001/* 002 * Copyright 2014 Anyware Services 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016package org.ametys.plugins.explorer.resources.metadata.populate; 017 018import java.util.Collection; 019import java.util.HashMap; 020import java.util.HashSet; 021import java.util.Map; 022import java.util.Set; 023 024import org.ametys.runtime.plugin.component.AbstractThreadSafeComponentExtensionPoint; 025 026/** 027 * Extension point for {@link ResourceMetadataPopulator}s. 028 */ 029public class ResourceMetadataPopulatorExtensionPoint extends AbstractThreadSafeComponentExtensionPoint<ResourceMetadataPopulator> 030{ 031 /** Avalon Role */ 032 public static final String ROLE = ResourceMetadataPopulatorExtensionPoint.class.getName(); 033 034 private Map<String, Set<ResourceMetadataPopulator>> _types; 035 036 @Override 037 public void initializeExtensions() throws Exception 038 { 039 super.initializeExtensions(); 040 041 initializePopulatorMap(); 042 } 043 044 /** 045 * Initialize the populator map by type. 046 */ 047 protected void initializePopulatorMap() 048 { 049 _types = new HashMap<>(); 050 051 for (String id : getExtensionsIds()) 052 { 053 ResourceMetadataPopulator populator = getExtension(id); 054 055 if (populator.getTypes() == null || populator.getTypes().isEmpty()) 056 { 057 // Default: use this populator for all the file types. 058 addPopulator("", populator); 059 } 060 else 061 { 062 for (String type : populator.getTypes()) 063 { 064 addPopulator(type, populator); 065 } 066 } 067 } 068 } 069 070 /** 071 * Add the populator to the map. 072 * @param type the mime type or the empty string. 073 * @param populator the populator. 074 */ 075 protected void addPopulator(String type, ResourceMetadataPopulator populator) 076 { 077 Set<ResourceMetadataPopulator> types; 078 if (_types.containsKey(type)) 079 { 080 types = _types.get(type); 081 } 082 else 083 { 084 types = new HashSet<>(); 085 _types.put(type, types); 086 } 087 088 types.add(populator); 089 } 090 091 /** 092 * Returns the {@link ResourceMetadataPopulator}s corresponding to the given type. 093 * @param type the MIME type. 094 * @return a Collection of {@link ResourceMetadataPopulator}s, empty if there is no populator for the given type. 095 */ 096 public Collection<ResourceMetadataPopulator> getPopulators(String type) 097 { 098 Set<ResourceMetadataPopulator> populators = new HashSet<>(); 099 100 // Add default populators. 101 if (_types.containsKey("")) 102 { 103 populators.addAll(_types.get("")); 104 } 105 106 if (_types.containsKey(type)) 107 { 108 populators.addAll(_types.get(type)); 109 } 110 111 return populators; 112 } 113 114}