| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry.engine; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.tapestry.ApplicationRuntimeException; |
| import org.apache.tapestry.IResourceLocation; |
| import org.apache.tapestry.IResourceResolver; |
| import org.apache.tapestry.IScript; |
| import org.apache.tapestry.Tapestry; |
| import org.apache.tapestry.script.ScriptParser; |
| import org.apache.tapestry.util.xml.DocumentParseException; |
| |
| /** |
| * Provides basic access to scripts available on the classpath. Scripts are cached in |
| * memory once parsed. |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * @since 1.0.2 |
| * |
| **/ |
| |
| public class DefaultScriptSource implements IScriptSource |
| { |
| private IResourceResolver _resolver; |
| |
| private Map _cache = new HashMap(); |
| |
| public DefaultScriptSource(IResourceResolver resolver) |
| { |
| _resolver = resolver; |
| } |
| |
| public synchronized void reset() |
| { |
| _cache.clear(); |
| } |
| |
| public synchronized IScript getScript(IResourceLocation scriptLocation) |
| { |
| IScript result = (IScript) _cache.get(scriptLocation); |
| |
| if (result != null) |
| return result; |
| |
| result = parse(scriptLocation); |
| |
| _cache.put(scriptLocation, result); |
| |
| return result; |
| } |
| |
| private IScript parse(IResourceLocation location) |
| { |
| ScriptParser parser = new ScriptParser(_resolver); |
| |
| try |
| { |
| return parser.parse(location); |
| } |
| catch (DocumentParseException ex) |
| { |
| throw new ApplicationRuntimeException( |
| Tapestry.format("DefaultScriptSource.unable-to-parse-script", location), |
| ex); |
| } |
| } |
| |
| public String toString() |
| { |
| StringBuffer buffer = new StringBuffer("DefaultScriptSource@"); |
| buffer.append(Integer.toHexString(hashCode())); |
| |
| buffer.append('['); |
| |
| if (_cache != null) |
| { |
| synchronized (_cache) |
| { |
| buffer.append(_cache.keySet()); |
| } |
| |
| buffer.append(", "); |
| } |
| |
| buffer.append("]"); |
| |
| return buffer.toString(); |
| } |
| |
| } |