2 * Copyright (C) 2001, 2002 The Mir-coders group
4 * This file is part of Mir.
6 * Mir is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * Mir is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with Mir; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * In addition, as a special exception, The Mir-coders gives permission to link
21 * the code of this program with any library licensed under the Apache Software License,
22 * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
23 * (or with modified versions of the above that use the same license as the above),
24 * and distribute linked combinations including the two. You must obey the
25 * GNU General Public License in all respects for all of the code used other than
26 * the above mentioned libraries. If you modify this file, you may extend this
27 * exception to your version of the file, but you are not obligated to do so.
28 * If you do not wish to do so, delete this exception statement from your version.
31 package mir.generator.tal;
34 import java.io.IOException;
35 import java.io.InputStream;
37 import java.util.List;
39 import mir.generator.tal.interfaces.TALExpressionParser;
40 import mir.generator.tal.template.*;
41 import mir.util.StringRoutines;
43 public class TALTemplateEngine implements TemplateLibrary {
44 private TALExpressionParser expressionParser;
45 private File basePath;
46 private CachingFileLoader loader;
48 private SimpleTemplateNodeLibraryRegistry registry;
50 public TALTemplateEngine(TALExpressionParser anExpressionParser, File aBasePath) {
51 expressionParser = anExpressionParser;
53 loader = new CachingFileLoader(100, new TemplateFactory());
55 registry = new SimpleTemplateNodeLibraryRegistry();
57 registerTemplateNodeLibrary("tal", "http://xml.zope.org/namespaces/tal",
58 new CoreTemplateNodeLibrary("tal", "http://xml.zope.org/namespaces/tal"));
59 registerTemplateNodeLibrary("metal", "http://xml.zope.org/namespaces/metal",
60 new MacroTemplateNodeLibrary("metal", "http://xml.zope.org/namespaces/metal"));
63 public void registerTemplateNodeLibrary(String aPrefix, String aUrl, TemplateNodeLibrary aLibrary) {
64 registry.registerTemplateNodeLibrary(aPrefix, aUrl, aLibrary);
67 public Template loadTemplate(String aName) throws IOException, TemplateProcessingException {
68 List parts = StringRoutines.splitString(aName, "#");
70 if (parts.size()!=1 && parts.size()!=2) {
71 throw new TemplateProcessingException("Invalid template name: " + aName);
74 File location = new File(basePath, (String) parts.get(0));
76 Template baseTemplate = (Template) loader.retrieveFile(location.getCanonicalPath());
78 if (baseTemplate!=null && parts.size()>1) {
79 Map definitions = (Map) baseTemplate.getContext().get(MacroTemplateNodeLibrary.MACRO_DEFINITIONS_KEY);
80 if (definitions==null || !definitions.containsKey(parts.get(1))) {
81 throw new TemplateProcessingException("No macro '"+(String) parts.get(1)+"' found in template '" + (String) parts.get(0) + "'");
84 return new Template(expressionParser, (TemplateNode) definitions.get(parts.get(1)), baseTemplate.getContext());
92 // public Template(TALExpressionParser aParser, TemplateNode aRootNode, Map aTemplateContext) {
95 public Template lookupTemplate(String aName) throws TemplateProcessingException {
97 return loadTemplate(aName);
99 catch (IOException e) {
100 throw new TemplateProcessingException("Can't load template " + aName + ": " + e.toString(), e);
104 private class TemplateFactory implements CachingFileLoader.CachedFileObjectFactory {
105 public Object constructObject(InputStream aStream) {
107 TALTemplateParser parser = new TALTemplateParser(registry);
109 return parser.parse(aStream, expressionParser);
111 catch (Throwable t) {
112 throw new TALFailure(t);