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.Arrays;
34 import java.util.Date;
35 import java.util.HashMap;
36 import java.util.Iterator;
37 import java.util.List;
39 import java.util.Vector;
41 import mir.log.LoggerWrapper;
42 import mir.util.GeneratorFormatAdapters;
43 import mir.util.RewindableIterator;
45 import org.apache.commons.beanutils.MethodUtils;
46 import org.apache.commons.beanutils.PropertyUtils;
48 import freemarker.template.FileTemplateCache;
49 import freemarker.template.SimpleScalar;
50 import freemarker.template.Template;
51 import freemarker.template.TemplateHashModel;
52 import freemarker.template.TemplateListModel;
53 import freemarker.template.TemplateMethodModel;
54 import freemarker.template.TemplateModel;
55 import freemarker.template.TemplateModelException;
56 import freemarker.template.TemplateModelRoot;
57 import freemarker.template.TemplateScalarModel;
60 public class FreemarkerGenerator implements Generator {
61 private Template template;
63 public FreemarkerGenerator(Template aTemplate) {
67 public void generate(Object anOutputWriter, Map aValues, LoggerWrapper aLogger) throws GeneratorExc, GeneratorFailure {
68 if (!(anOutputWriter instanceof PrintWriter))
69 throw new GeneratorExc("Writer for a FreemarkerGenerator must be a PrintWriter");
72 template.process((TemplateModelRoot) makeMapAdapter(aValues), (PrintWriter) anOutputWriter);
76 aLogger.error("Exception occurred: "+t.getMessage());
77 t.printStackTrace(aLogger.asPrintWriter(LoggerWrapper.DEBUG_MESSAGE));
78 throw new GeneratorFailure( t );
82 private static TemplateScalarModel makeStringAdapter(String aString) {
83 return new SimpleScalar(aString);
86 private static TemplateHashModel makeMapAdapter(Map aMap) {
87 return new MapAdapter(aMap);
90 private static TemplateListModel makeIteratorAdapter(Iterator anIterator) {
91 return new IteratorAdapter(anIterator);
94 private static TemplateMethodModel makeFunctionAdapter(Generator.GeneratorFunction aFunction) {
95 return new FunctionAdapter(aFunction);
98 private static TemplateHashModel makeBeanAdapter(Object anObject) {
99 return new BeanAdapter(anObject);
102 public static TemplateModel makeAdapter(Object anObject) throws TemplateModelException {
103 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 Object[]){
126 if(((Object[])anObject).length <= 1){
127 Object[] array = (Object[]) anObject;
128 return makeAdapter(array[0]);
130 return makeIteratorAdapter(Arrays.asList((Object[]) anObject).iterator());
133 else if (anObject instanceof Number)
134 return makeAdapter(new GeneratorFormatAdapters.NumberFormatAdapter((Number) anObject));
135 else if (anObject instanceof Date)
136 return makeAdapter(new GeneratorFormatAdapters.DateFormatAdapter((Date) anObject));
138 return makeBeanAdapter(anObject);
141 private static class MapAdapter implements TemplateModelRoot {
143 private Map valuesCache;
145 private MapAdapter(Map aMap) {
147 valuesCache = new HashMap();
150 public void put(String aKey, TemplateModel aModel) {
151 valuesCache.put(aKey, aModel);
154 public void remove(String aKey) {
157 public boolean isEmpty() {
158 return map.isEmpty();
161 public TemplateModel get(String aKey) throws TemplateModelException {
163 if (!valuesCache.containsKey(aKey)) {
164 Object value = map.get(aKey);
166 if (value == null && !map.containsKey(aKey)) {
167 throw new TemplateModelException("MapAdapter: no key "+aKey+" available");
170 valuesCache.put(aKey, makeAdapter(value));
173 return (TemplateModel) valuesCache.get(aKey);
175 catch (TemplateModelException e) {
178 catch (Throwable t) {
179 throw new TemplateModelException(t.getMessage());
184 private static class IteratorAdapter implements TemplateListModel {
185 private Iterator iterator;
186 private List valuesCache;
187 private int position;
189 private IteratorAdapter(Iterator anIterator) {
190 iterator = anIterator;
192 valuesCache = new Vector();
196 if (iterator instanceof RewindableIterator) {
197 ((RewindableIterator) iterator).rewind();
201 public boolean isEmpty() {
