Java example source code file (DOMUtil.java)
The DOMUtil.java Java example source code
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/*
* Copyright 1999-2002,2004,2005 The Apache Software Foundation.
*
* Licensed 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.
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package com.sun.org.apache.xerces.internal.util;
import java.util.Hashtable;
import com.sun.org.apache.xerces.internal.dom.AttrImpl;
import com.sun.org.apache.xerces.internal.dom.DocumentImpl;
import com.sun.org.apache.xerces.internal.impl.xs.opti.ElementImpl;
import org.w3c.dom.Attr;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.ls.LSException;
/**
* 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.java,v 1.7 2010-11-01 04:40:14 joehw Exp $
*/
public class DOMUtil {
//
// Constructors
//
/** This class cannot be instantiated. */
protected DOMUtil() {}
//
// Public static methods
//
/**
* Copies the source tree into the specified place in a destination
* tree. The source node and its children are appended as children
* of the destination node.
* <p>
* <em>Note: This is an iterative implementation.
*/
public static void copyInto(Node src, Node dest) throws DOMException {
// get node factory
Document factory = dest.getOwnerDocument();
boolean domimpl = factory instanceof DocumentImpl;
// placement variables
Node start = src;
Node parent = src;
Node place = src;
// traverse source tree
while (place != null) {
// copy this node
Node node = null;
int type = place.getNodeType();
switch (type) {
case Node.CDATA_SECTION_NODE: {
node = factory.createCDATASection(place.getNodeValue());
break;
}
case Node.COMMENT_NODE: {
node = factory.createComment(place.getNodeValue());
break;
}
case Node.ELEMENT_NODE: {
Element element = factory.createElement(place.getNodeName());
node = element;
NamedNodeMap attrs = place.getAttributes();
int attrCount = attrs.getLength();
for (int i = 0; i < attrCount; i++) {
Attr attr = (Attr)attrs.item(i);
String attrName = attr.getNodeName();
String attrValue = attr.getNodeValue();
element.setAttribute(attrName, attrValue);
if (domimpl && !attr.getSpecified()) {
((AttrImpl)element.getAttributeNode(attrName)).setSpecified(false);
}
}
break;
}
case Node.ENTITY_REFERENCE_NODE: {
node = factory.createEntityReference(place.getNodeName());
break;
}
case Node.PROCESSING_INSTRUCTION_NODE: {
node = factory.createProcessingInstruction(place.getNodeName(),
place.getNodeValue());
break;
}
case Node.TEXT_NODE: {
node = factory.createTextNode(place.getNodeValue());
break;
}
default: {
throw new IllegalArgumentException("can't copy node type, "+
type+" ("+
place.getNodeName()+')');
}
}
dest.appendChild(node);
// iterate over children
if (place.hasChildNodes()) {
parent = place;
place = place.getFirstChild();
dest = node;
}
// advance
else {
place = place.getNextSibling();
while (place == null && parent != start) {
place = parent.getNextSibling();
parent = parent.getParentNode();
dest = dest.getParentNode();
}
}
}
} // copyInto(Node,Node)
/** 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 first visible child element node. */
public static Element getFirstVisibleChildElement(Node parent) {
// search for node
Node child = parent.getFirstChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE &&
!isHidden(child)) {
return (Element)child;
}
child = child.getNextSibling();
}
// not found
return null;
} // getFirstChildElement(Node):Element
/** Finds and returns the first visible child element node. */
public static Element getFirstVisibleChildElement(Node parent, Hashtable hiddenNodes) {
// search for node
Node child = parent.getFirstChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE &&
!isHidden(child, hiddenNodes)) {
return (Element)child;
}
child = child.getNextSibling();
}
// not found
return null;
} // getFirstChildElement(Node):Element
/** Finds and returns the last child element node.
* Overload previous method for non-Xerces node impl.
*/
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 last visible child element node. */
public static Element getLastVisibleChildElement(Node parent) {
// search for node
Node child = parent.getLastChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE &&
!isHidden(child)) {
return (Element)child;
}
child = child.getPreviousSibling();
}
// not found
return null;
} // getLastChildElement(Node):Element
/** Finds and returns the last visible child element node.
* Overload previous method for non-Xerces node impl
*/
public static Element getLastVisibleChildElement(Node parent, Hashtable hiddenNodes) {
// search for node
Node child = parent.getLastChild();
while (child != null) {
if (child.getNodeType() == Node.ELEMENT_NODE &&
!isHidden(child, hiddenNodes)) {
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
// get next visible (un-hidden) node.
