First class line indent checkstyle rule

checkstyle.xml

@@ -16,6 +16,12 @@
         <property name="maximum" value="0"/>
         <property name="message" value="Line has trailing spaces."/>
     </module>
+    <module name="RegexpMultiline">
+        <property name="format" value="^([^\n ]+ )*(class|interface|enum) [^{]*\{\n[^\n}]"/>
+        <property name="message" value="Leave empty row after class/interface/enum definition!"/>
+        <property name="severity" value="error"/>
+        <property name="fileExtensions" value="groovy,java"/>
+    </module>
     <module name="RegexpMultiline">
         <property name="format" value="System\.(out|err)\.print"/>
     </module>

src/main/java/com/iab/openrtb/request/DataObject.java

@@ -7,6 +7,7 @@
 @Builder(toBuilder = true)
 @Value
 public class DataObject {
+
     Integer type;
 
     Integer len;

src/main/java/com/iab/openrtb/request/EventTracker.java

@@ -9,6 +9,7 @@
 @Builder
 @Value
 public class EventTracker {
+
     Integer event;
 
     List<Integer> methods;

src/main/java/com/iab/openrtb/request/ImageObject.java

@@ -9,6 +9,7 @@
 @Builder(toBuilder = true)
 @Value
 public class ImageObject {
+
     Integer type;
 
     Integer w;

src/main/java/com/iab/openrtb/request/TitleObject.java

@@ -7,6 +7,7 @@
 @Builder(toBuilder = true)
 @Value
 public class TitleObject {
+
     Integer len;
 
     ObjectNode ext;

src/main/java/com/iab/openrtb/request/VideoObject.java

@@ -9,6 +9,7 @@
 @Builder(toBuilder = true)
 @Value
 public class VideoObject {
+
     List<String> mimes;
 
     Integer minduration;

src/main/java/com/iab/openrtb/request/ntv/Protocol.java

@@ -4,6 +4,7 @@
  * Options for the various bid response protocols that could be supported by an exchange.
  */
 public enum Protocol {
+
     /**
      * VAST 1.0
      */

src/main/java/org/prebid/server/bidder/advangelists/AdvangelistsBidder.java

@@ -39,6 +39,7 @@
 import java.util.stream.Collectors;
 
 public class AdvangelistsBidder implements Bidder<BidRequest> {
+
     private static final TypeReference<ExtPrebid<?, ExtImpAdvangelists>> ADVANGELISTS_EXT_TYPE_REFERENCE = new
             TypeReference<ExtPrebid<?, ExtImpAdvangelists>>() {
             };

src/main/java/org/prebid/server/bidder/brightroll/model/PublisherOverride.java

@@ -9,6 +9,7 @@
 @Value
 @AllArgsConstructor(staticName = "of")
 public class PublisherOverride {
+
     /**
      * Blocked advertisers.
      */

src/main/java/org/prebid/server/bidder/grid/model/ExtImpGrid.java

@@ -6,5 +6,6 @@
 @AllArgsConstructor(staticName = "of")
 @Value
 public class ExtImpGrid {
+
     Integer uid;
 }

src/main/java/org/prebid/server/bidder/improvedigital/ImprovedigitalBidder.java

@@ -8,6 +8,7 @@
  * ImproveDigital {@link Bidder} implementation.
  */
 public class ImprovedigitalBidder extends OpenrtbBidder<Void> {
+
     public ImprovedigitalBidder(String endpointUrl, JacksonMapper mapper) {
         super(endpointUrl, RequestCreationStrategy.SINGLE_REQUEST, Void.class, mapper);
     }

src/main/java/org/prebid/server/bidder/lunamedia/LunamediaBidder.java

@@ -40,6 +40,7 @@
 import java.util.stream.Collectors;
 
 public class LunamediaBidder implements Bidder<BidRequest> {
+
     private static final TypeReference<ExtPrebid<?, ExtImpLunamedia>> IMP_EXT_TYPE_REFERENCE = new
             TypeReference<ExtPrebid<?, ExtImpLunamedia>>() {
             };

