Java Tutorial/XML/Namespace
Содержание
- 1 Access elements from document with namespaces
- 2 Checks whether the supplied String is an NCName (Namespace Classified Name)
- 3 Create Namespace
- 4 Creates a QName instance from the given namespace context for the given qualifiedName
- 5 Finds and returns the first child node with the given qualified name.
- 6 Finds and returns the last child node with the given qualified name.
- 7 Finds and returns the next sibling node with the given qualified name.
- 8 Get all prefixes defined on this element for the specified namespace.
- 9 Get all prefixes defined, up to the root, for a namespace URI.
- 10 Get Attribute by QName
- 11 Handling namespaces during parsing
- 12 Returns the first element that has the specified local name.
- 13 Set a namespace/prefix on an element if it is not set already.
- 14 Starting from a node, find the namespace declaration for a prefix.
Access elements from document with namespaces
<source lang="java">
import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.w3c.dom.Attr; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; public class Main {
public static void main(String[] argv) throws Exception {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
factory.setValidating(true);
DocumentBuilder loader = factory.newDocumentBuilder();
Document document = loader.parse("sample.xml");
String docNS = "http://www.my-company.ru";
Element order = document.getDocumentElement();
Attr date = order.getAttributeNodeNS(docNS, "date");
NodeList children = order.getElementsByTagNameNS(docNS, "item");
}
}</source>
Checks whether the supplied String is an NCName (Namespace Classified Name)
<source lang="java">
/*
* Copyright Aduna (http://www.aduna-software.ru/) (c) 1997-2006. * * Licensed under the Aduna BSD-style license. */
public class Utils {
/**
* Checks whether the supplied String is an NCName (Namespace Classified
* Name) as specified at
* .
*/
public static final boolean isNCName(String name) {
int nameLength = name.length();
if (nameLength == 0) {
return false;
}
// Check first character
char c = name.charAt(0);
if (c == "_" || isLetter(c)) {
// Check the rest of the characters
for (int i = 1; i < nameLength; i++) {
c = name.charAt(i);
if (!isNCNameChar(c)) {
return false;
}
}
// All characters have been checked
return true;
}
return false;
}
public static final boolean isNCNameChar(char c) {
return
_isAsciiBaseChar(c) ||
_isAsciiDigit(c) ||
c == "." || c == "-" || c == "_" ||
_isNonAsciiBaseChar(c) ||
_isNonAsciiDigit(c) ||
isIdeographic(c) ||
isCombiningChar(c) ||
isExtender(c);
}
public static final boolean isLetter(char c) {
return
_isAsciiBaseChar(c) ||
_isNonAsciiBaseChar(c) ||
isIdeographic(c);
}
private static final boolean _isAsciiBaseChar(char c) {
return
_charInRange(c, 0x0041, 0x005A) ||
_charInRange(c, 0x0061, 0x007A);
}
