path: root/java/core/src/main/java/com/google/protobuf/MutabilityOracle.java

// Protocol Buffers - Google's data interchange format
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package com.google.protobuf;

/**
 * Verifies that an object is mutable, throwing if not.
 */
interface MutabilityOracle {
  static final MutabilityOracle IMMUTABLE = new MutabilityOracle() {
    @Override
    public void ensureMutable() {
      throw new UnsupportedOperationException();
    }
  };

  /**
   * Throws an {@link UnsupportedOperationException} if not mutable.
   */
  void ensureMutable();
}