feat: support listing all branches (#178)

Also added convenience method for making a stream of paginated results

src/main/java/com/spotify/github/async/Async.java

@@ -0,0 +1,37 @@
+/*-
+ * -\-\-
+ * github-api
+ * --
+ * Copyright (C) 2024 Spotify AB
+ * --
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * -/-/-
+ */
+
+package com.spotify.github.async;
+
+import java.util.stream.Stream;
+
+import static java.util.stream.StreamSupport.stream;
+
+/** Async class to facilitate async operations. */
+public class Async {
+    private Async() {
+        throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
+    }
+
+    public static <T> Stream<T> streamFromPaginatingIterable(final Iterable<AsyncPage<T>> iterable) {
+        return stream(iterable.spliterator(), false)
+                   .flatMap(page -> stream(page.spliterator(), false));
+    }
+}

src/main/java/com/spotify/github/v3/clients/RepositoryClient.java

@@ -546,15 +546,28 @@ public CompletableFuture<Branch> getBranch(final String branch) {
   }
 
   /**
-   * Get a specific branch.
+   * List some branches in repository.
+   * Doesn't return more than 30 branches.
+   * Use {@link RepositoryClient#listAllBranches} instead to get all branches.
    *
-   * @return list of all branches in repository
+   * @return list of 30 branches in repository
    */
   public CompletableFuture<List<Branch>> listBranches() {
     final String path = String.format(LIST_BRANCHES_TEMPLATE, owner, repo);
     return github.request(path, LIST_BRANCHES);
   }
 
+    /**
+   * List all branches in repository
+   *
+   * @return list of all branches in repository
+   */
+  public Iterator<AsyncPage<Branch>> listAllBranches() {
+    final String path = String.format(LIST_BRANCHES_TEMPLATE, owner, repo);
+    return new GithubPageIterator<>(new GithubPage<>(github, path, LIST_BRANCHES));
+  }
+
+
   /**
    * Delete a comment for a given id.
    *

src/test/java/com/spotify/github/v3/clients/IssueClientTest.java

@@ -28,7 +28,6 @@
 import static java.nio.charset.Charset.defaultCharset;
 import static java.util.concurrent.CompletableFuture.completedFuture;
 import static java.util.stream.Collectors.toList;
-import static java.util.stream.StreamSupport.stream;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.core.Is.is;
 import static org.mockito.ArgumentMatchers.anyString;
@@ -38,6 +37,7 @@
 
 import com.google.common.collect.Lists;
 import com.google.common.io.Resources;
+import com.spotify.github.async.Async;
 import com.spotify.github.async.AsyncPage;
 import com.spotify.github.jackson.Json;
 import com.spotify.github.v3.comment.Comment;
@@ -81,10 +81,7 @@ public void testCommentPaginationSpliterator() throws IOException {
         .thenReturn(completedFuture(lastPageResponse));
 
     final Iterable<AsyncPage<Comment>> pageIterator = () -> issueClient.listComments(123);
-    final List<Comment> listComments =
-        stream(pageIterator.spliterator(), false)
-            .flatMap(page -> stream(page.spliterator(), false))
-            .collect(toList());
+    final List<Comment> listComments = Async.streamFromPaginatingIterable(pageIterator).collect(toList());
 
     assertThat(listComments.size(), is(30));
     assertThat(listComments.get(0).id(), is(1345268));

src/test/java/com/spotify/github/v3/clients/RepositoryClientTest.java

@@ -34,7 +34,6 @@
 import static java.lang.String.format;
 import static java.nio.charset.Charset.defaultCharset;
 import static java.util.concurrent.CompletableFuture.completedFuture;
-import static java.util.stream.StreamSupport.stream;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.core.Is.is;
 import static org.junit.jupiter.api.Assertions.assertFalse;
@@ -48,6 +47,7 @@
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Lists;
 import com.google.common.io.Resources;
+import com.spotify.github.async.Async;
 import com.spotify.github.async.AsyncPage;
 import com.spotify.github.jackson.Json;
 import com.spotify.github.v3.comment.Comment;
@@ -139,10 +139,7 @@ public void listAuthenticatedUserRepositories() throws Exception {
     when(github.request("/user/repos")).thenReturn(completedFuture(pageResponse));
 
     final Iterable<AsyncPage<Repository>> pageIterator = () -> repoClient.listAuthenticatedUserRepositories(ImmutableAuthenticatedUserRepositoriesFilter.builder().build());
-    final List<Repository> repositories =
-        stream(pageIterator.spliterator(), false)
-            .flatMap(page -> stream(page.spliterator(), false))
-            .collect(Collectors.toList());
+    final List<Repository> repositories = Async.streamFromPaginatingIterable(pageIterator).collect(Collectors.toList());
 
     assertThat(repositories.get(0).id(), is(1296269));
     assertThat(repositories.size(), is(1));
@@ -473,6 +470,17 @@ public void listBranches() throws Exception {
     assertThat(branches.size(), is(1));
   }
 
+  @Test
+  void listAllBranches() throws Exception {
+    final String link = "<https://github.com/api/v3/repos/someowner/somerepo/branches>; rel=\"last\"";
+    final Response response = createMockResponse(link, getFixture( "list_branches.json"));
+
+    when(github.request("/repos/someowner/somerepo/branches"))
+        .thenReturn(completedFuture(response));
+    final List<Branch> branches = Async.streamFromPaginatingIterable(repoClient::listAllBranches).collect(Collectors.toList());
+    assertThat(branches.get(0).commit().sha(), is("c5b97d5ae6c19d5c5df71a34c7fbeeda2479ccbc"));
+    assertThat(branches.size(), is(1));
+  }
 
   @Test
   public void testCommentCreated() throws IOException {

src/test/java/com/spotify/github/v3/clients/TeamClientTest.java

@@ -28,26 +28,24 @@
 import static java.nio.charset.Charset.defaultCharset;
 import static java.util.concurrent.CompletableFuture.completedFuture;
 import static java.util.stream.Collectors.toList;
-import static java.util.stream.StreamSupport.stream;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.core.Is.is;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.*;
 
 import com.google.common.io.Resources;
+import com.spotify.github.async.Async;
 import com.spotify.github.async.AsyncPage;
 import com.spotify.github.jackson.Json;
 import com.spotify.github.v3.Team;
 import com.spotify.github.v3.User;
-import com.spotify.github.v3.comment.Comment;
 import com.spotify.github.v3.orgs.Membership;
 import com.spotify.github.v3.orgs.TeamInvitation;
 import com.spotify.github.v3.orgs.requests.MembershipCreate;
 import com.spotify.github.v3.orgs.requests.TeamCreate;
 import com.spotify.github.v3.orgs.requests.TeamUpdate;
 import java.io.IOException;
-import java.util.Iterator;
 import java.util.List;
 import java.util.concurrent.CompletableFuture;
 import okhttp3.Response;
@@ -184,10 +182,7 @@ public void listTeamMembersPaged() throws Exception {
                 .thenReturn(completedFuture(lastPageResponse));
 
     final Iterable<AsyncPage<User>> pageIterator = () -> teamClient.listTeamMembers("1", 1);
-    final List<User> users =
-            stream(pageIterator.spliterator(), false)
-                    .flatMap(page -> stream(page.spliterator(), false))
-                    .collect(toList());
+    final List<User> users = Async.streamFromPaginatingIterable(pageIterator).collect(toList());
 
     assertThat(users.size(), is(2));
     assertThat(users.get(0).login(), is("octocat"));