How to write JOLT Spec for nested arrays? newbie here - arrays

Question

i am really newbie on Jolt and try to solve this:
input JSON :
[
{
"id": 528356,
"version": 0,
"name": "ActiveMQ",
"nameUnique": true,
"config": {
"id": 528356,
"version": 0,
"type": "JMX_METRIC_RULE_COLLECTION",
"name": "ActiveMQ",
"description": "Default Config",
"enabled": true,
"children": [
{
"id": 2638137,
"version": 0,
"jmxCollectionId": 528356,
"type": "JMX_METRIC_RULE",
"name": "ActiveMQ_Brokers",
"exclude": false,
"enabled": true,
"metricCategory": "Broker",
"instanceIdentifier": "BrokerName"
},
{
"id": 2638138,
"version": 0,
"jmxCollectionId": 528356,
"type": "JMX_METRIC_RULE",
"name": "ActiveMQ_Queues",
"exclude": false,
"enabled": true,
"metricCategory": "Queues",
"instanceIdentifier": "Destination"
},
{
"id": 2638139,
"version": 0,
"jmxCollectionId": 528356,
"type": "JMX_METRIC_RULE",
"name": "ActiveMQ_Topics",
"exclude": false,
"enabled": true,
"metricCategory": "Topics",
"instanceIdentifier": "Destination"
}
],
"applicationId": 46546
},
"type": "JMX_METRIC_RULE_COLLECTION"
},
{
"id": 528358,
"version": 0,
"name": "Coherence",
"nameUnique": true,
"config": {
"id": 528358,
"version": 0,
"type": "JMX_METRIC_RULE_COLLECTION",
"name": "Coherence",
"description": "Default Config",
"enabled": true,
"children": [
{
"id": 2638146,
"version": 0,
"jmxCollectionId": 528358,
"type": "JMX_METRIC_RULE",
"name": "Coherence_Caches",
"exclude": false,
"enabled": true,
"metricCategory": "Coherence|Cache Maps",
"instanceIdentifier": "service,name,nodeId"
},
{
"id": 2638147,
"version": 0,
"jmxCollectionId": 528358,
"type": "JMX_METRIC_RULE",
"name": "Coherence_Cluster",
"exclude": false,
"enabled": true,
"metricCategory": "Coherence|Cluster",
"instanceIdentifier": null
}
],
"applicationId": 46546
},
"type": "JMX_METRIC_RULE_COLLECTION"
}
]
Desired output :
[
{
"name": "ActiveMQ",
"children": [
{
"name": "ActiveMQ_Brokers"
},
{
"name": "ActiveMQ_Queues"
},
{
"name": "ActiveMQ_Topics"
}
]
},
{
"name": "Coherence",
"children": [
{
"name": "Coherence_Caches"
},
{
"name": "Coherence_Cluster"
}
]
}
]
at the moment, just able to get something using spec :
[
{
"operation": "shift",
"spec": {
"*": {
"config": {
"name": "[].parent",
"children": {
"*": {
"name": "[].child"
}
}
}
}
}
}
]
Current output :
[
{
"parent": "ActiveMQ"
},
{
"child": "ActiveMQ_Brokers"
},
{
"child": "ActiveMQ_Queues"
},
{
"child": "ActiveMQ_Topics"
},
{
"parent": "Coherence"
},
{
"child": "Coherence_Caches"
},
{
"child": "Coherence_Cluster"
}
]
in short, did not find a way to correctly map using keys.
thanks for help.

Answer 1

Need to unite the result at some levels of nodes such like in the following spec
[
{
"operation": "shift",
"spec": {
"*": {
"config": {
"name": "[&2].&", //"[&2]" stands for reaching the indexes at uppermost level, "&" copies the literal "name" as attribute's key name.
"children": {
"*": {
"name": "[&4].&2[&1].&" //"[&4]" is needed to traverse two more levels to reach the same level what the above attribute("config.name") needs, "&2" copies the literal "children" after going two levels up the tree, "[&1]" is sub-indexes of it, "&" copies the literal "name"
}
}
}
}
}
}
]