/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.util.digester;
import org.xml.sax.Attributes;
/**
* Concrete implementations of this class implement actions to be taken when
* a corresponding nested pattern of XML elements has been matched.
*/
public abstract class Rule {
// ----------------------------------------------------------- Constructors
/**
* <p>Base constructor.
* Now the digester will be set when the rule is added.</p>
*/
public Rule() {}
// ----------------------------------------------------- Instance Variables
/**
* The Digester with which this Rule is associated.
*/
protected Digester digester = null;
/**
* The namespace URI for which this Rule is relevant, if any.
*/
protected String namespaceURI = null;
// ------------------------------------------------------------- Properties
/**
* Identify the Digester with which this Rule is associated.
*
* @return the Digester with which this Rule is associated.
*/
public Digester getDigester() {
return digester;
}
/**
* Set the <code>Digester</code> with which this <code>Rule</code> is
* associated.
*
* @param digester The digester with which to associate this rule
*/
public void setDigester(Digester digester) {
this.digester = digester;
}
/**
* Return the namespace URI for which this Rule is relevant, if any.
*
* @return The namespace URI for which this rule is relevant or
* <code>null</code> if none.
*/
public String getNamespaceURI() {
return namespaceURI;
}
/**
* Set the namespace URI for which this Rule is relevant, if any.
*
* @param namespaceURI Namespace URI for which this Rule is relevant,
* or <code>null</code> to match independent of namespace.
*/
public void setNamespaceURI(String namespaceURI) {
this.namespaceURI = namespaceURI;
}
// --------------------------------------------------------- Public Methods
/**
* This method is called when the beginning of a matching XML element
* is encountered. The default implementation is a NO-OP.
*
* @param 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
* @param name the local name if the parser is namespace aware, or just
* the element name otherwise
* @param attributes The attribute list of this element
*
* @throws Exception if an error occurs while processing the event
*/
public void begin(String namespace, String name, Attributes attributes) throws Exception {
// NO-OP by default.
}
/**
* 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.
*
* @param 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
* @param name the local name if the parser is namespace aware, or just the
* element name otherwise
* @param text The text of the body of this element
*
* @throws Exception if an error occurs while processing the event
*/
public void body(String namespace, String name, String text) throws Exception {
// NO-OP by default.
}
/**
* This method is called when the end of a matching XML element
* is encountered. The default implementation is a NO-OP.
*
* @param 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
* @param 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
*/
public void end(String namespace, String name) throws Exception {
// NO-OP by default.
}
/**
* 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
*/
public void finish() throws Exception {
// NO-OP by default.
}
}