[ggj][ast] fix: add varargs to AnonClass and Ref setter methods (#400)

* fix: refactor requestBuilder into separate method in ServiceClientClassComposer

* feat: add varargs to AnonClass and ref setter methods

Author: miraleung

src/main/java/com/google/api/generator/engine/ast/AnonymousClassExpr.java

@@ -17,6 +17,7 @@
 import com.google.auto.value.AutoValue;
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 
@@ -45,6 +46,10 @@ public static Builder builder() {
   public abstract static class Builder {
     public abstract Builder setType(TypeNode type);
 
+    public Builder setMethods(MethodDefinition... methods) {
+      return setMethods(Arrays.asList(methods));
+    }
+
     public abstract Builder setMethods(List<MethodDefinition> methods);
 
     public abstract Builder setStatements(List<Statement> statements);

src/main/java/com/google/api/generator/engine/ast/ConcreteReference.java

@@ -16,6 +16,7 @@
 
 import com.google.auto.value.AutoValue;
 import com.google.common.collect.ImmutableList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
 import javax.annotation.Nullable;
@@ -210,7 +211,11 @@ public abstract static class Builder {
 
     public abstract Builder setWildcardUpperBound(Reference reference);
 
-    public abstract Builder setGenerics(List<Reference> clazzes);
+    public Builder setGenerics(Reference... references) {
+      return setGenerics(Arrays.asList(references));
+    }
+
+    public abstract Builder setGenerics(List<Reference> references);
 
     public abstract Builder setIsStaticImport(boolean isStaticImport);
 

src/main/java/com/google/api/generator/engine/ast/VaporReference.java

@@ -17,6 +17,7 @@
 import com.google.auto.value.AutoValue;
 import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
 import javax.annotation.Nullable;
@@ -146,6 +147,10 @@ public abstract static class Builder {
 
     public abstract Builder setUseFullName(boolean useFullName);
 
+    public Builder setGenerics(Reference... references) {
+      return setGenerics(Arrays.asList(references));
+    }
+
     public abstract Builder setGenerics(List<Reference> clazzes);
 
     public abstract Builder setEnclosingClassName(String enclosingClassName);