|
1
17
18
19
20 package org.apache.lenya.cms.publication;
21
22 import java.io.File  ;
23 import java.io.IOException ;
24 import java.util.ArrayList ;
25 import java.util.List ;
26
27 import javax.xml.parsers.ParserConfigurationException ;
28
29 import org.apache.lenya.xml.DocumentHelper;
30 import org.apache.lenya.xml.NamespaceHelper;
31 import org.apache.log4j.Category;
32 import org.apache.xpath.XPathAPI;
33 import org.w3c.dom.Element ;
34 import org.w3c.dom.Node ;
35 import org.w3c.dom.NodeList ;
36 import org.xml.sax.SAXException ;
37
38
41 public class CollectionImpl extends DefaultDocument implements Collection {
42
43 private static final Category log = Category.getInstance(CollectionImpl.class);
44
45
52 public CollectionImpl(Publication publication, String id, String area) throws DocumentException {
53 super(publication, id, area);
54 }
55
56
64 public CollectionImpl(Publication publication, String id, String area, String language) throws DocumentException {
65 super(publication, id, area, language);
66 }
67
68 private List documentsList = new ArrayList ();
69
70
75 protected List documents() throws DocumentException {
76 load();
77 return documentsList;
78 }
79
80
83 public Document[] getDocuments() throws DocumentException {
84 return (Document[]) documents().toArray(new Document[documents().size()]);
85 }
86
87
90 public void add(Document document) throws DocumentException {
91 documents().add(document);
92 save();
93 }
94
95
98 public void add(int position, Document document) throws DocumentException {
99 documents().add(position, document);
100 save();
101 }
102
103
106 public void remove(Document document) throws DocumentException {
107 if (!documents().contains(document)) {
108 throw new DocumentException(
109 "Collection [" + this +"] does not contain document [" + document + "]");
110 }
111 documents().remove(document);
112 save();
113 }
114
115 private boolean isLoaded = false;
116
117
121 protected void load() throws DocumentException {
122 if (!isLoaded) {
123 log.debug("Loading: ", new DocumentException());
124 NamespaceHelper helper;
125 try {
126 helper = getNamespaceHelper();
127
128 Element collectionElement = helper.getDocument().getDocumentElement();
129 Element [] documentElements =
130 helper.getChildren(collectionElement, ELEMENT_DOCUMENT);
131
132 for (int i = 0; i < documentElements.length; i++) {
133 Element documentElement = documentElements[i];
134 Document document = loadDocument(documentElement);
135 documentsList.add(document);
136 }
137 } catch (DocumentException e) {
138 throw e;
139 } catch (Exception e) {
140 throw new DocumentException(e);
141 }
142 isLoaded = true;
143 }
144 }
145
146
152 protected Document loadDocument(Element documentElement) throws DocumentBuildException {
153 DocumentBuilder builder = getPublication().getDocumentBuilder();
154 String documentId = documentElement.getAttribute(ATTRIBUTE_ID);
155 String url =
156 builder.buildCanonicalUrl(
157 getPublication(),
158 getArea(),
159 documentId,
160 getLanguage());
161 Document document = builder.buildDocument(getPublication(), url);
162 return document;
163 }
164
165
169 public void save() throws DocumentException {
170 try {
171
172 NamespaceHelper helper = getNamespaceHelper();
173 Element collectionElement = helper.getDocument().getDocumentElement();
174 if (collectionElement.getAttributeNS(null, ATTRIBUTE_ID) == null | collectionElement.getAttribute(ATTRIBUTE_ID).equals("")) {
175 collectionElement.setAttributeNS(null, ATTRIBUTE_ID, this.getId());
176 }
177 Element [] existingDocumentElements = helper.getChildren(collectionElement, ELEMENT_DOCUMENT);
178 for (int i = 0; i < existingDocumentElements.length; i++) {
179 collectionElement.removeChild(existingDocumentElements[i]);
180 }
181
182 collectionElement.normalize();
183
184 NodeList emptyTextNodes = XPathAPI.selectNodeList(collectionElement, "text()");
185 for (int i = 0; i < emptyTextNodes.getLength(); i++) {
186 Node node = emptyTextNodes.item(i);
187 node = collectionElement.removeChild(node);
188 }
189
190 Document[] documents = getDocuments();
191 for (int i = 0; i < documents.length; i++) {
192 Element documentElement = createDocumentElement(documents[i], helper);
193 collectionElement.appendChild(documentElement);
194 }
195 DocumentHelper.writeDocument(helper.getDocument(), getFile());
196
197 } catch (DocumentException e) {
198 throw e;
199 } catch (Exception e) {
200 throw new DocumentException(e);
201 }
202 }
203
204
211 protected Element createDocumentElement(Document document, NamespaceHelper helper)
212 throws DocumentException {
213 Element documentElement = helper.createElement(ELEMENT_DOCUMENT);
214 documentElement.setAttributeNS(null, ATTRIBUTE_ID, document.getId());
215 return documentElement;
216 }
217
218
226 protected NamespaceHelper getNamespaceHelper()
227 throws DocumentException, ParserConfigurationException , SAXException , IOException {
228
229 NamespaceHelper helper;
230
231 if (exists()) {
232 File file = getFile();
233 org.w3c.dom.Document document = DocumentHelper.readDocument(file);
234 helper = new NamespaceHelper(Collection.NAMESPACE, Collection.DEFAULT_PREFIX, document);
235 } else {
236 helper =
237 new NamespaceHelper(
238 Collection.NAMESPACE,
239 Collection.DEFAULT_PREFIX,
240 ELEMENT_COLLECTION);
241 }
242 return helper;
243 }
244
245
248 public boolean contains(Document document) throws DocumentException {
249 return documents().contains(document);
250 }
251
252
255 public void clear() throws DocumentException {
256 documents().clear();
257 }
258
259
262 public int getFirstPosition(Document document) throws DocumentException {
263 load();
264 if (!contains(document)) {
265 throw new DocumentException(
266 "The collection [" + this +"] does not contain the document [" + document + "]");
267 }
268 return documents().indexOf(document);
269 }
270
271
274 public int size() throws DocumentException {
275 return documents().size();
276 }
277
278 }
279 |
Popular Tags |
Java API By Example, From Geeks To Geeks.