org.apache.jackrabbit.webdav.xml
Class DomUtil

java.lang.Object
  org.apache.jackrabbit.webdav.xml.DomUtil

public class DomUtil
extends Object

DomUtil provides some common utility methods related to w3c-DOM.

Constructor Summary

DomUtil()

Method Summary

static Element	addChildElement(Element parent, String localName, Namespace namespace) Add a new child element with the given local name and namespace to the specified parent.
static Element	addChildElement(Element parent, String localName, Namespace namespace, String text) Add a new child element with the given local name and namespace to the specified parent.
static Element	addChildElement(Node parent, String localName, Namespace namespace) Add a new child element with the given local name and namespace to the specified parent.
static Document	createDocument() Creates and returns a new empty DOM document.
static Element	createElement(Document factory, String localName, Namespace namespace) Create a new DOM element with the specified local name and namespace.
static Element	createElement(Document factory, String localName, Namespace namespace, String text) Create a new DOM element with the specified local name and namespace and add the specified text as Text node to it.
static Element	depthToXml(boolean isDeep, Document factory) Returns the Xml representation of a boolean isDeep, where false presents a depth value of '0', true a depth value of 'infinity'.
static Element	depthToXml(String depth, Document factory) Returns the Xml representation of a depth String.
static String	getAttribute(Element parent, String localName, Namespace namespace) Returns the value of the named attribute of the current element.
static Element	getChildElement(Node parent, QName childName) Returns the first child element that matches the given QName.
static Element	getChildElement(Node parent, String childLocalName, Namespace childNamespace) Returns the first child element that matches the given local name and namespace.
static ElementIterator	getChildren(Element parent) Return an ElementIterator over all child elements.
static ElementIterator	getChildren(Element parent, QName childName) Returns a ElementIterator containing all child elements of the given parent node that match the given QName.
static ElementIterator	getChildren(Element parent, String childLocalName, Namespace childNamespace) Returns a ElementIterator containing all child elements of the given parent node that match the given local name and namespace.
static String	getChildText(Element parent, String childLocalName, Namespace childNamespace) Calls getText(Element) on the first child element that matches the given local name and namespace.
static String	getChildTextTrim(Element parent, QName childName) Calls getTextTrim(Element) on the first child element that matches the given name.
static String	getChildTextTrim(Element parent, String childLocalName, Namespace childNamespace) Calls getTextTrim(Element) on the first child element that matches the given local name and namespace.
static List<Node>	getContent(Node parent) Return a list of all child nodes that are either Element, Text or CDATA.
static String	getExpandedName(String localName, Namespace namespace) Returns a string representation of the name of a DOM node consisting of "{" + namespace uri + "}" + localName.
static Element	getFirstChildElement(Node parent) Return the first child element
static Namespace	getNamespace(Element element) Build a Namespace from the prefix and uri retrieved from the given element.
static Attr[]	getNamespaceAttributes(Element element) Returns the namespace attributes of the given element.
static String	getPrefixedName(String localName, Namespace namespace) Return the qualified name of a DOM node consisting of namespace prefix + ":" + local name.
static String	getQualifiedName(String localName, Namespace namespace) Deprecated. As of 2.0. Please use getExpandedName(String, Namespace) instead. This method was named according to usage of 'qualified name' in JSR 170 that conflicts with the terminology used in XMLNS. As of JCR 2.0 the String consisting of "{" + namespace uri + "}" + localName is called Expanded Name.
static String	getText(Element element) Concatenates the values of all child nodes of type 'Text' or 'CDATA'/
static String	getText(Element element, String defaultValue) Same as getText(Element) except that 'defaultValue' is returned instead of null, if the element does not contain any text.
static String	getTextTrim(Element element) Removes leading and trailing whitespace after calling getText(Element).
static boolean	hasChildElement(Node parent, String childLocalName, Namespace childNamespace) Returns true if the given parent node has a child element that matches the specified local name and namespace.
static boolean	hasContent(Node parent) Return true if the given parent contains any child that is either an Element, Text or CDATA.
static Element	hrefToXml(String href, Document factory) Builds a 'DAV:href' Xml element from the given href.
static boolean	matches(Node node, QName requiredName) Returns true if the specified node matches the required QName.
static boolean	matches(Node node, String requiredLocalName, Namespace requiredNamespace) Returns true if the specified node matches the required names.
static Document	parseDocument(InputStream stream) Parses the given input stream and returns the resulting DOM document.
static void	setAttribute(Element element, String attrLocalName, Namespace attrNamespace, String attrValue) Add an attribute node to the given element.
static void	setBuilderFactory(DocumentBuilderFactory documentBuilderFactory) Support the replacement of BUILDER_FACTORY.
static void	setNamespaceAttribute(Element element, String prefix, String uri) Adds a namespace attribute on the given element.
static void	setText(Element element, String text) Create a new text node and add it as child to the given element.
static Element	timeoutToXml(long timeout, Document factory) Converts the given timeout (long value defining the number of milli- second until timeout is reached) to its Xml representation as defined by RFC 4918.
static void	transformDocument(Document xmlDoc, OutputStream out) Uses a new Transformer instance to transform the specified xml document to the specified writer output target.
static void	transformDocument(Document xmlDoc, Writer writer) Uses a new Transformer instance to transform the specified xml document to the specified writer output target.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DomUtil