private static final boolean _isNonAsciiBaseChar(char c) {
return
_charInRange(c, 0x00C0, 0x00D6) ||
_charInRange(c, 0x00D8, 0x00F6) ||
_charInRange(c, 0x00F8, 0x00FF) ||
_charInRange(c, 0x0100, 0x0131) ||
_charInRange(c, 0x0134, 0x013E) ||
_charInRange(c, 0x0141, 0x0148) ||
_charInRange(c, 0x014A, 0x017E) ||
_charInRange(c, 0x0180, 0x01C3) ||
_charInRange(c, 0x01CD, 0x01F0) ||
_charInRange(c, 0x01F4, 0x01F5) ||
_charInRange(c, 0x01FA, 0x0217) ||
_charInRange(c, 0x0250, 0x02A8) ||
_charInRange(c, 0x02BB, 0x02C1) ||
c == 0x0386 ||
_charInRange(c, 0x0388, 0x038A) ||
c == 0x038C ||
_charInRange(c, 0x038E, 0x03A1) ||
_charInRange(c, 0x03A3, 0x03CE) ||
_charInRange(c, 0x03D0, 0x03D6) ||
c == 0x03DA ||
c == 0x03DC ||
c == 0x03DE ||
c == 0x03E0 ||
_charInRange(c, 0x03E2, 0x03F3) ||
_charInRange(c, 0x0401, 0x040C) ||
_charInRange(c, 0x040E, 0x044F) ||
_charInRange(c, 0x0451, 0x045C) ||
_charInRange(c, 0x045E, 0x0481) ||
_charInRange(c, 0x0490, 0x04C4) ||
_charInRange(c, 0x04C7, 0x04C8) ||
_charInRange(c, 0x04CB, 0x04CC) ||
_charInRange(c, 0x04D0, 0x04EB) ||
_charInRange(c, 0x04EE, 0x04F5) ||
_charInRange(c, 0x04F8, 0x04F9) ||
_charInRange(c, 0x0531, 0x0556) ||
c == 0x0559 ||
_charInRange(c, 0x0561, 0x0586) ||
_charInRange(c, 0x05D0, 0x05EA) ||
_charInRange(c, 0x05F0, 0x05F2) ||
_charInRange(c, 0x0621, 0x063A) ||
_charInRange(c, 0x0641, 0x064A) ||
_charInRange(c, 0x0671, 0x06B7) ||
_charInRange(c, 0x06BA, 0x06BE) ||
_charInRange(c, 0x06C0, 0x06CE) ||
_charInRange(c, 0x06D0, 0x06D3) ||
c == 0x06D5 ||
_charInRange(c, 0x06E5, 0x06E6) ||
_charInRange(c, 0x0905, 0x0939) ||
c == 0x093D ||
_charInRange(c, 0x0958, 0x0961) ||
_charInRange(c, 0x0985, 0x098C) ||
_charInRange(c, 0x098F, 0x0990) ||
_charInRange(c, 0x0993, 0x09A8) ||
_charInRange(c, 0x09AA, 0x09B0) ||
c == 0x09B2 ||
_charInRange(c, 0x09B6, 0x09B9) ||
_charInRange(c, 0x09DC, 0x09DD) ||
_charInRange(c, 0x09DF, 0x09E1) ||
_charInRange(c, 0x09F0, 0x09F1) ||
_charInRange(c, 0x0A05, 0x0A0A) ||
_charInRange(c, 0x0A0F, 0x0A10) ||
_charInRange(c, 0x0A13, 0x0A28) ||
_charInRange(c, 0x0A2A, 0x0A30) ||
_charInRange(c, 0x0A32, 0x0A33) ||
_charInRange(c, 0x0A35, 0x0A36) ||
_charInRange(c, 0x0A38, 0x0A39) ||
_charInRange(c, 0x0A59, 0x0A5C) ||
c == 0x0A5E ||
_charInRange(c, 0x0A72, 0x0A74) ||
_charInRange(c, 0x0A85, 0x0A8B) ||
c == 0x0A8D ||
_charInRange(c, 0x0A8F, 0x0A91) ||
_charInRange(c, 0x0A93, 0x0AA8) ||
_charInRange(c, 0x0AAA, 0x0AB0) ||
_charInRange(c, 0x0AB2, 0x0AB3) ||
_charInRange(c, 0x0AB5, 0x0AB9) ||
c == 0x0ABD ||
c == 0x0AE0 ||
_charInRange(c, 0x0B05, 0x0B0C) ||
_charInRange(c, 0x0B0F, 0x0B10) ||
_charInRange(c, 0x0B13, 0x0B28) ||
_charInRange(c, 0x0B2A, 0x0B30) ||
_charInRange(c, 0x0B32, 0x0B33) ||
_charInRange(c, 0x0B36, 0x0B39) ||
c == 0x0B3D ||
_charInRange(c, 0x0B5C, 0x0B5D) ||
_charInRange(c, 0x0B5F, 0x0B61) ||
_charInRange(c, 0x0B85, 0x0B8A) ||
_charInRange(c, 0x0B8E, 0x0B90) ||
