org.jaxen
Class Context

java.lang.Object
  org.jaxen.Context

All Implemented Interfaces:

java.io.Serializable

public class Context

extends java.lang.Object

implements java.io.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

See Also:

ContextSupport, BaseXPath, XPath for dom4j, XPath for JDOM, XPath for W3C DOM, Serialized Form

Field Summary

private ContextSupport	contextSupport Context-support.
private java.util.List	nodeSet Context node-set.
private int	position Current context position.
private int	size Current context size.

Constructor Summary

Context(ContextSupport contextSupport)
Construct.

Method Summary

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

Methods inherited from class java.lang.Object

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

Field Detail

contextSupport

private ContextSupport contextSupport

Context-support.

nodeSet

private java.util.List nodeSet

Context node-set.

size

private int size

Current context size.

position

private int position

Current context position.

Constructor Detail

Context

public Context(ContextSupport contextSupport)

Construct.

Parameters:

contextSupport - The context-support.

Method Detail

setNodeSet

public void setNodeSet(java.util.List nodeSet)

Set the context node-set.

Parameters:

nodeSet - The context node-set.

getNodeSet

public java.util.List getNodeSet()

Retrieve the context node-set.

Returns:

The context node-set.

setContextSupport

public void setContextSupport(ContextSupport contextSupport)

Set the ContextSupport.

Parameters:

contextSupport - The context-support.

getContextSupport

public ContextSupport getContextSupport()

Retrieve the ContextSupport.

Returns:

The context-support.

getNavigator

public Navigator getNavigator()

Retrieve the current Navigator.

Returns:

The navigator.

translateNamespacePrefixToUri

public java.lang.String translateNamespacePrefixToUri(java.lang.String prefix)

Translate a namespace prefix to its URI.

Parameters:

prefix - The prefix.

Returns:

The naemspace URI mapped to the prefix.

getVariableValue

public java.lang.Object getVariableValue(java.lang.String namespaceURI,
                                         java.lang.String prefix,
                                         java.lang.String localName)
                                  throws UnresolvableException

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.

getFunction

public Function getFunction(java.lang.String namespaceURI,
                            java.lang.String prefix,
                            java.lang.String localName)
                     throws UnresolvableException

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.

setSize

public void setSize(int size)

Set the current size in the context node-set.

Parameters:

size - The size.

getSize

public int getSize()

Retrieve the size of the context node-set.

Returns:

The size.

setPosition

public void setPosition(int position)

Set the current position in the context node-set.

Parameters:

position - The position

getPosition

public int getPosition()

Retrieve current position in the context node-set.

Returns:

The current position.

duplicate

public Context duplicate()

Create a type-safe shallow copy.

Returns:

The duplicate.