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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.
*/
/* $Id$ */
package org.apache.fop.render;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fop.apps.FOPException;
import org.apache.fop.apps.FOUserAgent;
/**
* Configurator for XMLHandler objects.
*/
public class XMLHandlerConfigurator extends AbstractRendererConfigurator {
/** logger instance */
protected static final Log log = LogFactory.getLog(XMLHandlerConfigurator.class);
/**
* Default constructor
* @param userAgent the user agent
*/
public XMLHandlerConfigurator(FOUserAgent userAgent) {
super(userAgent);
}
/**
* Returns the configuration subtree for a specific renderer.
* @param cfg the renderer configuration
* @param namespace the namespace (i.e. the XMLHandler) for which the configuration should
* be returned
* @return the requested configuration subtree, null if there's no configuration
*/
private Configuration getHandlerConfig(Configuration cfg, String namespace) {
if (cfg == null || namespace == null) {
return null;
}
Configuration handlerConfig = null;
Configuration[] children = cfg.getChildren("xml-handler");
for (int i = 0; i < children.length; ++i) {
try {
if (children[i].getAttribute("namespace").equals(namespace)) {
handlerConfig = children[i];
break;
}
} catch (ConfigurationException e) {
// silently pass over configurations without namespace
}
}
if (log.isDebugEnabled()) {
log.debug((handlerConfig == null ? "No" : "")
+ "XML handler configuration found for namespace " + namespace);
}
return handlerConfig;
}
/**
* Configures renderer context by setting the handler configuration on it.
* @param context the RendererContext (contains the user agent)
* @param ns the Namespace of the foreign object
* @throws FOPException if configuring the target objects fails
*/
public void configure(RendererContext context, String ns) throws FOPException {
//Optional XML handler configuration
Configuration cfg = getRendererConfig(context.getRenderer());
if (cfg != null) {
cfg = getHandlerConfig(cfg, ns);
if (cfg != null) {
context.setProperty(RendererContextConstants.HANDLER_CONFIGURATION, cfg);
}
}
}
}
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