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.
30 package mir.generator;
32 import java.io.PrintWriter;
33 import java.util.Date;
34 import java.util.HashMap;
35 import java.util.Iterator;
36 import java.util.List;
38 import java.util.Vector;
40 import mir.log.LoggerWrapper;
41 import mir.util.GeneratorFormatAdapters;
42 import mir.util.RewindableIterator;
44 import org.apache.commons.beanutils.MethodUtils;
45 import org.apache.commons.beanutils.PropertyUtils;
47 import freemarker.template.FileTemplateCache;
48 import freemarker.template.SimpleScalar;
49 import freemarker.template.Template;
50 import freemarker.template.TemplateHashModel;
51 import freemarker.template.TemplateListModel;
52 import freemarker.template.TemplateMethodModel;
53 import freemarker.template.TemplateModel;
54 import freemarker.template.TemplateModelException;
55 import freemarker.template.TemplateModelRoot;
56 import freemarker.template.TemplateScalarModel;
59 public class FreemarkerGenerator implements Generator {
60 private Template template;
62 public FreemarkerGenerator(Template aTemplate) {
66 public void generate(Object anOutputWriter, Map aValues, LoggerWrapper aLogger) throws GeneratorExc, GeneratorFailure {
67 if (!(anOutputWriter instanceof PrintWriter))
68 throw new GeneratorExc("Writer for a FreemarkerGenerator must be a PrintWriter");
71 template.process((TemplateModelRoot) makeMapAdapter(aValues), (PrintWriter) anOutputWriter);
75 aLogger.error("Exception occurred: "+t.getMessage());
76 t.printStackTrace(aLogger.asPrintWriter(LoggerWrapper.DEBUG_MESSAGE));
77 throw new GeneratorFailure( t );
81 private static TemplateScalarModel makeStringAdapter(String aString) {
82 return new SimpleScalar(aString);
85 private static TemplateHashModel makeMapAdapter(Map aMap) {
86 return new MapAdapter(aMap);
89 private static TemplateListModel makeIteratorAdapter(Iterator anIterator) {
90 return new IteratorAdapter(anIterator);
93 private static TemplateMethodModel makeFunctionAdapter(Generator.GeneratorFunction aFunction) {
94 return new FunctionAdapter(aFunction);
97 private static TemplateHashModel makeBeanAdapter(Object anObject) {
98 return new BeanAdapter(anObject);
101 public static TemplateModel makeAdapter(Object anObject) throws TemplateModelException {
102 if (anObject == null)
105 if (anObject instanceof TemplateModel)
106 return (TemplateModel) anObject;
107 else if (anObject instanceof Generator.GeneratorFunction)
108 return makeFunctionAdapter((Generator.GeneratorFunction) anObject);
109 else if (anObject instanceof Integer)
110 return makeStringAdapter(((Integer) anObject).toString());
111 else if (anObject instanceof Boolean) {
112 if (((Boolean) anObject).booleanValue())
113 return makeStringAdapter("1");
115 return makeStringAdapter("0");
117 else if (anObject instanceof String)
118 return makeStringAdapter((String) anObject);
119 else if (anObject instanceof Map)
120 return makeMapAdapter((Map) anObject);
121 else if (anObject instanceof Iterator)
122 return makeIteratorAdapter((Iterator) anObject);
123 else if (anObject instanceof List)
124 return makeIteratorAdapter(((List) anObject).iterator());
125 else if (anObject instanceof Number)
126 return makeAdapter(new GeneratorFormatAdapters.NumberFormatAdapter((Number) anObject));
127 else if (anObject instanceof Date)
128 return makeAdapter(new GeneratorFormatAdapters.DateFormatAdapter((Date) anObject));
130 return makeBeanAdapter(anObject);
133 private static class MapAdapter implements TemplateModelRoot {
135 private Map valuesCache;
137 private MapAdapter(Map aMap) {
139 valuesCache = new HashMap();
142 public void put(String aKey, TemplateModel aModel) {
143 valuesCache.put(aKey, aModel);
146 public void remove(String aKey) {
149 public boolean isEmpty() {
150 return map.isEmpty();
153 public TemplateModel get(String aKey) throws TemplateModelException {
155 if (!valuesCache.containsKey(aKey)) {
156 Object value = map.get(aKey);
158 if (value == null && !map.containsKey(aKey)) {
159 throw new TemplateModelException("MapAdapter: no key "+aKey+" available");
162 valuesCache.put(aKey, makeAdapter(value));
165 return (TemplateModel) valuesCache.get(aKey);
167 catch (TemplateModelException e) {
170 catch (Throwable t) {
171 throw new TemplateModelException(t.getMessage());
176 private static class IteratorAdapter implements TemplateListModel {
