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 */ 017package org.apache.commons.mail.resolver; 018 019import org.apache.commons.mail.DataSourceResolver; 020 021import javax.activation.DataSource; 022import java.io.IOException; 023 024/** 025 * A composite data source resolver. It allows to resolve data sources coming from 026 * multiple locations such as the classpath, the file system or an URL. 027 * 028 * @since 1.3 029 * @version $Id: DataSourceCompositeResolver.html 952467 2015-05-23 18:45:36Z tn $ 030 */ 031public class DataSourceCompositeResolver extends DataSourceBaseResolver 032{ 033 /** the list of resolvers */ 034 private final DataSourceResolver[] dataSourceResolvers; 035 036 /** 037 * Constructor. 038 * 039 * @param dataSourceResolvers a list of of resolvers being used 040 */ 041 public DataSourceCompositeResolver(final DataSourceResolver[] dataSourceResolvers) 042 { 043 this.dataSourceResolvers = new DataSourceResolver[dataSourceResolvers.length]; 044 System.arraycopy(dataSourceResolvers, 0, this.dataSourceResolvers, 0, dataSourceResolvers.length); 045 } 046 047 /** 048 * Constructor. 049 * 050 * @param dataSourceResolvers a list of of resolvers being used 051 * @param isLenient shall we ignore resources not found or throw an exception? 052 */ 053 public DataSourceCompositeResolver(final DataSourceResolver[] dataSourceResolvers, final boolean isLenient) 054 { 055 super(isLenient); 056 this.dataSourceResolvers = new DataSourceResolver[dataSourceResolvers.length]; 057 System.arraycopy(dataSourceResolvers, 0, this.dataSourceResolvers, 0, dataSourceResolvers.length); 058 } 059 060 /** 061 * Get the underlying data source resolvers. 062 * 063 * @return underlying data source resolvers 064 */ 065 public DataSourceResolver[] getDataSourceResolvers() 066 { 067 // clone the internal array to prevent external modification (see EMAIL-116) 068 final DataSourceResolver[] resolvers = new DataSourceResolver[dataSourceResolvers.length]; 069 System.arraycopy(dataSourceResolvers, 0, resolvers, 0, dataSourceResolvers.length); 070 return resolvers; 071 } 072 073 /** {@inheritDoc} */ 074 public DataSource resolve(final String resourceLocation) throws IOException 075 { 076 final DataSource result = resolve(resourceLocation, true); 077 078 if (isLenient() || result != null) 079 { 080 return result; 081 } 082 throw new IOException("The following resource was not found : " + resourceLocation); 083 084 } 085 086 /** {@inheritDoc} */ 087 public DataSource resolve(final String resourceLocation, final boolean isLenient) throws IOException 088 { 089 for (int i = 0; i < getDataSourceResolvers().length; i++) 090 { 091 final DataSourceResolver dataSourceResolver = getDataSourceResolvers()[i]; 092 final DataSource dataSource = dataSourceResolver.resolve(resourceLocation, isLenient); 093 094 if (dataSource != null) 095 { 096 return dataSource; 097 } 098 } 099 100 if (isLenient) 101 { 102 return null; 103 } 104 throw new IOException("The following resource was not found : " + resourceLocation); 105 } 106}