src/main/java/org/prebid/server/bidder/ninthdecimal/NinthdecimalBidder.java

@@ -40,6 +40,7 @@
 import java.util.stream.Collectors;
 
 public class NinthdecimalBidder implements Bidder<BidRequest> {
+
     private static final TypeReference<ExtPrebid<?, ExtImpNinthdecimal>> NINTHDECIMAL_EXT_TYPE_REFERENCE = new
             TypeReference<ExtPrebid<?, ExtImpNinthdecimal>>() {
             };

src/main/java/org/prebid/server/bidder/openx/model/OpenxImpType.java

@@ -1,6 +1,7 @@
 package org.prebid.server.bidder.openx.model;
 
 public enum OpenxImpType {
+
     // supported
     banner, video,
     //not supported

src/main/java/org/prebid/server/bidder/pubmatic/proto/PubmaticBidExt.java

@@ -7,6 +7,7 @@
 @Value
 @AllArgsConstructor(staticName = "of")
 public class PubmaticBidExt {
+
     @JsonProperty("BidType")
     Integer bidType;
 

src/main/java/org/prebid/server/bidder/rtbhouse/RtbhouseBidder.java

@@ -4,6 +4,7 @@
 import org.prebid.server.json.JacksonMapper;
 
 public class RtbhouseBidder extends OpenrtbBidder<Void> {
+
     public RtbhouseBidder(String endpointUrl, JacksonMapper mapper) {
         super(endpointUrl, RequestCreationStrategy.SINGLE_REQUEST, Void.class, mapper);
     }

src/main/java/org/prebid/server/bidder/telaria/TelariaBidder.java

@@ -47,6 +47,7 @@
 import java.util.zip.GZIPInputStream;
 
 public class TelariaBidder implements Bidder<BidRequest> {
+
     private static final String DEFAULT_BID_CURRENCY = "USD";
     private static final TypeReference<ExtPrebid<?, ExtImpTelaria>> TELARIA_EXT_TYPE_REFERENCE =
             new TypeReference<ExtPrebid<?, ExtImpTelaria>>() {

src/main/java/org/prebid/server/bidder/ucfunnel/UcfunnelBidder.java

@@ -35,6 +35,7 @@
  * Ucfunnel {@link Bidder} implementation.
  */
 public class UcfunnelBidder implements Bidder<BidRequest> {
+
     private static final TypeReference<ExtPrebid<?, ExtImpUcfunnel>> UCFUNNEL_EXT_TYPE_REFERENCE =
             new TypeReference<ExtPrebid<?, ExtImpUcfunnel>>() {
             };

src/main/java/org/prebid/server/bidder/vrtcal/VrtcalBidder.java

@@ -9,6 +9,7 @@
 import java.util.List;
 
 public class VrtcalBidder extends OpenrtbBidder<ExtImpVrtcal> {
+
     public VrtcalBidder(String endpointUrl, JacksonMapper mapper) {
         super(endpointUrl, RequestCreationStrategy.SINGLE_REQUEST, ExtImpVrtcal.class, mapper);
     }

src/main/java/org/prebid/server/bidder/yieldone/YieldoneBidder.java

@@ -37,6 +37,7 @@
  * Yieldone {@link Bidder} implementation.
  */
 public class YieldoneBidder implements Bidder<BidRequest> {
+
     private static final TypeReference<ExtPrebid<?, ExtImpYieldone>> YIELDONE_EXT_TYPE_REFERENCE =
             new TypeReference<ExtPrebid<?, ExtImpYieldone>>() {
             };

src/main/java/org/prebid/server/health/model/Status.java

@@ -1,6 +1,7 @@
 package org.prebid.server.health.model;
 
 public enum Status {
+
     UP,
     DOWN
 }

src/main/java/org/prebid/server/identity/IdGeneratorType.java

@@ -4,5 +4,6 @@
  * Describes all available {@link IdGenerator} types.
  */
 public enum IdGeneratorType {
+
     none, uuid
 }

