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Lines 63-146
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private Util() {} |
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private Util() {} |
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/** |
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/** |
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* Search for an XML element in the direct children of a parent. |
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* DOM provides a similar method but it does a recursive search |
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* which we do not want. It also gives a node list and we want |
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* only one result. |
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* @param parent a parent element |
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* @param name the intended local name |
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* @param namespace the intended namespace |
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* @return the one child element with that name, or null if none or more than one |
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*/ |
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public static Element findElement(Element parent, String name, String namespace) { |
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Element result = null; |
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NodeList l = parent.getChildNodes(); |
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int len = l.getLength(); |
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for (int i = 0; i < len; i++) { |
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if (l.item(i).getNodeType() == Node.ELEMENT_NODE) { |
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Element el = (Element)l.item(i); |
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if (name.equals(el.getLocalName()) && |
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((namespace != null && namespace.equals(el.getNamespaceURI())) || namespace == null)) { |
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if (result == null) { |
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result = el; |
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} else { |
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return null; |
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} |
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} |
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} |
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} |
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return result; |
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} |
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/** |
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* Extract nested text from an element. |
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* Currently does not handle coalescing text nodes, CDATA sections, etc. |
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* @param parent a parent element |
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* @return the nested text, or null if none was found |
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*/ |
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public static String findText(Element parent) { |
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NodeList l = parent.getChildNodes(); |
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for (int i = 0; i < l.getLength(); i++) { |
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if (l.item(i).getNodeType() == Node.TEXT_NODE) { |
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Text text = (Text)l.item(i); |
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return text.getNodeValue(); |
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} |
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} |
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return null; |
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} |
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/** |
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* Find all direct child elements of an element. |
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* More useful than {@link Element#getElementsByTagNameNS} because it does |
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* not recurse into recursive child elements. |
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* Children which are all-whitespace text nodes are ignored; others cause |
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* an exception to be thrown. |
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* @param parent a parent element in a DOM tree |
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* @return a list of direct child elements (may be empty) |
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* @throws IllegalArgumentException if there are non-element children besides whitespace |
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*/ |
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public static List<Element> findSubElements(Element parent) throws IllegalArgumentException { |
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NodeList l = parent.getChildNodes(); |
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List<Element> elements = new ArrayList<Element>(l.getLength()); |
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for (int i = 0; i < l.getLength(); i++) { |
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Node n = l.item(i); |
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if (n.getNodeType() == Node.ELEMENT_NODE) { |
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elements.add((Element)n); |
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} else if (n.getNodeType() == Node.TEXT_NODE) { |
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String text = ((Text)n).getNodeValue(); |
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if (text.trim().length() > 0) { |
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throw new IllegalArgumentException("non-ws text encountered in " + parent + ": " + text); // NOI18N |
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} |
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} else if (n.getNodeType() == Node.COMMENT_NODE) { |
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// skip |
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} else { |
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throw new IllegalArgumentException("unexpected non-element child of " + parent + ": " + n); // NOI18N |
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} |
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} |
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return elements; |
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} |
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/** |
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* Create an XML error handler that rethrows errors and fatal errors and logs warnings. |
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* Create an XML error handler that rethrows errors and fatal errors and logs warnings. |
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* @return a standard error handler |
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* @return a standard error handler |
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*/ |
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*/ |