_charInRange(c, 0x0B92, 0x0B95) ||
_charInRange(c, 0x0B99, 0x0B9A) ||
c == 0x0B9C ||
_charInRange(c, 0x0B9E, 0x0B9F) ||
_charInRange(c, 0x0BA3, 0x0BA4) ||
_charInRange(c, 0x0BA8, 0x0BAA) ||
_charInRange(c, 0x0BAE, 0x0BB5) ||
_charInRange(c, 0x0BB7, 0x0BB9) ||
_charInRange(c, 0x0C05, 0x0C0C) ||
_charInRange(c, 0x0C0E, 0x0C10) ||
_charInRange(c, 0x0C12, 0x0C28) ||
_charInRange(c, 0x0C2A, 0x0C33) ||
_charInRange(c, 0x0C35, 0x0C39) ||
_charInRange(c, 0x0C60, 0x0C61) ||
_charInRange(c, 0x0C85, 0x0C8C) ||
_charInRange(c, 0x0C8E, 0x0C90) ||
_charInRange(c, 0x0C92, 0x0CA8) ||
_charInRange(c, 0x0CAA, 0x0CB3) ||
_charInRange(c, 0x0CB5, 0x0CB9) ||
c == 0x0CDE ||
_charInRange(c, 0x0CE0, 0x0CE1) ||
_charInRange(c, 0x0D05, 0x0D0C) ||
_charInRange(c, 0x0D0E, 0x0D10) ||
_charInRange(c, 0x0D12, 0x0D28) ||
_charInRange(c, 0x0D2A, 0x0D39) ||
_charInRange(c, 0x0D60, 0x0D61) ||
_charInRange(c, 0x0E01, 0x0E2E) ||
c == 0x0E30 ||
_charInRange(c, 0x0E32, 0x0E33) ||
_charInRange(c, 0x0E40, 0x0E45) ||
_charInRange(c, 0x0E81, 0x0E82) ||
c == 0x0E84 ||
_charInRange(c, 0x0E87, 0x0E88) ||
c == 0x0E8A ||
c == 0x0E8D ||
_charInRange(c, 0x0E94, 0x0E97) ||
_charInRange(c, 0x0E99, 0x0E9F) ||
_charInRange(c, 0x0EA1, 0x0EA3) ||
c == 0x0EA5 ||
c == 0x0EA7 ||
_charInRange(c, 0x0EAA, 0x0EAB) ||
_charInRange(c, 0x0EAD, 0x0EAE) ||
c == 0x0EB0 ||
_charInRange(c, 0x0EB2, 0x0EB3) ||
c == 0x0EBD ||
_charInRange(c, 0x0EC0, 0x0EC4) ||
_charInRange(c, 0x0F40, 0x0F47) ||
_charInRange(c, 0x0F49, 0x0F69) ||
_charInRange(c, 0x10A0, 0x10C5) ||
_charInRange(c, 0x10D0, 0x10F6) ||
c == 0x1100 ||
_charInRange(c, 0x1102, 0x1103) ||
_charInRange(c, 0x1105, 0x1107) ||
c == 0x1109 ||
_charInRange(c, 0x110B, 0x110C) ||
_charInRange(c, 0x110E, 0x1112) ||
c == 0x113C ||
c == 0x113E ||
c == 0x1140 ||
c == 0x114C ||
c == 0x114E ||
c == 0x1150 ||
_charInRange(c, 0x1154, 0x1155) ||
c == 0x1159 ||
_charInRange(c, 0x115F, 0x1161) ||
c == 0x1163 ||
c == 0x1165 ||
c == 0x1167 ||
c == 0x1169 ||
_charInRange(c, 0x116D, 0x116E) ||
_charInRange(c, 0x1172, 0x1173) ||
c == 0x1175 ||
c == 0x119E ||
c == 0x11A8 ||
c == 0x11AB ||
_charInRange(c, 0x11AE, 0x11AF) ||
_charInRange(c, 0x11B7, 0x11B8) ||
c == 0x11BA ||
_charInRange(c, 0x11BC, 0x11C2) ||
c == 0x11EB ||
c == 0x11F0 ||
c == 0x11F9 ||
_charInRange(c, 0x1E00, 0x1E9B) ||
_charInRange(c, 0x1EA0, 0x1EF9) ||
_charInRange(c, 0x1F00, 0x1F15) ||
_charInRange(c, 0x1F18, 0x1F1D) ||
_charInRange(c, 0x1F20, 0x1F45) ||
_charInRange(c, 0x1F48, 0x1F4D) ||
_charInRange(c, 0x1F50, 0x1F57) ||
c == 0x1F59 ||
c == 0x1F5B ||
c == 0x1F5D ||
_charInRange(c, 0x1F5F, 0x1F7D) ||
_charInRange(c, 0x1F80, 0x1FB4) ||
_charInRange(c, 0x1FB6, 0x1FBC) ||
c == 0x1FBE ||
_charInRange(c, 0x1FC2, 0x1FC4) ||
_charInRange(c, 0x1FC6, 0x1FCC) ||
_charInRange(c, 0x1FD0, 0x1FD3) ||
_charInRange(c, 0x1FD6, 0x1FDB) ||
_charInRange(c, 0x1FE0, 0x1FEC) ||
