1 // Protocol Buffers - Google's data interchange format 2 // Copyright 2008 Google Inc. All rights reserved. 3 // 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file or at 6 // https://developers.google.com/open-source/licenses/bsd 7 8 package com.google.protobuf; 9 10 /** Verifies that an object is mutable, throwing if not. */ 11 interface MutabilityOracle { 12 static final MutabilityOracle IMMUTABLE = 13 new MutabilityOracle() { 14 @Override 15 public void ensureMutable() { 16 throw new UnsupportedOperationException(); 17 } 18 }; 19 20 /** Throws an {@link UnsupportedOperationException} if not mutable. */ ensureMutable()21 void ensureMutable(); 22 } 23