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Commons XMLSchema is a light weight schema object model that can be used to manipualte or
generate a schema. It has a clean, easy to use API and can easily be integrated into an existing project
since it has almost no dependancies on third party libraries.
/*
* 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.
*/
package org.apache.ws.commons.schema.utils;
import org.w3c.dom.*;
import java.lang.reflect.Method;
/**
* Some useful utility methods.
* This class was modified in Xerces2 with a view to abstracting as
* much as possible away from the representation of the underlying
* parsed structure (i.e., the DOM). This was done so that, if Xerces
* ever adopts an in-memory representation more efficient than the DOM
* (such as a DTM), we should easily be able to convert our schema
* parsing to utilize it.
*
* @version $ID DOMUtil
*/
public class DOMUtil {
private static final String DEFAULT_ENCODING = "UTF-8";
//
// Constructors
//
/**
* This class cannot be instantiated.
*/
protected DOMUtil() {
}
//
// Public static methods
//
/**
* Finds and returns the first child element node.
*/
public static Element getFirstChildElement(Node parent) {
// search for node
Node child = parent.getFirstChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE) {
return (Element) child;
}
child = child.getNextSibling();
}
// not found
return null;
} // getFirstChildElement(Node):Element
/**
* Finds and returns the last child element node.
*/
public static Element getLastChildElement(Node parent) {
// search for node
Node child = parent.getLastChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE) {
return (Element) child;
}
child = child.getPreviousSibling();
}
// not found
return null;
} // getLastChildElement(Node):Element
/**
* Finds and returns the next sibling element node.
*/
public static Element getNextSiblingElement(Node node) {
// search for node
Node sibling = node.getNextSibling();
while (sibling != null) {
if (sibling.getNodeType() == Node.ELEMENT_NODE) {
return (Element) sibling;
}
sibling = sibling.getNextSibling();
}
// not found
return null;
} // getNextSiblingElement(Node):Element
/**
* Finds and returns the first child node with the given name.
*/
public static Element getFirstChildElement(Node parent, String elemName) {
// search for node
Node child = parent.getFirstChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE) {
if (child.getNodeName().equals(elemName)) {
return (Element) child;
}
}
child = child.getNextSibling();
}
// not found
return null;
} // getFirstChildElement(Node,String):Element
/**
* Finds and returns the last child node with the given name.
*/
public static Element getLastChildElement(Node parent, String elemName) {
// search for node
Node child = parent.getLastChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE) {
if (child.getNodeName().equals(elemName)) {
return (Element) child;
}
}
child = child.getPreviousSibling();
}
// not found
return null;
} // getLastChildElement(Node,String):Element
/**
* Finds and returns the next sibling node with the given name.
*/
public static Element getNextSiblingElement(Node node, String elemName) {
// search for node
Node sibling = node.getNextSibling();
while (sibling != null) {
if (sibling.getNodeType() == Node.ELEMENT_NODE) {
if (sibling.getNodeName().equals(elemName)) {
return (Element) sibling;
}
}
sibling = sibling.getNextSibling();
}
// not found
return null;
} // getNextSiblingdElement(Node,String):Element
/**
* Finds and returns the first child node with the given qualified name.
*/
public static Element getFirstChildElementNS(Node parent,
String uri, String localpart) {
// search for node
Node child = parent.getFirstChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE) {
String childURI = child.getNamespaceURI();
if (childURI != null && childURI.equals(uri) &&
child.getLocalName().equals(localpart)) {
return (Element) child;
}
}
child = child.getNextSibling();
}
// not found
return null;
} // getFirstChildElementNS(Node,String,String):Element
/**
* Finds and returns the last child node with the given qualified name.
*/
public static Element getLastChildElementNS(Node parent,
String uri, String localpart) {
// search for node
Node child = parent.getLastChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE) {
String childURI = child.getNamespaceURI();
if (childURI != null && childURI.equals(uri) &&
child.getLocalName().equals(localpart)) {
return (Element) child;
}
}
child = child.getPreviousSibling();
}
// not found
return null;
} // getLastChildElementNS(Node,String,String):Element
/**
* Finds and returns the next sibling node with the given qualified name.
*/
public static Element getNextSiblingElementNS(Node node,
String uri, String localpart) {
// search for node
Node sibling = node.getNextSibling();
while (sibling != null) {
if (sibling.getNodeType() == Node.ELEMENT_NODE) {
String siblingURI = sibling.getNamespaceURI();
if (siblingURI != null && siblingURI.equals(uri) &&
sibling.getLocalName().equals(localpart)) {
return (Element) sibling;
}
}
sibling = sibling.getNextSibling();
}
// not found
return null;
} // getNextSiblingdElementNS(Node,String,String):Element
/**
* Finds and returns the first child node with the given name.
*/
public static Element getFirstChildElement(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++) {
if (child.getNodeName().equals(elemNames[i])) {
return (Element) child;
}
}
}
child = child.getNextSibling();
}
// not found
return null;
} // getFirstChildElement(Node,String[]):Element
/**
* Finds and returns the last child node with the given name.
*/
public static Element getLastChildElement(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++) {
if (child.getNodeName().equals(elemNames[i])) {
return (Element) child;
}
}
}
child = child.getPreviousSibling();
}
// not found
return null;
} // getLastChildElement(Node,String[]):Element
/**
* Finds and returns the next sibling node with the given name.
*/
public static Element getNextSiblingElement(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++) {
if (sibling.getNodeName().equals(elemNames[i])) {
return (Element) sibling;
}
}
}
sibling = sibling.getNextSibling();
}
// not found
return null;
} // getNextSiblingdElement(Node,String[]):Element
/**
* 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
/**
* 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
/**
* 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
/**
* Finds and returns the first child node with the given name and
* attribute name, value pair.