_charInRange(c, 0x1FF2, 0x1FF4) ||
_charInRange(c, 0x1FF6, 0x1FFC) ||
c == 0x2126 ||
_charInRange(c, 0x212A, 0x212B) ||
c == 0x212E ||
_charInRange(c, 0x2180, 0x2182) ||
_charInRange(c, 0x3041, 0x3094) ||
_charInRange(c, 0x30A1, 0x30FA) ||
_charInRange(c, 0x3105, 0x312C) ||
_charInRange(c, 0xAC00, 0xD7A3);
}
public static final boolean isIdeographic(char c) {
return
_charInRange(c, 0x4E00, 0x9FA5) ||
c == 0x3007 ||
_charInRange(c, 0x3021, 0x3029);
}
public static final boolean isCombiningChar(char c) {
return
_charInRange(c, 0x0300, 0x0345) ||
_charInRange(c, 0x0360, 0x0361) ||
_charInRange(c, 0x0483, 0x0486) ||
_charInRange(c, 0x0591, 0x05A1) ||
_charInRange(c, 0x05A3, 0x05B9) ||
_charInRange(c, 0x05BB, 0x05BD) ||
c == 0x05BF ||
_charInRange(c, 0x05C1, 0x05C2) ||
c == 0x05C4 ||
_charInRange(c, 0x064B, 0x0652) ||
c == 0x0670 ||
_charInRange(c, 0x06D6, 0x06DC) ||
_charInRange(c, 0x06DD, 0x06DF) ||
_charInRange(c, 0x06E0, 0x06E4) ||
_charInRange(c, 0x06E7, 0x06E8) ||
_charInRange(c, 0x06EA, 0x06ED) ||
_charInRange(c, 0x0901, 0x0903) ||
c == 0x093C ||
_charInRange(c, 0x093E, 0x094C) ||
c == 0x094D ||
_charInRange(c, 0x0951, 0x0954) ||
_charInRange(c, 0x0962, 0x0963) ||
_charInRange(c, 0x0981, 0x0983) ||
c == 0x09BC ||
c == 0x09BE ||
c == 0x09BF ||
_charInRange(c, 0x09C0, 0x09C4) ||
_charInRange(c, 0x09C7, 0x09C8) ||
_charInRange(c, 0x09CB, 0x09CD) ||
c == 0x09D7 ||
_charInRange(c, 0x09E2, 0x09E3) ||
c == 0x0A02 ||
c == 0x0A3C ||
c == 0x0A3E ||
c == 0x0A3F ||
_charInRange(c, 0x0A40, 0x0A42) ||
_charInRange(c, 0x0A47, 0x0A48) ||
_charInRange(c, 0x0A4B, 0x0A4D) ||
_charInRange(c, 0x0A70, 0x0A71) ||
_charInRange(c, 0x0A81, 0x0A83) ||
c == 0x0ABC ||
_charInRange(c, 0x0ABE, 0x0AC5) ||
_charInRange(c, 0x0AC7, 0x0AC9) ||
_charInRange(c, 0x0ACB, 0x0ACD) ||
_charInRange(c, 0x0B01, 0x0B03) ||
c == 0x0B3C ||
_charInRange(c, 0x0B3E, 0x0B43) ||
_charInRange(c, 0x0B47, 0x0B48) ||
_charInRange(c, 0x0B4B, 0x0B4D) ||
_charInRange(c, 0x0B56, 0x0B57) ||
_charInRange(c, 0x0B82, 0x0B83) ||
_charInRange(c, 0x0BBE, 0x0BC2) ||
_charInRange(c, 0x0BC6, 0x0BC8) ||
_charInRange(c, 0x0BCA, 0x0BCD) ||
c == 0x0BD7 ||
_charInRange(c, 0x0C01, 0x0C03) ||
_charInRange(c, 0x0C3E, 0x0C44) ||
_charInRange(c, 0x0C46, 0x0C48) ||
_charInRange(c, 0x0C4A, 0x0C4D) ||
_charInRange(c, 0x0C55, 0x0C56) ||
_charInRange(c, 0x0C82, 0x0C83) ||
_charInRange(c, 0x0CBE, 0x0CC4) ||
_charInRange(c, 0x0CC6, 0x0CC8) ||
_charInRange(c, 0x0CCA, 0x0CCD) ||
_charInRange(c, 0x0CD5, 0x0CD6) ||
_charInRange(c, 0x0D02, 0x0D03) ||
_charInRange(c, 0x0D3E, 0x0D43) ||
_charInRange(c, 0x0D46, 0x0D48) ||
_charInRange(c, 0x0D4A, 0x0D4D) ||
c == 0x0D57 ||
c == 0x0E31 ||
_charInRange(c, 0x0E34, 0x0E3A) ||
_charInRange(c, 0x0E47, 0x0E4E) ||
c == 0x0EB1 ||
_charInRange(c, 0x0EB4, 0x0EB9) ||
_charInRange(c, 0x0EBB, 0x0EBC) ||
_charInRange(c, 0x0EC8, 0x0ECD) ||
_charInRange(c, 0x0F18, 0x0F19) ||
