/*
******************************************************************
Copyright (c) 2001-2010,2013,2015-2016 Jeff Martin, Tim Bacon
All rights reserved.
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modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
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* Redistributions in binary form must reproduce the above
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with the distribution.
* Neither the name of the XMLUnit nor the names
of its contributors may be used to endorse or promote products
derived from this software without specific prior written
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package org.custommonkey.xmlunit;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.w3c.dom.Attr;
import org.w3c.dom.CharacterData;
import org.w3c.dom.CDATASection;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.ProcessingInstruction;
import org.w3c.dom.Text;
/**
* 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 DifferenceListener#differenceFound(Difference)
*/
public class DifferenceEngine
implements DifferenceConstants, DifferenceEngineContract {
/**
* Exception instance used internally to control flow
* when a difference is found
*/
private static final DifferenceFoundException flowControlException =
new DifferenceFoundException();
private static final String NULL_NODE = "null";
private static final String NOT_NULL_NODE = "not null";
private static final String ATTRIBUTE_ABSENT = "[attribute absent]";
private final ComparisonController controller;
private MatchTracker matchTracker;
private final XpathNodeTracker controlTracker;
private final XpathNodeTracker testTracker;
/**
* Simple constructor that uses no MatchTracker at all.
* @param controller the instance used to determine whether a Difference
* detected by this class should halt further comparison or not
* @see ComparisonController#haltComparison(Difference)
*/
public DifferenceEngine(ComparisonController controller) {
this(controller, null);
}
/**
* Simple constructor
* @param controller the instance used to determine whether a Difference
* detected by this class should halt further comparison or not
* @param matchTracker the instance that is notified on each
* successful match. May be null.
* @see ComparisonController#haltComparison(Difference)
* @see MatchTracker#matchFound(Difference)
*/
public DifferenceEngine(ComparisonController controller,
MatchTracker matchTracker) {
this.controller = controller;
this.matchTracker = matchTracker;
this.controlTracker = new XpathNodeTracker();
this.testTracker = new XpathNodeTracker();
}
/**
* @param matchTracker the instance that is notified on each
* successful match. May be null.
*/
public void setMatchTracker(MatchTracker matchTracker) {
this.matchTracker = matchTracker;
}
/**
* Entry point for Node comparison testing.
* @param control Control XML to compare
* @param test Test XML to compare
* @param listener Notified of any {@link Difference differences} detected
* during node comparison testing
* @param 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.
*/
public void compare(Node control, Node test, DifferenceListener listener,
ElementQualifier elementQualifier) {
controlTracker.reset();
testTracker.reset();
try {
compare(getNullOrNotNull(control), getNullOrNotNull(test),
control, test, listener, NODE_TYPE);
if (control!=null) {
compareNode(control, test, listener, elementQualifier);
}
} catch (DifferenceFoundException e) {
// thrown by the protected compare() method to terminate the
// comparison and unwind the call stack back to here
}
}
private static String getNullOrNotNull(Node aNode) {
return aNode==null ? NULL_NODE : NOT_NULL_NODE;
}
/**
* First point of call: if nodes are comparable it compares node values then
* recurses to compare node children.
