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;
36 import java.util.List;
39 import mir.generator.tal.interfaces.TALExpressionParser;
40 import mir.generator.tal.template.CoreTemplateNodeLibrary;
41 import mir.generator.tal.template.MacroTemplateNodeLibrary;
42 import mir.generator.tal.template.Template;
43 import mir.generator.tal.template.TemplateLibrary;
44 import mir.generator.tal.template.TemplateNode;
45 import mir.generator.tal.template.TemplateNodeLibrary;
46 import mir.generator.tal.template.TemplateProcessingException;
47 import mir.util.StringRoutines;
49 public class TALTemplateEngine implements TemplateLibrary {
50 private TALExpressionParser expressionParser;
51 private File basePath;
52 private CachingFileLoader loader;
54 private SimpleTemplateNodeLibraryRegistry registry;
56 public TALTemplateEngine(TALExpressionParser anExpressionParser, File aBasePath) {
57 expressionParser = anExpressionParser;
59 loader = new CachingFileLoader(100, new TemplateFactory());
61 registry = new SimpleTemplateNodeLibraryRegistry();
63 registerTemplateNodeLibrary("tal", "http://xml.zope.org/namespaces/tal",
64 new CoreTemplateNodeLibrary("tal", "http://xml.zope.org/namespaces/tal"));
65 registerTemplateNodeLibrary("metal", "http://xml.zope.org/namespaces/metal",
66 new MacroTemplateNodeLibrary("metal", "http://xml.zope.org/namespaces/metal"));
69 public void registerTemplateNodeLibrary(String aPrefix, String aUrl, TemplateNodeLibrary aLibrary) {
70 registry.registerTemplateNodeLibrary(aPrefix, aUrl, aLibrary);
73 public Template loadTemplate(String aName) throws IOException, TemplateProcessingException {
74 List parts = StringRoutines.splitString(aName, "#");
76 if (parts.size()!=1 && parts.size()!=2) {
77 throw new TemplateProcessingException("Invalid template name: " + aName);
80 File location = new File(basePath, (String) parts.get(0));
82 Template baseTemplate = (Template) loader.retrieveFile(location.getCanonicalPath());
84 if (baseTemplate!=null && parts.size()>1) {
85 Map definitions = (Map) baseTemplate.getContext().get(MacroTemplateNodeLibrary.MACRO_DEFINITIONS_KEY);
86 if (definitions==null || !definitions.containsKey(parts.get(1))) {
87 throw new TemplateProcessingException("No macro '"+(String) parts.get(1)+"' found in template '" + (String) parts.get(0) + "'");
90 return new Template(expressionParser, (TemplateNode) definitions.get(parts.get(1)), baseTemplate.getContext());
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);