/*
* Copyright 2005-2007 WSO2, Inc. (http://wso2.com)
*
* Licensed 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.wso2.carbon.utils.component.xml;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.impl.builder.StAXOMBuilder;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.CarbonException;
import org.wso2.carbon.utils.component.xml.builder.ComponentConfigBuilder;
import org.wso2.carbon.utils.component.xml.builder.DeployerConfigBuilder;
import org.wso2.carbon.utils.component.xml.builder.HTTPGetRequestProcessorConfigBuilder;
import org.wso2.carbon.utils.component.xml.builder.ManagementPermissionsBuilder;
import org.wso2.carbon.utils.component.xml.config.ComponentConfig;
import javax.xml.namespace.QName;
import java.io.InputStream;
import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class ComponentConfigFactory implements ComponentConstants {
private static Log log = LogFactory.getLog(ComponentConfigFactory.class);
private static Map<String, ComponentConfigBuilder> defaultConfigBuilderMap = new ConcurrentHashMap<String, ComponentConfigBuilder>();
// Statically initializing and registering common config builders.
static {
DeployerConfigBuilder deployerBuilder = new DeployerConfigBuilder();
HTTPGetRequestProcessorConfigBuilder httpBuilder = new HTTPGetRequestProcessorConfigBuilder();
ManagementPermissionsBuilder permisisonBuilder = new ManagementPermissionsBuilder();
defaultConfigBuilderMap.put(deployerBuilder.getLocalNameOfComponentConfigElement(),
deployerBuilder);
defaultConfigBuilderMap
.put(httpBuilder.getLocalNameOfComponentConfigElement(), httpBuilder);
defaultConfigBuilderMap.put(permisisonBuilder.getLocalNameOfComponentConfigElement(),
permisisonBuilder);
}
public static void addComponentBuilder(String configKey,
ComponentConfigBuilder componentConfigBuilder) {
defaultConfigBuilderMap.put(configKey, componentConfigBuilder);
}
@SuppressWarnings("unchecked")
public static Component build(InputStream xmlStream) throws CarbonException {
if (xmlStream == null) {
throw new CarbonException("component.xml stream is null..");
}
StAXOMBuilder builder = null;
Component component;
try {
builder = new StAXOMBuilder(xmlStream);
OMElement document = builder.getDocumentElement();
// Processing custom component builders if any,
OMElement compBuilderEle = document.getFirstChildWithName(new QName(NS_WSO2CARBON,
ELE_COMPONENT_BUILDERS));
if (compBuilderEle != null) {
processCustomBuilders(compBuilderEle);
}
component = new Component();
for (Iterator itr = document.getChildElements(); itr.hasNext();) {
OMElement configElement = (OMElement) itr.next();
String configKey = configElement.getLocalName();
ComponentConfigBuilder configBuilder = defaultConfigBuilderMap.get(configKey);
if (configBuilder == null)
continue;
ComponentConfig[] componentConfig = configBuilder.build(configElement);
if (componentConfig != null)
component.addComponentConfig(configKey, componentConfig);
}
} catch (Exception e) {
String msg = "Failed to build component configuration.";
log.error(msg, e);
throw new CarbonException(msg, e);
}
return component;
}
@SuppressWarnings("unchecked")
private static void processCustomBuilders(OMElement buildersElement) throws CarbonException {
for (Iterator iterator = buildersElement.getChildrenWithName(new QName(NS_WSO2CARBON,
ELE_COMPONENT_BUILDER)); iterator.hasNext();) {
OMElement builderElement = (OMElement) iterator.next();
// class element
OMElement classElement = builderElement.getFirstChildWithName(new QName(NS_WSO2CARBON,
ELE_CLASS));
String classString = null;
if (classElement != null)
classString = classElement.getText().trim();
if (classString == null)
throw new CarbonException(
"Mandatory attribute custom component builder/name entry "
+ "does not exist or is empty in the component.xml");
Class deployerClass = null;
try {
deployerClass = Class.forName(classString);
ComponentConfigBuilder configBuilder = (ComponentConfigBuilder) deployerClass
.newInstance();
defaultConfigBuilderMap.put(configBuilder.getLocalNameOfComponentConfigElement(),
configBuilder);
} catch (Exception e) {
throw new CarbonException(e);
}
}
}
}