* @param control
* @param test
* @param listener
* @param elementQualifier
* @throws DifferenceFoundException
*/
protected void compareNode(Node control, Node test,
DifferenceListener listener, ElementQualifier elementQualifier)
throws DifferenceFoundException {
boolean comparable = compareNodeBasics(control, test, listener);
boolean isDocumentNode = false;
if (comparable) {
switch (control.getNodeType()) {
case Node.ELEMENT_NODE:
compareElement((Element)control, (Element)test, listener);
break;
case Node.CDATA_SECTION_NODE:
case Node.TEXT_NODE:
compareText((CharacterData) control,
(CharacterData) test, listener);
break;
case Node.COMMENT_NODE:
compareComment((Comment)control, (Comment)test, listener);
break;
case Node.DOCUMENT_TYPE_NODE:
compareDocumentType((DocumentType)control,
(DocumentType)test, listener);
break;
case Node.PROCESSING_INSTRUCTION_NODE:
compareProcessingInstruction((ProcessingInstruction)control,
(ProcessingInstruction)test, listener);
break;
case Node.DOCUMENT_NODE:
isDocumentNode = true;
compareDocument((Document)control, (Document) test,
listener, elementQualifier);
break;
default:
listener.skippedComparison(control, test);
}
}
compareHasChildNodes(control, test, listener);
if (isDocumentNode) {
Element controlElement = ((Document)control).getDocumentElement();
Element testElement = ((Document)test).getDocumentElement();
if (controlElement!=null && testElement!=null) {
compareNode(controlElement, testElement, listener, elementQualifier);
}
} else {
controlTracker.indent();
testTracker.indent();
compareNodeChildren(control, test, listener, elementQualifier);
controlTracker.outdent();
testTracker.outdent();
}
}
/**
* Compare two Documents for doctype and then element differences
* @param control
* @param test
* @param listener
* @param elementQualifier
* @throws DifferenceFoundException
*/
protected void compareDocument(Document control, Document test,
DifferenceListener listener, ElementQualifier elementQualifier)
throws DifferenceFoundException {
DocumentType controlDoctype = control.getDoctype();
DocumentType testDoctype = test.getDoctype();
compare(getNullOrNotNull(controlDoctype),
getNullOrNotNull(testDoctype),
controlDoctype, testDoctype, listener,
HAS_DOCTYPE_DECLARATION);
if (controlDoctype!=null && testDoctype!=null) {
compareNode(controlDoctype, testDoctype, listener, elementQualifier);
}
}
/**
* Compares node type and node namespace characteristics: basically
* determines if nodes are comparable further
* @param control
* @param test
* @param listener
* @return true if the nodes are comparable further, false otherwise
* @throws DifferenceFoundException
*/
protected boolean compareNodeBasics(Node control, Node test,
DifferenceListener listener) throws DifferenceFoundException {
controlTracker.visited(control);
testTracker.visited(test);
Short controlType = new Short(control.getNodeType());
Short testType = new Short(test.getNodeType());
boolean textAndCDATA = comparingTextAndCDATA(control.getNodeType(),
test.getNodeType());
if (!textAndCDATA) {
compare(controlType, testType, control, test, listener,
NODE_TYPE);
}
compare(control.getNamespaceURI(), test.getNamespaceURI(),
control, test, listener, NAMESPACE_URI);
compare(control.getPrefix(), test.getPrefix(),
control, test, listener, NAMESPACE_PREFIX);
return textAndCDATA || controlType.equals(testType);
}
private boolean comparingTextAndCDATA(short controlType, short testType) {
return XMLUnit.getIgnoreDiffBetweenTextAndCDATA() &&
(controlType == Node.TEXT_NODE
&& testType == Node.CDATA_SECTION_NODE
||
testType == Node.TEXT_NODE
&& controlType == Node.CDATA_SECTION_NODE);
}
/**
* Compare the number of children, and if the same, compare the actual
* children via their NodeLists.
* @param control
* @param test
* @param listener
* @throws DifferenceFoundException
*/
protected void compareHasChildNodes(Node control, Node test,
DifferenceListener listener) throws DifferenceFoundException {
Boolean controlHasChildren = hasChildNodes(control);
Boolean testHasChildren = hasChildNodes(test);
compare(controlHasChildren, testHasChildren, control, test,
listener, HAS_CHILD_NODES);
}
/**
* Tests whether a Node has children, taking ignoreComments
* setting into account.
*/
private Boolean hasChildNodes(Node n) {
boolean flag = n.hasChildNodes();
if (flag && XMLUnit.getIgnoreComments()) {
List nl = nodeList2List(n.getChildNodes());
flag = !nl.isEmpty();
}
return flag ? Boolean.TRUE : Boolean.FALSE;
}
/**
* Returns the NodeList's Nodes as List, taking ignoreComments
* into account.
