Add copy constructor and remove APIs for Commands builder

It helps to change allowed commands from session.

PiperOrigin-RevId: 373302990

library/common/src/main/java/com/google/android/exoplayer2/Player.java

@@ -597,6 +597,11 @@ public interface Player {
         flagsBuilder = new ExoFlags.Builder();
         flagsBuilder = new ExoFlags.Builder();
       }
       }
 
 
+      private Builder(Commands commands) {
+        flagsBuilder = new ExoFlags.Builder();
+        flagsBuilder.addAll(commands.flags);
+      }
+
       /**
       /**
        * Adds a {@link Command}.
        * Adds a {@link Command}.
        *
        *
@@ -647,6 +652,43 @@ public interface Player {
       }
       }
 
 
       /**
       /**
+       * Removes a {@link Command}.
+       *
+       * @param command A {@link Command}.
+       * @return This builder.
+       * @throws IllegalStateException If {@link #build()} has already been called.
+       */
+      public Builder remove(@Command int command) {
+        flagsBuilder.remove(command);
+        return this;
+      }
+
+      /**
+       * Removes a {@link Command} if the provided condition is true. Does nothing otherwise.
+       *
+       * @param command A {@link Command}.
+       * @param condition A condition.
+       * @return This builder.
+       * @throws IllegalStateException If {@link #build()} has already been called.
+       */
+      public Builder removeIf(@Command int command, boolean condition) {
+        flagsBuilder.removeIf(command, condition);
+        return this;
+      }
+
+      /**
+       * Removes {@link Command commands}.
+       *
+       * @param commands The {@link Command commands} to remove.
+       * @return This builder.
+       * @throws IllegalStateException If {@link #build()} has already been called.
+       */
+      public Builder removeAll(@Command int... commands) {
+        flagsBuilder.removeAll(commands);
+        return this;
+      }
+
+      /**
        * Builds a {@link Commands} instance.
        * Builds a {@link Commands} instance.
        *
        *
        * @throws IllegalStateException If this method has already been called.
        * @throws IllegalStateException If this method has already been called.
@@ -665,6 +707,11 @@ public interface Player {
       this.flags = flags;
       this.flags = flags;
     }
     }
 
 
+    /** Returns a {@link Builder} initialized with the values of this instance. */
+    public Builder buildUpon() {
+      return new Builder(this);
+    }
+
     /** Returns whether the set of commands contains the specified {@link Command}. */
     /** Returns whether the set of commands contains the specified {@link Command}. */
     public boolean contains(@Command int command) {
     public boolean contains(@Command int command) {
       return flags.contains(command);
       return flags.contains(command);

library/common/src/main/java/com/google/android/exoplayer2/util/ExoFlags.java

@@ -100,6 +100,48 @@ public final class ExoFlags {
     }
     }
 
 
     /**
     /**
+     * Removes a flag.
+     *
+     * @param flag A flag.
+     * @return This builder.
+     * @throws IllegalStateException If {@link #build()} has already been called.
+     */
+    public Builder remove(int flag) {
+      checkState(!buildCalled);
+      flags.delete(flag);
+      return this;
+    }
+
+    /**
+     * Removes a flag if the provided condition is true. Does nothing otherwise.
+     *
+     * @param flag A flag.
+     * @param condition A condition.
+     * @return This builder.
+     * @throws IllegalStateException If {@link #build()} has already been called.
+     */
+    public Builder removeIf(int flag, boolean condition) {
+      if (condition) {
+        return remove(flag);
+      }
+      return this;
+    }
+
+    /**
+     * Removes flags.
+     *
+     * @param flags The flags to remove.
+     * @return This builder.
+     * @throws IllegalStateException If {@link #build()} has already been called.
+     */
+    public Builder removeAll(int... flags) {
+      for (int flag : flags) {
+        remove(flag);
+      }
+      return this;
+    }
+
+    /**
      * Builds an {@link ExoFlags} instance.
      * Builds an {@link ExoFlags} instance.
      *
      *
      * @throws IllegalStateException If this method has already been called.
      * @throws IllegalStateException If this method has already been called.