Fix generics in EppXmlTransformer.unmarshal to not be only on the return type.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=124914271

java/google/registry/flows/EppController.java

@@ -56,7 +56,7 @@ public final class EppController {
   public byte[] handleEppCommand(SessionMetadata sessionMetadata, byte[] inputXmlBytes) {
     Trid trid = null;
     try {
-      EppInput eppInput = unmarshal(inputXmlBytes);
+      EppInput eppInput = unmarshal(EppInput.class, inputXmlBytes);
       trid = Trid.create(eppInput.getCommandWrapper().getClTrid());
       ImmutableList<String> targetIds = eppInput.getTargetIds();
       metrics.setCommandName(eppInput.getCommandName());

java/google/registry/flows/EppXmlTransformer.java

@@ -76,9 +76,15 @@ public class EppXmlTransformer  {
     OUTPUT_TRANSFORMER.validate(xml);
   }
 
-  public static <T> T unmarshal(byte[] bytes) throws EppException {
+  /**
+   * Unmarshal bytes into Epp classes.
+   *
+   * @param clazz type to return, specified as a param to enforce typesafe generics
+   * @see "http://errorprone.info/bugpattern/TypeParameterUnusedInFormals"
+   */
+  public static <T> T unmarshal(Class<T> clazz, byte[] bytes) throws EppException {
     try {
-      return INPUT_TRANSFORMER.unmarshal(new ByteArrayInputStream(bytes));
+      return INPUT_TRANSFORMER.unmarshal(clazz, new ByteArrayInputStream(bytes));
     } catch (XmlException e) {
       // If this XmlException is wrapping a known type find it. If not, it's a syntax error.
       FluentIterable<Throwable> causalChain = FluentIterable.from(Throwables.getCausalChain(e));

java/google/registry/flows/domain/DomainApplicationInfoFlow.java

@@ -87,7 +87,7 @@ public class DomainApplicationInfoFlow extends BaseDomainInfoFlow<DomainApplicat
     if (includeMarks) {
       for (EncodedSignedMark encodedMark : existingResource.getEncodedSignedMarks()) {
         try {
-          marksBuilder.add(((SignedMark) unmarshal(encodedMark.getBytes())).getMark());
+          marksBuilder.add(unmarshal(SignedMark.class, encodedMark.getBytes()).getMark());
         } catch (EppException e) {
           // This is a serious error; don't let the benign EppException propagate.
           throw new IllegalStateException("Could not decode a stored encoded signed mark");

java/google/registry/flows/domain/DomainFlowUtils.java

@@ -497,7 +497,7 @@ public class DomainFlowUtils {
 
     SignedMark signedMark;
     try {
-      signedMark = unmarshal(signedMarkData);
+      signedMark = unmarshal(SignedMark.class, signedMarkData);
     } catch (EppException e) {
       throw new SignedMarkParsingErrorException();
     }