*/
static List<Node> nodeList2List(NodeList nl) {
int len = nl.getLength();
List<Node> l = new ArrayList<Node>(len);
for (int i = 0; i < len; i++) {
Node n = nl.item(i);
if (!XMLUnit.getIgnoreComments() || !(n instanceof Comment)) {
l.add(n);
}
}
return l;
}
/**
* Compare the number of children, and if the same, compare the actual
* children via their NodeLists.
* @param control
* @param test
* @param listener
* @param elementQualifier
* @throws DifferenceFoundException
*/
protected void compareNodeChildren(Node control, Node test,
DifferenceListener listener, ElementQualifier elementQualifier)
throws DifferenceFoundException {
List<Node> controlChildren = nodeList2List(control.getChildNodes());
List<Node> testChildren = nodeList2List(test.getChildNodes());
Integer controlLength = new Integer(controlChildren.size());
Integer testLength = new Integer(testChildren.size());
compare(controlLength, testLength, control, test, listener,
CHILD_NODELIST_LENGTH);
if (control.hasChildNodes() || test.hasChildNodes()) {
if (!control.hasChildNodes()) {
for (Node aTestChildren : testChildren) {
missingNode(null, aTestChildren, listener);
}
} else if (!test.hasChildNodes()) {
for (Node aControlChildren : controlChildren) {
missingNode(aControlChildren, null, listener);
}
} else {
compareNodeList(controlChildren, testChildren,
controlLength.intValue(), listener, 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.
* @param controlChildren
* @param testChildren
* @param numNodes convenience parameter because the calling method should
* know the value already
* @param listener
* @param 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 DifferenceFoundException
*/
protected void compareNodeList(final List<Node> controlChildren,
final List<Node> testChildren,
final int numNodes,
final DifferenceListener listener,
final ElementQualifier elementQualifier)
throws DifferenceFoundException {
int j;
final int lastTestNode = testChildren.size() - 1;
testTracker.preloadChildList(testChildren);
HashMap<Node, Node> matchingNodes = new HashMap<Node, Node>();
HashMap<Node, Integer> matchingNodeIndexes = new HashMap<Node, Integer>();
List<Node> unmatchedTestNodes = new ArrayList<Node>(testChildren);
// first pass to find the matching nodes in control and test docs
for (int i=0; i < numNodes; ++i) {
Node nextControl = controlChildren.get(i);
boolean matchOnElement = nextControl instanceof Element;
short findNodeType = nextControl.getNodeType();
int startAt = i > lastTestNode ? lastTestNode : i;
j = startAt;
boolean matchFound = false;
/*
* XMLUnit 1.2 and earlier don't check whether the
* "matched" test node has already been matched to a
* different control node and will happily match the same
* test node to each and every control node, if necessary.
*
* I (Stefan) feel this is wrong but can't change it
* without breaking backwards compatibility
* (testXpathLocation12 in test_DifferenceEngine which
* predates XMLUnit 1.0 fails, so at one point it has been
* the expected and intended behaviour).
*
* As a side effect it may leave test nodes inside the
* unmatched list, see
* https://sourceforge.net/tracker/?func=detail&aid=2807167&group_id=23187&atid=377768
*
* To overcome the later problem the code will now prefer
* test nodes that haven't already been matched to any
* other node and falls back to the first
* (multiply-)matched node if none could be found. Yes,
* this is strange.
