Add org.mongodb:bson dependency

error-prone-contrib/pom.xml

@@ -174,10 +174,15 @@
             <artifactId>mockito-core</artifactId>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>org.mongodb</groupId>
+            <artifactId>bson</artifactId>
+            <scope>provided</scope>
+        </dependency>
         <dependency>
             <groupId>org.mongodb</groupId>
             <artifactId>mongodb-driver-core</artifactId>
-            <scope>test</scope>
+            <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>org.openrewrite</groupId>

error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/MongoDBRules.java

@@ -0,0 +1,31 @@
+package tech.picnic.errorprone.refasterrules;
+
+import static com.google.errorprone.refaster.ImportPolicy.STATIC_IMPORT_ALWAYS;
+import static com.mongodb.client.model.Filters.eq;
+
+import com.google.errorprone.refaster.annotation.AfterTemplate;
+import com.google.errorprone.refaster.annotation.BeforeTemplate;
+import com.google.errorprone.refaster.annotation.UseImportPolicy;
+import com.mongodb.client.model.Filters;
+import org.bson.conversions.Bson;
+import tech.picnic.errorprone.refaster.annotation.OnlineDocumentation;
+
+/** Refaster rules related to MongoDB client expressions and statements. */
+@OnlineDocumentation
+final class MongoDBRules {
+  private MongoDBRules() {}
+
+  /** Avoid {@link Enum#toString()} invocations when invoking {@link Filters#eq(String, Object)}. */
+  static final class Eq {
+    @BeforeTemplate
+    Bson before(String field, Enum<?> value) {
+      return eq(field, value.toString());
+    }
+
+    @AfterTemplate
+    @UseImportPolicy(STATIC_IMPORT_ALWAYS)
+    Bson after(String field, Enum<?> value) {
+      return eq(field, value);
+    }
+  }
+}

error-prone-contrib/src/test/java/tech/picnic/errorprone/refasterrules/RefasterRulesTest.java

@@ -59,6 +59,7 @@ final class RefasterRulesTest {
           MapEntryRules.class,
           MapRules.class,
           MockitoRules.class,
+          MongoDBRules.class,
           MultimapRules.class,
           NullRules.class,
           OptionalRules.class,

error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/MongoDBRulesTestInput.java

@@ -0,0 +1,13 @@
+package tech.picnic.errorprone.refasterrules;
+
+import static com.mongodb.client.model.Filters.eq;
+
+import org.bson.conversions.Bson;
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+import tech.picnic.errorprone.utils.ThirdPartyLibrary;
+
+final class MongoDBRulesTest implements RefasterRuleCollectionTestCase {
+  Bson testEq() {
+    return eq("foo", ThirdPartyLibrary.GUAVA.toString());
+  }
+}

error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/MongoDBRulesTestOutput.java

@@ -0,0 +1,13 @@
+package tech.picnic.errorprone.refasterrules;
+
+import static com.mongodb.client.model.Filters.eq;
+
+import org.bson.conversions.Bson;
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+import tech.picnic.errorprone.utils.ThirdPartyLibrary;
+
+final class MongoDBRulesTest implements RefasterRuleCollectionTestCase {
+  Bson testEq() {
+    return eq("foo", ThirdPartyLibrary.GUAVA);
+  }
+}

pom.xml

@@ -214,6 +214,7 @@
         <version.jdk>17</version.jdk>
         <version.maven>3.9.5</version.maven>
         <version.mockito>5.12.0</version.mockito>
+        <version.mongodb>5.1.0</version.mongodb>
         <version.nopen-checker>1.0.1</version.nopen-checker>
         <version.nullaway>0.11.0</version.nullaway>
         <version.pitest-git>1.1.4</version.pitest-git>
@@ -463,10 +464,15 @@
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
+            <dependency>
+                <groupId>org.mongodb</groupId>
+                <artifactId>bson</artifactId>
+                <version>${version.mongodb}</version>
+            </dependency>
             <dependency>
                 <groupId>org.mongodb</groupId>
                 <artifactId>mongodb-driver-core</artifactId>
-                <version>5.1.0</version>
+                <version>${version.mongodb}</version>
             </dependency>
             <dependency>
                 <groupId>org.openrewrite</groupId>