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75 changes: 75 additions & 0 deletions
75
cli/src/main/java/com/devonfw/tools/ide/merge/xmlmerger/matcher/ElementMatcher.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| package com.devonfw.tools.ide.merge.xmlmerger.matcher; | ||
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| import com.devonfw.tools.ide.merge.xmlmerger.model.MergeElement; | ||
| import org.w3c.dom.Document; | ||
| import org.w3c.dom.Element; | ||
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| import javax.xml.namespace.QName; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
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| /** | ||
| * The ElementMatcher class is responsible for matching XML elements in a target document based on the provided update elements. | ||
| */ | ||
| public class ElementMatcher { | ||
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| private final Map<QName, IdComputer> qNameIdMap; | ||
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| public ElementMatcher() { | ||
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| qNameIdMap = new HashMap<>(); | ||
| } | ||
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| /** | ||
| * Updates the ID strategy for a given QName (qualified name) of an XML element. | ||
| * | ||
| * @param qname the QName of the XML element | ||
| * @param id the ID value to be used for matching the element | ||
| */ | ||
| public void updateId(QName qname, String id) { | ||
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| qNameIdMap.put(qname, new IdComputer(id)); | ||
| } | ||
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| /** | ||
| * Matches an update element in the target document. | ||
| * | ||
| * @param updateElement the update element to be matched | ||
| * @param targetDocument the target document in which to match the element | ||
| * @return the matched MergeElement if found, or {@code null} if not found | ||
| */ | ||
| public MergeElement matchElement(MergeElement updateElement, Document targetDocument) { | ||
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| if (updateElement.isRootElement()) { | ||
| Element sourceRoot = updateElement.getElement(); | ||
| Element targetRoot = targetDocument.getDocumentElement(); | ||
| if (sourceRoot.getNamespaceURI() != null || targetRoot.getNamespaceURI() != null) { | ||
| if (!sourceRoot.getNamespaceURI().equals(targetRoot.getNamespaceURI())) { | ||
| throw new IllegalStateException("URI of elements don't match. Found " + sourceRoot.getNamespaceURI() + "and " + targetRoot.getNamespaceURI()); | ||
| } | ||
| } | ||
| return new MergeElement(targetRoot); | ||
| } | ||
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| String id = updateElement.getId(); | ||
| if (id.isEmpty()) { | ||
| IdComputer idComputer = qNameIdMap.get(updateElement.getQName()); | ||
| if (idComputer == null) { | ||
| throw new IllegalStateException("no Id value was defined for " + updateElement.getXPath()); | ||
| } | ||
| Element matchedNode = idComputer.evaluateExpression(updateElement, targetDocument); | ||
| if (matchedNode != null) { | ||
| return new MergeElement(matchedNode); | ||
| } | ||
| } else { | ||
| updateId(updateElement.getQName(), id); | ||
| IdComputer idComputer = qNameIdMap.get(updateElement.getQName()); | ||
| Element matchedNode = idComputer.evaluateExpression(updateElement, targetDocument); | ||
| if (matchedNode != null) { | ||
| return new MergeElement(matchedNode); | ||
| } | ||
| } | ||
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| return null; | ||
| } | ||
| } |
74 changes: 74 additions & 0 deletions
74
cli/src/main/java/com/devonfw/tools/ide/merge/xmlmerger/matcher/IdComputer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| package com.devonfw.tools.ide.merge.xmlmerger.matcher; | ||
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| import com.devonfw.tools.ide.merge.xmlmerger.model.MergeElement; | ||
| import org.w3c.dom.Document; | ||
| import org.w3c.dom.Element; | ||
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| import javax.xml.xpath.XPath; | ||
| import javax.xml.xpath.XPathConstants; | ||
| import javax.xml.xpath.XPathExpression; | ||
| import javax.xml.xpath.XPathExpressionException; | ||
| import javax.xml.xpath.XPathFactory; | ||
|
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| /** | ||
| * The IdComputer class is responsible for building XPath expressions and evaluating those expressions to match elements in a target document. | ||
| */ | ||
| public class IdComputer { | ||
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| private final String id; | ||
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| private static XPathFactory xPathFactory = XPathFactory.newInstance(); | ||
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| public IdComputer(String id) { | ||
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| this.id = id; | ||
| } | ||
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| /** | ||
| * Evaluates the XPath expression for the given merge element in the target document. | ||
| * | ||
| * @param mergeElement the merge element for which to build the XPath expression | ||
| * @param targetDocument the target document in which to evaluate the XPath expression | ||
| * @return the matched Element if found, or null if not found | ||
| */ | ||
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| public Element evaluateExpression(MergeElement mergeElement, Document targetDocument) { | ||
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| try { | ||
| XPath xpath = xPathFactory.newXPath(); | ||
| String xpathExpr = buildXPathExpression(mergeElement); | ||
| XPathExpression xpathExpression = xpath.compile(xpathExpr); | ||
| return (Element) xpathExpression.evaluate(targetDocument, XPathConstants.NODE); | ||
| } catch (XPathExpressionException e) { | ||
| throw new IllegalStateException("Failed to match " + mergeElement.getXPath(), e); | ||
| } | ||
| } | ||
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| /** | ||
| * Builds the XPath expression for the given merge element based on the ID value. | ||
| * | ||
| * @param mergeElement the merge element for which to build the XPath expression | ||
| * @return the XPath expression as a String | ||
| */ | ||
| private String buildXPathExpression(MergeElement mergeElement) { | ||
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| String xPath = mergeElement.getXPath(); | ||
| if (id.startsWith(".")) { | ||
| return xPath + "/" + id; | ||
| } else if (id.startsWith("/")) { | ||
| return id; | ||
| } else if (id.startsWith("@")) { | ||
| String attributeName = id.substring(1); | ||
| String attributeValue = mergeElement.getElement().getAttribute(attributeName); | ||
| return xPath + String.format("[@%s='%s']", attributeName, attributeValue); | ||
| } else if (id.equals("name()")) { | ||
| String tagName = mergeElement.getElement().getTagName(); | ||
| return xPath + String.format("[name()='%s']", tagName); | ||
| } else if (id.equals("text()")) { | ||
| String textContent = mergeElement.getElement().getTextContent(); | ||
| return xPath + String.format("[text()='%s']", textContent); | ||
| } | ||
| return null; | ||
| } | ||
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| } |
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