org.jdom2.contrib.helpers.XPathHelper Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jdom Show documentation
Show all versions of jdom Show documentation
A complete, Java-based solution for accessing, manipulating,
and outputting XML data
The newest version!
/*--
Copyright (C) 2000-2004 Jason Hunter & Brett McLaughlin.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions, and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions, and the disclaimer that follows
these conditions in the documentation and/or other materials
provided with the distribution.
3. The name "JDOM" must not be used to endorse or promote products
derived from this software without prior written permission. For
written permission, please contact .
4. Products derived from this software may not be called "JDOM", nor
may "JDOM" appear in their name, without prior written permission
from the JDOM Project Management .
In addition, we request (but do not require) that you include in the
end-user documentation provided with the redistribution and/or in the
software itself an acknowledgement equivalent to the following:
"This product includes software developed by the
JDOM Project (http://www.jdom.org/)."
Alternatively, the acknowledgment may be graphical using the logos
available at http://www.jdom.org/images/logos.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
This software consists of voluntary contributions made by many
individuals on behalf of the JDOM Project and was originally
created by Jason Hunter and
Brett McLaughlin . For more information
on the JDOM Project, please see
* Note: As this class has no knowledge of the
* document content, the generated XPath expression rely on the
* document structure. Hence any modification of the structure
* of the document may invalidate the generated XPaths.
*
* @author Laurent Bihanic
* @deprecated moved in to core: org.jdom2.xpath.XPathHelper
* @see org.jdom2.xpath.XPathHelper
*/
@Deprecated
public class XPathHelper {
/**
* Returns the path to the specified Element from the document
* root as an XPath expression.
*
* @param to the Element the generated path shall select.
*
* @return an XPath expression to select the specified node.
*
* @throws JDOMException if the XPath generation failed.
* @throws IllegalArgumentException if to is
* null.
*/
public static String getPathString(Element to) throws JDOMException {
return getPathString(null, to);
}
/**
* Returns the path from a given JDOM node to the specified
* Element as an XPath expression.
*
* @param from the Document or Element node at which the
* the generated path shall be applied. Use
* null to specify the topmost
* ancestor of the to node.
* @param to the Element the generated path shall select.
*
* @return an XPath expression to select the specified node.
*
* @throws JDOMException if the XPath generation failed.
* @throws IllegalArgumentException if to is
* null or from is not
* a {@link Document} or a {@link Element} node.
*/
public static String getPathString(Object from, Element to)
throws JDOMException {
checkPathStringArguments(from, to);
if (to == from) {
return "node()";
}
return getElementPath(from, to, true).toString();
}
/**
* Returns the path to the specified Attribute from the document
* root as an XPath expression.
*
* @param to the Attribute the generated path shall select.
*
* @return an XPath expression to select the specified node.
*
* @throws JDOMException if the XPath generation failed.
* @throws IllegalArgumentException if to is
* null.
*/
public static String getPathString(Attribute to) throws JDOMException {
return getPathString(null, to);
}
/**
* Returns the path from a given JDOM node to the specified
* Attribute as an XPath expression.
*
* @param from the Document or Element node at which the
* the generated path shall be applied. Use
* null to specify the topmost
* ancestor of the to node.
* @param to the Attribute the generated path shall select.
*
* @return an XPath expression to select the specified node.
*
* @throws JDOMException if the XPath generation failed.
* @throws IllegalArgumentException if to is
* null or from is not
* a {@link Document} or a {@link Element} node.
*/
public static String getPathString(Object from, Attribute to)
throws JDOMException {
checkPathStringArguments(from, to);
if (to == from) {
return "node()";
}
StringBuilder path = getElementPath(from, to.getParent(), false);
path.append('@').append(to.getName()).toString();
return path.toString();
}
/**
* Returns the path to the specified Text node from the document
* root as an XPath expression.
*
* @param to the Text node the generated path shall select.
*
* @return an XPath expression to select the specified node.
*
* @throws JDOMException if the XPath generation failed.
* @throws IllegalArgumentException if to is
* null.
*/
public static String getPathString(Text to) throws JDOMException {
return getPathString(null, to);
}
/**
* Returns the path from a given JDOM node to the specified
* Text node as an XPath expression.
*
* @param from the Document or Element node at which the
* the generated path shall be applied. Use
* null to specify the topmost
* ancestor of the to node.
* @param to the Text node the generated path shall select.
*
* @return an XPath expression to select the specified node.
*
* @throws JDOMException if the XPath generation failed.
