Mega Code Archive
XML and XPath utilities
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// Copyright (c) 2003-2009, Jodd Team (jodd.org). All Rights Reserved.
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Element;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Some XML and XPath utilities.
*/
public class XmlUtil {
// ---------------------------------------------------------------- attributes
/**
* Returns a map of all node's attributes. All non-attribute nodes are ignored.
*/
public static Map<String, String> getAllAttributes(Node node) {
HashMap<String, String> attrs = new HashMap<String, String>();
NamedNodeMap nmm = node.getAttributes();
for (int j = 0; j < nmm.getLength(); j++) {
Node attribute = nmm.item(j);
if (attribute.getNodeType() != Node.ATTRIBUTE_NODE) {
continue;
}
attrs.put(attribute.getNodeName(), attribute.getNodeValue());
}
return attrs;
}
/**
* Returns attribute value of a node or <code>null</code> if attribute name not found.
* Specified attribute is searched on every call.
* Consider {@link #getAllAttributes(org.w3c.dom.Node)} for better performances.
*/
public static String getAttributeValue(Node node, String attrName) {
NamedNodeMap nmm = node.getAttributes();
for (int j = 0; j < nmm.getLength(); j++) {
Node attribute = nmm.item(j);
if (attribute.getNodeType() != Node.ATTRIBUTE_NODE) {
continue;
}
String nodeName = attribute.getNodeName();
if (nodeName.equals(attrName)) {
return attribute.getNodeValue();
}
}
return null;
}
/**
* Get element's attribute value or <code>null</code> if attribute not found or empty.
*/
public static String getAttributeValue(Element element, String name) {
String value = element.getAttribute(name);
if (value.length() == 0) {
value = null;
}
return value;
}
// ---------------------------------------------------------------- nodelist
/**
* Filters node list by keeping nodes of specified type.
*/
public static List filterNodeList(NodeList nodeList, short keepNodeType) {
return filterNodeList(nodeList, keepNodeType, null);
}
/**
* Filters node list by keeping nodes of specified type and node name.
*/
public static List<Node> filterNodeList(NodeList nodeList, short keepNodeType, String nodeName) {
List<Node> nodes = new ArrayList<Node>();
for (int k = 0; k < nodeList.getLength(); k++) {
Node node = nodeList.item(k);
if (node.getNodeType() != keepNodeType) {
continue;
}
if (nodeName != null && (node.getNodeName().equals(nodeName) == false)) {
continue;
}
nodes.add(node);
}
return nodes;
}
/**
* Filter node list for all Element nodes.
*/
public static List filterNodeListElements(NodeList nodeList) {
return filterNodeListElements(nodeList, null);
}
/**
* Filter node list for Element nodes of specified name.
*/
public static List<Node> filterNodeListElements(NodeList nodeList, String nodeName) {
List<Node> nodes = new ArrayList<Node>();
for (int k = 0; k < nodeList.getLength(); k++) {
Node node = nodeList.item(k);
if (node.getNodeType() != Node.ELEMENT_NODE) {
continue;
}
if (nodeName != null && (node.getNodeName().equals(nodeName) == false)) {
continue;
}
nodes.add(node);
}
return nodes;
}
/**
* Returns a list of all child Elements,
*/
public static List getChildElements(Node node) {
return getChildElements(node, null);
}
/**
* Returns a list of child Elements of specified name.
*/
public static List getChildElements(Node node, String nodeName) {
NodeList childs = node.getChildNodes();
return filterNodeListElements(childs, nodeName);
}
// ---------------------------------------------------------------- node
/**
* Returns value of first available child text node or <code>null</code> if not found.
*/
public static String getFirstChildTextNodeValue(Node node) {
NodeList children = node.getChildNodes();
int len = children.getLength();
for (int i = 0; i < len; i++) {
Node n = children.item(i);
if (n.getNodeType() == Node.TEXT_NODE) {
return n.getNodeValue();
}
}
return null;
}
/**
* Returns value of single child text node or <code>null</code>.
*/
public static String getChildTextNodeValue(Node node) {
if (node.getChildNodes().getLength() != 1) {
return null;
}
Node item0 = node.getChildNodes().item(0);
if (item0.getNodeType() != Node.TEXT_NODE) {
return null;
}
return item0.getNodeValue();
}
}
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