Package org.custommonkey.xmlunit

Class DifferenceEngine

java.lang.Object

org.custommonkey.xmlunit.DifferenceEngine

All Implemented Interfaces:

DifferenceConstants, DifferenceEngineContract

public class DifferenceEngine
extends Object
implements DifferenceConstants, DifferenceEngineContract

Class that has responsibility for comparing Nodes and notifying a DifferenceListener of any differences or dissimilarities that are found. Knows how to compare namespaces and nested child nodes, but currently only compares nodes of type ELEMENT_NODE, CDATA_SECTION_NODE, COMMENT_NODE, DOCUMENT_TYPE_NODE, PROCESSING_INSTRUCTION_NODE and TEXT_NODE. Nodes of other types (eg ENTITY_NODE) will be skipped.

See Also:

• DifferenceListener.differenceFound(Difference)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static final class	DifferenceEngine.DifferenceFoundException	Marker exception thrown by the protected compare() method and passed upwards through the call stack to the public compare() method.

Field Summary

Fields inherited from interface org.custommonkey.xmlunit.DifferenceConstants

ATTR_NAME_NOT_FOUND, ATTR_NAME_NOT_FOUND_ID, ATTR_SEQUENCE, ATTR_SEQUENCE_ID, ATTR_VALUE, ATTR_VALUE_EXPLICITLY_SPECIFIED, ATTR_VALUE_EXPLICITLY_SPECIFIED_ID, ATTR_VALUE_ID, CDATA_VALUE, CDATA_VALUE_ID, CHILD_NODE_NOT_FOUND, CHILD_NODE_NOT_FOUND_ID, CHILD_NODELIST_LENGTH, CHILD_NODELIST_LENGTH_ID, CHILD_NODELIST_SEQUENCE, CHILD_NODELIST_SEQUENCE_ID, COMMENT_VALUE, COMMENT_VALUE_ID, DOCTYPE_NAME, DOCTYPE_NAME_ID, DOCTYPE_PUBLIC_ID, DOCTYPE_PUBLIC_ID_ID, DOCTYPE_SYSTEM_ID, DOCTYPE_SYSTEM_ID_ID, ELEMENT_NUM_ATTRIBUTES, ELEMENT_NUM_ATTRIBUTES_ID, ELEMENT_TAG_NAME, ELEMENT_TAG_NAME_ID, HAS_CHILD_NODES, HAS_CHILD_NODES_ID, HAS_DOCTYPE_DECLARATION, HAS_DOCTYPE_DECLARATION_ID, NAMESPACE_PREFIX, NAMESPACE_PREFIX_ID, NAMESPACE_URI, NAMESPACE_URI_ID, NO_NAMESPACE_SCHEMA_LOCATION, NO_NAMESPACE_SCHEMA_LOCATION_ID, NODE_TYPE, NODE_TYPE_ID, PROCESSING_INSTRUCTION_DATA, PROCESSING_INSTRUCTION_DATA_ID, PROCESSING_INSTRUCTION_TARGET, PROCESSING_INSTRUCTION_TARGET_ID, SCHEMA_LOCATION, SCHEMA_LOCATION_ID, TEXT_VALUE, TEXT_VALUE_ID

Constructor Summary

Constructors

Constructor	Description
DifferenceEngine(ComparisonController controller)	Simple constructor that uses no MatchTracker at all.
DifferenceEngine(ComparisonController controller, MatchTracker matchTracker)	Simple constructor

