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/*
 * Copyright 2002-2018 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 java.util.Hashtable;
import java.util.Properties;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NameNotFoundException;
import javax.naming.NamingException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.lang.Nullable;
import org.springframework.util.CollectionUtils;

/**
 * Helper class that simplifies JNDI operations. It provides methods to lookup and
 * bind objects, and allows implementations of the {@link JndiCallback} interface
 * to perform any operation they like with a JNDI naming context provided.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @see JndiCallback
 * @see #execute
 */
public class JndiTemplate {

	protected final Log logger = LogFactory.getLog(getClass());

	@Nullable
	private Properties environment;


	/**
	 * Create a new JndiTemplate instance.
	 */
	public JndiTemplate() {
	}

	/**
	 * Create a new JndiTemplate instance, using the given environment.
	 */
	public JndiTemplate(@Nullable Properties environment) {
		this.environment = environment;
	}


	/**
	 * Set the environment for the JNDI InitialContext.
	 */
	public void setEnvironment(@Nullable Properties environment) {
		this.environment = environment;
	}

	/**
	 * Return the environment for the JNDI InitialContext, if any.
	 */
	@Nullable
	public Properties getEnvironment() {
		return this.environment;
	}


	/**
	 * Execute the given JNDI context callback implementation.
	 * @param contextCallback the JndiCallback implementation to use
	 * @return a result object returned by the callback, or {@code null}
	 * @throws NamingException thrown by the callback implementation
	 * @see #createInitialContext
	 */
	@Nullable
	public  T execute(JndiCallback contextCallback) throws NamingException {
		Context ctx = getContext();
		try {
			return contextCallback.doInContext(ctx);
		}
		finally {
			releaseContext(ctx);
		}
	}

	/**
	 * Obtain a JNDI context corresponding to this template's configuration.
	 * Called by {@link #execute}; may also be called directly.
	 * 

The default implementation delegates to {@link #createInitialContext()}. * @return the JNDI context (never {@code null}) * @throws NamingException if context retrieval failed * @see #releaseContext */ public Context getContext() throws NamingException { return createInitialContext(); } /** * Release a JNDI context as obtained from {@link #getContext()}. * @param ctx the JNDI context to release (may be {@code null}) * @see #getContext */ public void releaseContext(@Nullable Context ctx) { if (ctx != null) { try { ctx.close(); } catch (NamingException ex) { logger.debug("Could not close JNDI InitialContext", ex); } } } /** * Create a new JNDI initial context. Invoked by {@link #getContext}. *

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 { Hashtable icEnv = null; Properties env = getEnvironment(); if (env != null) { icEnv = new Hashtable<>(env.size()); CollectionUtils.mergePropertiesIntoMap(env, icEnv); } return new InitialContext(icEnv); } /** * 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 {@code 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.isDebugEnabled()) { logger.debug("Looking up JNDI object with name [" + name + "]"); } Object result = execute(ctx -> ctx.lookup(name)); if (result == null) { throw new NameNotFoundException( "JNDI object with [" + name + "] not found: JNDI implementation returned null"); } return result; } /** * 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 {@code null} for any match. For example, * if the value is {@code Object.class}, this method will succeed whatever * the class of the returned instance. * @return object found (cannot be {@code 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 */ @SuppressWarnings("unchecked") public T lookup(String name, @Nullable Class requiredType) throws NamingException { Object jndiObject = lookup(name); if (requiredType != null && !requiredType.isInstance(jndiObject)) { throw new TypeMismatchNamingException(name, requiredType, jndiObject.getClass()); } return (T) 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.isDebugEnabled()) { logger.debug("Binding JNDI object with name [" + name + "]"); } execute(ctx -> { 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.isDebugEnabled()) { logger.debug("Rebinding JNDI object with name [" + name + "]"); } execute(ctx -> { 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.isDebugEnabled()) { logger.debug("Unbinding JNDI object with name [" + name + "]"); } execute(ctx -> { ctx.unbind(name); return null; }); } }





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