private com.google.protobuf.SingleFieldBuilderV3<
        com.intellij.execution.process.mediator.common.rpc.DataChunk, com.intellij.execution.process.mediator.common.rpc.DataChunk.Builder, com.intellij.execution.process.mediator.common.rpc.DataChunkOrBuilder> 
        getChunkFieldBuilder() {
      if (chunkBuilder_ == null) {
        if (!(fileHandleOrBufferCase_ == 2)) {
          fileHandleOrBuffer_ = com.intellij.execution.process.mediator.common.rpc.DataChunk.getDefaultInstance();
        }
        chunkBuilder_ = new com.google.protobuf.SingleFieldBuilderV3<
            com.intellij.execution.process.mediator.common.rpc.DataChunk, com.intellij.execution.process.mediator.common.rpc.DataChunk.Builder, com.intellij.execution.process.mediator.common.rpc.DataChunkOrBuilder>(
                (com.intellij.execution.process.mediator.common.rpc.DataChunk) fileHandleOrBuffer_,
                getParentForChildren(),
                isClean());
        fileHandleOrBuffer_ = null;
      }
      fileHandleOrBufferCase_ = 2;
      onChanged();
      return chunkBuilder_;
    }
private com.google.protobuf.SingleFieldBuilderV3<
        com.intellij.execution.process.mediator.common.rpc.DataChunk, com.intellij.execution.process.mediator.common.rpc.DataChunk.Builder, com.intellij.execution.process.mediator.common.rpc.DataChunkOrBuilder> 
        getChunkFieldBuilder()