*/
public static Element getFirstChildElement(Node parent,
String elemName,
String attrName,
String attrValue) {
// search for node
Node child = parent.getFirstChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE) {
Element element = (Element) child;
if (element.getNodeName().equals(elemName) &&
element.getAttribute(attrName).equals(attrValue)) {
return element;
}
}
child = child.getNextSibling();
}
// not found
return null;
} // getFirstChildElement(Node,String,String,String):Element
/**
* Finds and returns the last child node with the given name and
* attribute name, value pair.
*/
public static Element getLastChildElement(Node parent,
String elemName,
String attrName,
String attrValue) {
// search for node
Node child = parent.getLastChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE) {
Element element = (Element) child;
if (element.getNodeName().equals(elemName) &&
element.getAttribute(attrName).equals(attrValue)) {
return element;
}
}
child = child.getPreviousSibling();
}
// not found
return null;
} // getLastChildElement(Node,String,String,String):Element
/**
* Finds and returns the next sibling node with the given name and
* attribute name, value pair. Since only elements have attributes,
* the node returned will be of type Node.ELEMENT_NODE.
*/
public static Element getNextSiblingElement(Node node,
String elemName,
String attrName,
String attrValue) {
// search for node
Node sibling = node.getNextSibling();
while (sibling != null) {
if (sibling.getNodeType() == Node.ELEMENT_NODE) {
Element element = (Element) sibling;
if (element.getNodeName().equals(elemName) &&
element.getAttribute(attrName).equals(attrValue)) {
return element;
}
}
sibling = sibling.getNextSibling();
}
// not found
return null;
} // getNextSiblingElement(Node,String,String,String):Element
/**
* Returns the concatenated child text of the specified node.
* This method only looks at the immediate children of type
* Node.TEXT_NODE or the children of any child
* node that is of type Node.CDATA_SECTION_NODE
* for the concatenation.
*
* @param node The node to look at.
*/
public static String getChildText(Node node) {
// is there anything to do?
if (node == null) {
return null;
}
// concatenate children text
StringBuffer str = new StringBuffer();
Node child = node.getFirstChild();
while (child != null) {
short type = child.getNodeType();
if (type == Node.TEXT_NODE) {
str.append(child.getNodeValue());
} else if (type == Node.CDATA_SECTION_NODE) {
str.append(getChildText(child));
}
child = child.getNextSibling();
}
// return text value
return str.toString();
} // getChildText(Node):String
// return the name of this element
public static String getName(Node node) {
return node.getNodeName();
} // getLocalName(Element): String
/**
* returns local name of this element if not null, otherwise
* returns the name of the node
*/
public static String getLocalName(Node node) {
String name = node.getLocalName();
return (name != null) ? name : node.getNodeName();
} // getLocalName(Element): String
public static Element getParent(Element elem) {
Node parent = elem.getParentNode();
if (parent instanceof Element)
return (Element) parent;
return null;
} // getParent(Element):Element
// get the Document of which this Node is a part
public static Document getDocument(Node node) {
return node.getOwnerDocument();
} // getDocument(Node):Document
// return this Document's root node
public static Element getRoot(Document doc) {
return doc.getDocumentElement();
} // getRoot(Document(: Element
// some methods for handling attributes:
// return the right attribute node
public static Attr getAttr(Element elem, String name) {
return elem.getAttributeNode(name);
} // getAttr(Element, String):Attr
// return the right attribute node
public static Attr getAttrNS(Element elem, String nsUri,
String localName) {
return elem.getAttributeNodeNS(nsUri, localName);
} // getAttrNS(Element, String):Attr
// get all the attributes for an Element
public static Attr[] getAttrs(Element elem) {
NamedNodeMap attrMap = elem.getAttributes();
Attr[] attrArray = new Attr[attrMap.getLength()];
for (int i = 0; i < attrMap.getLength(); i++)
attrArray[i] = (Attr) attrMap.item(i);
return attrArray;
} // getAttrs(Element): Attr[]
// get attribute's value
public static String getValue(Attr attribute) {
return attribute.getValue();
} // getValue(Attr):String
// It is noteworthy that, because of the way the DOM specs
// work, the next two methods return the empty string (not
// null!) when the attribute with the specified name does not
// exist on an element. Beware!
// return the value of the attribute of the given element
// with the given name
public static String getAttrValue(Element elem, String name) {
return elem.getAttribute(name);
} // getAttr(Element, String):Attr
// return the value of the attribute of the given element
// with the given name
public static String getAttrValueNS(Element elem, String nsUri,
String localName) {
return elem.getAttributeNS(nsUri, localName);
} // getAttrValueNS(Element, String):Attr
// return the namespace URI
public static String getNamespaceURI(Node node) {
return node.getNamespaceURI();
}
/**
* Get the input encoding of the document. This uses a DOM 3 API
* call getInputEncoding hence it returns the correct value
* only if a DOM3 API is used. Otherwise it returns the default encoding
* @param doc
* @return
*/
public static String getInputEncoding(Document doc) {
try {
Method m = Document.class.getMethod("getInputEncoding", new Class[]{});
return (String) m.invoke(doc, new Object[]{});
} catch (Exception e) {
return DEFAULT_ENCODING;
}
}
/**
* Get the xml encoding of the document. This uses a DOM 3 API
* call getXmlEncoding hence it returns the correct value
* only if a DOM3 API is used. Otherwise it returns the default encoding
* @see #getInputEncoding(Document)
* @param doc
* @return
*/
public static String getXmlEncoding(Document doc) {
try {
Method m = Document.class.getMethod("getXmlEncoding", new Class[]{});
return (String) m.invoke(doc, new Object[]{});
} catch (Exception e) {
return DEFAULT_ENCODING;
}
}
} // class XUtil
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