/*
* Copyright 2002-2010 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 javax.naming.NamingException;
import org.springframework.util.Assert;
/**
* Convenient superclass for classes that can locate any number of JNDI objects.
* Derives from JndiAccessor to inherit the "jndiTemplate" and "jndiEnvironment"
* bean properties.
*
* <p>JNDI names may or may not include the "java:comp/env/" prefix expected
* by J2EE applications when accessing a locally mapped (ENC - Environmental
* Naming Context) resource. If it doesn't, the "java:comp/env/" prefix will
* be prepended if the "resourceRef" property is true (the default is
* <strong>false</strong>) and no other scheme (e.g. "java:") is given.
*
* @author Juergen Hoeller
* @since 1.1
* @see #setJndiTemplate
* @see #setJndiEnvironment
* @see #setResourceRef
*/
public abstract class JndiLocatorSupport extends JndiAccessor {
/** JNDI prefix used in a J2EE container */
public static final String CONTAINER_PREFIX = "java:comp/env/";
private boolean resourceRef = false;
/**
* Set whether the lookup occurs in a J2EE container, i.e. if the prefix
* "java:comp/env/" needs to be added if the JNDI name doesn't already
* contain it. Default is "false".
* <p>Note: Will only get applied if no other scheme (e.g. "java:") is given.
*/
public void setResourceRef(boolean resourceRef) {
this.resourceRef = resourceRef;
}
/**
* Return whether the lookup occurs in a J2EE container.
*/
public boolean isResourceRef() {
return this.resourceRef;
}
/**
* Perform an actual JNDI lookup for the given name via the JndiTemplate.
* <p>If the name doesn't begin with "java:comp/env/", this prefix is added
* if "resourceRef" is set to "true".
* @param jndiName the JNDI name to look up
* @return the obtained object
* @throws NamingException if the JNDI lookup failed
* @see #setResourceRef
*/
protected Object lookup(String jndiName) throws NamingException {
return lookup(jndiName, null);
}
/**
* Perform an actual JNDI lookup for the given name via the JndiTemplate.
* <p>If the name doesn't begin with "java:comp/env/", this prefix is added
* if "resourceRef" is set to "true".
* @param jndiName the JNDI name to look up
* @param requiredType the required type of the object
* @return the obtained object
* @throws NamingException if the JNDI lookup failed
* @see #setResourceRef
*/
protected <T> T lookup(String jndiName, Class<T> requiredType) throws NamingException {
Assert.notNull(jndiName, "'jndiName' must not be null");
String convertedName = convertJndiName(jndiName);
T jndiObject;
try {
jndiObject = getJndiTemplate().lookup(convertedName, requiredType);
}
catch (NamingException ex) {
if (!convertedName.equals(jndiName)) {
// Try fallback to originally specified name...
if (logger.isDebugEnabled()) {
logger.debug("Converted JNDI name [" + convertedName +
"] not found - trying original name [" + jndiName + "]. " + ex);
}
jndiObject = getJndiTemplate().lookup(jndiName, requiredType);
}
else {
throw ex;
}
}
if (logger.isDebugEnabled()) {
logger.debug("Located object with JNDI name [" + convertedName + "]");
}
return jndiObject;
}
/**
* Convert the given JNDI name into the actual JNDI name to use.
* <p>The default implementation applies the "java:comp/env/" prefix if
* "resourceRef" is "true" and no other scheme (e.g. "java:") is given.
* @param jndiName the original JNDI name
* @return the JNDI name to use
* @see #CONTAINER_PREFIX
* @see #setResourceRef
*/
protected String convertJndiName(String jndiName) {
// Prepend container prefix if not already specified and no other scheme given.
if (isResourceRef() && !jndiName.startsWith(CONTAINER_PREFIX) && jndiName.indexOf(':') == -1) {
jndiName = CONTAINER_PREFIX + jndiName;
}
return jndiName;
}
}
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