001/*
002 * The contents of this file are subject to the terms of the Common Development and
003 * Distribution License (the License). You may not use this file except in compliance with the
004 * License.
005 *
006 * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
007 * specific language governing permission and limitations under the License.
008 *
009 * When distributing Covered Software, include this CDDL Header Notice in each file and include
010 * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
011 * Header, with the fields enclosed by brackets [] replaced by your own identifying
012 * information: "Portions copyright [year] [name of copyright owner]".
013 *
014 * Copyright 2015-2016 ForgeRock AS.
015 */
016package org.forgerock.audit;
017
018import java.util.HashMap;
019import java.util.Map;
020
021/**
022 * Base DependencyProvider that has provides no dependencies.
023 */
024public class DependencyProviderBase implements DependencyProvider {
025
026    private final Map<Class<?>, Object> dependencies = new HashMap<>();
027
028    /**
029     * {@inheritDoc}
030     */
031    @SuppressWarnings("unchecked")
032    @Override
033    public <T> T getDependency(Class<T> clazz) throws ClassNotFoundException {
034        T dependency = (T) dependencies.get(clazz);
035        if (dependency == null) {
036            throw new ClassNotFoundException("No instance registered for class: " + clazz.getName());
037        } else {
038            return dependency;
039        }
040    }
041
042    /**
043     * Register a new provided dependency.
044     * @param <T> The type of the dependency.
045     * @param clazz the class to register
046     * @param obj the instance to provide
047     * @return the previous values registered for {@literal clazz}
048     */
049    public <T> T register(Class<T> clazz, T obj) {
050        return (T) dependencies.put(clazz, obj);
051    }
052}