001    /**
002     Licensed to the Apache Software Foundation (ASF) under one or more
003     contributor license agreements.  See the NOTICE file distributed with
004     this work for additional information regarding copyright ownership.
005     The ASF licenses this file to You under the Apache License, Version 2.0
006     (the "License"); you may not use this file except in compliance with
007     the License.  You may obtain a copy of the License at
008    
009          http://www.apache.org/licenses/LICENSE-2.0
010    
011     Unless required by applicable law or agreed to in writing, software
012     distributed under the License is distributed on an "AS IS" BASIS,
013     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     See the License for the specific language governing permissions and
015     limitations under the License.
016    */
017    package org.apache.commons.inject.impl;
018    
019    import org.apache.commons.inject.api.IInjector;
020    import org.apache.commons.inject.api.IProvider;
021    
022    public abstract class AbstractScopedProvider<T> implements IProvider<T>, IInjectorAware {
023            private final IProvider<T> baseProvider;
024            private IInjector injector;
025            protected boolean initialized;
026    
027            public AbstractScopedProvider(IProvider<T> pBaseProvider) {
028                    baseProvider = pBaseProvider;
029            }
030            
031            protected IInjector getInjector() {
032                    if (injector == null) {
033                            throw new IllegalStateException("The Injector has not been initialized.");
034                    }
035                    return injector;
036            }
037    
038            @Override
039            public T get() {
040                    final T t = baseProvider.get(getInjector());
041                    return t;
042            }
043    
044            @Override
045            public Class<? extends T> getType() {
046                    return baseProvider.getType();
047            }
048    
049            @Override
050            public T get(IInjector pInjector) {
051                    return get();
052            }
053    
054            @Override
055            public void init(IInjector pInjector) {
056                    injector = pInjector;
057                    if (baseProvider instanceof IInjectorAware) {
058                            ((IInjectorAware) baseProvider).init(pInjector);
059                    }
060                    initialized = true;
061            }
062    }