Package org.jaxen
Class Context
java.lang.Object
org.jaxen.Context
- All Implemented Interfaces:
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.
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionCreate a type-safe shallow copy.Retrieve theContextSupport
.getFunction
(String namespaceURI, String prefix, String localName) Retrieve aFunction
.Retrieve the currentNavigator
.Retrieve the context node-set.int
Retrieve current position in the context node-set.int
getSize()
Retrieve the size of the current context node-set.getVariableValue
(String namespaceURI, String prefix, String localName) Retrieve a variable value.void
setContextSupport
(ContextSupport contextSupport) Set theContextSupport
.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.translateNamespacePrefixToUri
(String prefix) Translate a namespace prefix to its URI.
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Constructor Details
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Context
Create a new context.- Parameters:
contextSupport
- the context-support
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Method Details
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setNodeSet
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
setSize
andsetPosition
.- Parameters:
nodeSet
- the context node-set
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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
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setContextSupport
Set theContextSupport
.- Parameters:
contextSupport
- the context-support
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getContextSupport
Retrieve theContextSupport
.- Returns:
- the context-support
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translateNamespacePrefixToUri
Translate a namespace prefix to its URI.- Parameters:
prefix
- the prefix- Returns:
- the namespace URI mapped to the prefix
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getVariableValue
public Object getVariableValue(String namespaceURI, String prefix, String localName) throws UnresolvableException Retrieve a variable value.- Parameters:
namespaceURI
- the function namespace URIprefix
- the function prefixlocalName
- the function name- Returns:
- the variable value
- Throws:
UnresolvableException
- if unable to locate a bound variable
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getFunction
public Function getFunction(String namespaceURI, String prefix, String localName) throws UnresolvableException Retrieve aFunction
.- Parameters:
namespaceURI
- the function namespace URIprefix
- the function prefixlocalName
- the function name- Returns:
- the function object
- Throws:
UnresolvableException
- if unable to locate a bound function
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setSize
public void setSize(int size) Set the current size in the context node-set.- Parameters:
size
- the size
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getSize
public int getSize()Retrieve the size of the current context node-set.- Returns:
- the size
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setPosition
public void setPosition(int position) Set the current position in the context node-set.- Parameters:
position
- the position
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getPosition
public int getPosition()Retrieve current position in the context node-set.- Returns:
- the current position
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duplicate
Create a type-safe shallow copy.- Returns:
- the duplicate
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