add: Group#getMembers method

Author: MidCoard

src/main/java/top/focess/qq/api/bot/Group.java

@@ -1,5 +1,9 @@
 package top.focess.qq.api.bot;
 
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+import java.util.List;
+
 public interface Group extends Speaker{
 
     /**
@@ -22,5 +26,11 @@ public interface Group extends Speaker{
      */
     Member getMemberOrFail(long id);
 
+    /**
+     * Get the group's all members
+     * @return the all members
+     */
+    @NonNull
+    List<Member> getMembers();
 
 }

src/main/java/top/focess/qq/core/bot/SimpleGroup.java

@@ -1,12 +1,16 @@
 package top.focess.qq.core.bot;
 
 import com.google.common.collect.Maps;
+import org.checkerframework.checker.nullness.qual.NonNull;
 import org.jetbrains.annotations.Nullable;
 import top.focess.qq.api.bot.Bot;
 import top.focess.qq.api.bot.Group;
 import top.focess.qq.api.bot.Member;
 
+import java.util.List;
 import java.util.Map;
+import java.util.Objects;
+import java.util.stream.Collectors;
 
 public class SimpleGroup extends SimpleSpeaker implements Group {
 
@@ -51,6 +55,12 @@ public Member getMember(long id) {
 
     @Override
     public Member getMemberOrFail(long id) {
-        return SimpleMember.get(this,this.nativeGroup.getOrFail(id));
+        return Objects.requireNonNull(SimpleMember.get(this,this.nativeGroup.getOrFail(id)));
     }
+
+    @Override
+    public @NonNull List<Member> getMembers() {
+        return this.nativeGroup.getMembers().stream().map(i -> SimpleMember.get(this,i)).collect(Collectors.toList());
+    }
+
 }