UpgradeParentVersion: option to only upgrade external parents

rewrite-maven/src/main/java/org/openrewrite/maven/ChangeParentPom.java

@@ -26,6 +26,7 @@
 import org.openrewrite.maven.tree.*;
 import org.openrewrite.semver.Semver;
 import org.openrewrite.semver.VersionComparator;
+import org.openrewrite.xml.AddOrUpdateChild;
 import org.openrewrite.xml.AddToTagVisitor;
 import org.openrewrite.xml.ChangeTagValueVisitor;
 import org.openrewrite.xml.TagNameComparator;
@@ -38,6 +39,7 @@
 
 import static java.util.Collections.emptyList;
 import static org.openrewrite.internal.StringUtils.matchesGlob;
+import static org.openrewrite.maven.tree.Parent.DEFAULT_RELATIVE_PATH;
 
 @Value
 @EqualsAndHashCode(callSuper = false)
@@ -74,7 +76,8 @@ public class ChangeParentPom extends Recipe {
     String newVersion;
 
     @Option(displayName = "Old relative path",
-            description = "The relativePath of the maven parent pom to be changed away from.",
+            description = "The relativePath of the maven parent pom to be changed away from. " +
+                          "Use an empty String to match `<relativePath />`, use `../pom.xml` to match the default value.",
             example = "../../pom.xml",
             required = false)
     @Nullable
@@ -158,7 +161,7 @@ public Xml.Tag visitTag(Xml.Tag tag, ExecutionContext ctx) {
 
                     if (matchesGlob(resolvedPom.getValue(tag.getChildValue("groupId").orElse(null)), oldGroupId) &&
                         matchesGlob(resolvedPom.getValue(tag.getChildValue("artifactId").orElse(null)), oldArtifactId) &&
-                        (oldRelativePath == null || matchesGlob(resolvedPom.getValue(tag.getChildValue("relativePath").orElse(null)), oldRelativePath))) {
+                        (oldRelativePath == null || matchesGlob(determineRelativePath(tag, resolvedPom), oldRelativePath))) {
                         String oldVersion = resolvedPom.getValue(tag.getChildValue("version").orElse(null));
                         assert oldVersion != null;
                         String currentGroupId = tag.getChildValue("groupId").orElse(oldGroupId);
@@ -211,9 +214,15 @@ public Xml.Tag visitTag(Xml.Tag tag, ExecutionContext ctx) {
                             }
 
                             // Update or add relativePath
-                            if (oldRelativePath != null && !oldRelativePath.equals(targetRelativePath)) {
-                                changeParentTagVisitors.add(new ChangeTagValueVisitor<>(t.getChild("relativePath").get(), targetRelativePath));
-                            } else if (mismatches(tag.getChild("relativePath").orElse(null), targetRelativePath)) {
+                            Optional<Xml.Tag> existingRelativePath = t.getChild("relativePath");
+                            if (oldRelativePath != null && !oldRelativePath.equals(targetRelativePath) && existingRelativePath.isPresent()) {
+                                if (StringUtils.isBlank(targetRelativePath)) {
+                                    // ChangeTagValueVisitor would keep the closing tag
+                                    changeParentTagVisitors.add(new AddOrUpdateChild<>(t, Xml.Tag.build("<relativePath />")));
+                                } else {
+                                    changeParentTagVisitors.add(new ChangeTagValueVisitor<>(existingRelativePath.get(), targetRelativePath));
+                                }
+                            } else if (mismatches(existingRelativePath.orElse(null), targetRelativePath)) {
                                 final Xml.Tag relativePathTag;
                                 if (StringUtils.isBlank(targetRelativePath)) {
                                     relativePathTag = Xml.Tag.build("<relativePath />");
@@ -281,6 +290,14 @@ private Optional<String> findAcceptableVersion(String groupId, String artifactId
         });
     }
 
+    private static @Nullable String determineRelativePath(Xml.Tag tag, ResolvedPom resolvedPom) {
+        Optional<Xml.Tag> relativePath = tag.getChild("relativePath");
+        if (relativePath.isPresent()) {
+            return resolvedPom.getValue(relativePath.get().getValue().orElse(""));
+        }
+        return DEFAULT_RELATIVE_PATH;
+    }
+
     private static final Pattern PROPERTY_PATTERN = Pattern.compile("\\$\\{([^}]+)}");
 
     private static Map<String, String> getPropertiesInUse(Xml.Document pomXml, ExecutionContext ctx) {

rewrite-maven/src/main/java/org/openrewrite/maven/UpgradeParentVersion.java

@@ -50,6 +50,12 @@ public class UpgradeParentVersion extends Recipe {
     @Nullable
     String versionPattern;
 
+    @Option(displayName = "Only external",
+            description = "Only upgrade `<parent>` if external to the project, i.e. it has an empty `<relativePath>`. Defaults to `false`.",
+            required = false)
+    @Nullable
+    Boolean onlyExternal;
+
     @Override
     public String getDisplayName() {
         return "Upgrade Maven parent project version";
@@ -82,7 +88,7 @@ public TreeVisitor<?, ExecutionContext> getVisitor() {
     }
 
     private ChangeParentPom changeParentPom() {
-        return new ChangeParentPom(groupId, null, artifactId, null, newVersion, null, null,
+        return new ChangeParentPom(groupId, null, artifactId, null, newVersion, Boolean.TRUE.equals(onlyExternal) ? "" : null, null,
                 versionPattern, false);
     }
 }

rewrite-maven/src/main/java/org/openrewrite/maven/tree/Parent.java

@@ -22,6 +22,8 @@
 @Value
 @With
 public class Parent {
+    public static final String DEFAULT_RELATIVE_PATH = "../pom.xml";
+
     GroupArtifactVersion gav;
 
     @Nullable

rewrite-maven/src/test/java/org/openrewrite/maven/AddRepositoryTest.java

@@ -312,7 +312,7 @@ void updateToSpringBoot30Snapshot() {
             new AddRepository("boot-snapshots", "https://repo.spring.io/snapshot", null, null,
               true, null, null,
               null, null, null, null),
-            new UpgradeParentVersion("org.springframework.boot", "spring-boot-starter-parent", "3.0.0-SNAPSHOT", null)
+            new UpgradeParentVersion("org.springframework.boot", "spring-boot-starter-parent", "3.0.0-SNAPSHOT", null, null)
           ),
           pomXml(
             """