src/main/java/org/prebid/server/metric/CounterType.java

@@ -1,5 +1,6 @@
 package org.prebid.server.metric;
 
 public enum CounterType {
+
     counter, flushingCounter, meter
 }

src/main/java/org/prebid/server/metric/MetricName.java

@@ -1,6 +1,7 @@
 package org.prebid.server.metric;
 
 public enum MetricName {
+
     // connection
     connection_accept_errors,
 

src/main/java/org/prebid/server/metric/model/AccountMetricsVerbosityLevel.java

@@ -1,6 +1,7 @@
 package org.prebid.server.metric.model;
 
 public enum AccountMetricsVerbosityLevel {
+
     none, basic, detailed;
 
     public boolean isAtLeast(AccountMetricsVerbosityLevel another) {

src/main/java/org/prebid/server/proto/openrtb/ext/request/consumable/ExtImpConsumable.java

@@ -10,6 +10,7 @@
 @AllArgsConstructor(staticName = "of")
 @Value
 public class ExtImpConsumable {
+
     @JsonProperty("networkId")
     Integer networkId;
 

src/main/java/org/prebid/server/proto/openrtb/ext/request/emxdigital/ExtImpEmxDigital.java

@@ -9,6 +9,7 @@
 @AllArgsConstructor(staticName = "of")
 @Value
 public class ExtImpEmxDigital {
+
     String tagid;
 
     String bidfloor;

src/main/java/org/prebid/server/proto/openrtb/ext/request/mgid/ExtImpMgid.java

@@ -14,6 +14,7 @@
 )
 @Value
 public class ExtImpMgid {
+
     @JsonProperty("accountId")
     String accountId;
 

src/main/java/org/prebid/server/proto/openrtb/ext/request/openx/ExtImpOpenx.java

@@ -14,6 +14,7 @@
 @Builder
 @Value
 public class ExtImpOpenx {
+
     String unit;
 
     @JsonProperty("delDomain")

src/main/java/org/prebid/server/proto/openrtb/ext/request/visx/ExtImpVisx.java

@@ -13,6 +13,7 @@
 )
 @Value
 public class ExtImpVisx {
+
     Integer uid;
 
     List<Integer> size;

src/main/java/org/prebid/server/proto/openrtb/ext/request/zeroclickfraud/ExtImpZeroclickfraud.java

@@ -10,6 +10,7 @@
 @AllArgsConstructor(staticName = "of")
 @Value
 public class ExtImpZeroclickfraud {
+
     @JsonProperty("sourceId")
     Integer sourceId;
 

src/main/java/org/prebid/server/proto/openrtb/ext/response/BidType.java

@@ -3,6 +3,7 @@
 import com.fasterxml.jackson.annotation.JsonProperty;
 
 public enum BidType {
+
     banner,
     video,
     audio,

src/main/java/org/prebid/server/proto/response/MediaType.java

@@ -1,5 +1,6 @@
 package org.prebid.server.proto.response;
 
 public enum MediaType {
+
     banner, video
 }

src/main/java/org/prebid/server/settings/model/EnforcePurpose.java

@@ -3,6 +3,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 
 public enum EnforcePurpose {
+
     no, basic, full;
 
     @JsonCreator

src/main/java/org/prebid/server/settings/model/StoredDataType.java

@@ -4,5 +4,6 @@
  * Defines the type of stored data, used in creating {@link StoredDataResult}.
  */
 public enum StoredDataType {
+
     request, imp, seatbid
 }

src/main/java/org/prebid/server/settings/model/TriFunction.java

@@ -10,5 +10,6 @@
  */
 @FunctionalInterface
 public interface TriFunction<T, U, V, R> {
+
     R apply(T t, U u, V v);
 }

src/main/java/org/prebid/server/spring/config/bidder/KidozConfiguration.java

@@ -21,6 +21,7 @@
 @Configuration
 @PropertySource(value = "classpath:/bidder-config/kidoz.yaml", factory = YamlPropertySourceFactory.class)
 public class KidozConfiguration {
+
     private static final String BIDDER_NAME = "kidoz";
 
