1 /** 2 * This file Copyright (c) 2011-2014 Magnolia International 3 * Ltd. (http://www.magnolia-cms.com). All rights reserved. 4 * 5 * 6 * This file is dual-licensed under both the Magnolia 7 * Network Agreement and the GNU General Public License. 8 * You may elect to use one or the other of these licenses. 9 * 10 * This file is distributed in the hope that it will be 11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the 12 * implied warranty of MERCHANTABILITY or FITNESS FOR A 13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT. 14 * Redistribution, except as permitted by whichever of the GPL 15 * or MNA you select, is prohibited. 16 * 17 * 1. For the GPL license (GPL), you can redistribute and/or 18 * modify this file under the terms of the GNU General 19 * Public License, Version 3, as published by the Free Software 20 * Foundation. You should have received a copy of the GNU 21 * General Public License, Version 3 along with this program; 22 * if not, write to the Free Software Foundation, Inc., 51 23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 24 * 25 * 2. For the Magnolia Network Agreement (MNA), this file 26 * and the accompanying materials are made available under the 27 * terms of the MNA which accompanies this distribution, and 28 * is available at http://www.magnolia-cms.com/mna.html 29 * 30 * Any modifications to this file must keep this entire header 31 * intact. 32 * 33 */ 34 package info.magnolia.objectfactory; 35 36 import java.lang.reflect.ParameterizedType; 37 import java.lang.reflect.Type; 38 import javax.inject.Provider; 39 40 /** 41 * Parameter resolver which looks for suitable parameters in a set of candidates. Cannot handle null values since its 42 * unable to match them to a type. Will create javax.inject.Provider instances that match the parameter's type. 43 */ 44 public class CandidateParameterResolver implements ParameterResolver { 45 46 private final Object[] candidates; 47 48 public CandidateParameterResolver(Object[] candidates) { 49 this.candidates = candidates; 50 } 51 52 @Override 53 public Object resolveParameter(ParameterInfo parameter) { 54 55 Type genericParameterType = parameter.getGenericParameterType(); 56 Class<?> parameterType = parameter.getParameterType(); 57 58 // If the parameter is javax.inject.Provider<T> we will look for T instead and return a provider for it 59 if (genericParameterType instanceof ParameterizedType) { 60 ParameterizedType parameterizedType = (ParameterizedType) genericParameterType; 61 if (parameterizedType.getRawType() == javax.inject.Provider.class) { 62 Class<?> actualType = (Class<?>) parameterizedType.getActualTypeArguments()[0]; 63 for (final Object extraCandidate : candidates) { 64 if (actualType.isAssignableFrom(extraCandidate.getClass())) { 65 return new Provider() { 66 @Override 67 public Object get() { 68 return extraCandidate; 69 } 70 }; 71 } 72 } 73 return UNRESOLVED; 74 } 75 } 76 for (Object extraCandidate : candidates) { 77 if (parameterType.isAssignableFrom(extraCandidate.getClass())) { 78 return extraCandidate; 79 } 80 } 81 return UNRESOLVED; 82 } 83 }