public abstract class AbstractNode extends Object implements Node, Cloneable, Serializable
AbstractNode
is an abstract base class for
tree implementors to use for implementation inheritence.
Modifier and Type | Field and Description |
---|---|
private static DocumentFactory |
DOCUMENT_FACTORY
The
DocumentFactory instance used by default |
protected static String[] |
NODE_TYPE_NAMES |
ANY_NODE, ATTRIBUTE_NODE, CDATA_SECTION_NODE, COMMENT_NODE, DOCUMENT_NODE, DOCUMENT_TYPE_NODE, ELEMENT_NODE, ENTITY_REFERENCE_NODE, MAX_NODE_TYPE, NAMESPACE_NODE, PROCESSING_INSTRUCTION_NODE, TEXT_NODE, UNKNOWN_NODE
Constructor and Description |
---|
AbstractNode() |
Modifier and Type | Method and Description |
---|---|
Node |
asXPathResult(Element parent)
asXPathResult returns a version of this node which is
capable of being an XPath result. |
Object |
clone()
clone will return a deep clone or if this node is
read-only then clone will return the same instance. |
Pattern |
createPattern(String patternText) |
XPath |
createXPath(String xpathExpression)
createXPath creates an XPath object for
the given xpathExpression. |
NodeFilter |
createXPathFilter(String patternText) |
protected Node |
createXPathResult(Element parent) |
Node |
detach()
Removes this node from its parent if there is one.
|
Document |
getDocument()
getDocument returns the Document
that this Node is part of if this node supports
the parent relationship. |
protected DocumentFactory |
getDocumentFactory() |
String |
getName()
getName returns the name of this node. |
short |
getNodeType()
Returns the code according to the type of node.
|
String |
getNodeTypeName() |
Element |
getParent()
getParent returns the parent Element
if this node supports the parent relationship or null if it is
the root element or does not support the parent relationship. |
String |
getPath()
Returns the XPath expression which will return a node set
containing the given node such as /a/b/@c.
|
String |
getStringValue()
Returns the XPath string-value of this node.
|
String |
getText()
Returns the text of this node.
|
String |
getUniquePath()
Returns the XPath expression which will return a nodeset
of one node which is the current node.
|
boolean |
hasContent()
hasContent returns true if this node is a Branch
(either an Element or a Document) and it contains at least one
content node such as a child Element or Text node. |
boolean |
isReadOnly()
isReadOnly returns true if this node is read only
and cannot be modified. |
boolean |
matches(String patternText)
matches returns true if evaluating the given
XPath expression on this node returns true or a non-empty node set. |
Number |
numberValueOf(String xpathExpression)
numberValueOf evaluates an XPath expression
and returns the numeric value of the XPath expression if the XPath
expression results in a number, or null if the result is not a number. |
List |
selectNodes(String xpathExpression)
selectNodes evaluates an XPath expression and returns
the result as a List of Node instances or
String instances depending on the XPath expression. |
List |
selectNodes(String xpathExpression,
String comparisonXPathExpression)
selectNodes evaluates an XPath expression then
sorts the results using a secondary XPath expression
Returns a sorted List of Node instances. |
List |
selectNodes(String xpathExpression,
String comparisonXPathExpression,
boolean removeDuplicates)
selectNodes evaluates an XPath expression then
sorts the results using a secondary XPath expression
Returns a sorted List of Node instances. |
Object |
selectObject(String xpathExpression)
selectObject evaluates an XPath expression and returns
the result as an Object . |
Node |
selectSingleNode(String xpathExpression)
selectSingleNode evaluates an XPath expression
and returns the result as a single Node instance. |
void |
setDocument(Document document)
setDocument sets the document of this node if the
parent relationship is supported or does nothing if the parent
relationship is not supported. |
void |
setName(String name)
Sets the text data of this node or this method will
throw an
UnsupportedOperationException if it is
read-only. |
void |
setParent(Element parent)
setParent sets the parent relationship of
this node if the parent relationship is supported or does nothing
if the parent relationship is not supported. |
void |
setText(String text)
Sets the text data of this node or this method will
throw an
UnsupportedOperationException if it is
read-only. |
boolean |
supportsParent()
supportsParent returns true if this node supports the
parent relationship. |
String |
valueOf(String xpathExpression)
valueOf evaluates an XPath expression
and returns the textual representation of the results the XPath
string-value of this node. |
void |
write(Writer writer)
write writes this node as the default XML
notation for this node. |
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
accept, asXML, getPath, getUniquePath
protected static final String[] NODE_TYPE_NAMES
private static final DocumentFactory DOCUMENT_FACTORY
DocumentFactory
instance used by defaultpublic AbstractNode()
public short getNodeType()
Node
getNodeType
in interface Node
public String getNodeTypeName()
getNodeTypeName
in interface Node
public Document getDocument()
Node
getDocument
returns the Document
that this Node
is part of if this node supports
the parent relationship.
This method is an optional feature and may not be supported
for all Node
implementations.
getDocument
in interface Node
Document
public void setDocument(Document document)
Node
setDocument
sets the document of this node if the
parent relationship is supported or does nothing if the parent
relationship is not supported.
This method should only be called from inside a
Document
implementation method and is not intended for
general use.
setDocument
in interface Node
document
- is the new document of this node.public Element getParent()
Node
getParent
returns the parent Element
if this node supports the parent relationship or null if it is
the root element or does not support the parent relationship.
This method is an optional feature and may not be supported
for all Node
implementations.
public void setParent(Element parent)
Node
setParent
sets the parent relationship of
this node if the parent relationship is supported or does nothing
if the parent relationship is not supported.