public DomUtil()

Method Detail

setBuilderFactory

public static void setBuilderFactory(DocumentBuilderFactory documentBuilderFactory)

Support the replacement of BUILDER_FACTORY. This is useful for injecting a customized BuilderFactory, for example with one that uses a local catalog resolver. This is one technique for addressing this issue: http://www.w3.org/blog/systeam/2008/02/08/w3c_s_excessive_dtd_traffic

Parameters:

documentBuilderFactory -

createDocument

public static Document createDocument()
                               throws ParserConfigurationException

Creates and returns a new empty DOM document.

Returns:

new DOM document

Throws:

ParserConfigurationException - if the document can not be created

parseDocument

public static Document parseDocument(InputStream stream)
                              throws ParserConfigurationException,
                                     SAXException,
                                     IOException

Parses the given input stream and returns the resulting DOM document.

Parameters:

stream - XML input stream

Returns:

parsed DOM document

Throws:

ParserConfigurationException - if the document can not be created

SAXException - if the document can not be parsed

IOException - if the input stream can not be read

getAttribute

public static String getAttribute(Element parent,
                                  String localName,
                                  Namespace namespace)

Returns the value of the named attribute of the current element.

Parameters:

parent -

localName - attribute local name or 'nodeName' if no namespace is specified.

namespace - or null

Returns:

attribute value, or null if not found

getNamespaceAttributes

public static Attr[] getNamespaceAttributes(Element element)

Returns the namespace attributes of the given element.

Parameters:

element -

Returns:

the namespace attributes.

getText

public static String getText(Element element)

Concatenates the values of all child nodes of type 'Text' or 'CDATA'/

Parameters:

element -

Returns:

String representing the value of all Text and CDATA child nodes or null if the length of the resulting String is 0.

See Also:

isText(Node)

getText

public static String getText(Element element,
                             String defaultValue)

Same as getText(Element) except that 'defaultValue' is returned instead of null, if the element does not contain any text.

Parameters:

element -

defaultValue -

Returns:

the text contained in the specified element or defaultValue if the element does not contain any text.

getTextTrim

public static String getTextTrim(Element element)

Removes leading and trailing whitespace after calling getText(Element).

Parameters:

element -

Returns:

Trimmed text or null

getChildText

public static String getChildText(Element parent,
                                  String childLocalName,
                                  Namespace childNamespace)

Calls getText(Element) on the first child element that matches the given local name and namespace.

Parameters:

parent -

childLocalName -

childNamespace -

Returns:

text contained in the first child that matches the given local name and namespace or null.

See Also:

getText(Element)

getChildTextTrim

public static String getChildTextTrim(Element parent,
                                      String childLocalName,
                                      Namespace childNamespace)

Calls getTextTrim(Element) on the first child element that matches the given local name and namespace.

Parameters:

parent -

childLocalName -

childNamespace -

Returns:

text contained in the first child that matches the given local name and namespace or null. Note, that leading and trailing whitespace is removed from the text.

See Also:

getTextTrim(Element)

getChildTextTrim

public static String getChildTextTrim(Element parent,
                                      QName childName)

Calls getTextTrim(Element) on the first child element that matches the given name.

Parameters:

parent -

childName -

Returns:

text contained in the first child that matches the given name or null. Note, that leading and trailing whitespace is removed from the text.

See Also:

getTextTrim(Element)

hasChildElement

public static boolean hasChildElement(Node parent,
                                      String childLocalName,
                                      Namespace childNamespace)

Returns true if the given parent node has a child element that matches the specified local name and namespace.

