/*
* 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.ManagedBeanConfig;
import org.apache.shale.tiger.managed.config.ManagedPropertyConfig;
import org.xml.sax.Attributes;
/**
* <p>Digester rule for processing a <code><managed-property></code>
* element.</p>
*/
public class ManagedPropertyRule extends Rule {
/** Creates a new instance of ManagedPropertyRule. */
public ManagedPropertyRule() {
}
/** <p>Fully qualified class name of our configuration element bean.</p> */
private static final String CLASS_NAME =
"org.apache.shale.tiger.managed.config.ManagedPropertyConfig";
/**
* <p>Create a new {@link ManagedPropertyConfig} and push it on to the
* Digester stack.</p>
*
* @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());
}
/**
* <p>No body processing for this element.</p>
*
* @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 {
}
/**
* <p>Pop the {@link ManagedPropertyConfig} instance from the stack,
* and either add it or merge it with parent information.</p>
*
* @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 any other error occurs
*/
public void end(String namespace, String name) throws Exception {
ManagedPropertyConfig config = (ManagedPropertyConfig) digester.pop();
ManagedBeanConfig parent = (ManagedBeanConfig) digester.peek();
ManagedPropertyConfig previous = parent.getProperty(config.getName());
if (previous == null) {
parent.addProperty(config);
} else {
merge(config, previous);
}
}
/**
* <p>Merge properties from <code>config</code> into
* <code>previous</code>.</p>
*
* @param config Newly constructed bean
* @param previous Previous bean to merge into
*/
static void merge(ManagedPropertyConfig config, ManagedPropertyConfig previous) {
if (config.getType() != null) {
previous.setType(config.getType());
}
if (config.getValue() != null) {
previous.setValue(config.getValue());
}
if (config.isNullValue()) {
previous.setNullValue(true);
}
if (config.getListEntries() != null) {
if (previous.getListEntries() != null) {
ListEntriesRule.merge(config.getListEntries(), previous.getListEntries());
} else {
previous.setListEntries(config.getListEntries());
}
}
if (config.getMapEntries() != null) {
if (previous.getMapEntries() != null) {
MapEntriesRule.merge(config.getMapEntries(), previous.getMapEntries());
} else {
previous.setMapEntries(config.getMapEntries());
}
}
}
}