* @throws IllegalArgumentException if to is
* null or from is not
* a {@link Document} or a {@link Element} node.
*/
public static String getPathString(Object from, Text to)
throws JDOMException {
checkPathStringArguments(from, to);
if (to == from) {
return "node()";
}
Element parent = to.getParentElement();
List siblings = null;
StringBuilder path = getElementPath(from, parent, false);
if (parent != null) {
siblings = parent.getContent(Filters.text());
}
else {
Document doc = to.getDocument();
if (doc != null) {
siblings = doc.getContent(Filters.text());
}
}
return getPositionPath(to, siblings, "text()", path).toString();
}
/**
* Returns the path to the specified Comment from the document
* root as an XPath expression.
*
* @param to the Comment the generated path shall select.
*
* @return an XPath expression to select the specified node.
*
* @throws JDOMException if the XPath generation failed.
* @throws IllegalArgumentException if to is
* null.
*/
public static String getPathString(Comment to) throws JDOMException {
return getPathString(null, to);
}
/**
* Returns the path from a given JDOM node to the specified
* Comment as an XPath expression.
*
* @param from the Document or Element node at which the
* the generated path shall be applied. Use
* null to specify the topmost
* ancestor of the to node.
* @param to the Comment the generated path shall select.
*
* @return an XPath expression to select the specified node.
*
* @throws JDOMException if the XPath generation failed.
* @throws IllegalArgumentException if to is
* null or from is not
* a {@link Document} or a {@link Element} node.
*/
public static String getPathString(Object from, Comment to)
throws JDOMException {
checkPathStringArguments(from, to);
if (to == from) {
return "node()";
}
Element parent = to.getParentElement();
List siblings = null;
StringBuilder path = getElementPath(from, parent, false);
if (parent != null) {
siblings = parent.getContent(Filters.comment());
}
else {
Document doc = to.getDocument();
if (doc != null) {
siblings = doc.getContent(Filters.comment());
}
}
return getPositionPath(to, siblings, "comment()", path).toString();
}
/**
* Returns the path to the specified ProcessingInstruction node
* from the document root as an XPath expression.
*
* @param to the ProcessingInstruction node the generated path
* shall select.
*
* @return an XPath expression to select the specified node.
*
* @throws JDOMException if the XPath generation failed.
* @throws IllegalArgumentException if to is
* null.
*/
public static String getPathString(ProcessingInstruction to)
throws JDOMException {
return getPathString(null, to);
}
/**
* Returns the path from a given JDOM node to the specified
* ProcessingInstruction node as an XPath expression.
*
* @param from the Document or Element node at which the
* the generated path shall be applied. Use
* null to specify the topmost
* ancestor of the to node.
* @param to the ProcessingInstruction node the generated
* path shall select.
*
* @return an XPath expression to select the specified node.
*
* @throws JDOMException if the XPath generation failed.
* @throws IllegalArgumentException if to is
* null or from is not
* a {@link Document} or a {@link Element} node.
*/
public static String getPathString(Object from, ProcessingInstruction to)
throws JDOMException {
checkPathStringArguments(from, to);
if (to == from) {
return "node()";
}
Element parent = to.getParentElement();
List siblings = null;
StringBuilder path = getElementPath(from, parent, false);
if (parent != null) {
siblings = parent.getContent(Filters.processinginstruction());
}
else {
Document doc = to.getDocument();
if (doc != null) {
siblings = doc.getContent(Filters.processinginstruction());
}
}
return getPositionPath(to, siblings,
"processing-instruction()", path).toString();
}
/**
* Returns the path to the specified JDOM node from the document
* root as an XPath expression.
*
* @param to the JDOM node the generated path shall select.
*
* @return an XPath expression to select the specified node.
*
* @throws JDOMException if the XPath generation failed.
* @throws IllegalArgumentException if to is
* null or is not a JDOM node selectable
* by XPath expressions (Element, Attribute, Text,
* Comment, ProcessingInstruction).
*/
public static String getPathString(Object to) throws JDOMException {
return getPathString(null, to);
}
/**
* Returns the path from a JDOM node to another JDOM node
* as an XPath expression.
*
* @param from the Document or Element node at which the
* the generated path shall be applied. Use
* null to specify the topmost
* ancestor of the to node.
* @param to the JDOM node the generated path shall select.
*
* @return an XPath expression to select the specified node.
*
* @throws JDOMException if the XPath generation failed.
