案 0 :(得分:5)

使用

//xs:complexType[substring(name(), string-length(name()) - 12) = 'Notification']

表达式,您要求元素名称以“通知”结尾的所有元素。您真的想要询问名称属性以“通知”结尾的所有元素。

请改为尝试:

//xs:complexType[substring(@name, string-length(@name)-string-length("Notification")+1)="Notification"]

答案 1 :(得分:5)

我遇到了同样的问题。我发现XJC使用了multiple属性来允许多个节点匹配。

我还希望将绑定应用于每个架构位置。 xs:anyURI无效,但我找到了使用*令牌的方法。我添加了required="false"属性,以便忽略不包含任何匹配的模式。

<jxb:bindings schemaLocation="*">
  <jxb:bindings node="//xs:complexType[substring(name(), string-length(name()) - 12) = 'Notification']" multiple="true" required="false">
    <inheritance:implements>com.google.checkout.sdk.notifications.Notification</inheritance:implements> 
  </jxb:bindings>
</jxb:bindings>

修改:我发布了这个答案而没有阅读问题的评论。对不起。我正在使用maven插件org.codehaus.mojo:jaxb2-maven-plugin:1.5和XJC插件org.jvnet.jaxb2_commons:jaxb2-basics-project:0.6.4,它看起来像这样......

答案 2 :(得分:0)

我最终遇到了类似的问题&#34;目标节点太多(3)&#34;然而,在任何网站上找不到任何答案......发布我经过大量追踪和错误后发现的解决方案...解决的基本思路&#34;太多的目标节点(3)&#34;是提供XSD中多个节点的完整XPATH。

以下是我的XSD:

<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="document">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="asset">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="attribute" maxOccurs="unbounded" minOccurs="0">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element name="string" minOccurs="0">
                      <xs:complexType>
                        <xs:simpleContent>
                          <xs:extension base="xs:string">
                            <xs:attribute type="xs:string" name="value" use="optional"/>
                          </xs:extension>
                        </xs:simpleContent>
                      </xs:complexType>
                    </xs:element>
                    <xs:element name="date" minOccurs="0">
                      <xs:complexType>
                        <xs:simpleContent>
                          <xs:extension base="xs:string">
                            <xs:attribute type="xs:string" name="value" use="optional"/>
                          </xs:extension>
                        </xs:simpleContent>
                      </xs:complexType>
                    </xs:element>
                    <xs:element name="array" minOccurs="0">
                      <xs:complexType>
                        <xs:sequence>
                          <xs:element name="struct"  maxOccurs="unbounded" minOccurs="0">
                            <xs:complexType>
                              <xs:sequence>
                                <xs:element name="field" maxOccurs="unbounded" minOccurs="0">
                                  <xs:complexType>
                                    <xs:sequence>
                                      <xs:element name="integer" minOccurs="0">
                                        <xs:complexType>
                                          <xs:simpleContent>
                                            <xs:extension base="xs:string">
                                              <xs:attribute type="xs:byte" name="value"/>
                                            </xs:extension>
                                          </xs:simpleContent>
                                        </xs:complexType>
                                      </xs:element>
                                      <xs:element name="assetreference" minOccurs="0">
                                        <xs:complexType>
                                          <xs:simpleContent>
                                            <xs:extension base="xs:string">
                                              <xs:attribute type="xs:string" name="type"/>
                                              <xs:attribute type="xs:long" name="value"/>
                                            </xs:extension>
                                          </xs:simpleContent>
                                        </xs:complexType>
                                      </xs:element>
                                    </xs:sequence>
                                    <xs:attribute type="xs:string" name="name" use="optional"/>
                                  </xs:complexType>
                                </xs:element>
                              </xs:sequence>
                            </xs:complexType>
                          </xs:element>
                          <xs:element name="integer" minOccurs="0">
                            <xs:complexType>
                              <xs:simpleContent>
                                <xs:extension base="xs:string">
                                  <xs:attribute type="xs:long" name="value"/>
                                </xs:extension>
                              </xs:simpleContent>
                            </xs:complexType>
                          </xs:element>
                        </xs:sequence>
                      </xs:complexType>
                    </xs:element>
                    <xs:element name="file" minOccurs="0">
                      <xs:complexType>
                        <xs:simpleContent>
                          <xs:extension base="xs:string">
                            <xs:attribute type="xs:string" name="name" use="optional"/>
                          </xs:extension>
                        </xs:simpleContent>
                      </xs:complexType>
                    </xs:element>
                    <xs:element name="integer" minOccurs="0">
                      <xs:complexType>
                        <xs:simpleContent>
                          <xs:extension base="xs:string">
                            <xs:attribute type="xs:short" name="value"/>
                          </xs:extension>
                        </xs:simpleContent>
                      </xs:complexType>
                    </xs:element>
                  </xs:sequence>
                  <xs:attribute type="xs:string" name="name" use="optional"/>
                </xs:complexType>
              </xs:element>
            </xs:sequence>
            <xs:attribute type="xs:long" name="id"/>
            <xs:attribute type="xs:string" name="type"/>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

及以下是适用于上述XSD的JAXB绑定文件:

<bindings xmlns="http://java.sun.com/xml/ns/jaxb"
          xmlns:xsi="http://www.w3.org/2000/10/XMLSchema-instance"
          xmlns:xs="http://www.w3.org/2001/XMLSchema"
          version="2.1">
    <bindings schemaLocation= "../assetproduct.xsd" version="1.0">
        <!-- Customise the package name 
        <schemaBindings>
            <package name="com.example.schema"/>
        </schemaBindings> -->

        <!-- rename the value element -->
        <bindings node="//xs:element[@name='document']">
            <bindings node="//xs:element[@name='asset']">
                <bindings node="//xs:element[@name='attribute']">

                    <bindings node="//xs:element[@name='string']">
                        <bindings node=".//xs:attribute[@name='value']">
                            <property name="ValueAttribute"/>
                        </bindings>
                    </bindings>


                    <bindings node="//xs:element[@name='date']">
                        <bindings node=".//xs:attribute[@name='value']">
                            <property name="ValueAttribute"/>
                        </bindings>
                    </bindings>

                    <bindings node="//xs:element[@name='array']">

                        <bindings node=".//xs:element[@name='struct']">
                            <bindings node=".//xs:element[@name='field']">

                                <bindings node=".//xs:element[@name='integer']/xs:complexType">
                                    <bindings node=".//xs:attribute[@name='value']">
                                        <property name="ValueAttribute"/>
                                    </bindings>
                                </bindings>

                                <bindings node=".//xs:element[@name='assetreference']">
                                    <bindings node=".//xs:attribute[@name='value']">
                                        <property name="ValueAttribute"/>
                                    </bindings>
                                </bindings>

                            </bindings>
                        </bindings>

                    </bindings>

                    <bindings node=".//xs:element[@name='array']/xs:complexType/xs:sequence/xs:element[@name='integer']">
                            <bindings node=".//xs:attribute[@name='value']">
                                <property name="ValueAttribute"/>
                            </bindings>
                    </bindings>

                    <bindings node="//xs:element[@name='attribute']/xs:complexType/xs:sequence/xs:element[@name='integer']">
                        <bindings node=".//xs:attribute[@name='value']">
                            <property name="ValueAttribute"/>
                        </bindings>
                    </bindings>
                </bindings>
            </bindings>
          </bindings>
    </bindings>
</bindings>