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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
 *
 *      https://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;
import org.springframework.lang.Nullable;

/**
 * {@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()}.
	 * 

The default is "false", allowing for regular default JNDI access, for example, 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. *

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 lookup(String jndiName, @Nullable Class 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 Jakarta EE 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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