*/
int fallbackMatch = -1;
while (!matchFound) {
Node t = testChildren.get(j);
if (findNodeType == t.getNodeType()
|| comparingTextAndCDATA(findNodeType, t.getNodeType())) {
matchFound = !matchOnElement
|| elementQualifier == null
|| elementQualifier
.qualifyForComparison((Element) nextControl,
(Element) t);
}
if (matchFound && !unmatchedTestNodes.contains(t)) {
/*
* test node already matched to a different
* control node, try the other test nodes first
* but keep this as "fallback" (unless there
* already is a fallback)
*/
if (fallbackMatch < 0) {
fallbackMatch = j;
}
matchFound = false;
}
if (!matchFound) {
++j;
if (j > lastTestNode) {
j = 0;
}
if (j == startAt) {
// been through all children
break;
}
}
}
if (!matchFound && XMLUnit.getCompareUnmatched()
&& fallbackMatch >= 0) {
matchFound = true;
j = fallbackMatch;
}
if (matchFound) {
matchingNodes.put(nextControl, testChildren.get(j));
matchingNodeIndexes.put(nextControl, new Integer(j));
unmatchedTestNodes.remove(testChildren.get(j));
}
}
// next, do the actual comparision on those that matched - or
// match them against the first test nodes that didn't match
// any other control nodes
for (int i=0; i < numNodes; ++i) {
Node nextControl = controlChildren.get(i);
Node nextTest = matchingNodes.get(nextControl);
Integer testIndex = matchingNodeIndexes.get(nextControl);
if (nextTest == null && XMLUnit.getCompareUnmatched()
&& !unmatchedTestNodes.isEmpty()) {
nextTest = unmatchedTestNodes.get(0);
testIndex = new Integer(testChildren.indexOf(nextTest));
unmatchedTestNodes.remove(0);
}
if (nextTest != null) {
compareNode(nextControl, nextTest, listener, elementQualifier);
compare(new Integer(i), testIndex,
nextControl, nextTest, listener,
CHILD_NODELIST_SEQUENCE);
} else {
missingNode(nextControl, null, listener);
}
}
// now handle remaining unmatched test nodes
for (Node node : unmatchedTestNodes) {
missingNode(null, node, listener);
}
}
private void missingNode(Node control, Node test,
DifferenceListener listener)
throws DifferenceFoundException {
if (control != null) {
controlTracker.visited(control);
compare(getQName(control), null, control, null,
listener, CHILD_NODE_NOT_FOUND, controlTracker, null);
} else {
testTracker.visited(test);
compare(null, getQName(test), null, test, listener,
CHILD_NODE_NOT_FOUND, null, testTracker);
}
}
/**
* @param aNode
* @return true if the node has a namespace
*/
private static boolean isNamespaced(Node aNode) {
String namespace = aNode.getNamespaceURI();
return namespace != null && namespace.length() > 0;
}
/**
* Compare 2 elements and their attributes
* @param control
* @param test
* @param listener
* @throws DifferenceFoundException
*/
protected void compareElement(Element control, Element test,
DifferenceListener listener) throws DifferenceFoundException {
compare(getUnNamespacedNodeName(control), getUnNamespacedNodeName(test),
control, test, listener, ELEMENT_TAG_NAME);
NamedNodeMap controlAttr = control.getAttributes();
Integer controlNonXmlnsAttrLength =
getNonSpecialAttrLength(controlAttr);
NamedNodeMap testAttr = test.getAttributes();
Integer testNonXmlnsAttrLength = getNonSpecialAttrLength(testAttr);
compare(controlNonXmlnsAttrLength, testNonXmlnsAttrLength,
control, test, listener, ELEMENT_NUM_ATTRIBUTES);
compareElementAttributes(control, test, controlAttr, testAttr,
listener);
}
/**
* The number of attributes not related to namespace declarations
* and/or Schema location.