Method Summary

Modifier and Type	Method	Description
protected void	compare(Object expected, Object actual, Node control, Node test, DifferenceListener listener, Difference difference)	If the expected and actual values are unequal then inform the listener of a difference and throw a DifferenceFoundException.
protected void	compare(Object expected, Object actual, Node control, Node test, DifferenceListener listener, Difference difference, XpathNodeTracker controlLoc, XpathNodeTracker testLoc)	If the expected and actual values are unequal then inform the listener of a difference and throw a DifferenceFoundException.
void	compare(Node control, Node test, DifferenceListener listener, ElementQualifier elementQualifier)	Entry point for Node comparison testing.
protected void	compareAttribute(Attr control, Attr test, DifferenceListener listener)	Compare two attributes
protected void	compareCDataSection(CDATASection control, CDATASection test, DifferenceListener listener)	Compare two CDATA sections - unused, kept for backwards compatibility
protected void	compareComment(Comment control, Comment test, DifferenceListener listener)	Compare two comments
protected void	compareDocument(Document control, Document test, DifferenceListener listener, ElementQualifier elementQualifier)	Compare two Documents for doctype and then element differences
protected void	compareDocumentType(DocumentType control, DocumentType test, DifferenceListener listener)	Compare two DocumentType nodes
protected void	compareElement(Element control, Element test, DifferenceListener listener)	Compare 2 elements and their attributes
protected void	compareHasChildNodes(Node control, Node test, DifferenceListener listener)	Compare the number of children, and if the same, compare the actual children via their NodeLists.
protected void	compareNode(Node control, Node test, DifferenceListener listener, ElementQualifier elementQualifier)	First point of call: if nodes are comparable it compares node values then recurses to compare node children.
protected boolean	compareNodeBasics(Node control, Node test, DifferenceListener listener)	Compares node type and node namespace characteristics: basically determines if nodes are comparable further
protected void	compareNodeChildren(Node control, Node test, DifferenceListener listener, ElementQualifier elementQualifier)	Compare the number of children, and if the same, compare the actual children via their NodeLists.
protected void	compareNodeList(List<Node> controlChildren, List<Node> testChildren, int numNodes, DifferenceListener listener, ElementQualifier elementQualifier)	Compare the contents of two node list one by one, assuming that order of children is NOT important: matching begins at same position in test list as control list.
protected void	compareProcessingInstruction(ProcessingInstruction control, ProcessingInstruction test, DifferenceListener listener)	Compare two processing instructions
protected void	compareRecognizedXMLSchemaInstanceAttribute(Attr control, Attr test, DifferenceListener listener)	Compare two attributes
protected void	compareText(CharacterData control, CharacterData test, DifferenceListener listener)	Compare text
protected void	compareText(Text control, Text test, DifferenceListener listener)	Compare text - unused, kept for backwards compatibility
void	setMatchTracker(MatchTracker matchTracker)

Methods inherited from class java.lang.Object

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

Constructor Details

DifferenceEngine

public DifferenceEngine(ComparisonController controller)

Simple constructor that uses no MatchTracker at all.

Parameters:

controller - the instance used to determine whether a Difference detected by this class should halt further comparison or not

See Also:

• ComparisonController.haltComparison(Difference)

DifferenceEngine

public DifferenceEngine(ComparisonController controller,
 MatchTracker matchTracker)

Simple constructor

Parameters:

controller - the instance used to determine whether a Difference detected by this class should halt further comparison or not

matchTracker - the instance that is notified on each successful match. May be null.

See Also:

• ComparisonController.haltComparison(Difference)
• MatchTracker.matchFound(Difference)

Method Details

setMatchTracker

public void setMatchTracker(MatchTracker matchTracker)

Specified by:

setMatchTracker in interface DifferenceEngineContract

Parameters:

matchTracker - the instance that is notified on each successful match. May be null.

compare

public void compare(Node control,
 Node test,
 DifferenceListener listener,
 ElementQualifier elementQualifier)

Entry point for Node comparison testing.

Specified by:

compare in interface DifferenceEngineContract

Parameters:

control - Control XML to compare

test - Test XML to compare

listener - Notified of any differences detected during node comparison testing

elementQualifier - Used to determine which elements qualify for comparison e.g. when a node has repeated child elements that may occur in any sequence and that sequence is not considered important.

compareNode

protected void compareNode(Node control,
 Node test,
 DifferenceListener listener,
 ElementQualifier elementQualifier)
                    throws DifferenceEngine.DifferenceFoundException

First point of call: if nodes are comparable it compares node values then recurses to compare node children.

Parameters:

control - control node

test - test node

listener - difference listener

elementQualifier - element qualifier

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareDocument

protected void compareDocument(Document control,
 Document test,
 DifferenceListener listener,
 ElementQualifier elementQualifier)
                        throws DifferenceEngine.DifferenceFoundException

Compare two Documents for doctype and then element differences

Parameters:

control - control document

test - test document

listener - difference listener

elementQualifier - element qualifier

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareNodeBasics

protected boolean compareNodeBasics(Node control,
 Node test,
 DifferenceListener listener)
                             throws DifferenceEngine.DifferenceFoundException

Compares node type and node namespace characteristics: basically determines if nodes are comparable further

Parameters:

control - control node

test - test node

listener - difference listener

Returns:

true if the nodes are comparable further, false otherwise

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareHasChildNodes

protected void compareHasChildNodes(Node control,
 Node test,
 DifferenceListener listener)
                             throws DifferenceEngine.DifferenceFoundException

Compare the number of children, and if the same, compare the actual children via their NodeLists.

