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.tapestry.engine; 016 017 import java.util.HashMap; 018 import java.util.Map; 019 020 import org.apache.hivemind.ApplicationRuntimeException; 021 import org.apache.hivemind.ClassResolver; 022 import org.apache.hivemind.Resource; 023 import org.apache.tapestry.IScript; 024 import org.apache.tapestry.Tapestry; 025 import org.apache.tapestry.coerce.ValueConverter; 026 import org.apache.tapestry.event.ReportStatusEvent; 027 import org.apache.tapestry.event.ReportStatusListener; 028 import org.apache.tapestry.event.ResetEventListener; 029 import org.apache.tapestry.script.ScriptParser; 030 import org.apache.tapestry.services.ExpressionEvaluator; 031 import org.apache.tapestry.util.xml.DocumentParseException; 032 033 /** 034 * Provides basic access to scripts available on the classpath. Scripts are cached in memory once 035 * parsed. 036 * 037 * @author Howard Lewis Ship 038 * @since 1.0.2 039 */ 040 041 public class DefaultScriptSource implements IScriptSource, ResetEventListener, ReportStatusListener 042 { 043 private String _serviceId; 044 045 private ClassResolver _classResolver; 046 047 /** @since 4.0 */ 048 private ExpressionEvaluator _expressionEvaluator; 049 050 /** @since 4.0 */ 051 private ValueConverter _valueConverter; 052 053 private Map _cache = new HashMap(); 054 055 public synchronized void resetEventDidOccur() 056 { 057 _cache.clear(); 058 } 059 060 public synchronized void reportStatus(ReportStatusEvent event) 061 { 062 event.title(_serviceId); 063 event.property("parsed script count", _cache.size()); 064 event.collection("parsed scripts", _cache.keySet()); 065 } 066 067 public synchronized IScript getScript(Resource resource) 068 { 069 IScript result = (IScript) _cache.get(resource); 070 071 if (result != null) 072 return result; 073 074 result = parse(resource); 075 076 _cache.put(resource, result); 077 078 return result; 079 } 080 081 private IScript parse(Resource resource) 082 { 083 ScriptParser parser = new ScriptParser(_classResolver, _expressionEvaluator, 084 _valueConverter); 085 086 try 087 { 088 return parser.parse(resource); 089 } 090 catch (DocumentParseException ex) 091 { 092 throw new ApplicationRuntimeException(Tapestry.format( 093 "DefaultScriptSource.unable-to-parse-script", 094 resource), ex); 095 } 096 } 097 098 public void setClassResolver(ClassResolver classResolver) 099 { 100 _classResolver = classResolver; 101 } 102 103 /** @since 4.0 */ 104 public void setExpressionEvaluator(ExpressionEvaluator expressionEvaluator) 105 { 106 _expressionEvaluator = expressionEvaluator; 107 } 108 109 /** @since 4.0 */ 110 public void setValueConverter(ValueConverter valueConverter) 111 { 112 _valueConverter = valueConverter; 113 } 114 115 public void setServiceId(String serviceId) 116 { 117 _serviceId = serviceId; 118 } 119 }