*/
private Integer getNonSpecialAttrLength(NamedNodeMap attributes) {
int length = 0, maxLength = attributes.getLength();
for (int i = 0; i < maxLength; ++i) {
Attr a = (Attr) attributes.item(i);
if (!isXMLNSAttribute(a)
&& !isRecognizedXMLSchemaInstanceAttribute(a)) {
++length;
}
}
return new Integer(length);
}
void compareElementAttributes(Element control, Element test,
NamedNodeMap controlAttr,
NamedNodeMap testAttr,
DifferenceListener listener)
throws DifferenceFoundException {
ArrayList<Attr> unmatchedTestAttrs = new ArrayList<Attr>();
for (int i=0; i < testAttr.getLength(); ++i) {
Attr nextAttr = (Attr) testAttr.item(i);
if (!isXMLNSAttribute(nextAttr)) {
unmatchedTestAttrs.add(nextAttr);
}
}
for (int i=0; i < controlAttr.getLength(); ++i) {
Attr nextAttr = (Attr) controlAttr.item(i);
// xml namespacing is handled in compareNodeBasics
if (!isXMLNSAttribute(nextAttr)) {
boolean isNamespacedAttr = isNamespaced(nextAttr);
String attrName = getUnNamespacedNodeName(nextAttr, isNamespacedAttr);
Attr compareTo;
if (isNamespacedAttr) {
compareTo = (Attr) testAttr.getNamedItemNS(
nextAttr.getNamespaceURI(), attrName);
} else {
compareTo = (Attr) testAttr.getNamedItem(attrName);
}
if (compareTo != null) {
unmatchedTestAttrs.remove(compareTo);
}
if (isRecognizedXMLSchemaInstanceAttribute(nextAttr)) {
compareRecognizedXMLSchemaInstanceAttribute(nextAttr,
compareTo,
listener);
} else if (compareTo != null) {
compareAttribute(nextAttr, compareTo, listener);
if (!XMLUnit.getIgnoreAttributeOrder()) {
Attr attributeItem = (Attr) testAttr.item(i);
String testAttrName = ATTRIBUTE_ABSENT;
if (attributeItem != null) {
testAttrName =
getUnNamespacedNodeName(attributeItem);
}
compare(attrName, testAttrName,
nextAttr, compareTo, listener, ATTR_SEQUENCE);
}
} else {
controlTracker.clearTrackedAttribute();
controlTracker.visited(nextAttr);
testTracker.clearTrackedAttribute();
compare(getQName(nextAttr, isNamespacedAttr), null,
control, test, listener,
ATTR_NAME_NOT_FOUND);
}
}
}
for (Attr nextAttr : unmatchedTestAttrs) {
if (isRecognizedXMLSchemaInstanceAttribute(nextAttr)) {
compareRecognizedXMLSchemaInstanceAttribute(null, nextAttr,
listener);
} else {
controlTracker.clearTrackedAttribute();
testTracker.clearTrackedAttribute();
testTracker.visited(nextAttr);
compare(null,
getQName(nextAttr),
control, test, listener, ATTR_NAME_NOT_FOUND);
}
}
controlTracker.clearTrackedAttribute();
testTracker.clearTrackedAttribute();
}
private String getUnNamespacedNodeName(Node aNode) {
return getUnNamespacedNodeName(aNode, isNamespaced(aNode));
}
private static String getUnNamespacedNodeName(Node aNode, boolean isNamespacedNode) {
if (isNamespacedNode) {
return aNode.getLocalName();
}
return aNode.getNodeName();
}
private String getQName(Node aNode) {
return getQName(aNode, isNamespaced(aNode));
}
private static String getQName(Node aNode, boolean isNamespacedNode) {
if (isNamespacedNode) {
return "{" + aNode.getNamespaceURI() + "}" + aNode.getLocalName();
}
return aNode.getNodeName();
}
/**
* @param attribute
* @return true if the attribute represents a namespace declaration
*/
private boolean isXMLNSAttribute(Attr attribute) {
return XMLConstants.XMLNS_PREFIX.equals(attribute.getPrefix()) ||
XMLConstants.XMLNS_PREFIX.equals(attribute.getName());
}
/**
* @param attr
* @return true if the attribute is an XML Schema Instance
* namespace attribute XMLUnit treats in a special way.
