001package org.eclipse.aether.internal.impl.synccontext.named; 002 003/* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022import org.eclipse.aether.named.NamedLockFactory; 023 024import java.util.Map; 025 026/** 027 * Selector implementation support class: by extending this class one may override defaults, or provide completely 028 * alternative way of configuration. This implementation uses Java System properties to select factory and name mapper. 029 * 030 * @since 1.7.3 031 */ 032public abstract class NamedLockFactorySelectorSupport 033 implements NamedLockFactorySelector 034{ 035 public static final String FACTORY_KEY = "aether.syncContext.named.factory"; 036 037 public static final String NAME_MAPPER_KEY = "aether.syncContext.named.nameMapper"; 038 039 private final NamedLockFactory namedLockFactory; 040 041 private final NameMapper nameMapper; 042 043 public NamedLockFactorySelectorSupport( final Map<String, NamedLockFactory> factories, 044 final String defaultFactoryName, 045 final Map<String, NameMapper> nameMappers, 046 final String defaultNameMapperName ) 047 { 048 this.namedLockFactory = selectNamedLockFactory( factories, getFactoryName( defaultFactoryName ) ); 049 this.nameMapper = selectNameMapper( nameMappers, getNameMapperName( defaultNameMapperName ) ); 050 } 051 052 /** 053 * Returns the selected {@link NamedLockFactory}, never null. 054 */ 055 @Override 056 public NamedLockFactory getSelectedNamedLockFactory() 057 { 058 return namedLockFactory; 059 } 060 061 /** 062 * Returns the selected {@link NameMapper}, never null. 063 */ 064 @Override 065 public NameMapper getSelectedNameMapper() 066 { 067 return nameMapper; 068 } 069 070 /** 071 * Returns selected factory name (or passed in default) using System property value of {@link #FACTORY_KEY}. 072 */ 073 protected String getFactoryName( final String defaultFactoryName ) 074 { 075 return System.getProperty( FACTORY_KEY, defaultFactoryName ); 076 } 077 078 /** 079 * Returns selected name mapper name (or passed in default) using System property value of {@link #NAME_MAPPER_KEY}. 080 */ 081 protected String getNameMapperName( final String defaultNameMapperName ) 082 { 083 return System.getProperty( NAME_MAPPER_KEY, defaultNameMapperName ); 084 } 085 086 private NamedLockFactory selectNamedLockFactory( final Map<String, NamedLockFactory> factories, 087 final String factoryName ) 088 { 089 NamedLockFactory factory = factories.get( factoryName ); 090 if ( factory == null ) 091 { 092 throw new IllegalArgumentException( "Unknown NamedLockFactory name: " + factoryName 093 + ", known ones: " + factories.keySet() ); 094 } 095 return factory; 096 } 097 098 private NameMapper selectNameMapper( final Map<String, NameMapper> nameMappers, 099 final String mapperName ) 100 { 101 NameMapper nameMapper = nameMappers.get( mapperName ); 102 if ( nameMapper == null ) 103 { 104 throw new IllegalArgumentException( "Unknown NameMapper name: " + mapperName 105 + ", known ones: " + nameMappers.keySet() ); 106 } 107 return nameMapper; 108 } 109}