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1
26
28 package de.nava.informa.utils;
29
30 import java.util.ArrayList  ;
31 import java.util.Iterator ;
32 import java.util.List ;
33 import java.util.StringTokenizer ;
34
35 import org.jdom.Element;
36 import org.jdom.Namespace;
37
38
44 public class XmlPathUtils {
45
46 private XmlPathUtils() {}
47
48 private static final String elementDelim = "/";
49 private static final String prefixDelim = ":";
50
51
64 public static String getElementValue(final Element parent, final String childPath) {
65
66 if (parent == null) {
67 return null;
68 } else {
69 Element child = getLeafChild(parent, childPath);
70 return (child == null) ? null : child.getTextTrim();
71 }
72 }
73
74
92 public static String [] getElementValues(final Element parent, final String childPath, final String [] elements) {
93
94 if (parent == null) {
95 return null;
96 } else {
97 Element child = getLeafChild(parent, childPath);
98 return getElementValues(child, elements);
99 }
100 }
101
102
113 public static String [] getElementValues(final Element parent, final String [] children) {
114 if ((parent == null) || (children == null)) {
115 return null;
116 } else {
117 int numValues = children.length;
118 String [] elementValues = new String [numValues];
119 for (int i = 0; i < numValues; ++i) {
120 Element child = getChild(parent, children[i]);
121 elementValues[i] = (child == null) ? null : child.getTextTrim();
122 }
123 return elementValues;
124 }
125 }
126
127
145 public static String getAttributeValue(final Element parent, final String childPath, final String attribute) {
146
147 if ((parent == null) || (attribute == null)) {
148 return null;
149 } else {
150 Element child = getLeafChild(parent, childPath);
151 return getAttributeValue(child, attribute);
152 }
153 }
154
155
172 public static String [] getAttributeValues(final Element parent, final String childPath, final String [] attributes) {
173
174 if ((parent == null) || (attributes == null)) {
175 return null;
176 } else {
177 Element child = getLeafChild(parent, childPath);
178 return getAttributeValues(child, attributes);
179 }
180 }
181
182
194 public static String [] getAttributeValues(final Element element, final String [] attributes) {
195
196 if ((element == null) || (attributes == null)) {
197 return null;
198 } else {
199 int numAttributes = attributes.length;
200 String [] attributeValues = new String [numAttributes];
201 for (int i = 0; i < numAttributes; ++i) {
202 attributeValues[i] = getAttributeValue(element, attributes[i]);
203 }
204 return attributeValues;
205 }
206 }
207
208
218 private static Element getLeafChild(final Element parent, final String childPath) {
219
220 if (childPath == null) return parent;
221
222 List elementNames = getElementNames(childPath);
223 Iterator iterator = elementNames.iterator();
224 Element nextChild = parent;
225
226 while (iterator.hasNext() && (nextChild != null)) {
227 String elementName = (String ) iterator.next();
228 nextChild = getChild(nextChild, elementName);
229 }
230
231 return nextChild;
232 }
233
234
244 private static Element getChild(final Element parent, final String childName) {
245
246 int prefixPos = childName.indexOf(prefixDelim);
247 if ( (prefixPos == 0) || (prefixPos >= childName.length() - 1)) {
248 return null;
249 } else {
250 if (prefixPos == -1) {
251 return parent.getChild(childName, getNamespace(parent, null));
252 } else {
253 String prefix = childName.substring(0, prefixPos);
254 String childElementName = childName.substring(prefixPos + 1);
255 return parent.getChild(childElementName, getNamespace(parent, prefix));
256 }
257 }
258 }
259
260
271 private static String getAttributeValue(Element element, String attribute) {
272
273 if (element == null) return null;
274 int prefixPos = attribute.indexOf(prefixDelim);
275
276 if ( (prefixPos == 0) || (prefixPos >= attribute.length() - 1)) {
277 return null;
278 } else if (prefixPos == -1) { return element.getAttributeValue(attribute);
280 } else {
281 String prefix = attribute.substring(0, prefixPos);
282 String attributeName = attribute.substring(prefixPos + 1);
283 return element.getAttributeValue(attributeName, getNamespace(element, prefix));
284 }
285 }
286
287
295 private static List getElementNames(final String childPath) {
296
297 List strArray = new ArrayList ();
298 if (childPath != null) {
299 StringTokenizer st = new StringTokenizer (childPath, elementDelim);
300 while (st.hasMoreTokens()) {
301 String token = st.nextToken();
302 if (token.length() > 0) {
303 strArray.add(token);
304 }
305 }
306 }
307 return strArray;
308 }
309
310
318 private static Namespace getNamespace(final Element element, final String prefix) {
319 Namespace namespace = (prefix == null) ? element.getNamespace("") : element.getNamespace(prefix);
320 return (namespace == null) ? Namespace.NO_NAMESPACE : namespace;
321 }
322
323 }
324 |
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