001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.shiro.jndi;
020
021import org.apache.shiro.lang.util.Factory;
022
023import javax.naming.NamingException;
024
025/**
026 * A factory implementation intended to be used to look up objects in jndi.
027 *
028 * @param <T>
029 * @since 1.2
030 */
031public class JndiObjectFactory<T> extends JndiLocator implements Factory<T> {
032
033    private String resourceName;
034    private Class<? extends T> requiredType;
035
036    @SuppressWarnings("unchecked")
037    public T getInstance() {
038        try {
039            if (requiredType != null) {
040                return requiredType.cast(this.lookup(resourceName, requiredType));
041            } else {
042                return (T) this.lookup(resourceName);
043            }
044        } catch (NamingException e) {
045            final String typeName = requiredType != null ? requiredType.getName() : "object";
046            throw new IllegalStateException("Unable to look up " + typeName + " with jndi name '" + resourceName + "'.", e);
047        }
048    }
049
050    public String getResourceName() {
051        return resourceName;
052    }
053
054    public void setResourceName(String resourceName) {
055        this.resourceName = resourceName;
056    }
057
058    public Class<? extends T> getRequiredType() {
059        return requiredType;
060    }
061
062    public void setRequiredType(Class<? extends T> requiredType) {
063        this.requiredType = requiredType;
064    }
065}