1 /** 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 */ 19 package org.apache.creadur.whisker.app.load; 20 21 import java.io.File; 22 23 import org.apache.creadur.whisker.app.StreamableResource; 24 25 /** 26 * Conveniently builds {@link StreamableResource} implementations. 27 */ 28 public final class StreamableResourceFactory { 29 30 /** 31 * Builds instance that streams, on demand, 32 * from resource on the class path. 33 * @param name full name, including path, of the resource not null 34 * @return an instance that streams, on demand, the given resource, 35 * not null 36 */ 37 public StreamableResource streamFromClassPathResource(final String name) { 38 return new StreamableClassPathResource(name); 39 } 40 41 /** 42 * Builds instance that streams, on demand, 43 * from resource stored in the file system. 44 * @param fileName full name, including path, of the resource not null 45 * @return an instance that streams, on demand, the given resource, 46 * not null 47 */ 48 public StreamableResource streamFromFileResource(final String fileName) { 49 return new StreamableFileNameResource(fileName); 50 } 51 52 /** 53 * Builds instance that streams, on demand, 54 * from resource stored in the file system. 55 * @param file a file storing the resource not null 56 * @return an instance that streams, on demand, the given resource, 57 * not null 58 */ 59 public StreamableResource streamFromFileResource(final File file) { 60 return new StreamableFileResource(file); 61 } 62 63 /** 64 * When the resource is found on the classpath, 65 * builds an instance that streams, on demand, 66 * from the classpath. Otherwise, builds an 67 * instances that streams from the file system. 68 * @param resourceName source stream name. 69 * @return not null 70 */ 71 public StreamableResource streamFromResource(final String resourceName) { 72 final StreamableClassPathResource streamFromClasspath = 73 new StreamableClassPathResource(resourceName); 74 if (streamFromClasspath.exists()) { 75 return streamFromClasspath; 76 } 77 return streamFromFileResource(resourceName); 78 } 79 }