* @throws IllegalArgumentException if from is not
* a {@link Document} or a {@link Element} node or
* to is null or is not a JDOM
* node selectable by XPath expressions (Element,
* Attribute, Text, Comment, ProcessingInstruction).
*/
public static String getPathString(Object from, Object to)
throws JDOMException {
if (to instanceof Element) {
return getPathString(from, (Element) to);
}
else if (to instanceof Attribute) {
return getPathString(from, (Attribute) to);
}
else if (to instanceof Text) {
return getPathString(from, (Text) to);
}
else if (to instanceof Comment) {
return getPathString(from, (Comment) to);
}
else if (to instanceof ProcessingInstruction) {
return getPathString(from, (ProcessingInstruction) to);
}
else {
throw new IllegalArgumentException(
"\"to \" shall be an Element, Attribute," +
" Text, Comment or ProcessingInstruction node");
}
}
/**
* Checks that the two arguments of a getPathString()
* call are valid.
*
* @param from the from node.
* @param to the to node.
*
* @throws IllegalArgumentException if one of the arguments is
* invalid.
*/
private static void checkPathStringArguments(Object from, Object to) {
if (!((from == null) || (from instanceof Element)
|| (from instanceof Document))) {
throw new IllegalArgumentException("from");
}
if (to == null) {
throw new IllegalArgumentException("to");
}
}
/**
* Returns the XPath expression to select the to
* element relatively to the from element.
*
* @param from the from element.
* @param to the to element.
* @param leaf whether the to is the last element
* of the path to return.
*
* @return an XPath expression to select the to
* element.
*
* @throws JDOMException if the XPath generation failed.
*/
private static StringBuilder getElementPath(Object from,
Element to, boolean leaf)
throws JDOMException {
if (from instanceof Document) {
from = null;
}
return getElementPath((Element) from, to, leaf, new StringBuilder());
}
/**
* Returns the XPath expression to select the to
* element relatively to the from element.
*
* @param from the from element.
* @param to the to element.
* @param leaf whether the to is the last element
* of the path to return.
* @param path the buffer to which append the path.
*
* @return an XPath expression to select the to
* element.
*
* @throws JDOMException if the XPath generation failed.
*/
private static StringBuilder getElementPath(Element from, Element to,
boolean leaf, StringBuilder path)
throws JDOMException {
if (to != from) {
List siblings = null;
Element parent = to.getParentElement();
if (parent == null) {
// Oops! No more parent but I haven't yet reached the from node.
if (parent != from) {
// Ouch! from node is not an ancestor.
throw new JDOMException(
"The \"from\" node is not an ancestor of the \"to\" node");
}
if (to.isRootElement()) {
path.append('/');
}
}
else {
siblings = parent.getChildren(to.getName(), null);
}
if (parent != from) {
path = getElementPath(from, parent, false, path);
}
Namespace ns = to.getNamespace();
if (ns == Namespace.NO_NAMESPACE) {
// No namespace => Use local name only.
path = getPositionPath(to, siblings, to.getName(), path);
}
else {
// Elements belongs to a namespace => Check prefix.
String prefix = to.getNamespacePrefix();
if ("".equals(prefix)) {
// No prefix (default namespace in scope
// => Use wildcard & local name combination.
path.append("*[local-name()='").
append(to.getName()).append("']");
path = getPositionPath(to, siblings, null, path);
}
else {
// Not the default namespace => Use prefix.
path.append(to.getNamespacePrefix()).append(':');
path = getPositionPath(to, siblings, to.getName(), path);
}
}
if ((!leaf) && (path.length() != 0)) {
path.append('/');
}
}
return (path);
}
/**
* Appends the specified path token to the provided buffer
* followed by the position specification of the target node in
* its siblings list.
*
* @param node the target node for the XPath expression.
* @param siblings the siblings of the target node.
* @param pathToken the path token identifying the target node.
* @param buffer the buffer to which appending the XPath
* sub-expression or null if the
* method shall allocate a new buffer.
*
* @return the XPath sub-expression to select the target node
* among its siblings.
*/
private static StringBuilder getPositionPath(Object node, List siblings,
String pathToken,
StringBuilder buffer) {
if (buffer == null) {
buffer = new StringBuilder();
}
if (pathToken != null) {
buffer.append(pathToken);
}
if ((siblings != null) && (siblings.size() != 1)) {
int position = 0;
for (Iterator i = siblings.iterator(); i.hasNext();) {
position++;
if (i.next() == node) break;
}
buffer.append('[').append(position).append(']');
}
return buffer;
}
}