org.apache.shale.tiger.managed.rules.MapEntryRule Maven / Gradle / Ivy
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/*
* 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.shale.tiger.managed.rules;
import org.apache.commons.digester.Rule;
import org.apache.shale.tiger.managed.config.MapEntriesConfig;
import org.apache.shale.tiger.managed.config.MapEntryConfig;
import org.xml.sax.Attributes;
/**
* Digester rule for processing a <map-entry>
* element.
*/
public class MapEntryRule extends Rule {
/** Creates a new instance of MapEntryRule. */
public MapEntryRule() {
}
/** Fully qualified class name of our configuration element bean.
*/
private static final String CLASS_NAME =
"org.apache.shale.tiger.managed.config.MapEntryConfig";
/**
* Create a new {@link MapEntryConfig} and push it on to the
* Digester stack.
*
* @param namespace Namespace URI of the matching element
* @param name Local name of the matching element
* @param attributes Attribute list of the matching element
*
* @exception Exception if a parsing error occurs
*/
public void begin(String namespace, String name,
Attributes attributes) throws Exception {
Class clazz = digester.getClassLoader().loadClass(CLASS_NAME);
digester.push(clazz.newInstance());
}
/**
* No body processing for this element.
*
* @param namespace Namespace URI of the matching element
* @param name Local name of the matching element
*
* @throws Exception if a parsing error occurs
*/
public void body(String namespace, String name) throws Exception {
}
/**
* Pop the {@link MapEntriesConfig} instance from the stack,
* and either add it or merge it with parent information.
*
* @param namespace Namespace URI of the matching element
* @param name Local name of the matching element
*
* @exception IllegalStateException if the popped object is not
* of the correct type
* @exception Exception if a different error occurs
*/
public void end(String namespace, String name) throws Exception {
MapEntryConfig config = (MapEntryConfig) digester.pop();
MapEntriesConfig parent = (MapEntriesConfig) digester.peek();
MapEntryConfig previous = parent.getEntry(config.getKey());
if (previous == null) {
parent.addEntry(config);
} else {
merge(config, previous);
}
}
/**
* Merge properties from config into
* previous.
*
* @param config Newly constructed bean
* @param previous Previous bean to merge into
*/
static void merge(MapEntryConfig config, MapEntryConfig previous) {
previous.setValue(config.getValue());
}
}