public static Element getNextVisibleSiblingElement(Node node) {
// search for node
Node sibling = node.getNextSibling();
while (sibling != null) {
if (sibling.getNodeType() == Node.ELEMENT_NODE &&
!isHidden(sibling)) {
return (Element)sibling;
}
sibling = sibling.getNextSibling();
}
// not found
return null;
} // getNextSiblingdElement(Node):Element
// get next visible (un-hidden) node, overload previous method for non Xerces node impl
public static Element getNextVisibleSiblingElement(Node node, Hashtable hiddenNodes) {
// search for node
Node sibling = node.getNextSibling();
while (sibling != null) {
if (sibling.getNodeType() == Node.ELEMENT_NODE &&
!isHidden(sibling, hiddenNodes)) {
return (Element)sibling;
}
sibling = sibling.getNextSibling();
}
// not found
return null;
} // getNextSiblingdElement(Node):Element
// set this Node as being hidden
public static void setHidden(Node node) {
if (node instanceof com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)
((com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)node).setReadOnly(true, false);
else if (node instanceof com.sun.org.apache.xerces.internal.dom.NodeImpl)
((com.sun.org.apache.xerces.internal.dom.NodeImpl)node).setReadOnly(true, false);
} // setHidden(node):void
// set this Node as being hidden, overloaded method
public static void setHidden(Node node, Hashtable hiddenNodes) {
if (node instanceof com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl) {
((com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)node).setReadOnly(true, false);
}
else {
hiddenNodes.put(node, "");
}
} // setHidden(node):void
// set this Node as being visible
public static void setVisible(Node node) {
if (node instanceof com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)
((com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)node).setReadOnly(false, false);
else if (node instanceof com.sun.org.apache.xerces.internal.dom.NodeImpl)
((com.sun.org.apache.xerces.internal.dom.NodeImpl)node).setReadOnly(false, false);
} // setVisible(node):void
// set this Node as being visible, overloaded method
public static void setVisible(Node node, Hashtable hiddenNodes) {
if (node instanceof com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl) {
((com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)node).setReadOnly(false, false);
}
else {
hiddenNodes.remove(node);
}
} // setVisible(node):void
// is this node hidden?
public static boolean isHidden(Node node) {
if (node instanceof com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)
return ((com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)node).getReadOnly();
else if (node instanceof com.sun.org.apache.xerces.internal.dom.NodeImpl)
return ((com.sun.org.apache.xerces.internal.dom.NodeImpl)node).getReadOnly();
return false;
} // isHidden(Node):boolean
// is this node hidden? overloaded method
public static boolean isHidden(Node node, Hashtable hiddenNodes) {
if (node instanceof com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl) {
return ((com.sun.org.apache.xerces.internal.impl.xs.opti.NodeImpl)node).getReadOnly();
}
else {
return hiddenNodes.containsKey(node);
}
} // isHidden(Node):boolean
/** 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
* <code>Node.TEXT_NODE or the children of any child
* node that is of type <code>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 prefix
public static String getPrefix(Node node) {
return node.getPrefix();
}
// return the namespace URI
public static String getNamespaceURI(Node node) {
return node.getNamespaceURI();
}
// return annotation
public static String getAnnotation(Node node) {
if (node instanceof ElementImpl) {
return ((ElementImpl)node).getAnnotation();
}
return null;
}
// return synthetic annotation
public static String getSyntheticAnnotation(Node node) {
if (node instanceof ElementImpl) {
return ((ElementImpl)node).getSyntheticAnnotation();
}
return null;
}
/**
* Creates a DOMException. On J2SE 1.4 and above the cause for the exception will be set.
*/
public static DOMException createDOMException(short code, Throwable cause) {
DOMException de = new DOMException(code, cause != null ? cause.getMessage() : null);
if (cause != null && ThrowableMethods.fgThrowableMethodsAvailable) {
try {
ThrowableMethods.fgThrowableInitCauseMethod.invoke(de, new Object [] {cause});
}
// Something went wrong. There's not much we can do about it.
catch (Exception e) {}
}
return de;
}
/**
* Creates an LSException. On J2SE 1.4 and above the cause for the exception will be set.
*/
public static LSException createLSException(short code, Throwable cause) {
LSException lse = new LSException(code, cause != null ? cause.getMessage() : null);
if (cause != null && ThrowableMethods.fgThrowableMethodsAvailable) {
try {
ThrowableMethods.fgThrowableInitCauseMethod.invoke(lse, new Object [] {cause});
}
// Something went wrong. There's not much we can do about it.
catch (Exception e) {}
}
return lse;
}
/**
* Holder of methods from java.lang.Throwable.
*/
static class ThrowableMethods {
// Method: java.lang.Throwable.initCause(java.lang.Throwable)
private static java.lang.reflect.Method fgThrowableInitCauseMethod = null;
// Flag indicating whether or not Throwable methods available.
private static boolean fgThrowableMethodsAvailable = false;
private ThrowableMethods() {}
// Attempt to get methods for java.lang.Throwable on class initialization.
static {
try {
fgThrowableInitCauseMethod = Throwable.class.getMethod("initCause", new Class [] {Throwable.class});
fgThrowableMethodsAvailable = true;
}
// ClassNotFoundException, NoSuchMethodException or SecurityException
// Whatever the case, we cannot use java.lang.Throwable.initCause(java.lang.Throwable).
catch (Exception exc) {
fgThrowableInitCauseMethod = null;
fgThrowableMethodsAvailable = false;
}
}
}
} // class DOMUtil
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