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Java example source code file (JndiIntegration.java)

This example Java source code file (JndiIntegration.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

class, context, inject, jndiintegration, jndiprovider, naming, namingexception, runtimeexception, string

The JndiIntegration.java Java example source code

/**
 * Copyright (C) 2006 Google Inc.
 *
 * 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 com.google.inject.jndi;

import com.google.inject.Inject;
import com.google.inject.Provider;

import javax.naming.Context;
import javax.naming.NamingException;

/**
 * Integrates Guice with JNDI. Requires a binding to 
 * {@link javax.naming.Context}.
 *
 * @author crazybob@google.com (Bob Lee)
 */
public class JndiIntegration {

  private JndiIntegration() {}

  /**
   * Creates a provider which looks up objects in JNDI using the given name.
   * Example usage:
   *
   * <pre>
   * bind(DataSource.class).toProvider(fromJndi(DataSource.class, "java:..."));
   * </pre>
   */
  public static <T> Provider fromJndi(Class type, String name) {
    return new JndiProvider<T>(type, name);
  }

  static class JndiProvider<T> implements Provider {

    @Inject Context context;
    final Class<T> type;
    final String name;

    public JndiProvider(Class<T> type, String name) {
      this.type = type;
      this.name = name;
    }

    public T get() {
      try {
        return type.cast(context.lookup(name));
      }
      catch (NamingException e) {
        throw new RuntimeException(e);
      }
    }
  }
}

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