Parameters:

parent -

childLocalName -

childNamespace -

Returns:

returns true if a child element exists that matches the specified local name and namespace.

getChildElement

public static Element getChildElement(Node parent,
                                      String childLocalName,
                                      Namespace childNamespace)

Returns the first child element that matches the given local name and namespace. If no child element is present or no child element matches, null is returned.

Parameters:

parent -

childLocalName -

childNamespace -

Returns:

first child element matching the specified names or null.

getChildElement

public static Element getChildElement(Node parent,
                                      QName childName)

Returns the first child element that matches the given QName. If no child element is present or no child element matches, null is returned.

Parameters:

parent -

childName -

Returns:

first child element matching the specified name or null.

getChildren

public static ElementIterator getChildren(Element parent,
                                          String childLocalName,
                                          Namespace childNamespace)

Returns a ElementIterator containing all child elements of the given parent node that match the given local name and namespace. If the namespace is null only the localName is compared.

Parameters:

parent - the node the children elements should be retrieved from

childLocalName -

childNamespace -

Returns:

an ElementIterator giving access to all child elements that match the specified localName and namespace.

getChildren

public static ElementIterator getChildren(Element parent,
                                          QName childName)

Returns a ElementIterator containing all child elements of the given parent node that match the given QName.

Parameters:

parent - the node the children elements should be retrieved from

childName -

Returns:

an ElementIterator giving access to all child elements that match the specified name.

getChildren

public static ElementIterator getChildren(Element parent)

Return an ElementIterator over all child elements.

Parameters:

parent -

Returns:

See Also:

for a method that only retrieves child elements that match a specific local name and namespace.

getFirstChildElement

public static Element getFirstChildElement(Node parent)

Return the first child element

Returns:

the first child element or null if the given node has no child elements.

hasContent

public static boolean hasContent(Node parent)

Return true if the given parent contains any child that is either an Element, Text or CDATA.

Parameters:

parent -

Returns:

true if the given parent contains any child that is either an Element, Text or CDATA.

getContent

public static List<Node> getContent(Node parent)

Return a list of all child nodes that are either Element, Text or CDATA.

Parameters:

parent -

Returns:

a list of all child nodes that are either Element, Text or CDATA.

getNamespace

public static Namespace getNamespace(Element element)

Build a Namespace from the prefix and uri retrieved from the given element.

Returns:

the Namespace of the given element.

matches

public static boolean matches(Node node,
                              String requiredLocalName,
                              Namespace requiredNamespace)

Returns true if the specified node matches the required names. Note, that that tests return true if the required name is null.

Parameters:

node -

requiredLocalName -

requiredNamespace -

Returns:

true if local name and namespace match the corresponding properties of the given DOM node.

matches

public static boolean matches(Node node,
                              QName requiredName)

Returns true if the specified node matches the required QName.

Parameters:

node -

requiredName -

Returns:

true if local name and namespace match the corresponding properties of the given DOM node.

createElement

public static Element createElement(Document factory,
                                    String localName,
                                    Namespace namespace)

Create a new DOM element with the specified local name and namespace.

Parameters:

factory -

localName -

namespace -

Returns:

a new DOM element

See Also:

Document.createElement(String), Document.createElementNS(String, String)

createElement

public static Element createElement(Document factory,
                                    String localName,
                                    Namespace namespace,
                                    String text)

Create a new DOM element with the specified local name and namespace and add the specified text as Text node to it.

Parameters:

factory -

localName -

namespace -

text -

Returns:

a new DOM element

See Also:

Document.createElement(String), Document.createElementNS(String, String), Document.createTextNode(String), Node.appendChild(org.w3c.dom.Node)

addChildElement

public static Element addChildElement(Element parent,
                                      String localName,
                                      Namespace namespace)

Add a new child element with the given local name and namespace to the specified parent.

Parameters:

parent -

localName -

namespace -

Returns:

the new element that was attached to the given parent.

addChildElement

public static Element addChildElement(Node parent,
                                      String localName,
                                      Namespace namespace)

Add a new child element with the given local name and namespace to the specified parent.

Parameters:

parent -

localName -

namespace -

Returns:

the new element that was attached to the given parent.

addChildElement

public static Element addChildElement(Element parent,
                                      String localName,
                                      Namespace namespace,
                                      String text)

Add a new child element with the given local name and namespace to the specified parent. The specified text is added as Text node to the created child element.

