(command.CommandList
  children: [
    (C {(Id.KW_Set set)} {(-e)})
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:JAVA_DIR)
          op: assign_op.Equal
          rhs: {(${ Id.VSub_Name TRAVIS_BUILD_DIR) (/java)}
          spids: [58]
        )
      ]
    )
    (C {(pushd)} {($ Id.VSub_DollarName '$JAVA_DIR')})
    (C {(export)} 
      {(Id.Lit_VarLike 'MAVEN_OPTS=') 
        (DQ ($ Id.VSub_DollarName '$MAVEN_OPTS') (' -Dorg.slf4j.simpleLogger.defaultLogLevel=warn'))
      }
    )
    (C {(mvn)} {(-B)} {(install)})
    (command.AndOr
      ops: [Id.Op_DPipe]
      children: [
        (C {(Id.Lit_LBracket '[')} {(DQ (${ Id.VSub_Name ARROW_TRAVIS_SKIP_SITE))} {(Id.Lit_Equals '=')} 
          {(DQ (yes))} {(Id.Lit_RBracket ']')}
        )
        (C {(mvn)} {(-B)} {(site)})
      ]
    )
    (C {(popd)})
  ]
)