202 return valuesCache.isEmpty() && !iterator.hasNext();
205 private void getUntil(int anIndex) throws TemplateModelException {
206 while (valuesCache.size()<=anIndex && iterator.hasNext())
208 valuesCache.add(makeAdapter(iterator.next()));
212 public TemplateModel get(int anIndex) throws TemplateModelException {
213 TemplateModel result;
217 if (anIndex<valuesCache.size())
219 result = (TemplateModel) valuesCache.get(anIndex);
224 throw new TemplateModelException( "Iterator out of bounds" );
227 public boolean hasNext() {
228 return position<valuesCache.size() || iterator.hasNext();
231 public boolean isRewound() {
235 public TemplateModel next() throws TemplateModelException {
236 TemplateModel result;
239 result = get(position);
243 throw new TemplateModelException( "Iterator out of bounds" );
248 public void rewind() {
253 private static class ListAdapter implements TemplateListModel {
258 private ListAdapter(List aList) {
260 valuesCache = new Vector();
264 public boolean isEmpty() {
265 return list.isEmpty();
268 public TemplateModel get(int i) throws TemplateModelException {
270 if (i>=valuesCache.size() && i<list.size()) {
271 for(int j=valuesCache.size(); j<=i; j++) {
272 valuesCache.add(makeAdapter(list.get(j)));
276 if (i<valuesCache.size())
277 return (TemplateModel) valuesCache.get(i);
279 throw new TemplateModelException( "Iterator out of bounds" );
282 public boolean hasNext() {
283 return position<list.size();
286 public boolean isRewound() {
290 public TemplateModel next() throws TemplateModelException {
291 TemplateModel result;
294 result = get(position);
298 throw new TemplateModelException( "Iterator out of bounds" );
304 public void rewind() {
309 private static class FunctionAdapter implements TemplateMethodModel {
310 private Generator.GeneratorFunction function;
312 public FunctionAdapter(Generator.GeneratorFunction aFunction) {
313 function = aFunction;
316 public TemplateModel exec(List anArguments) throws TemplateModelException {
318 return makeAdapter(function.perform(anArguments));
320 catch (Throwable t) {
321 throw new TemplateModelException(t.getMessage());
325 public boolean isEmpty() {
331 private static class BeanAdapter implements TemplateHashModel {
332 private Object object;
334 public BeanAdapter(Object anObject) {
338 public void put(String aKey, TemplateModel aModel) throws TemplateModelException {
339 throw new TemplateModelException("FreemarkerGenerator$BeanAdapter.put not supported");
342 public void remove(String aKey) throws TemplateModelException {
343 throw new TemplateModelException("FreemarkerGenerator$BeanAdapter.remove not supported");
346 public boolean isEmpty() {
350 public TemplateModel get(String aKey) throws TemplateModelException {
352 if (PropertyUtils.isReadable(object, aKey))
353 return makeAdapter(PropertyUtils.getSimpleProperty(object, aKey));
355 return makeAdapter(MethodUtils.invokeExactMethod(object, "get", aKey));
357 catch (Throwable t) {
358 throw new TemplateModelException(t.getMessage());
363 public static class FreemarkerGeneratorLibrary implements GeneratorLibrary {
364 private FileTemplateCache templateCache;
366 public FreemarkerGeneratorLibrary(String aTemplateRoot) {
367 templateCache = new FileTemplateCache( aTemplateRoot+"/" );
368 templateCache.setLoadingPolicy(FileTemplateCache.LOAD_ON_DEMAND);
371 public Generator makeGenerator(String anIdentifier) throws GeneratorExc, GeneratorFailure {
372 Template template = (Template) templateCache.getItem(anIdentifier, "template");
374 if (template==null) {
375 throw new GeneratorExc("FreemarkerGeneratorLibrary: Can't find template "+templateCache.getDirectory()+anIdentifier);
378 return new FreemarkerGenerator(template);
382 public static class FreemarkerGeneratorLibraryFactory implements GeneratorLibraryFactory {
383 private String basePath;
385 public FreemarkerGeneratorLibraryFactory(String aBasePath) {
386 basePath = aBasePath;
389 public GeneratorLibrary makeLibrary(String anInitializationString) {
390 return new FreemarkerGeneratorLibrary(basePath+anInitializationString);