Parameters:

parent -

localName -

namespace -

text -

Returns:

child element that was added to the specified parent

See Also:

Document.createElement(String), Document.createElementNS(String, String), Document.createTextNode(String), Node.appendChild(org.w3c.dom.Node)

setText

public static void setText(Element element,
                           String text)

Create a new text node and add it as child to the given element.

Parameters:

element -

text -

setAttribute

public static void setAttribute(Element element,
                                String attrLocalName,
                                Namespace attrNamespace,
                                String attrValue)

Add an attribute node to the given element.

Parameters:

element -

attrLocalName -

attrNamespace -

attrValue -

setNamespaceAttribute

public static void setNamespaceAttribute(Element element,
                                         String prefix,
                                         String uri)

Adds a namespace attribute on the given element.

Parameters:

element -

prefix -

uri -

timeoutToXml

public static Element timeoutToXml(long timeout,
                                   Document factory)

Converts the given timeout (long value defining the number of milli- second until timeout is reached) to its Xml representation as defined by RFC 4918.

Parameters:

timeout - number of milli-seconds until timeout is reached.

Returns:

'timeout' Xml element

depthToXml

public static Element depthToXml(boolean isDeep,
                                 Document factory)

Returns the Xml representation of a boolean isDeep, where false presents a depth value of '0', true a depth value of 'infinity'.

Parameters:

isDeep -

Returns:

Xml representation

depthToXml

public static Element depthToXml(String depth,
                                 Document factory)

Returns the Xml representation of a depth String. Webdav defines the following valid values for depths: 0, 1, infinity

Parameters:

depth -

Returns:

'deep' XML element

hrefToXml

public static Element hrefToXml(String href,
                                Document factory)

Builds a 'DAV:href' Xml element from the given href. Please note, that the path present in the given String should be properly escaped in order to prevent problems with WebDAV clients.

Parameters:

href - String representing the text of the 'href' Xml element

factory - the Document used as factory

Returns:

Xml representation of a 'href' according to RFC 2518.

getQualifiedName

public static String getQualifiedName(String localName,
                                      Namespace namespace)

Deprecated. As of 2.0. Please use getExpandedName(String, Namespace) instead. This method was named according to usage of 'qualified name' in JSR 170 that conflicts with the terminology used in XMLNS. As of JCR 2.0 the String consisting of "{" + namespace uri + "}" + localName is called Expanded Name.

Same as getExpandedName(String, Namespace).

Parameters:

localName -

namespace -

Returns:

the expanded name of a DOM node consisting of "{" + namespace uri + "}" + localName. If the specified namespace is null or represents the empty namespace, the local name is returned.

getExpandedName

public static String getExpandedName(String localName,
                                     Namespace namespace)

Returns a string representation of the name of a DOM node consisting of "{" + namespace uri + "}" + localName. If the specified namespace is null or represents the empty namespace, the local name is returned.

Parameters:

localName -

namespace -

Returns:

String representation of the name of a DOM node consisting of "{" + namespace uri + "}" + localName. If the specified namespace is null or represents the empty namespace, the local name is returned.

Since:

2.0 Replaces the deprecated method getQualifiedName(String, Namespace).

getPrefixedName

public static String getPrefixedName(String localName,
                                     Namespace namespace)

Return the qualified name of a DOM node consisting of namespace prefix + ":" + local name. If the specified namespace is null or contains an empty prefix, the local name is returned.
NOTE, that this is the value to be used for the 'qualified Name' parameter expected with the namespace sensitive factory methods.

Parameters:

localName -

namespace -

Returns:

qualified name consisting of prefix, ':' and local name.

See Also:

Document.createAttributeNS(String, String), Document.createElementNS(String, String)

transformDocument

public static void transformDocument(Document xmlDoc,
                                     Writer writer)
                              throws TransformerException,
                                     SAXException

Uses a new Transformer instance to transform the specified xml document to the specified writer output target.

Parameters:

xmlDoc - XML document to create the transformation Source for.

writer - The writer used to create a new transformation Result for.

Throws:

TransformerException

SAXException

transformDocument

public static void transformDocument(Document xmlDoc,
                                     OutputStream out)
                              throws TransformerException,
                                     SAXException

Uses a new Transformer instance to transform the specified xml document to the specified writer output target.

Parameters:

xmlDoc - XML document to create the transformation Source for.

out - The stream used to create a new transformation Result for.

Throws:

TransformerException

SAXException