c == 0x0F35 ||
c == 0x0F37 ||
c == 0x0F39 ||
c == 0x0F3E ||
c == 0x0F3F ||
_charInRange(c, 0x0F71, 0x0F84) ||
_charInRange(c, 0x0F86, 0x0F8B) ||
_charInRange(c, 0x0F90, 0x0F95) ||
c == 0x0F97 ||
_charInRange(c, 0x0F99, 0x0FAD) ||
_charInRange(c, 0x0FB1, 0x0FB7) ||
c == 0x0FB9 ||
_charInRange(c, 0x20D0, 0x20DC) ||
c == 0x20E1 ||
_charInRange(c, 0x302A, 0x302F) ||
c == 0x3099 ||
c == 0x309A;
}
public static final boolean isDigit(char c) {
return
_isAsciiDigit(c) ||
_isNonAsciiDigit(c);
}
private static final boolean _isAsciiDigit(char c) {
return
_charInRange(c, 0x0030, 0x0039);
}
private static final boolean _isNonAsciiDigit(char c) {
return
_charInRange(c, 0x0660, 0x0669) ||
_charInRange(c, 0x06F0, 0x06F9) ||
_charInRange(c, 0x0966, 0x096F) ||
_charInRange(c, 0x09E6, 0x09EF) ||
_charInRange(c, 0x0A66, 0x0A6F) ||
_charInRange(c, 0x0AE6, 0x0AEF) ||
_charInRange(c, 0x0B66, 0x0B6F) ||
_charInRange(c, 0x0BE7, 0x0BEF) ||
_charInRange(c, 0x0C66, 0x0C6F) ||
_charInRange(c, 0x0CE6, 0x0CEF) ||
_charInRange(c, 0x0D66, 0x0D6F) ||
_charInRange(c, 0x0E50, 0x0E59) ||
_charInRange(c, 0x0ED0, 0x0ED9) ||
_charInRange(c, 0x0F20, 0x0F29);
}
public static final boolean isExtender(char c) {
return
c == 0x00B7 ||
c == 0x02D0 ||
c == 0x02D1 ||
c == 0x0387 ||
c == 0x0640 ||
c == 0x0E46 ||
c == 0x0EC6 ||
c == 0x3005 ||
_charInRange(c, 0x3031, 0x3035) ||
_charInRange(c, 0x309D, 0x309E) ||
_charInRange(c, 0x30FC, 0x30FE);
}
private static final boolean _charInRange(char c, int start, int end) {
return c >= start && c <= end;
}
}</source>
Create Namespace
<source lang="java">
/**
* Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */
import javax.xml.XMLConstants; import org.w3c.dom.Element; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; /**
* Few simple utils to read DOM. This is originally from the Jakarta Commons Modeler. * * @author Costin Manolache */
public class Utils {
private static final String XMLNAMESPACE = "xmlns";
public static String createNamespace(Element el, String ns) {
String p = "ns1";
int i = 1;
while (getPrefix(el, ns) != null) {
p = "ns" + i;
i++;
}
el.setAttribute(XMLNAMESPACE + ":" + p, ns);
return p;
}
public static String getPrefix(Element el, String ns) {
NamedNodeMap atts = el.getAttributes();
for (int i = 0; i < atts.getLength(); i++) {
Node node = atts.item(i);
String name = node.getNodeName();
if (ns.equals(node.getNodeValue())
&& (name != null && (XMLNAMESPACE.equals(name) || name.startsWith(XMLNAMESPACE + ":")))) {
return node.getPrefix();
}
}
return null;
} }</source>
Creates a QName instance from the given namespace context for the given qualifiedName
<source lang="java">
import javax.xml.namespace.QName; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; public class Utils {
/**
* Creates a QName instance from the given namespace context for the given qualifiedName
*
