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.enhance; 016 017 import java.lang.reflect.Modifier; 018 019 import org.apache.hivemind.Location; 020 import org.apache.hivemind.Resource; 021 import org.apache.hivemind.service.MethodSignature; 022 import org.apache.hivemind.util.Defense; 023 import org.apache.tapestry.IScript; 024 import org.apache.tapestry.engine.IScriptSource; 025 import org.apache.tapestry.spec.InjectSpecification; 026 027 /** 028 * Injects {@link org.apache.tapestry.IScript} instances directly into pages or components. 029 * 030 * @author Howard M. Lewis Ship 031 * @since 4.0 032 */ 033 public class InjectScriptWorker implements InjectEnhancementWorker 034 { 035 private IScriptSource _source; 036 037 public void performEnhancement(EnhancementOperation op, InjectSpecification spec) 038 { 039 String propertyName = spec.getProperty(); 040 String scriptName = spec.getObject(); 041 Location location = spec.getLocation(); 042 043 injectScript(op, propertyName, scriptName, location); 044 } 045 046 /** 047 * Injects a compiled script. 048 * 049 * @param op 050 * the enhancement operation 051 * @param propertyName 052 * the name of the property to inject 053 * @param scriptName 054 * the name of the script (relative to the location) 055 * @param location 056 * the location of the specification; primarily used as the base location for finding 057 * the script. 058 */ 059 060 public void injectScript(EnhancementOperation op, String propertyName, String scriptName, 061 Location location) 062 { 063 Defense.notNull(op, "op"); 064 Defense.notNull(propertyName, "propertyName"); 065 Defense.notNull(scriptName, "scriptName"); 066 Defense.notNull(location, "location"); 067 068 op.claimReadonlyProperty(propertyName); 069 070 Class propertyType = EnhanceUtils.verifyPropertyType(op, propertyName, IScript.class); 071 072 // PropertyType will likely be either java.lang.Object or IScript 073 074 String methodName = op.getAccessorMethodName(propertyName); 075 076 Resource resource = location.getResource().getRelativeResource(scriptName); 077 078 DeferredScript script = new DeferredScriptImpl(resource, _source, location); 079 080 String fieldName = op.addInjectedField("_$script", DeferredScript.class, script); 081 082 MethodSignature sig = new MethodSignature(propertyType, methodName, null, null); 083 084 op.addMethod(Modifier.PUBLIC, sig, "return " + fieldName + ".getScript();", location); 085 } 086 087 public void setSource(IScriptSource source) 088 { 089 _source = source; 090 } 091 }