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 015package org.apache.tapestry.enhance; 016 017import java.lang.reflect.Modifier; 018import java.util.Iterator; 019 020import org.apache.hivemind.ApplicationRuntimeException; 021import org.apache.hivemind.ErrorLog; 022import org.apache.hivemind.Location; 023import org.apache.hivemind.service.MethodSignature; 024import org.apache.hivemind.util.Defense; 025import org.apache.tapestry.IAsset; 026import org.apache.tapestry.spec.IAssetSpecification; 027import org.apache.tapestry.spec.IComponentSpecification; 028 029/** 030 * Injects assets as component properties. 031 * 032 * @author Howard M. Lewis Ship 033 * @since 4.0 034 */ 035public class InjectAssetWorker implements EnhancementWorker 036{ 037 private ErrorLog _errorLog; 038 039 public void performEnhancement(EnhancementOperation op, IComponentSpecification spec) 040 { 041 Iterator i = spec.getAssetNames().iterator(); 042 while (i.hasNext()) 043 { 044 String name = (String) i.next(); 045 046 IAssetSpecification as = spec.getAsset(name); 047 048 String propertyName = as.getPropertyName(); 049 050 if (propertyName != null) 051 { 052 try 053 { 054 injectAsset(op, name, propertyName, as.getLocation()); 055 } 056 catch (Exception ex) 057 { 058 _errorLog.error(EnhanceMessages.errorAddingProperty(propertyName, op 059 .getBaseClass(), ex), as.getLocation(), ex); 060 } 061 } 062 } 063 } 064 065 public void injectAsset(EnhancementOperation op, String assetName, String propertyName, 066 Location location) 067 { 068 Defense.notNull(op, "op"); 069 Defense.notNull(assetName, "assetName"); 070 Defense.notNull(propertyName, "propertyName"); 071 072 Class propertyType = EnhanceUtils.extractPropertyType(op, propertyName, null); 073 074 op.claimReadonlyProperty(propertyName); 075 076 if (!propertyType.isAssignableFrom(IAsset.class)) 077 throw new ApplicationRuntimeException(EnhanceMessages.incompatiblePropertyType( 078 propertyName, 079 propertyType, 080 IAsset.class)); 081 082 String methodName = op.getAccessorMethodName(propertyName); 083 084 MethodSignature sig = new MethodSignature(propertyType, methodName, null, null); 085 086 String code = "return getAsset(\"" + assetName + "\");"; 087 088 op.addMethod(Modifier.PUBLIC, sig, code, location); 089 } 090 091 public void setErrorLog(ErrorLog errorLog) 092 { 093 _errorLog = errorLog; 094 } 095}