* @param element the element to use as the namespace context
* @param qualifiedName the fully qualified name
* @return the QName which matches the qualifiedName
*/
public static QName createQName(Element element, String qualifiedName) {
int index = qualifiedName.indexOf(":");
if (index >= 0) {
String prefix = qualifiedName.substring(0, index);
String localName = qualifiedName.substring(index + 1);
String uri = recursiveGetAttributeValue(element, "xmlns:" + prefix);
return new QName(uri, localName, prefix);
} else {
String uri = recursiveGetAttributeValue(element, "xmlns");
if (uri != null) {
return new QName(uri, qualifiedName);
}
return new QName(qualifiedName);
}
}
/**
* Recursive method to find a given attribute value
*/
public static String recursiveGetAttributeValue(Element element, String attributeName) {
String answer = null;
try {
answer = element.getAttribute(attributeName);
} catch (Exception e) {
}
if (answer == null || answer.length() == 0) {
Node parentNode = element.getParentNode();
if (parentNode instanceof Element) {
return recursiveGetAttributeValue((Element) parentNode, attributeName);
}
}
return answer;
}
}</source>
Finds and returns the first child node with the given qualified name.
<source lang="java">
import org.w3c.dom.Element; import org.w3c.dom.Node; /*
* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */
public class Main {
/** Finds and returns the first child node with the given qualified name. */
public static Element getFirstChildElementNS(Node parent,
String[][] elemNames) {
// search for node
Node child = parent.getFirstChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE) {
for (int i = 0; i < elemNames.length; i++) {
String uri = child.getNamespaceURI();
if (uri != null && uri.equals(elemNames[i][0]) &&
child.getLocalName().equals(elemNames[i][1])) {
return (Element)child;
}
}
}
child = child.getNextSibling();
}
// not found
return null;
} // getFirstChildElementNS(Node,String[][]):Element
}</source>
Finds and returns the last child node with the given qualified name.
<source lang="java">
import org.w3c.dom.Element; import org.w3c.dom.Node; /*
* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */
public class Main {
/** Finds and returns the last child node with the given qualified name. */
public static Element getLastChildElementNS(Node parent,
String[][] elemNames) {
// search for node
Node child = parent.getLastChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE) {
for (int i = 0; i < elemNames.length; i++) {
String uri = child.getNamespaceURI();
if (uri != null && uri.equals(elemNames[i][0]) &&
child.getLocalName().equals(elemNames[i][1])) {
return (Element)child;
}
}
}
child = child.getPreviousSibling();
}
// not found
return null;
} // getLastChildElementNS(Node,String[][]):Element
}</source>
Finds and returns the next sibling node with the given qualified name.
