Implement support for Maven's prerequisites mechanism

rewrite-maven/src/main/java/org/openrewrite/maven/internal/RawPom.java

@@ -90,6 +90,9 @@ public class RawPom {
     @Nullable
     String description;
 
+    @Nullable
+    Prerequisites prerequisites;
+
     @Nullable
     String packaging;
 
@@ -192,6 +195,14 @@ public Licenses(@JacksonXmlProperty(localName = "license") List<License> license
         }
     }
 
+    @Getter
+    public static class Prerequisites {
+
+        @JacksonXmlProperty(localName = "maven")
+        @Nullable
+        public String maven;
+    }
+
     @Getter
     public static class Profiles {
         private final List<Profile> profiles;
@@ -371,6 +382,7 @@ public Pom toPom(@Nullable Path inputPath, @Nullable MavenRepository repo) {
                         null))
                 .name(name)
                 .obsoletePomVersion(pomVersion)
+                .prerequisites(prerequisites == null ? null : new org.openrewrite.maven.tree.Prerequisites(prerequisites.getMaven()))
                 .packaging(packaging)
                 .properties(getProperties() == null ? emptyMap() : getProperties())
                 .licenses(mapLicenses(getLicenses()))

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

@@ -85,6 +85,9 @@ public static int getModelVersion() {
     @Nullable
     String name;
 
+    @Nullable
+    Prerequisites prerequisites;
+
     @Nullable
     String packaging;
 

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

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2024 the original author or authors.
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * https://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.openrewrite.maven.tree;
+
+import lombok.Value;
+import org.jspecify.annotations.Nullable;
+
+/**
+ * Models the <a href="https://maven.apache.org/pom.html#Prerequisites">prerequisites</a> element of a POM.
+ */
+@Value
+public class Prerequisites {
+
+    /**
+     * The minimum version of Maven required to build the project.
+     */
+    @Nullable
+    String maven;
+}

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

@@ -301,6 +301,10 @@ public String getPackaging() {
             case "project.parent.version":
             case "parent.version":
                 return requested.getParent() != null ? requested.getParent().getVersion() : null;
+            case "prerequisites.maven":
+            case "pom.prerequisites.maven":
+            case "project.prerequisites.maven":
+                return requested.getPrerequisites() == null ? null : requested.getPrerequisites().getMaven();
         }
 
         return System.getProperty(property);