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.IPoint;
021    import org.apache.commons.inject.api.IProvider;
022    
023    /**
024     * Abstract implementation of a base provider: In general, bindings are using
025     * a {@link AbstractScopedProvider scoped provider}, which controls the bindings
026     * scope ({@code When} is the instance created?) The actual instantiation, and
027     * the injection of values, is delegated to the base provider. ({@code How} is
028     * the instance created?)
029     */
030    public abstract class AbstractBaseProvider<T> implements IProvider<T>, IInjectorAware {
031            private final Class<T> type;
032            private final IPoint<T> point;
033    
034            /**
035             * Creates a new base provider.
036             * @param pType The type of the instance, which is being created
037             * by the provider.
038             * @param pPoint The point, which is being used to inject values
039             * into the created instance.
040             */
041            protected AbstractBaseProvider(Class<T> pType, IPoint<T> pPoint) {
042                    type = pType;
043                    point = pPoint;
044            }
045    
046            @Override
047            public T get(IInjector pInjector) {
048                    final T t = get();
049                    point.injectTo(t, pInjector);
050                    return t;
051            }
052    
053            @Override
054            public Class<T> getType() {
055                    return type;
056            }
057    
058            @Override
059            public void init(IInjector pInjector) {
060                    if (point instanceof IInjectorAware) {
061                            ((IInjectorAware) point).init(pInjector);
062                    }
063            }
064    }