Examples of com.sun.enterprise.config.ConfigContext

com.sun.enterprise.config.ConfigContext
A configuration context represents a heirarchical view of the configuration attributes. It reads the configuration attributes from server.xml The configuration context has a one-to-one realationship with a configuration file. There is no public constructor. Use ConfigFactory to construct ConfigContext. This object can be made readOnly and autoCommit during creation but these parameters cannot be changed once the object is created. Note that this object might be shared by number of threads. Here are some examples of code to illustrate lookup: 1. If you want to specifically locate a Node in the configuration: example: jms resource in server.xml
```
 ConfigBean conBean =  ctx.exactLookup("/server/resources/jms-resource[@name='jms1']"); 
```
Follow the syntax below for creating xpath expression for use in lookup/exactLookup. This is the only syntax supported.
```
 expression := /tagName | /tagName/tagExpression tagExpression := tagName| tagName[@name='value'] | tagName/tagExpression | tagName[@name='value']/tagExpression 
```
Config API documentation: Config API is a powerful set of APIs that handle comples operations like:
```
 1. Basic Configuration (set and get elements and attributes APIs) 2. Event Notification 3. Cloning 4. XPath support 5. Change Mananagement (add, update, delete, set) 6. readonly 7. Auto Commit 8. Advanced Configuration (1 API to access attributes--ctx.getAttribute()) 9. Intelligent refresh 10. Get dtd default values 11. DOM like API support (appendChild, removeChild) 12. Find APIs 13. Support Serialization and DeSerialization 14. Other Misc APIs (getChildBeansByName, getXPath, etc) 15. Merge APIs 
```

    * Get the cluster name from domain.xml for this server.
    * return null if not found
    */ 
    public String getClusterName() {
        String result = null;
        ConfigContext configCtx = this.getConfigContext();
        
        String serverName = this.getServerName();
        if(serverName == null) {
            return result;
        }

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        return result;
    }
    
    public ArrayList getServerNamesInCluster() {
        ArrayList result = new ArrayList();
        ConfigContext configCtx = this.getConfigContext();        
        String serverName = this.getServerName();
        //this should not happen
        if(serverName == null) {
            return result;
        }

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    /**
     * Get the cluster if the server is in a cluster
     * return null if not
     */    
    public Cluster getCluster() {
        ConfigContext configCtx = this.getConfigContext();
        String serverName = this.getServerName();
        boolean isClustered = false;
        try {
            isClustered = ServerHelper.isServerClustered(configCtx, serverName);
        } catch (ConfigException ex) {}

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    * return null if not found
    */    
    private Resources getResourcesBean() {
        Resources resourcesBean = null;
        Domain domainBean = null;
        ConfigContext configCtx = this.getConfigContext();
        try {
            domainBean = ServerBeansFactory.getDomainBean(configCtx);
            if(domainBean != null) {
                resourcesBean = domainBean.getResources();
            }

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    * return null if not found
    */     
    private Applications getApplicationsBean() {
        Applications applicationsBean = null;
        Domain domainBean = null;
        ConfigContext configCtx = this.getConfigContext();
        try {
            domainBean = ServerBeansFactory.getDomainBean(configCtx);
            if(domainBean != null) {
                applicationsBean = domainBean.getApplications();
            }

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    * return null if not found
    */     
    private Applications getApplicationsBeanDynamic() {
        Applications applicationsBean = null;
        Domain domainBean = null;
        ConfigContext configCtx = this.getConfigContextDynamic();
        try {
            domainBean = ServerBeansFactory.getDomainBean(configCtx);
            if(domainBean != null) {
                applicationsBean = domainBean.getApplications();
            }

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    * Get the config element from domain.xml.
    * return null if not found
    */     
    private Config getConfigBean() {
        Config configBean = null;
        ConfigContext configCtx = this.getConfigContext();
        try {
            configBean = ServerBeansFactory.getConfigBean(configCtx);
        } catch (ConfigException ex) {}


        return configBean;

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    * Get the config element from domain.xml.
    * return null if not found
    */     
    private Config getConfigBeanDynamic() {
        Config configBean = null;
        ConfigContext configCtx = this.getConfigContextDynamic();
        try {
            configBean = ServerBeansFactory.getConfigBean(configCtx);
        } catch (ConfigException ex) {}


        return configBean;

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      ServerContext serverCtx = ApplicationServer.getServerContext();
      //this condition occurs during some unit tests
      if(serverCtx == null)
          return defaultValue;
      ConfigContext configCtx = serverCtx.getConfigContext();    
      ConfigBean configBean = null;
      String returnValueString = null;


      String returnValue = defaultValue;
      try {
          configBean =
              configCtx.exactLookup(xpath);
      } catch (ConfigException ex) {
      }      
      if(configBean != null) {
          returnValueString = configBean.getAttributeValue("value");
      }

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        if(_logger.isLoggable(Level.FINEST)) {
            _logger.finest("in getServerConfigValue:xpath=" + xpath
                + " defaultValue= " + defaultValue);
        }


        ConfigContext configCtx = this.getConfigContext();
        ConfigBean configBean = null;
        String returnValueString = null;


        int returnValue = defaultValue;
        try {
            configBean =
                configCtx.exactLookup(xpath);
        } catch (ConfigException ex) {
        }      
        if(configBean != null) {
            returnValueString = configBean.getAttributeValue("value");
        }

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