Package org.apache.commons.jxpath.ri

Class JXPathCompiledExpression

java.lang.Object

org.apache.commons.jxpath.ri.JXPathCompiledExpression

All Implemented Interfaces:

CompiledExpression

public class JXPathCompiledExpression
extends java.lang.Object
implements CompiledExpression

RI of CompiledExpression.

Version:

$Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $

Author:

Dmitri Plotnikov

Field Summary

Fields

Modifier and Type	Field	Description
private Expression	expression
private java.lang.String	xpath

Constructor Summary

Constructors

Constructor	Description
JXPathCompiledExpression(java.lang.String xpath, Expression expression)	Create a new JXPathCompiledExpression.

Method Summary

Modifier and Type	Method	Description
Pointer	createPath(JXPathContext context)	Creates intermediate elements of the path by invoking an AbstractFactory, which should first be installed on the context by calling JXPathContext.setFactory(org.apache.commons.jxpath.AbstractFactory).
Pointer	createPathAndSetValue(JXPathContext context, java.lang.Object value)	The same as setValue, except it creates intermediate elements of the path by invoking an AbstractFactory, which should first be installed on the context by calling JXPathContext.setFactory(org.apache.commons.jxpath.AbstractFactory).
protected Expression	getExpression()	Get the compiled expression.
Pointer	getPointer(JXPathContext context, java.lang.String xpath)	Traverses the xpath and returns a Pointer.
java.lang.Object	getValue(JXPathContext context)	Evaluates the xpath and returns the resulting object.
java.lang.Object	getValue(JXPathContext context, java.lang.Class requiredType)	Evaluates the xpath, converts the result to the specified class and returns the resulting object.
protected java.lang.String	getXPath()	Get the source expression.
java.util.Iterator	iterate(JXPathContext context)	Traverses the xpath and returns a Iterator of all results found for the path.
java.util.Iterator	iteratePointers(JXPathContext context)	Traverses the xpath and returns an Iterator of Pointers.
void	removeAll(JXPathContext context)	Remove all graph elements described by this expression.
void	removePath(JXPathContext context)	Remove the graph element described by this expression.
void	setValue(JXPathContext context, java.lang.Object value)	Modifies the value of the property described by the supplied xpath.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

xpath

private java.lang.String xpath

expression

private Expression expression

Constructor Detail

JXPathCompiledExpression

public JXPathCompiledExpression(java.lang.String xpath,
                                Expression expression)

Create a new JXPathCompiledExpression.

Parameters:

xpath - source

expression - compiled

Method Detail

getXPath

protected java.lang.String getXPath()

Get the source expression.

Returns:

String

getExpression

protected Expression getExpression()

Get the compiled expression.

Returns:

Expression

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getValue

public java.lang.Object getValue(JXPathContext context)

Description copied from interface: CompiledExpression

Evaluates the xpath and returns the resulting object. Primitive types are wrapped into objects.

Specified by:

getValue in interface CompiledExpression

Parameters:

context - to evaluate

Returns:

Object

getValue

public java.lang.Object getValue(JXPathContext context,
                                 java.lang.Class requiredType)

Description copied from interface: CompiledExpression

Evaluates the xpath, converts the result to the specified class and returns the resulting object.

Specified by:

getValue in interface CompiledExpression

Parameters:

context - to evaluate

requiredType - return type

Returns:

Object

setValue

public void setValue(JXPathContext context,
                     java.lang.Object value)

Description copied from interface: CompiledExpression

Modifies the value of the property described by the supplied xpath. Will throw an exception if one of the following conditions occurs:

• The xpath does not in fact describe an existing property
• The property is not writable (no public, non-static set method)

Specified by:

setValue in interface CompiledExpression

Parameters:

context - base

value - to set

createPath

public Pointer createPath(JXPathContext context)

Description copied from interface: CompiledExpression

Creates intermediate elements of the path by invoking an AbstractFactory, which should first be installed on the context by calling JXPathContext.setFactory(org.apache.commons.jxpath.AbstractFactory).

Specified by:

createPath in interface CompiledExpression

Parameters:

context - base

Returns:

Pointer created

createPathAndSetValue

public Pointer createPathAndSetValue(JXPathContext context,
                                     java.lang.Object value)

Description copied from interface: CompiledExpression

The same as setValue, except it creates intermediate elements of the path by invoking an AbstractFactory, which should first be installed on the context by calling JXPathContext.setFactory(org.apache.commons.jxpath.AbstractFactory).

Will throw an exception if one of the following conditions occurs:

• Elements of the xpath aleady exist, by the path does not in fact describe an existing property
• The AbstractFactory fails to create an instance for an intermediate element.
• The property is not writable (no public, non-static set method)

Specified by:

createPathAndSetValue in interface CompiledExpression

Parameters:

context - base

value - to set

Returns:

Pointer created

iterate

public java.util.Iterator iterate(JXPathContext context)

Description copied from interface: CompiledExpression

Traverses the xpath and returns a Iterator of all results found for the path. If the xpath matches no properties in the graph, the Iterator will not be null.

Specified by:

iterate in interface CompiledExpression

Parameters:

context - base

Returns:

Iterator

getPointer

public Pointer getPointer(JXPathContext context,
                          java.lang.String xpath)

Description copied from interface: CompiledExpression

Traverses the xpath and returns a Pointer. A Pointer provides easy access to a property. If the xpath matches no properties in the graph, the pointer will be null.

Specified by:

getPointer in interface CompiledExpression

Parameters:

context - base

xpath - string

Returns:

Pointer found

iteratePointers

public java.util.Iterator iteratePointers(JXPathContext context)

Description copied from interface: CompiledExpression

Traverses the xpath and returns an Iterator of Pointers. A Pointer provides easy access to a property. If the xpath matches no properties in the graph, the Iterator be empty, but not null.

Specified by:

iteratePointers in interface CompiledExpression

Parameters:

context - to iterate

Returns:

Iterator

removePath

public void removePath(JXPathContext context)

Description copied from interface: CompiledExpression

Remove the graph element described by this expression.

Specified by:

removePath in interface CompiledExpression

Parameters:

context - base

removeAll

public void removeAll(JXPathContext context)

Description copied from interface: CompiledExpression

Remove all graph elements described by this expression.

Specified by:

removeAll in interface CompiledExpression

Parameters:

context - base