*/
private boolean isRecognizedXMLSchemaInstanceAttribute(Attr attr) {
return XMLConstants
.W3C_XML_SCHEMA_INSTANCE_NS_URI.equals(attr.getNamespaceURI())
&& (XMLConstants
.W3C_XML_SCHEMA_INSTANCE_SCHEMA_LOCATION_ATTR
.equals(attr.getLocalName())
|| XMLConstants
.W3C_XML_SCHEMA_INSTANCE_NO_NAMESPACE_SCHEMA_LOCATION_ATTR
.equals(attr.getLocalName()));
}
/**
* Compare two attributes
* @param control
* @param test
* @param listener
* @throws DifferenceFoundException
*/
protected void compareRecognizedXMLSchemaInstanceAttribute(Attr control,
Attr test,
DifferenceListener listener)
throws DifferenceFoundException {
Attr nonNullNode = control != null ? control : test;
Difference d =
XMLConstants.W3C_XML_SCHEMA_INSTANCE_SCHEMA_LOCATION_ATTR
.equals(nonNullNode.getLocalName())
? SCHEMA_LOCATION : NO_NAMESPACE_SCHEMA_LOCATION;
if (control != null) {
controlTracker.visited(control);
}
if (test != null) {
testTracker.visited(test);
}
compare(control != null ? control.getValue() : ATTRIBUTE_ABSENT,
test != null ? test.getValue() : ATTRIBUTE_ABSENT,
control, test, listener, d);
}
/**
* Compare two attributes
* @param control
* @param test
* @param listener
* @throws DifferenceFoundException
*/
protected void compareAttribute(Attr control, Attr test,
DifferenceListener listener) throws DifferenceFoundException {
controlTracker.visited(control);
testTracker.visited(test);
compare(control.getPrefix(), test.getPrefix(), control, test,
listener, NAMESPACE_PREFIX);
compare(control.getValue(), test.getValue(), control, test,
listener, ATTR_VALUE);
compare(control.getSpecified() ? Boolean.TRUE : Boolean.FALSE,
test.getSpecified() ? Boolean.TRUE : Boolean.FALSE,
control, test, listener, ATTR_VALUE_EXPLICITLY_SPECIFIED);
}
/**
* Compare two CDATA sections - unused, kept for backwards compatibility
* @param control
* @param test
* @param listener
* @throws DifferenceFoundException
*/
protected void compareCDataSection(CDATASection control, CDATASection test,
DifferenceListener listener) throws DifferenceFoundException {
compareText(control, test, listener);
}
/**
* Compare two comments
* @param control
* @param test
* @param listener
* @throws DifferenceFoundException
*/
protected void compareComment(Comment control, Comment test,
DifferenceListener listener) throws DifferenceFoundException {
if (!XMLUnit.getIgnoreComments()) {
compareCharacterData(control, test, listener, COMMENT_VALUE);
}
}
/**
* Compare two DocumentType nodes
* @param control
* @param test
* @param listener
* @throws DifferenceFoundException
*/
protected void compareDocumentType(DocumentType control, DocumentType test,
DifferenceListener listener) throws DifferenceFoundException {
compare(control.getName(), test.getName(), control, test, listener,
DOCTYPE_NAME);
compare(control.getPublicId(), test.getPublicId(), control, test, listener,
DOCTYPE_PUBLIC_ID);
compare(control.getSystemId(), test.getSystemId(),
control, test, listener, DOCTYPE_SYSTEM_ID);
}
/**
* Compare two processing instructions
* @param control
* @param test
* @param listener
* @throws DifferenceFoundException
*/
protected void compareProcessingInstruction(ProcessingInstruction control,
ProcessingInstruction test, DifferenceListener listener)
throws DifferenceFoundException {
compare(control.getTarget(), test.getTarget(), control, test, listener,
PROCESSING_INSTRUCTION_TARGET);
compare(control.getData(), test.getData(), control, test, listener,
PROCESSING_INSTRUCTION_DATA);
}
/**
* Compare text - unused, kept for backwards compatibility
* @param control
* @param test
* @param listener
* @throws DifferenceFoundException
*/
protected void compareText(Text control, Text test,
DifferenceListener listener)
throws DifferenceFoundException {
compareText((CharacterData) control, (CharacterData) test, listener);
}
/**
* Compare text
* @param control
* @param test
* @param listener
* @throws DifferenceFoundException
*/
protected void compareText(CharacterData control, CharacterData test,
DifferenceListener listener)
throws DifferenceFoundException {
compareCharacterData(control, test, listener,
control instanceof CDATASection ? CDATA_VALUE : TEXT_VALUE);
}
/**
* Character comparison method used by comments, text and CDATA sections
* @param control
* @param test
* @param listener
* @param difference
* @throws DifferenceFoundException
*/
private void compareCharacterData(CharacterData control, CharacterData test,
DifferenceListener listener, Difference difference)
throws DifferenceFoundException {
compare(control.getData(), test.getData(), control, test, listener,
difference);
}
/**
* If the expected and actual values are unequal then inform the listener of
* a difference and throw a DifferenceFoundException.
