001 // Copyright 2004, 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.hivemind.service.impl; 016 017 import java.util.HashMap; 018 import java.util.Map; 019 020 import org.apache.hivemind.Location; 021 import org.apache.hivemind.ServiceImplementationFactoryParameters; 022 import org.apache.hivemind.internal.Module; 023 import org.apache.hivemind.schema.Translator; 024 import org.apache.hivemind.util.ConstructorUtils; 025 026 /** 027 * Implementation of {@link org.apache.hivemind.service.impl.BuilderFacet} that stores a value. This 028 * corresponds to the <set> type elements and all constructor parameter elements. The value is 029 * not resolved until needed using a specified {@link Translator}. 030 * 031 * @author Howard Lewis Ship 032 */ 033 public class BuilderPropertyFacet extends BuilderFacet 034 { 035 private String _translatorName; 036 037 private String _literalValue; 038 039 /** 040 * Cache for translated values to prevent calling 041 * {@link Translator#translate(Module, Class, String, Location)} twice. 042 */ 043 private Map _valuesCache = new HashMap(); 044 045 public Object getFacetValue(ServiceImplementationFactoryParameters factoryParameters, 046 Class targetType) 047 { 048 Object result = _valuesCache.get(targetType); 049 050 if (result == null) 051 { 052 Translator translator = factoryParameters.getInvokingModule().getTranslator( 053 _translatorName); 054 055 result = translator.translate( 056 factoryParameters.getInvokingModule(), 057 targetType, 058 _literalValue, 059 getLocation()); 060 061 _valuesCache.put(targetType, result); 062 } 063 064 return result; 065 } 066 067 public boolean isAssignableToType(ServiceImplementationFactoryParameters factoryParameters, 068 Class targetType) 069 { 070 // TODO should Translator declare an analoguous isAssignableToType method? 071 Object facetValue = getFacetValue(factoryParameters, targetType); 072 073 if (facetValue == null) 074 return !targetType.isPrimitive(); 075 076 return ConstructorUtils.isCompatible(targetType, facetValue.getClass()); 077 } 078 079 /** @since 1.1 */ 080 public void setTranslator(String translatorName) 081 { 082 _translatorName = translatorName; 083 } 084 085 public void setValue(String value) 086 { 087 _literalValue = value; 088 } 089 090 }