org.springframework.jndi.JndiTemplate Maven / Gradle / Ivy
/*
* Copyright 2002-2005 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.jndi;
import java.util.Properties;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* 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.
*
* This is the central class in this package. It performs all JNDI context handling.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @see JndiCallback
* @see #execute
*/
public class JndiTemplate {
protected final Log logger = LogFactory.getLog(getClass());
private Properties environment;
/**
* Create a new JndiTemplate instance.
*/
public JndiTemplate() {
}
/**
* Create a new JndiTemplate instance, using the given environment.
*/
public JndiTemplate(Properties environment) {
this.environment = environment;
}
/**
* Set the environment for the JNDI InitialContext.
*/
public void setEnvironment(Properties environment) {
this.environment = environment;
}
/**
* Return the environment for the JNDI InitialContext.
*/
public Properties getEnvironment() {
return environment;
}
/**
* Execute the given JNDI context callback implementation.
* @param contextCallback JndiCallback implementation
* @return a result object returned by the callback, or null
* @throws NamingException thrown by the callback implementation
* @see #createInitialContext
*/
public Object execute(JndiCallback contextCallback) throws NamingException {
Context ctx = createInitialContext();
try {
return contextCallback.doInContext(ctx);
}
finally {
try {
ctx.close();
}
catch (NamingException ex) {
logger.warn("Could not close JNDI InitialContext", ex);
}
}
}
/**
* Create a new JNDI initial context. Invoked by execute.
* The default implementation use this template's environment settings.
* Can be subclassed for custom contexts, e.g. for testing.
* @return the initial Context instance
* @throws NamingException in case of initialization errors
*/
protected Context createInitialContext() throws NamingException {
return new InitialContext(getEnvironment());
}
/**
* Look up the object with the given name in the current JNDI context.
* @param name the JNDI name of the object
* @return 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
*/
public Object lookup(final String name) throws NamingException {
if (logger.isInfoEnabled()) {
logger.debug("Looking up JNDI object with name [" + name + "]");
}
return execute(new JndiCallback() {
public Object doInContext(Context ctx) throws NamingException {
Object located = ctx.lookup(name);
if (located == null) {
throw new NamingException(
"JNDI object with [" + name + "] not found: JNDI implementation returned null");
}
return located;
}
});
}
/**
* Look up the object with the given name in the current JNDI context.
* @param name the JNDI name of the object
* @param 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.
* @return 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
*/
public Object lookup(String name, Class requiredType) throws NamingException {
Object jndiObject = lookup(name);
if (requiredType != null && !requiredType.isInstance(jndiObject)) {
throw new NamingException(
"Object [" + jndiObject + "] available at JNDI location [" +
name + "] does not implement [" + requiredType.getName() + "]");
}
return jndiObject;
}
/**
* Bind the given object to the current JNDI context, using the given name.
* @param name the JNDI name of the object
* @param object the object to bind
* @throws NamingException thrown by JNDI, mostly name already bound
*/
public void bind(final String name, final Object object) throws NamingException {
if (logger.isInfoEnabled()) {
logger.info("Binding JNDI object with name [" + name + "]");
}
execute(new JndiCallback() {
public Object doInContext(Context ctx) throws NamingException {
ctx.bind(name, object);
return null;
}
});
}
/**
* Rebind the given object to the current JNDI context, using the given name.
* Overwrites any existing binding.
* @param name the JNDI name of the object
* @param object the object to rebind
* @throws NamingException thrown by JNDI
*/
public void rebind(final String name, final Object object) throws NamingException {
if (logger.isInfoEnabled()) {
logger.info("Rebinding JNDI object with name [" + name + "]");
}
execute(new JndiCallback() {
public Object doInContext(Context ctx) throws NamingException {
ctx.rebind(name, object);
return null;
}
});
}
/**
* Remove the binding for the given name from the current JNDI context.
* @param name the JNDI name of the object
* @throws NamingException thrown by JNDI, mostly name not found
*/
public void unbind(final String name) throws NamingException {
if (logger.isInfoEnabled()) {
logger.info("Unbinding JNDI object with name [" + name + "]");
}
execute(new JndiCallback() {
public Object doInContext(Context ctx) throws NamingException {
ctx.unbind(name);
return null;
}
});
}
}