A static utility class for common JNDI operations
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* Lesser General Public License for more details.
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*/
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.LinkRef;
import javax.naming.Name;
import javax.naming.NameNotFoundException;
import javax.naming.NamingException;
/**
* A static utility class for common JNDI operations.
*
* @author Scott.Stark@jboss.org
* @author adrian@jboss.com
* @version $Revision: 2787 $
*/
@SuppressWarnings("unchecked")
public class Util {
/**
* Create a subcontext including any intermediate contexts.
*
* @param ctx
* the parent JNDI Context under which value will be bound
* @param name
* the name relative to ctx of the subcontext.
* @return The new or existing JNDI subcontext
* @throws javax.naming.NamingException
* on any JNDI failure
*/
public static Context createSubcontext(Context ctx, String name) throws NamingException {
Name n = ctx.getNameParser("").parse(name);
return createSubcontext(ctx, n);
}
/**
* Create a subcontext including any intermediate contexts.
*
* @param ctx
* the parent JNDI Context under which value will be bound
* @param name
* the name relative to ctx of the subcontext.
* @return The new or existing JNDI subcontext
* @throws NamingException
* on any JNDI failure
*/
public static Context createSubcontext(Context ctx, Name name) throws NamingException {
Context subctx = ctx;
for (int pos = 0; pos < name.size(); pos++) {
String ctxName = name.get(pos);
try {
subctx = (Context) ctx.lookup(ctxName);
} catch (NameNotFoundException e) {
subctx = ctx.createSubcontext(ctxName);
}
// The current subctx will be the ctx for the next name component
ctx = subctx;
}
return subctx;
}
/**
* Bind val to name in ctx, and make sure that all intermediate contexts exist
*
* @param ctx
* the parent JNDI Context under which value will be bound
* @param name
* the name relative to ctx where value will be bound
* @param value
* the value to bind.
* @throws NamingException
* for any error
*/
public static void bind(Context ctx, String name, Object value) throws NamingException {
Name n = ctx.getNameParser("").parse(name);
bind(ctx, n, value);
}
/**
* Bind val to name in ctx, and make sure that all intermediate contexts exist
*
* @param ctx
* the parent JNDI Context under which value will be bound
* @param name
* the name relative to ctx where value will be bound
* @param value
* the value to bind.
* @throws NamingException
* for any error
*/
public static void bind(Context ctx, Name name, Object value) throws NamingException {
int size = name.size();
String atom = name.get(size - 1);
Context parentCtx = createSubcontext(ctx, name.getPrefix(size - 1));
parentCtx.bind(atom, value);
}
/**
* Rebind val to name in ctx, and make sure that all intermediate contexts
* exist
*
* @param ctx
* the parent JNDI Context under which value will be bound
* @param name
* the name relative to ctx where value will be bound
* @param value
* the value to bind.
* @throws NamingException
* for any error
*/
public static void rebind(Context ctx, String name, Object value) throws NamingException {
Name n = ctx.getNameParser("").parse(name);
rebind(ctx, n, value);
}
/**
* Rebind val to name in ctx, and make sure that all intermediate contexts
* exist
*
* @param ctx
* the parent JNDI Context under which value will be bound
* @param name
* the name relative to ctx where value will be bound
* @param value
* the value to bind.