* @param expected
* @param actual
* @param control
* @param test
* @param listener
* @param difference
* @throws DifferenceFoundException
*/
protected void compare(Object expected, Object actual,
Node control, Node test, DifferenceListener listener, Difference difference)
throws DifferenceFoundException {
compare(expected, actual, control, test, listener, difference,
controlTracker, testTracker);
}
/**
* If the expected and actual values are unequal then inform the listener of
* a difference and throw a DifferenceFoundException.
* @param expected
* @param actual
* @param control
* @param test
* @param listener
* @param difference
* @param controlLoc
* @param testLoc
* @throws DifferenceFoundException
*/
protected void compare(Object expected, Object actual,
Node control, Node test, DifferenceListener listener,
Difference difference, XpathNodeTracker controlLoc,
XpathNodeTracker testLoc)
throws DifferenceFoundException {
NodeDetail controlDetail = new NodeDetail(String.valueOf(expected),
control,
controlLoc == null ? null
: controlLoc.toXpathString());
NodeDetail testDetail = new NodeDetail(String.valueOf(actual),
test,
testLoc == null ? null
: testLoc.toXpathString());
Difference differenceInstance = new Difference(difference,
controlDetail, testDetail);
if (unequal(expected, actual)) {
listener.differenceFound(differenceInstance);
if (controller.haltComparison(differenceInstance)) {
throw flowControlException;
}
} else if (matchTracker != null) {
matchTracker.matchFound(differenceInstance);
}
}
/**
* Test two possibly null values for inequality
* @param expected
* @param actual
* @return TRUE if the values are neither both null, nor equals() equal
*/
private boolean unequal(Object expected, Object actual) {
return expected==null ? actual!=null : unequalNotNull(expected, actual);
}
/**
* Test two non-null values for inequality
* @param expected
* @param actual
* @return TRUE if the values are not equals() equal (taking whitespace
* into account if necessary)
*/
private boolean unequalNotNull(Object expected, Object actual) {
if ((XMLUnit.getIgnoreWhitespace() || XMLUnit.getNormalizeWhitespace())
&& expected instanceof String && actual instanceof String) {
String expectedString = ((String) expected).trim();
String actualString = ((String) actual).trim();
if (XMLUnit.getNormalizeWhitespace()) {
expectedString = normalizeWhitespace(expectedString);
actualString = normalizeWhitespace(actualString);
}
return !expectedString.equals(actualString);
}
return !(expected.equals(actual));
}
/**
* Replace all whitespace characters with SPACE and collapse
* consecutive whitespace chars to a single SPACE.
*/
final static String normalizeWhitespace(String orig) {
StringBuilder sb = new StringBuilder();
boolean lastCharWasWhitespace = false;
boolean changed = false;
char[] characters = orig.toCharArray();
for (int i = 0; i < characters.length; i++) {
if (Character.isWhitespace(characters[i])) {
if (lastCharWasWhitespace) {
// suppress character
changed = true;
} else {
sb.append(' ');
changed |= characters[i] != ' ';
lastCharWasWhitespace = true;
}
} else {
sb.append(characters[i]);
lastCharWasWhitespace = false;
}
}
return changed ? sb.toString() : orig;
}
/**
* Marker exception thrown by the protected compare() method and passed
* upwards through the call stack to the public compare() method.
*/
protected static final class DifferenceFoundException extends Exception {
private DifferenceFoundException() {
super("This exception is used to control flow");
}
}
}