fix: Add support for path wildcard.

Author: blakeli0

sdk-platform-java/api-common-java/src/main/java/com/google/api/pathtemplate/PathTemplate.java

@@ -336,6 +336,7 @@ public Set<String> getResourceLiterals() {
   // If a template is /compute/v1/projects/{project}/locations/{location}, known resources are
   // "projects" and "locations", the canonical resource name is
   // projects/{project}/locations/{location}. See unit tests for all cases.
+  // Canonical resource names may be incorrect if the http template contains singleton resources.
   public String getCanonicalResourceName(Set<String> knownResources) {
     if (knownResources == null) {
       return "";
@@ -372,7 +373,8 @@ public String getCanonicalResourceName(Set<String> knownResources) {
           if (innerSeg.kind() == SegmentKind.BINDING) {
             bindingStartIndex = j;
             break;
-          } else if (innerSeg.kind() == SegmentKind.LITERAL) {
+          } else if (innerSeg.kind() == SegmentKind.LITERAL
+              || innerSeg.kind() == SegmentKind.PATH_WILDCARD) {
             literalCountInBinding++;
           }
         }

sdk-platform-java/api-common-java/src/test/java/com/google/api/pathtemplate/PathTemplateTest.java

@@ -33,6 +33,7 @@
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.truth.Truth;
+import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 import java.util.stream.Stream;
@@ -1053,6 +1054,12 @@ void testGetCanonicalResourceName_nullKnownResources() {
     Truth.assertThat(template.getCanonicalResourceName(null)).isEmpty();
   }
 
+  @Test
+  void testGetCanonicalResourceName_pathWildCard() {
+    PathTemplate template = PathTemplate.create("/v1/{resource=**}:setIamPolicy");
+    Truth.assertThat(template.getCanonicalResourceName(new HashSet<>())).isEqualTo("{resource=**}");
+  }
+
   private static void assertPositionalMatch(Map<String, String> match, String... expected) {
     Truth.assertThat(match).isNotNull();
     int i = 0;