001 // Copyright 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.tapestry.annotations; 016 017 import java.lang.reflect.Method; 018 019 import org.apache.hivemind.ApplicationRuntimeException; 020 import org.apache.hivemind.HiveMind; 021 import org.apache.hivemind.Location; 022 import org.apache.tapestry.enhance.EnhancementOperation; 023 import org.apache.tapestry.spec.BindingSpecification; 024 import org.apache.tapestry.spec.BindingType; 025 import org.apache.tapestry.spec.ContainedComponent; 026 import org.apache.tapestry.spec.IBindingSpecification; 027 import org.apache.tapestry.spec.IComponentSpecification; 028 import org.apache.tapestry.spec.IContainedComponent; 029 030 /** 031 * Adds a {@link org.apache.tapestry.spec.IContainedComponent} to the 032 * {@link org.apache.tapestry.spec.IComponentSpecification}. 033 * 034 * @author Howard Lewis Ship 035 * @since 4.0 036 * @see Component 037 */ 038 public class ComponentAnnotationWorker implements MethodAnnotationEnhancementWorker 039 { 040 041 public void performEnhancement(EnhancementOperation op, IComponentSpecification spec, 042 Method method, Location location) 043 { 044 Component component = method.getAnnotation(Component.class); 045 046 String propertyName = AnnotationUtils.getPropertyName(method); 047 String type = component.type(); 048 String copyOf = component.copyOf(); 049 boolean hasCopyOf = HiveMind.isNonBlank(copyOf); 050 051 if (hasCopyOf) 052 { 053 if (HiveMind.isNonBlank(type)) 054 throw new ApplicationRuntimeException(AnnotationMessages.bothTypeAndCopyOf(propertyName)); 055 type = null; 056 } 057 else 058 { 059 if (type.equals("")) 060 { 061 Class retTypeClazz = method.getReturnType(); 062 type = resolveComponentType(retTypeClazz); 063 } 064 copyOf = null; 065 } 066 067 IContainedComponent cc = new ContainedComponent(); 068 069 cc.setInheritInformalParameters(component.inheritInformalParameters()); 070 cc.setType(type); 071 cc.setCopyOf(copyOf); 072 cc.setPropertyName(propertyName); 073 cc.setLocation(location); 074 075 for (String binding : component.bindings()) 076 { 077 addBinding(cc, binding, location); 078 } 079 080 String id = component.id(); 081 082 if (id.equals("")) 083 id = propertyName; 084 085 spec.addComponent(id, cc); 086 087 if (hasCopyOf) 088 { 089 IContainedComponent source = spec.getComponent(copyOf); 090 if (source != null) 091 AnnotationUtils.copyBindings(source, cc); 092 } 093 } 094 095 protected String resolveComponentType(Class retTypeClass) 096 { 097 return retTypeClass.getSimpleName(); 098 } 099 100 void addBinding(IContainedComponent component, String binding, Location location) 101 { 102 int equalsx = binding.indexOf('='); 103 104 if (equalsx < 1) 105 invalidBinding(binding); 106 107 if (equalsx + 1 >= binding.length()) 108 invalidBinding(binding); 109 110 String name = binding.substring(0, equalsx).trim(); 111 String value = binding.substring(equalsx + 1).trim(); 112 113 IBindingSpecification bs = new BindingSpecification(); 114 bs.setType(BindingType.PREFIXED); 115 bs.setValue(value); 116 bs.setLocation(location); 117 118 component.setBinding(name, bs); 119 } 120 121 protected void invalidBinding(String binding) 122 { 123 throw new ApplicationRuntimeException(AnnotationMessages.bindingWrongFormat(binding)); 124 } 125 }