<source lang="java">
import org.w3c.dom.Element; import org.w3c.dom.Node; /*
* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */
public class Main {
/** Finds and returns the next sibling node with the given qualified name. */
public static Element getNextSiblingElementNS(Node node,
String[][] elemNames) {
// search for node
Node sibling = node.getNextSibling();
while (sibling != null) {
if (sibling.getNodeType() == Node.ELEMENT_NODE) {
for (int i = 0; i < elemNames.length; i++) {
String uri = sibling.getNamespaceURI();
if (uri != null && uri.equals(elemNames[i][0]) &&
sibling.getLocalName().equals(elemNames[i][1])) {
return (Element)sibling;
}
}
}
sibling = sibling.getNextSibling();
}
// not found
return null;
} // getNextSiblingdElementNS(Node,String[][]):Element
}</source>
Get all prefixes defined on this element for the specified namespace.
<source lang="java">
/**
* Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */
import java.util.List; import javax.xml.XMLConstants; import org.w3c.dom.Element; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; /**
* Few simple utils to read DOM. This is originally from the Jakarta Commons Modeler. * * @author Costin Manolache */
public class Utils {
private static final String XMLNAMESPACE = "xmlns";
/**
* Get all prefixes defined on this element for the specified namespace.
*
* @param element
* @param namespaceUri
* @param prefixes
*/
public static void getPrefixes(Element element, String namespaceUri, List<String> prefixes) {
NamedNodeMap atts = element.getAttributes();
for (int i = 0; i < atts.getLength(); i++) {
Node node = atts.item(i);
String name = node.getNodeName();
if (namespaceUri.equals(node.getNodeValue())
&& (name != null && (XMLNAMESPACE.equals(name) || name.startsWith(XMLNAMESPACE + ":")))) {
prefixes.add(node.getPrefix());
}
}
}
}</source>
Get all prefixes defined, up to the root, for a namespace URI.
<source lang="java">
/**
* Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */
import java.util.List; import javax.xml.XMLConstants; import org.w3c.dom.Element; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; /**
* Few simple utils to read DOM. This is originally from the Jakarta Commons Modeler. * * @author Costin Manolache */
public class Utils {
private static final String XMLNAMESPACE = "xmlns";
/**
* Get all prefixes defined, up to the root, for a namespace URI.
*
* @param element
* @param namespaceUri
* @param prefixes
*/
public static void getPrefixesRecursive(Element element, String namespaceUri, List<String> prefixes) {
getPrefixes(element, namespaceUri, prefixes);
Node parent = element.getParentNode();
if (parent instanceof Element) {
getPrefixesRecursive((Element)parent, namespaceUri, prefixes);
}
}
/**
* Get all prefixes defined on this element for the specified namespace.
*
* @param element
* @param namespaceUri
* @param prefixes
*/
public static void getPrefixes(Element element, String namespaceUri, List<String> prefixes) {
NamedNodeMap atts = element.getAttributes();
for (int i = 0; i < atts.getLength(); i++) {
Node node = atts.item(i);
String name = node.getNodeName();
if (namespaceUri.equals(node.getNodeValue())
&& (name != null && (XMLNAMESPACE.equals(name) || name.startsWith(XMLNAMESPACE + ":")))) {
prefixes.add(node.getPrefix());
}
}
}
}</source>
Get Attribute by QName
<source lang="java">
/**
* Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */
import javax.xml.namespace.QName; import org.w3c.dom.Element; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; /**
* Few simple utils to read DOM. This is originally from the Jakarta Commons * Modeler. * * @author Costin Manolache */
public class Utils {
public static String getAttribute(Element element, QName attName) {
return element.getAttributeNS(attName.getNamespaceURI(), attName.getLocalPart());
} }</source>
Handling namespaces during parsing
<source lang="java">
import java.util.HashMap; import java.util.Iterator; import java.util.Map; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; class SampleOfNamespacePrefixes extends DefaultHandler {
private Map namespaceMapping = new HashMap();
public void startPrefixMapping(String prefix, String uri) throws SAXException {
namespaceMapping.put(uri, prefix);
}
public void endPrefixMapping(String prefix) throws SAXException {
Iterator i = namespaceMapping.keySet().iterator();
for (; i.hasNext();) {
String uri = (String) i.next();
String uriPrefix = (String) namespaceMapping.get(uri);
if (prefix.equals(uriPrefix)) {
namespaceMapping.remove(uri);
break;
}
}
}
}</source>
Returns the first element that has the specified local name.
