Source Code Cross Referenced for XSLTConfigDelegate.java in  » EJB-Server-JBoss-4.2.1 » varia » org » jboss » services » binding » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server JBoss 4.2.1 » varia » org.jboss.services.binding 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * JBoss, Home of Professional Open Source.
003:         * Copyright 2006, Red Hat Middleware LLC, and individual contributors
004:         * as indicated by the @author tags. See the copyright.txt file in the
005:         * distribution for a full listing of individual contributors.
006:         *
007:         * This is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU Lesser General Public License as
009:         * published by the Free Software Foundation; either version 2.1 of
010:         * the License, or (at your option) any later version.
011:         *
012:         * This software is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015:         * Lesser General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this software; if not, write to the Free
019:         * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021:         */
022:        package org.jboss.services.binding;
023:
024:        import java.io.StringReader;
025:        import javax.management.Attribute;
026:        import javax.management.MBeanServer;
027:        import javax.management.ObjectName;
028:        import javax.xml.transform.Transformer;
029:        import javax.xml.transform.TransformerFactory;
030:        import javax.xml.transform.dom.DOMResult;
031:        import javax.xml.transform.dom.DOMSource;
032:        import javax.xml.transform.stream.StreamSource;
033:
034:        import org.w3c.dom.Document;
035:        import org.w3c.dom.Element;
036:        import org.w3c.dom.NodeList;
037:        import org.w3c.dom.Node;
038:
039:        import org.jboss.logging.Logger;
040:        import org.jboss.metadata.MetaData;
041:        import org.jboss.util.StringPropertyReplacer;
042:
043:        /** An implementation of the ServicesConfigDelegate that expects a delegate-config
044:         element of the form:
045:         <delegate-config portName="portAttrName" hostName="hostAttrName">
046:         <xslt-config configName="ConfigurationElement"><![CDATA[
047:         XSL document contents...
048:         ]]>
049:         </xslt-config>
050:         <xslt-param name="p1">value1</xslt-param>
051:         </delegate-config>
052:         The portAttrName and hostAttrName are currently unused. Perhaps these should
053:         be used as the names of the host and port parameters in the XSL script. Currently
054:         the host and port bindings are passed into the XSL script as the 'host' and
055:         'port' global parameters.
056:
057:         The xslt-param elements specify arbitrary XSL script parameter name/value pairs
058:         that will be set on the Transformer.
059:
060:         @version $Revision: 57210 $
061:         @author Scott.Stark@jboss.org
062:         */
063:        public class XSLTConfigDelegate implements  ServicesConfigDelegate {
064:            private static Logger log = Logger
065:                    .getLogger(XSLTConfigDelegate.class);
066:
067:            /** Take the given config and map it onto the service specified in the
068:             config using JMX via the given server.
069:             @param config, the service name and its config bindings
070:             @param server, the JMX server to use to apply the config
071:             */
072:            public void applyConfig(ServiceConfig config, MBeanServer server)
073:                    throws Exception {
074:                Element delegateConfig = (Element) config
075:                        .getServiceConfigDelegateConfig();
076:                if (delegateConfig == null)
077:                    throw new IllegalArgumentException(
078:                            "ServiceConfig.ServiceConfigDelegateConfig is null");
079:
080:                // Get the XSL doc
081:                Element xslConfigElement = (Element) delegateConfig
082:                        .getElementsByTagName("xslt-config").item(0);
083:                String configName = xslConfigElement.getAttribute("configName");
084:                Node xslContent = xslConfigElement.getFirstChild();
085:                if (configName.length() == 0)
086:                    throw new IllegalArgumentException(
087:                            "No valid configName attribute found");
088:
089:                // Get the DOM config from the configName attribute
090:                ObjectName serviceName = new ObjectName(config.getServiceName());
091:                Element mbeanConfig = (Element) server.getAttribute(
092:                        serviceName, configName);
093:                if (mbeanConfig == null) {
094:                    log.debug("No value found for config attribute: "
095:                            + configName);
096:                    return;
097:                }
098:
099:                // Create the XSL transformer
100:                String xslText = xslContent.getNodeValue();
101:                log.trace("XSL text:" + xslText);
102:                StreamSource xslSource = new StreamSource(new StringReader(
103:                        xslText));
104:                TransformerFactory factory = TransformerFactory.newInstance();
105:                Transformer transformer = factory.newTransformer(xslSource);
106:
107:                // Only the first binding is used as only one (host,port) pair is mapped
108:                ServiceBinding[] bindings = config.getBindings();
109:                if (bindings != null && bindings.length > 0) {
110:                    int port = bindings[0].getPort();
111:                    String host = bindings[0].getHostName();
112:                    // Set the host an port params to that binding values
113:                    if (host != null) {
114:                        transformer.setParameter("host", host);
115:                        log.debug("set host parameter to:" + host);
116:                    }
117:                    transformer.setParameter("port", new Integer(port));
118:                    log.debug("set port parameter to:" + port);
119:
120:                    // Check for any arbitrary attributes
121:                    NodeList attributes = delegateConfig
122:                            .getElementsByTagName("xslt-param");
123:                    // xslt-param are transform parameters
124:                    for (int a = 0; a < attributes.getLength(); a++) {
125:                        Element attr = (Element) attributes.item(a);
126:                        String name = attr.getAttribute("name");
127:                        if (name.length() == 0)
128:                            throw new IllegalArgumentException(
129:                                    "attribute element #" + a
130:                                            + " has no name attribute");
131:                        String attrExp = MetaData.getElementContent(attr);
132:                        String attrValue = StringPropertyReplacer
133:                                .replaceProperties(attrExp);
134:                        transformer.setParameter(name, attrValue);
135:
136:                        log.debug("set " + name + " parameter to:" + attrValue);
137:                    }
138:
139:                    // Transform the current config element
140:                    DOMSource src = new DOMSource(mbeanConfig);
141:                    DOMResult result = new DOMResult();
142:                    transformer.transform(src, result);
143:                    // Write the transformed config back to the mbean
144:                    Document newMbeanDoc = (Document) result.getNode();
145:                    Element newMbeanConfig = newMbeanDoc.getDocumentElement();
146:                    log.debug("Updating DOM attribute to: " + newMbeanConfig);
147:                    Attribute mbeanConfigAttr = new Attribute(configName,
148:                            newMbeanConfig);
149:                    server.setAttribute(serviceName, mbeanConfigAttr);
150:                }
151:            }
152:
153:        }
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