org.jaxen

Class Context

public class Context extends Object implements Serializable

Wrapper around implementation-specific objects used as the context of an expression evaluation.

NOTE: This class is not typically used directly, but is exposed for writers of implementation-specific XPath packages.

The Context bundles utilities together for evaluation of the expression. It wraps the provided objects for ease-of-passage through the expression AST.

Author: bob mcwhirter

Field Summary
ContextSupport	contextSupport Context-support
List	nodeSet Context node-set
int	position Current context position
static long	serialVersionUID
int	size Current context size

Constructor Summary
	Context(ContextSupport contextSupport) Create a new context.

Method Summary
Context	duplicate() Create a type-safe shallow copy.
ContextSupport	getContextSupport() Retrieve the `ContextSupport`.
Function	getFunction(String namespaceURI, String prefix, String localName) Retrieve a `Function`.
Navigator	getNavigator() Retrieve the current `Navigator`.
List	getNodeSet() Retrieve the context node-set.
int	getPosition() Retrieve current position in the context node-set.
int	getSize() Retrieve the size of the current context node-set.
Object	getVariableValue(String namespaceURI, String prefix, String localName) Retrieve a variable value.
void	setContextSupport(ContextSupport contextSupport) Set the `ContextSupport`.
void	setNodeSet(List nodeSet) Set the context node-set, and sets the current context size to the size of this node-set.
void	setPosition(int position) Set the current position in the context node-set.
void	setSize(int size) Set the current size in the context node-set.
String	translateNamespacePrefixToUri(String prefix) Translate a namespace prefix to its URI.

Field Detail

contextSupport

private ContextSupport contextSupport

Context-support

nodeSet

private List nodeSet

Context node-set

position

private int position

Current context position

serialVersionUID

private static final long serialVersionUID

size

private int size

Current context size

Constructor Detail

Context

public Context(ContextSupport contextSupport)

Create a new context.

Parameters: contextSupport the context-support

Method Detail

duplicate

public Context duplicate()

Create a type-safe shallow copy.

Returns: the duplicate

getContextSupport

public ContextSupport getContextSupport()

Retrieve the ContextSupport.

Returns: the context-support

getFunction

public Function getFunction(String namespaceURI, String prefix, String localName)

Retrieve a Function.

Parameters: namespaceURI the function namespace URI prefix the function prefix localName the function name

Returns: the function object

Throws: UnresolvableException if unable to locate a bound function

getNavigator

public Navigator getNavigator()

Retrieve the current Navigator.

Returns: the navigator

getNodeSet

public List getNodeSet()

Retrieve the context node-set. This is a live list. It is not a copy. Do not modify it.

Returns: the context node-set

getPosition

public int getPosition()

Retrieve current position in the context node-set.

Returns: the current position

getSize

public int getSize()

Retrieve the size of the current context node-set.

Returns: the size

getVariableValue

public Object getVariableValue(String namespaceURI, String prefix, String localName)

Retrieve a variable value.

Parameters: namespaceURI the function namespace URI prefix the function prefix localName the function name

Returns: the variable value

Throws: UnresolvableException if unable to locate a bound variable

setContextSupport

public void setContextSupport(ContextSupport contextSupport)

Set the ContextSupport.

Parameters: contextSupport the context-support

setNodeSet

public void setNodeSet(List nodeSet)

Set the context node-set, and sets the current context size to the size of this node-set.

The actual list is stored in this object. A copy is not made. This list should not be modified in other code after calling this method.

After invoking this method, the client should immediately call {@link #setSize(int) setSize} and {@link #setPosition(int) setPosition}.

Parameters: nodeSet the context node-set

setPosition

public void setPosition(int position)

Set the current position in the context node-set.

Parameters: position the position

setSize

public void setSize(int size)

Set the current size in the context node-set.

Parameters: size the size

translateNamespacePrefixToUri

public String translateNamespacePrefixToUri(String prefix)

Translate a namespace prefix to its URI.

Parameters: prefix the prefix

Returns: the namespace URI mapped to the prefix