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package com.sun.enterprise.deployapi.config;
import java.util.*;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import javax.enterprise.deploy.model.DDBean;
import javax.enterprise.deploy.model.XpathEvent;
import javax.enterprise.deploy.spi.DConfigBean;
import javax.enterprise.deploy.spi.DConfigBeanRoot;
import javax.enterprise.deploy.spi.exceptions.ConfigurationException;
import javax.enterprise.deploy.model.XpathListener;
import com.sun.enterprise.util.LocalStringManagerImpl;
/**
* Superclass for all the ConfigBeans. ConfigBeans are organized with
* a parent-child relationship. The parent defines xPaths and their
* mapping to child beans and return this mapping from the
* getXPathToBeanMapping method. Each bean is associated with a
* DOL descriptor (virtual field for this class) accessible through the
* getDescriptor() call.
*
* @author Jerome Dochez
*/
public abstract class SunConfigBean implements DConfigBean, XpathListener {
// Parent of this config bean. All config beans but root beans
// have a parent config bean
private SunConfigBean parent=null;
// DDBean associated with this config beans used to get the
// xpath this config beans is representing. We do not use
// the DDBean to extract the Standard DDs since it is initialized
// at the DConfigBeanRoot level
protected DDBean ddBean;
// propery change event support
protected PropertyChangeSupport propertyChange = new PropertyChangeSupport(this);
protected static final LocalStringManagerImpl localStrings =
new LocalStringManagerImpl(SunConfigBean.class);
/**
* Return the JavaBean containing the server-specific deployment
* configuration information based upon the XML data provided
* by the DDBean.
*
* @return The DConfigBean to display the server-specific properties
* for the standard bean.
* @param bean The DDBean containing the XML data to be
* evaluated.
* @throws ConfigurationException reports errors in generating
* a configuration bean. This DDBean is considered
* undeployable to this server until this exception
* is resolved.
* A suitably descriptive message is required so the user
* can diagnose the error.
*/
public DConfigBean getDConfigBean(DDBean bean)
throws ConfigurationException {
Map mapping = getXPathToBeanMapping();
if (mapping==null) {
return null;
}
if (mapping.containsKey(bean.getXpath())) {
Class c = (Class) mapping.get(bean.getXpath());
try {
Object o = c.newInstance();
if (o instanceof SunConfigBean) {
SunConfigBean child = (SunConfigBean) o;
child.setParent(this);
child.setDDBean(bean);
return child;
}
} catch(Exception e) {
e.printStackTrace();
throw new ConfigurationException(e.getMessage());
}
}
return null;
}
/**
* Return the JavaBean containing the deployment
* descriptor XML text associated with this DConfigBean.
* @return The bean class containing the XML text for
* this DConfigBean.
*/
public DDBean getDDBean() {
return ddBean;
}
/**
* we are being set a new DDBean, we need to reevaluate
* ourself.
*
* @param DDBean is the new standard DDBean container
*/
protected void setDDBean(DDBean ddBean) throws Exception {
this.ddBean = ddBean;
process();
}
/**
* A notification that the DDBean provided in the
* event has changed and this bean or its child beans need
* to reevaluate themselves.
*
* @param event an event containing a reference to the
* DDBean which has changed.
*/
public void notifyDDChange(XpathEvent xpathEvent) {
}
/**
* Remove a child DConfigBean from this bean.
*
* @param bean The child DConfigBean to be removed.
* @throws BeanNotFoundException the bean provided
* is not in the child list of this bean.
*/
public void removeDConfigBean(DConfigBean dConfigBean) throws javax.enterprise.deploy.spi.exceptions.BeanNotFoundException {
}
/**
* Register a property listener for this bean.
* @param pcl PropertyChangeListener to add
*/
public void addPropertyChangeListener(PropertyChangeListener propertyChangeListener) {
}
/**
* Unregister a property listener for this bean.
* @param pcl Listener to remove.
*/
public void removePropertyChangeListener(PropertyChangeListener propertyChangeListener) {
}
/**
* Notification of change from the standard DDBean
*
* @param the change event
*/
public void fireXpathEvent(XpathEvent xpe) {
if (getParent()!=null) {
getParent().fireXpathEvent(xpe);
return;
}
}
/**
* Return a list of XPaths designating the deployment descriptor
* information this DConfigBean requires.
*
* A given server vendor will need to specify some server-specific
* information. Each String returned by this method is an XPath
* describing a certain portion of the standard deployment descriptor
* for which there is corresponding server-specific configuration.
*
* @return a list of XPath Strings representing XML data to be retrieved
* or 'null' if there are none.
*/
public String[] getXpaths() {
Map mapping = getXPathToBeanMapping();
if (mapping==null) {
return null;
}
Set keys = mapping.keySet();
String[] xPaths = new String[keys.size()];
int i=0;
for (Iterator itr=keys.iterator(); itr.hasNext();) {
String s = (String) itr.next();
xPaths[i++]=s;
}
return xPaths;
}
/*
* set the parent config bean for this config bean
*/
protected void setParent(SunConfigBean parent) {
this.parent = parent;
}
/*
* @return the parent for this config bean
*/
public SunConfigBean getParent() {
return parent;
}
/**
* Convenience method extract node value from the passed xml fragment.
*
* @param key the xml tag name
* @param xml fragment to extract the tag value
* @return the xml tag value
*/
public static String extractTextFromXML(String key, String xmlFragment) {
// should we use a parser... seems heavy, we'll see if string parsing is enough
// pass opening tag
String openingTag = "<" + key + ">";
xmlFragment = xmlFragment.substring(xmlFragment.indexOf(openingTag)+openingTag.length());
return xmlFragment.substring(0, xmlFragment.indexOf("</" + key + ">"));
}
/**
* @return the mapping from xpaths to child config beans where
* the map keys are the xpaths and the values are the class object
* for the child config beans
*/
protected abstract Map getXPathToBeanMapping();
/**
* evaluate a standard bean
*/
protected abstract void process() throws Exception;
/**
* @return the associated DOL Descriptor for this config beans
*/
public abstract Object getDescriptor();
/**
* @return the ConfigBeanRoot for this config bean
*/
protected DConfigBeanRoot getDConfigBeanRoot() {
if (parent!=null) {
return parent.getDConfigBeanRoot();
}
return null;
}
/**
* @return a meaningful string about myself
*/
public String toString() {
String s = "DConfigBean";
s = s + "\nDConfigBeanRoot = " + getDConfigBeanRoot();
s = s + "\nParent = " + parent;
s = s + "\nXPath = " + ddBean.getXpath();
return s;
}
}
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