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/*
* Copyright 2002-2016 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.InitialContext;
import javax.naming.NamingException;
import org.springframework.core.SpringProperties;
/**
* {@link JndiLocatorSupport} subclass with public lookup methods,
* for convenient use as a delegate.
*
* @author Juergen Hoeller
* @since 3.0.1
*/
public class JndiLocatorDelegate extends JndiLocatorSupport {
/**
* System property that instructs Spring to ignore a default JNDI environment, i.e.
* to always return {@code false} from {@link #isDefaultJndiEnvironmentAvailable()}.
* <p>The default is "false", allowing for regular default JNDI access e.g. in
* {@link JndiPropertySource}. Switching this flag to {@code true} is an optimization
* for scenarios where nothing is ever to be found for such JNDI fallback searches
* to begin with, avoiding the repeated JNDI lookup overhead.
* <p>Note that this flag just affects JNDI fallback searches, not explicitly configured
* JNDI lookups such as for a {@code DataSource} or some other environment resource.
* The flag literally just affects code which attempts JNDI searches based on the
* {@code JndiLocatorDelegate.isDefaultJndiEnvironmentAvailable()} check: in particular,
* {@code StandardServletEnvironment} and {@code StandardPortletEnvironment}.
* @since 4.3
* @see #isDefaultJndiEnvironmentAvailable()
* @see JndiPropertySource
*/
public static final String IGNORE_JNDI_PROPERTY_NAME = "spring.jndi.ignore";
private static final boolean shouldIgnoreDefaultJndiEnvironment =
SpringProperties.getFlag(IGNORE_JNDI_PROPERTY_NAME);
@Override
public Object lookup(String jndiName) throws NamingException {
return super.lookup(jndiName);
}
@Override
public <T> T lookup(String jndiName, Class<T> requiredType) throws NamingException {
return super.lookup(jndiName, requiredType);
}
/**
* Configure a {@code JndiLocatorDelegate} with its "resourceRef" property set to
* {@code true}, meaning that all names will be prefixed with "java:comp/env/".
* @see #setResourceRef
*/
public static JndiLocatorDelegate createDefaultResourceRefLocator() {
JndiLocatorDelegate jndiLocator = new JndiLocatorDelegate();
jndiLocator.setResourceRef(true);
return jndiLocator;
}
/**
* Check whether a default JNDI environment, as in a J2EE environment,
* is available on this JVM.
* @return {@code true} if a default InitialContext can be used,
* {@code false} if not
*/
public static boolean isDefaultJndiEnvironmentAvailable() {
if (shouldIgnoreDefaultJndiEnvironment) {
return false;
}
try {
new InitialContext().getEnvironment();
return true;
}
catch (Throwable ex) {
return false;
}
}
}
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