* @throws NamingException
* for any error
*/
public static void rebind(Context ctx, Name name, Object value) throws NamingException {
int size = name.size();
String atom = name.get(size - 1);
Context parentCtx = createSubcontext(ctx, name.getPrefix(size - 1));
parentCtx.rebind(atom, value);
}
/**
* Unbinds a name from ctx, and removes parents if they are empty
*
* @param ctx
* the parent JNDI Context under which the name will be unbound
* @param name
* The name to unbind
* @throws NamingException
* for any error
*/
public static void unbind(Context ctx, String name) throws NamingException {
unbind(ctx, ctx.getNameParser("").parse(name));
}
/**
* Unbinds a name from ctx, and removes parents if they are empty
*
* @param ctx
* the parent JNDI Context under which the name will be unbound
* @param name
* The name to unbind
* @throws NamingException
* for any error
*/
public static void unbind(Context ctx, Name name) throws NamingException {
ctx.unbind(name); // unbind the end node in the name
int sz = name.size();
// walk the tree backwards, stopping at the domain
while (--sz > 0) {
Name pname = name.getPrefix(sz);
try {
ctx.destroySubcontext(pname);
} catch (NamingException e) {
System.out.println("Unable to remove context " + pname + e);
break;
}
}
}
/**
* Lookup an object in the default initial context
*
* @param name
* the name to lookup
* @param clazz
* the expected type
* @return the object
* @throws Exception
* for any error
*/
public static Object lookup(String name, Class<?> clazz) throws Exception {
InitialContext ctx = new InitialContext();
try {
return lookup(ctx, name, clazz);
} finally {
ctx.close();
}
}
/**
* Lookup an object in the default initial context
*
* @param name
* the name to lookup
* @param clazz
* the expected type
* @return the object
* @throws Exception
* for any error
*/
public static Object lookup(Name name, Class<?> clazz) throws Exception {
InitialContext ctx = new InitialContext();
try {
return lookup(ctx, name, clazz);
} finally {
ctx.close();
}
}
/**
* Lookup an object in the given context
*
* @param context
* the context
* @param name
* the name to lookup
* @param clazz
* the expected type
* @return the object
* @throws Exception
* for any error
*/
public static Object lookup(Context context, String name, Class clazz) throws Exception {
Object result = context.lookup(name);
checkObject(context, name, result, clazz);
return result;
}
/**
* Lookup an object in the given context
*
* @param context
* the context
* @param name
* the name to lookup
* @param clazz
* the expected type
* @return the object
* @throws Exception
* for any error
*/
public static Object lookup(Context context, Name name, Class clazz) throws Exception {
Object result = context.lookup(name);
checkObject(context, name.toString(), result, clazz);
return result;
}
/**
* Create a link
*
* @param fromName
* the from name
* @param toName
* the to name
* @throws NamingException
* for any error
*/
public static void createLinkRef(String fromName, String toName) throws NamingException {
InitialContext ctx = new InitialContext();
createLinkRef(ctx, fromName, toName);
}
/**
* Create a link
*
* @param ctx
* the context
* @param fromName
* the from name
* @param toName
* the to name
* @throws NamingException
* for any error
*/
public static void createLinkRef(Context ctx, String fromName, String toName)
throws NamingException {
LinkRef link = new LinkRef(toName);
Context fromCtx = ctx;
Name name = ctx.getNameParser("").parse(fromName);
String atom = name.get(name.size() - 1);
for (int n = 0; n < name.size() - 1; n++) {
String comp = name.get(n);
try {
fromCtx = (Context) fromCtx.lookup(comp);
} catch (NameNotFoundException e) {
fromCtx = fromCtx.createSubcontext(comp);
}
}
System.out.println("atom: " + atom);
System.out.println("link: " + link);
fromCtx.rebind(atom, link);
System.out.println("Bound link " + fromName + " to " + toName);
}
/**
* Remove the link ref
*
* @param name
* the name of the link binding
* @throws NamingException
* for any error
*/
public static void removeLinkRef(String name) throws NamingException {
InitialContext ctx = new InitialContext();
removeLinkRef(ctx, name);
}
/**
* Remove the link ref
*
* @param ctx
* the context
* @param name
* the name of the link binding
* @throws NamingException
* for any error
*/
public static void removeLinkRef(Context ctx, String name) throws NamingException {
System.out.println("Unbinding link " + name);
ctx.unbind(name);
}
/**
* Checks an object implements the given class
*
* @param context
* the context
* @param name
* the name to lookup
* @param object
* the object
* @param clazz
* the expected type
* @throws Exception
* for any error
*/
protected static void checkObject(Context context, String name, Object object, Class clazz)
throws Exception {
Class objectClass = object.getClass();
if (clazz.isAssignableFrom(objectClass) == false) {
StringBuffer buffer = new StringBuffer(100);
buffer.append("Object at '").append(name);
buffer.append("' in context ").append(context.getEnvironment());
buffer.append(" is not an instance of ");
appendClassInfo(buffer, clazz);
buffer.append(" object class is ");
appendClassInfo(buffer, object.getClass());
throw new ClassCastException(buffer.toString());
}
}
/**
* Append Class Info
*
* @param buffer
* the buffer to append to
* @param clazz
* the class to describe
*/
protected static void appendClassInfo(StringBuffer buffer, Class clazz) {
buffer.append("[class=").append(clazz.getName());
buffer.append(" classloader=").append(clazz.getClassLoader());
buffer.append(" interfaces={");
Class[] interfaces = clazz.getInterfaces();
for (int i = 0; i < interfaces.length; ++i) {
if (i > 0)
buffer.append(", ");
buffer.append("interface=").append(interfaces[i].getName());
buffer.append(" classloader=").append(interfaces[i].getClassLoader());
}
buffer.append("}]");
}
}
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