This method should only be called from inside an
Element
implementation method and is not intended for
general use.
public boolean supportsParent()
Node
supportsParent
returns true if this node supports the
parent relationship.
Some XML tree implementations are singly linked and only support downward navigation through children relationships. The default case is that both parent and children relationships are supported though for memory and performance reasons the parent relationship may not be supported.
supportsParent
in interface Node
public boolean isReadOnly()
Node
isReadOnly
returns true if this node is read only
and cannot be modified.
Any attempt to modify a read-only Node
will result in
an UnsupportedOperationException
being thrown.
isReadOnly
in interface Node
Node
is read only
and cannot be modified otherwise false.public boolean hasContent()
Node
hasContent
returns true if this node is a Branch
(either an Element or a Document) and it contains at least one
content node such as a child Element or Text node.
hasContent
in interface Node
Node
is a Branch
with a nodeCount() of one or more.public String getPath()
Node
Returns the XPath expression which will return a node set containing the given node such as /a/b/@c. No indexing will be used to restrict the path if multiple elements with the same name occur on the path.
public String getUniquePath()
Node
Returns the XPath expression which will return a nodeset of one node which is the current node. This method will use the XPath index operator to restrict the path if multiple elements with the same name occur on the path.
getUniquePath
in interface Node
public Object clone()
Node
clone
will return a deep clone or if this node is
read-only then clone will return the same instance.
public Node detach()
Node
Removes this node from its parent if there is one. If this node is the root element of a document then it is removed from the document as well.
This method is useful if you want to remove a node from its source document and add it to another document. For example
Node node = ...;
Element someOtherElement = ...;
someOtherElement.add( node.detach() );
public String getName()
Node
getName
returns the name of this node.
This is the XML local name of the element, attribute, entity or
processing instruction.
For CDATA and Text nodes this method will return null.
public void setName(String name)
Node
Sets the text data of this node or this method will
throw an UnsupportedOperationException
if it is
read-only.
public String getText()
Node
Returns the text of this node.
public String getStringValue()
Node
getStringValue
in interface Node
public void setText(String text)
Node
Sets the text data of this node or this method will
throw an UnsupportedOperationException
if it is
read-only.
public void write(Writer writer) throws IOException
Node
write
writes this node as the default XML
notation for this node. If you wish to control the XML output
(such as for pretty printing, changing the indentation policy etc.)
then please use XMLWriter
or its derivations.
write
in interface Node
writer
- is the Writer
to output the XML toIOException
public Object selectObject(String xpathExpression)
Node
public List selectNodes(String xpathExpression)
Node
selectNodes
evaluates an XPath expression and returns
the result as a List
of Node
instances or
String
instances depending on the XPath expression.
selectNodes
in interface Node
xpathExpression
- is the XPath expression to be evaluatedNode
or String
instances
depending on the XPath expressionpublic List selectNodes(String xpathExpression, String comparisonXPathExpression)
Node
selectNodes
evaluates an XPath expression then
sorts the results using a secondary XPath expression
Returns a sorted List
of Node
instances.
selectNodes
in interface Node
xpathExpression
- is the XPath expression to be evaluatedcomparisonXPathExpression
- is the XPath expression used
to compare the results by for sortingNode
instances
sorted by the comparisonXPathExpressionpublic List selectNodes(String xpathExpression, String comparisonXPathExpression, boolean removeDuplicates)
Node
selectNodes
evaluates an XPath expression then
sorts the results using a secondary XPath expression
Returns a sorted List
of Node
instances.
selectNodes
in interface Node
xpathExpression
- is the XPath expression to be evaluatedcomparisonXPathExpression
- is the XPath expression used
to compare the results by for sortingremoveDuplicates
- if this parameter is true then duplicate
values (using the comparisonXPathExpression) are removed from
the result List.Node
instances
sorted by the comparisonXPathExpressionpublic Node selectSingleNode(String xpathExpression)
Node
selectSingleNode
evaluates an XPath expression
and returns the result as a single Node
instance.
selectSingleNode
in interface Node
xpathExpression
- is the XPath expression to be evaluatedNode
matching the XPath expressionpublic String valueOf(String xpathExpression)
Node
valueOf
evaluates an XPath expression
and returns the textual representation of the results the XPath
string-value of this node.
The string-value for a given node type is defined in the
XPath specification.
public Number numberValueOf(String xpathExpression)
Node
numberValueOf
evaluates an XPath expression
and returns the numeric value of the XPath expression if the XPath
expression results in a number, or null if the result is not a number.
numberValueOf
in interface Node
xpathExpression
- is the XPath expression to be evaluatedpublic boolean matches(String patternText)
Node
matches
returns true if evaluating the given
XPath expression on this node returns true or a non-empty node set.
So calling this method is equivalent to calling
<xsl:if test="xpathExpression"/>
in XSLT.
public XPath createXPath(String xpathExpression)
Node
createXPath
creates an XPath object for
the given xpathExpression.
The XPath object allows the variable context to be specified.
createXPath
in interface Node
xpathExpression
- is the XPath expression to be evaluatedpublic NodeFilter createXPathFilter(String patternText)
public Pattern createPattern(String patternText)
public Node asXPathResult(Element parent)
Node
asXPathResult
returns a version of this node which is
capable of being an XPath result.
The result of an XPath expression should always support the parent
relationship, whether the original XML tree was singly or doubly linked.
If the node does not support the parent relationship then a new node
will be created which is linked to its parent and returned.
asXPathResult
in interface Node
Node
which supports the parent relationshipprotected DocumentFactory getDocumentFactory()
protected Node createXPathResult(Element parent)
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