177 private Iterator iterator;
178 private List valuesCache;
179 private int position;
181 private IteratorAdapter(Iterator anIterator) {
182 iterator = anIterator;
184 valuesCache = new Vector();
188 if (iterator instanceof RewindableIterator) {
189 ((RewindableIterator) iterator).rewind();
193 public boolean isEmpty() {
194 return valuesCache.isEmpty() && !iterator.hasNext();
197 private void getUntil(int anIndex) throws TemplateModelException {
198 while (valuesCache.size()<=anIndex && iterator.hasNext())
200 valuesCache.add(makeAdapter(iterator.next()));
204 public TemplateModel get(int anIndex) throws TemplateModelException {
205 TemplateModel result;
209 if (anIndex<valuesCache.size())
211 result = (TemplateModel) valuesCache.get(anIndex);
216 throw new TemplateModelException( "Iterator out of bounds" );
219 public boolean hasNext() {
220 return position<valuesCache.size() || iterator.hasNext();
223 public boolean isRewound() {
227 public TemplateModel next() throws TemplateModelException {
228 TemplateModel result;
231 result = get(position);
235 throw new TemplateModelException( "Iterator out of bounds" );
240 public void rewind() {
245 private static class ListAdapter implements TemplateListModel {
250 private ListAdapter(List aList) {
252 valuesCache = new Vector();
256 public boolean isEmpty() {
257 return list.isEmpty();
260 public TemplateModel get(int i) throws TemplateModelException {
262 if (i>=valuesCache.size() && i<list.size()) {
263 for(int j=valuesCache.size(); j<=i; j++) {
264 valuesCache.add(makeAdapter(list.get(j)));
268 if (i<valuesCache.size())
269 return (TemplateModel) valuesCache.get(i);
271 throw new TemplateModelException( "Iterator out of bounds" );
274 public boolean hasNext() {
275 return position<list.size();
278 public boolean isRewound() {
282 public TemplateModel next() throws TemplateModelException {
283 TemplateModel result;
286 result = get(position);
290 throw new TemplateModelException( "Iterator out of bounds" );
296 public void rewind() {
301 private static class FunctionAdapter implements TemplateMethodModel {
302 private Generator.GeneratorFunction function;
304 public FunctionAdapter(Generator.GeneratorFunction aFunction) {
305 function = aFunction;
308 public TemplateModel exec(List anArguments) throws TemplateModelException {
310 return makeAdapter(function.perform(anArguments));
312 catch (Throwable t) {
313 throw new TemplateModelException(t.getMessage());
317 public boolean isEmpty() {
323 private static class BeanAdapter implements TemplateHashModel {
324 private Object object;
326 public BeanAdapter(Object anObject) {
330 public void put(String aKey, TemplateModel aModel) throws TemplateModelException {
331 throw new TemplateModelException("FreemarkerGenerator$BeanAdapter.put not supported");
334 public void remove(String aKey) throws TemplateModelException {
335 throw new TemplateModelException("FreemarkerGenerator$BeanAdapter.remove not supported");
338 public boolean isEmpty() {
342 public TemplateModel get(String aKey) throws TemplateModelException {
344 if (PropertyUtils.isReadable(object, aKey))
345 return makeAdapter(PropertyUtils.getSimpleProperty(object, aKey));
347 return makeAdapter(MethodUtils.invokeExactMethod(object, "get", aKey));
349 catch (Throwable t) {
350 throw new TemplateModelException(t.getMessage());
355 public static class FreemarkerGeneratorLibrary implements GeneratorLibrary {
356 private FileTemplateCache templateCache;
358 public FreemarkerGeneratorLibrary(String aTemplateRoot) {
359 templateCache = new FileTemplateCache( aTemplateRoot+"/" );
360 templateCache.setLoadingPolicy(FileTemplateCache.LOAD_ON_DEMAND);
363 public Generator makeGenerator(String anIdentifier) throws GeneratorExc, GeneratorFailure {
364 Template template = (Template) templateCache.getItem(anIdentifier, "template");
366 if (template==null) {
367 throw new GeneratorExc("FreemarkerGeneratorLibrary: Can't find template "+templateCache.getDirectory()+"/"+anIdentifier);
370 return new FreemarkerGenerator(template);
374 public static class FreemarkerGeneratorLibraryFactory implements GeneratorLibraryFactory {
375 private String basePath;
377 public FreemarkerGeneratorLibraryFactory(String aBasePath) {
378 basePath = aBasePath;
381 public GeneratorLibrary makeLibrary(String anInitializationString) {
382 return new FreemarkerGeneratorLibrary(basePath+anInitializationString);