org.apache.tomcat.util.digester

## Class Rule

- java.lang.Object
- - org.apache.tomcat.util.digester.Rule

- Direct Known Subclasses:
    CallMethodRule, CallParamRule, CertificateCreateRule, ConnectorCreateRule, CopyParentClassLoaderRule, FactoryCreateRule, LifecycleListenerRule, ObjectCreateRule, SetAllPropertiesRule, SetContextPropertiesRule, SetNextNamingRule, SetNextRule, SetPropertiesRule, StoreFactoryRule

      public abstract class Rule
      extends Object

  Concrete implementations of this class implement actions to be taken when a corresponding nested pattern of XML elements has been matched.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected Digester` | `digester` The Digester with which this Rule is associated.
    `protected String` | `namespaceURI` The namespace URI for which this Rule is relevant, if any.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Rule()` Base constructor.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `begin(String namespace, String name, Attributes attributes)` This method is called when the beginning of a matching XML element is encountered.
    `void` | `body(String namespace, String name, String text)` This method is called when the body of a matching XML element is encountered.
    `void` | `end(String namespace, String name)` This method is called when the end of a matching XML element is encountered.
    `void` | `finish()` This method is called after all parsing methods have been called, to allow Rules to remove temporary data.
    `Digester` | `getDigester()` Identify the Digester with which this Rule is associated.
    `String` | `getNamespaceURI()` Return the namespace URI for which this Rule is relevant, if any.
    `void` | `setDigester(Digester digester)` Set the `Digester` with which this `Rule` is associated.
    `void` | `setNamespaceURI(String namespaceURI)` Set the namespace URI for which this Rule is relevant, if any.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### digester

          protected Digester digester

      The Digester with which this Rule is associated.

    - #### namespaceURI

          protected String namespaceURI

      The namespace URI for which this Rule is relevant, if any.

  - ### Constructor Detail

    - #### Rule

          public Rule()

      Base constructor. Now the digester will be set when the rule is added.

  - ### Method Detail

    - #### getDigester

          public Digester getDigester()

      Identify the Digester with which this Rule is associated.
      Returns:
        the Digester with which this Rule is associated.

    - #### setDigester

          public void setDigester(Digester digester)

      Set the `Digester` with which this `Rule` is associated.
      Parameters:
        `digester` - The digester with which to associate this rule

    - #### getNamespaceURI

          public String getNamespaceURI()

      Return the namespace URI for which this Rule is relevant, if any.
      Returns:
        The namespace URI for which this rule is relevant or `null` if none.

    - #### setNamespaceURI

          public void setNamespaceURI(String namespaceURI)

      Set the namespace URI for which this Rule is relevant, if any.
      Parameters:
        `namespaceURI` - Namespace URI for which this Rule is relevant, or `null` to match independent of namespace.

    - #### begin

          public void begin(String namespace,
                   String name,
                   Attributes attributes)
                     throws Exception

      This method is called when the beginning of a matching XML element is encountered. The default implementation is a NO-OP.
      Parameters:
        `namespace` - the namespace URI of the matching element, or an empty string if the parser is not namespace aware or the element has no namespace
        `name` - the local name if the parser is namespace aware, or just the element name otherwise
        `attributes` - The attribute list of this element
      Throws:
        `Exception` - if an error occurs while processing the event

    - #### body

          public void body(String namespace,
                  String name,
                  String text)
                    throws Exception

      This method is called when the body of a matching XML element is encountered. If the element has no body, this method is not called at all. The default implementation is a NO-OP.
      Parameters:
        `namespace` - the namespace URI of the matching element, or an empty string if the parser is not namespace aware or the element has no namespace
        `name` - the local name if the parser is namespace aware, or just the element name otherwise
        `text` - The text of the body of this element
      Throws:
        `Exception` - if an error occurs while processing the event

    - #### end

          public void end(String namespace,
                 String name)
                   throws Exception

      This method is called when the end of a matching XML element is encountered. The default implementation is a NO-OP.
      Parameters:
        `namespace` - the namespace URI of the matching element, or an empty string if the parser is not namespace aware or the element has no namespace
        `name` - the local name if the parser is namespace aware, or just the element name otherwise
      Throws:
        `Exception` - if an error occurs while processing the event

    - #### finish

          public void finish()
                      throws Exception

      This method is called after all parsing methods have been called, to allow Rules to remove temporary data.
      Throws:
        `Exception` - if an error occurs while processing the event

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