<source lang="java">
import org.w3c.dom.Element; import org.w3c.dom.Node; public class Utils {
public static Element getFirstChild(Element e, String local) {
for( Node n=e.getFirstChild(); n!=null; n=n.getNextSibling() ) {
if(n.getNodeType()==Node.ELEMENT_NODE) {
Element c = (Element)n;
if(c.getLocalName().equals(local))
return c;
}
}
return null;
} }</source>
Set a namespace/prefix on an element if it is not set already.
<source lang="java">
/**
* Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */
import javax.xml.XMLConstants; import org.w3c.dom.Element; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; /**
* Few simple utils to read DOM. This is originally from the Jakarta Commons Modeler. * * @author Costin Manolache */
public class Utils {
private static final String XMLNAMESPACE = "xmlns";
/**
* Set a namespace/prefix on an element if it is not set already. First off, it searches for the element
* for the prefix associated with the specified namespace. If the prefix isn"t null, then this is
* returned. Otherwise, it creates a new attribute using the namespace/prefix passed as parameters.
*
* @param element
* @param namespace
* @param prefix
* @return the prefix associated with the set namespace
*/
public static String setNamespace(Element element, String namespace, String prefix) {
String pre = getPrefixRecursive(element, namespace);
if (pre != null) {
return pre;
}
element.setAttributeNS(XMLConstants.XMLNS_ATTRIBUTE_NS_URI, "xmlns:" + prefix, namespace);
return prefix;
}
public static String getPrefixRecursive(Element el, String ns) {
String prefix = getPrefix(el, ns);
if (prefix == null && el.getParentNode() instanceof Element) {
prefix = getPrefixRecursive((Element)el.getParentNode(), ns);
}
return prefix;
}
public static String getPrefix(Element el, String ns) {
NamedNodeMap atts = el.getAttributes();
for (int i = 0; i < atts.getLength(); i++) {
Node node = atts.item(i);
String name = node.getNodeName();
if (ns.equals(node.getNodeValue())
&& (name != null && (XMLNAMESPACE.equals(name) || name.startsWith(XMLNAMESPACE + ":")))) {
return node.getPrefix();
}
}
return null;
} }</source>
Starting from a node, find the namespace declaration for a prefix.
<source lang="java">
/**
* Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */
import java.util.List; import javax.xml.XMLConstants; import org.w3c.dom.Element; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; /**
* Few simple utils to read DOM. This is originally from the Jakarta Commons Modeler. * * @author Costin Manolache */
public class Utils {
private static final String XMLNAMESPACE = "xmlns";
/**
* Starting from a node, find the namespace declaration for a prefix. for a matching namespace
* declaration.
*
* @param node search up from here to search for namespace definitions
* @param searchPrefix the prefix we are searching for
* @return the namespace if found.
*/
public static String getNamespace(Node node, String searchPrefix) {
Element el;
while (!(node instanceof Element)) {
node = node.getParentNode();
}
el = (Element)node;
NamedNodeMap atts = el.getAttributes();
for (int i = 0; i < atts.getLength(); i++) {
Node currentAttribute = atts.item(i);
String currentLocalName = currentAttribute.getLocalName();
String currentPrefix = currentAttribute.getPrefix();
if (searchPrefix.equals(currentLocalName) && XMLNAMESPACE.equals(currentPrefix)) {
return currentAttribute.getNodeValue();
} else if (isEmpty(searchPrefix) && XMLNAMESPACE.equals(currentLocalName)
&& isEmpty(currentPrefix)) {
return currentAttribute.getNodeValue();
}
}
Node parent = el.getParentNode();
if (parent instanceof Element) {
return getNamespace((Element)parent, searchPrefix);
}
return null;
}
public static boolean isEmpty(String str) {
return str == null || str.length() == 0;
} }</source>
