编写 Jolt 变换

Question

我正在尝试为下面的输入 json 编写一个 Jolt Transformation。

{
"templateLanguage": "FREEMARKER",
"outputFormat": "JSON",
"templateName": "MPX",
"data": {
    "DSID": "36455-001",
    "media": {
     "subtitle": [
            {
                "fileName": "Tiger_s_Apprentice_The_caption_5005141918_202401030424.vtt",
                "filePath": "ingest/viacom/paramountdvhdrsdr/8100132118",
                "materialSubType": "Feature",
                "locale": "es-419"
            }
        ],
        "caption": [
            {
                "fileName": "Tiger_s_Apprentice_The_36455_001_FTR_CCAP_T3092_Closed_Caption_SCC_2398_engCC_5005136914_202401030425.scc",
                "filePath": "ingest/viacom/paramountdvhdrsdr/8100132118",
                "materialSubType": "Feature",
                "locale": "en-US"
            }
        ],
    "audio": [
            {
                "fileName": "Tiger_s_Apprentice_The_36455_001_FTR_AOUTPUT_A4970_Audio_BWF_2398_5_1_Interleaved_engAU_5005143352.wav",
                "channels": "6",
                "filePath": "ingest/viacom/paramountdvhdrsdr/8100132118",
                "materialSubType": "Feature",
                "locale": "en-US",
                "type": "5.1 Surround"
            },
            {
                "dvs": true,
                "fileName": "Tiger_s_Apprentice_The_36455_001_FTR_AOUTPUT_A4964_Audio_BWF_2398_2_0_Interleaved_engAU_5005143913.wav",
                "channels": "2",
                "filePath": "ingest/viacom/paramountdvhdrsdr/8100132118",
                "materialSubType": "Feature",
                "locale": "en-US",
                "type": "2.0 Stereo (L/R)"
            }
        ]
    }
}
}

输出 JSON 应如下所示：

{
"videos":[{
  "textTracks" : [ {
    "techSpec" : {
      "type" : "subtitle",
      "locale" : "es-419",
      "filePath" : "ingest/viacom/paramountdvhdrsdr/8100132118"
    },
    "fileName" : "Tiger_s_Apprentice_The_caption_5005141918_202401030424.vtt"
  },
   {
    "techSpec" : {
      "type" : "caption",
      "locale" : "es-US",
      "filePath" : "ingest/viacom/paramountdvhdrsdr/8100132118"
    },
    "fileName" : "Tiger_s_Apprentice_The_36455_001_FTR_CCAP_T3092_Closed_Caption_SCC_2398_engCC_5005136914_202401030425.scc"
  }

  ],
  "audios" : [ {
    "fileName" : "Tiger_s_Apprentice_The_36455_001_FTR_AOUTPUT_A4970_Audio_BWF_2398_5_1_Interleaved_engAU_5005143352.wav",
    "techSpec" : {
      "locale" : "en-US",
      "filePath" : "ingest/viacom/paramountdvhdrsdr/8100132118",
      "materialSubType" : "Feature",
      "type" : "5.1 Surround"
    }
  }, {
    "fileName" : "Tiger_s_Apprentice_The_36455_001_FTR_AOUTPUT_A4964_Audio_BWF_2398_2_0_Interleaved_engAU_5005143913.wav",
    "techSpec" : {
      "locale" : "en-US",
      "dvs" : true,
      "filePath" : "ingest/viacom/paramountdvhdrsdr/8100132118",
      "materialSubType" : "Feature",
      "type" : "2.0 Stereo (L/R)"
    }
  } ],
  "mediaMetadata" : [ {
    "fileName" : "Tiger_s_Apprentice_The_36455_001_FTR_DOC_Document_Color_Spec_16x9LB_engPT_5005134061.xml",
    "techSpec" : {
      "filePath" : "ingest/viacom/paramountdvhdrsdr/8100132118"
    }
  } ]
  
  }]
 }

我尝试了以下 Jolt Spec，但它没有按预期工作。

[{
  "operation": "shift",
  "spec": {
    "data": {
      "media": {
        "thumbnail": {
          "*": {
            "fileName": "images[&1].fileName",
            "filePath": "images[&1].techSpec.filePath"
          }
        },
        "subtitle": {
          "*": {
            "fileName": "textTracks[&1].fileName",
            "#subtitle": "textTracks[&1].techSpec.type",
            "locale": "textTracks[&1].techSpec.locale",
            "filePath": "textTracks[&1].techSpec.filePath"
          }
        },
        "caption": {
          "*": {
            "fileName": "textTracks[&2].fileName",
            "#caption": "textTracks[&2].techSpec.type",
            "locale": "textTracks[&2].techSpec.locale",
            "filePath": "textTracks[&2].techSpec.filePath"
          }
        }   
    }
}
}
}]

我尝试更改我的 Jolt 规格，但视频作为外部数组和带有字幕和标题的文本轨道作为不同对象无法按预期工作。

Answer 1

您可以使用以下 shift 转换：

[ // accumulate subtitle and caption objects into the common object
  {
    "operation": "shift",
    "spec": {
      "data": {
        "media": {
          "subtitle|caption": { // make the node common by prefixing them as "sc"
            "*": {
              "fileName": "sc.textTracks.&",
              "$1": "sc.textTracks.techSpec[&1].type",
              "locale|filePath": "sc.textTracks.techSpec[&1].&"
            }
          },
          "audio": {
            "*": {
              "fileName": "&2s[&1].&", // prefix sub-elements by audios through 
                                       // use of &2 and the letter s
              "locale|filePath|*ype": "&2s[&1].techSpec.&"
            }
          }
        }
      }
    }
  },
  {
    "operation": "shift",
    "spec": {
      "sc": { // loop through all sc in order to separate the components of the
             //  arrays into different objects respectively by the index values 
             // of those arrays such as 0,1..
        "*": {
          "*": {
            "*": {
              "*": {
                "*": {
                  "@": "videos[0].&5.&4.[&1].&2"
                }
              }
            }
          }
        }
      },
      "*": "videos[0].&"
    }
  }
]