Parameters:

control - control node

test - test node

listener - difference listener

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareNodeChildren

protected void compareNodeChildren(Node control,
 Node test,
 DifferenceListener listener,
 ElementQualifier elementQualifier)
                            throws DifferenceEngine.DifferenceFoundException

Compare the number of children, and if the same, compare the actual children via their NodeLists.

Parameters:

control - control node

test - test node

listener - difference listener

elementQualifier - element qualifier

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareNodeList

protected void compareNodeList(List<Node> controlChildren,
 List<Node> testChildren,
 int numNodes,
 DifferenceListener listener,
 ElementQualifier elementQualifier)
                        throws DifferenceEngine.DifferenceFoundException

Compare the contents of two node list one by one, assuming that order of children is NOT important: matching begins at same position in test list as control list.

Parameters:

controlChildren - children of the control node

testChildren - children of the test node

numNodes - convenience parameter because the calling method should know the value already

listener - difference listener

elementQualifier - used to determine which of the child elements in the test NodeList should be compared to the current child element in the control NodeList.

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareElement

protected void compareElement(Element control,
 Element test,
 DifferenceListener listener)
                       throws DifferenceEngine.DifferenceFoundException

Compare 2 elements and their attributes

Parameters:

control - element

test - test element

listener - difference listener

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareRecognizedXMLSchemaInstanceAttribute

protected void compareRecognizedXMLSchemaInstanceAttribute(Attr control,
 Attr test,
 DifferenceListener listener)
                                                    throws DifferenceEngine.DifferenceFoundException

Compare two attributes

Parameters:

control - control attribute

test - test attribute

listener - difference listener

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareAttribute

protected void compareAttribute(Attr control,
 Attr test,
 DifferenceListener listener)
                         throws DifferenceEngine.DifferenceFoundException

Compare two attributes

Parameters:

control - control attribute

test - test attribute

listener - difference listener

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareCDataSection

protected void compareCDataSection(CDATASection control,
 CDATASection test,
 DifferenceListener listener)
                            throws DifferenceEngine.DifferenceFoundException

Compare two CDATA sections - unused, kept for backwards compatibility

Parameters:

control - control cdata

test - test cdata

listener - difference listener

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareComment

protected void compareComment(Comment control,
 Comment test,
 DifferenceListener listener)
                       throws DifferenceEngine.DifferenceFoundException

Compare two comments

Parameters:

control - control comment

test - test comment

listener - difference listener

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareDocumentType

protected void compareDocumentType(DocumentType control,
 DocumentType test,
 DifferenceListener listener)
                            throws DifferenceEngine.DifferenceFoundException

Compare two DocumentType nodes

Parameters:

control - control document type

test - test document type

listener - difference listener

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareProcessingInstruction

protected void compareProcessingInstruction(ProcessingInstruction control,
 ProcessingInstruction test,
 DifferenceListener listener)
                                     throws DifferenceEngine.DifferenceFoundException

Compare two processing instructions

Parameters:

control - control processing instruction

test - test processing instruction

listener - difference listener

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareText

protected void compareText(Text control,
 Text test,
 DifferenceListener listener)
                    throws DifferenceEngine.DifferenceFoundException

Compare text - unused, kept for backwards compatibility

Parameters:

control - control text

test - test text

listener - difference listener

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compareText

protected void compareText(CharacterData control,
 CharacterData test,
 DifferenceListener listener)
                    throws DifferenceEngine.DifferenceFoundException

Compare text

Parameters:

control - control text

test - test text

listener - difference listener

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compare

protected void compare(Object expected,
 Object actual,
 Node control,
 Node test,
 DifferenceListener listener,
 Difference difference)
                throws DifferenceEngine.DifferenceFoundException

If the expected and actual values are unequal then inform the listener of a difference and throw a DifferenceFoundException.

Parameters:

expected - expected value

actual - value

control - control node

test - test node

listener - difference listener

difference - difference type

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found

compare

protected void compare(Object expected,
 Object actual,
 Node control,
 Node test,
 DifferenceListener listener,
 Difference difference,
 XpathNodeTracker controlLoc,
 XpathNodeTracker testLoc)
                throws DifferenceEngine.DifferenceFoundException

If the expected and actual values are unequal then inform the listener of a difference and throw a DifferenceFoundException.

Parameters:

expected - expected value

actual - value

control - control node

controlLoc - XPath location of control node

test - test node

testLoc - XPath location of test node

listener - difference listener

difference - difference type

Throws:

DifferenceEngine.DifferenceFoundException - if a difference has been found