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.camel.spi; 018 019 /** 020 * A class resolver for loading classes in a loosly coupled manner to cater for different platforms such 021 * as standalone, web container, j2ee container and OSGi platforms. 022 */ 023 public interface ClassResolver { 024 025 /** 026 * Resolves the given class by its name 027 * 028 * @param name full qualified name of class 029 * @return the class if resolved, <tt>null</tt> if not found. 030 */ 031 Class resolveClass(String name); 032 033 /** 034 * Resolves the given class by its name 035 * 036 * @param name full qualified name of class 037 * @param type the expected type of the class 038 * @return the class if resolved, <tt>null</tt> if not found. 039 */ 040 <T> Class<T> resolveClass(String name, Class<T> type); 041 042 /** 043 * Resolves the given class by its name 044 * 045 * @param name full qualified name of class 046 * @param loader use the provided class loader 047 * @return the class if resolved, <tt>null</tt> if not found. 048 */ 049 Class resolveClass(String name, ClassLoader loader); 050 051 /** 052 * Resolves the given class by its name 053 * 054 * @param name full qualified name of class 055 * @param type the expected type of the class 056 * @param loader use the provided class loader 057 * @return the class if resolved, <tt>null</tt> if not found. 058 */ 059 <T> Class<T> resolveClass(String name, Class<T> type, ClassLoader loader); 060 061 /** 062 * Resolves the given class by its name 063 * 064 * @param name full qualified name of class 065 * @return the class if resolved, <tt>null</tt> if not found. 066 * @throws ClassNotFoundException is thrown if class not found 067 */ 068 Class resolveMandatoryClass(String name) throws ClassNotFoundException; 069 070 /** 071 * Resolves the given class by its name 072 * 073 * @param name full qualified name of class 074 * @param type the expected type of the class 075 * @return the class if resolved, <tt>null</tt> if not found. 076 * @throws ClassNotFoundException is thrown if class not found 077 */ 078 <T> Class<T> resolveMandatoryClass(String name, Class<T> type) throws ClassNotFoundException; 079 080 /** 081 * Resolves the given class by its name 082 * 083 * @param name full qualified name of class 084 * @return the class if resolved, <tt>null</tt> if not found. 085 * @param loader use the provided class loader 086 * @throws ClassNotFoundException is thrown if class not found 087 */ 088 Class resolveMandatoryClass(String name, ClassLoader loader) throws ClassNotFoundException; 089 090 /** 091 * Resolves the given class by its name 092 * 093 * @param name full qualified name of class 094 * @param type the expected type of the class 095 * @param loader use the provided class loader 096 * @return the class if resolved, <tt>null</tt> if not found. 097 * @throws ClassNotFoundException is thrown if class not found 098 */ 099 <T> Class<T> resolveMandatoryClass(String name, Class<T> type, ClassLoader loader) throws ClassNotFoundException; 100 101 }