     @Autowired

src/main/java/org/prebid/server/spring/config/bidder/ValueImpressionConfiguration.java

@@ -21,6 +21,7 @@
 @Configuration
 @PropertySource(value = "classpath:/bidder-config/valueimpression.yaml", factory = YamlPropertySourceFactory.class)
 public class ValueImpressionConfiguration {
+
     private static final String BIDDER_NAME = "valueimpression";
 
     @Autowired

src/test/java/org/prebid/server/bidder/aja/AjaBidderTest.java

@@ -32,6 +32,7 @@
 import static org.prebid.server.proto.openrtb.ext.response.BidType.banner;
 
 public class AjaBidderTest extends VertxTest {
+
     private static final String ENDPOINT_URL = "https://test.endpoint.com";
 
     private AjaBidder ajaBidder;

src/test/java/org/prebid/server/bidder/ucfunnel/UcfunnelBidderTest.java

@@ -31,6 +31,7 @@
 import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
 
 public class UcfunnelBidderTest extends VertxTest {
+
     private static final String ENDPOINT_URL = "https://test.endpoint.com";
 
     private UcfunnelBidder ucfunnelBidder;

src/test/java/org/prebid/server/bidder/yieldlab/YieldlabBidderTest.java

@@ -43,6 +43,7 @@
 import static org.assertj.core.api.Assertions.within;
 
 public class YieldlabBidderTest extends VertxTest {
+
     private static final String ENDPOINT_URL = "https://test.endpoint.com";
 
     private YieldlabBidder yieldlabBidder;

src/test/java/org/prebid/server/it/AdgenerationTest.java

@@ -21,6 +21,7 @@
 
 @RunWith(SpringRunner.class)
 public class AdgenerationTest extends IntegrationTest {
+
     @Test
     public void openrtb2AuctionShouldRespondWithBidsFromAdgeneration() throws IOException, JSONException {
         // given

src/test/java/org/prebid/server/it/UcfunnelTest.java

@@ -20,6 +20,7 @@
 
 @RunWith(SpringRunner.class)
 public class UcfunnelTest extends IntegrationTest {
+
     @Test
     public void openrtb2AuctionShouldRespondWithBidsFromUcfunnel() throws IOException, JSONException {
         // given

src/test/java/org/prebid/server/metric/CookieSyncMetricsTest.java

@@ -6,6 +6,7 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 public class CookieSyncMetricsTest {
+
     @Test
     public void forBidderShouldReturnSameBidderCookieSyncMetricsOnSuccessiveCalls() {
         // given

src/test/java/org/prebid/server/privacy/gdpr/tcfstrategies/purpose/typestrategies/BasicEnforcePurposeStrategyTest.java

@@ -25,6 +25,7 @@
 import static org.mockito.BDDMockito.given;
 
 public class BasicEnforcePurposeStrategyTest {
+
     private static final int PURPOSE_ID = 1;
 
     @Rule

src/test/java/org/prebid/server/privacy/gdpr/tcfstrategies/purpose/typestrategies/FullEnforcePurposeStrategyTest.java

@@ -32,6 +32,7 @@
 import static org.mockito.Mockito.verifyZeroInteractions;
 
 public class FullEnforcePurposeStrategyTest {
+
     private static final int PURPOSE_ID = 1;
 
     @Rule

src/test/java/org/prebid/server/privacy/gdpr/tcfstrategies/purpose/typestrategies/NoEnforcePurposeStrategyTest.java

@@ -25,6 +25,7 @@
 import static org.mockito.BDDMockito.given;
 
 public class NoEnforcePurposeStrategyTest {
+
     private static final int PURPOSE_ID = 1;
 
     @Rule