org.springframework.jndi
Class JndiTemplate

java.lang.Object
  org.springframework.jndi.JndiTemplate

Direct Known Subclasses:

ExpectedLookupTemplate

public class JndiTemplate
extends Object

Helper class that simplifies JNDI operations. It provides methods to lookup and bind objects, and allows implementations of the JndiCallback interface to perform any operation they like with a JNDI naming context provided.

Author:

Rod Johnson, Juergen Hoeller

See Also:

JndiCallback, execute(org.springframework.jndi.JndiCallback)

Field Summary

protected Log

logger

Constructor Summary

JndiTemplate()
Create a new JndiTemplate instance.

JndiTemplate(Properties environment)
Create a new JndiTemplate instance, using the given environment.

Method Summary

void	bind(String name, Object object) Bind the given object to the current JNDI context, using the given name.
protected Context	createInitialContext() Create a new JNDI initial context.
<T> T	execute(JndiCallback<T> contextCallback) Execute the given JNDI context callback implementation.
Context	getContext() Obtain a JNDI context corresponding to this template's configuration.
Properties	getEnvironment() Return the environment for the JNDI InitialContext, if any.
Object	lookup(String name) Look up the object with the given name in the current JNDI context.
<T> T	lookup(String name, Class<T> requiredType) Look up the object with the given name in the current JNDI context.
void	rebind(String name, Object object) Rebind the given object to the current JNDI context, using the given name.
void	releaseContext(Context ctx) Release a JNDI context as obtained from getContext().
void	setEnvironment(Properties environment) Set the environment for the JNDI InitialContext.
void	unbind(String name) Remove the binding for the given name from the current JNDI context.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

logger

protected final Log logger

Constructor Detail

JndiTemplate

public JndiTemplate()

Create a new JndiTemplate instance.

JndiTemplate

public JndiTemplate(Properties environment)

Create a new JndiTemplate instance, using the given environment.

Method Detail

setEnvironment

public void setEnvironment(Properties environment)

Set the environment for the JNDI InitialContext.

getEnvironment

public Properties getEnvironment()

Return the environment for the JNDI InitialContext, if any.

execute

public <T> T execute(JndiCallback<T> contextCallback)
          throws NamingException

Execute the given JNDI context callback implementation.

Parameters:

contextCallback - JndiCallback implementation

Returns:

a result object returned by the callback, or null

Throws:

NamingException - thrown by the callback implementation

See Also:

createInitialContext()

getContext

public Context getContext()
                   throws NamingException

Obtain a JNDI context corresponding to this template's configuration. Called by execute(org.springframework.jndi.JndiCallback); may also be called directly.

The default implementation delegates to createInitialContext().

Returns:

the JNDI context (never null)

Throws:

NamingException - if context retrieval failed

See Also:

releaseContext(javax.naming.Context)

releaseContext

public void releaseContext(Context ctx)

Release a JNDI context as obtained from getContext().

Parameters:

ctx - the JNDI context to release (may be null)

See Also:

getContext()

createInitialContext

protected Context createInitialContext()
                                throws NamingException

Create a new JNDI initial context. Invoked by getContext().

The default implementation use this template's environment settings. Can be subclassed for custom contexts, e.g. for testing.

Returns:

the initial Context instance

Throws:

NamingException - in case of initialization errors

lookup

public Object lookup(String name)
              throws NamingException

Look up the object with the given name in the current JNDI context.

Parameters:

name - the JNDI name of the object

Returns:

object found (cannot be null; if a not so well-behaved JNDI implementations returns null, a NamingException gets thrown)

Throws:

NamingException - if there is no object with the given name bound to JNDI

lookup

public <T> T lookup(String name,
                    Class<T> requiredType)
         throws NamingException

Look up the object with the given name in the current JNDI context.

Parameters:

name - the JNDI name of the object

requiredType - type the JNDI object must match. Can be an interface or superclass of the actual class, or null for any match. For example, if the value is Object.class, this method will succeed whatever the class of the returned instance.

Returns:

object found (cannot be null; if a not so well-behaved JNDI implementations returns null, a NamingException gets thrown)

Throws:

NamingException - if there is no object with the given name bound to JNDI

bind

public void bind(String name,
                 Object object)
          throws NamingException

Bind the given object to the current JNDI context, using the given name.

Parameters:

name - the JNDI name of the object

object - the object to bind

Throws:

NamingException - thrown by JNDI, mostly name already bound

rebind

public void rebind(String name,
                   Object object)
            throws NamingException

Rebind the given object to the current JNDI context, using the given name. Overwrites any existing binding.

Parameters:

name - the JNDI name of the object

object - the object to rebind

Throws:

NamingException - thrown by JNDI

unbind

public void unbind(String name)
            throws NamingException

Remove the binding for the given name from the current JNDI context.

Parameters:

name - the JNDI name of the object

Throws:

NamingException - thrown by JNDI, mostly name not found