Convert string with nested characters into specific json like format in java

Question

There's a string like:

String query = "param1, param2, param3{npam1, npam2, npam3{nipam1, nipam2}}";

This string needs to be processed in the format:

{

    param1: param1, 
    param2: param2, 
    param3: {

        npam1: param3.npam1, 
        npam2: param3.npam2, 
        npam3: {

            nipam1: param3.npam3.nipam1, 
            nipam2: param3.npam3.nipam2

        }

    }

}

Have already done till 2 nested, but the point is the string to query can be extended to any number of nested curls.

I formatted your question a little. Hope your expected output is in format I assumed is expected. If not feel free to rollback my changes. — Pshemo
– Pshemo, Commented Jan 29, 2020 at 14:35

Jorge Arguedas Arrieta · Accepted Answer · 2020-01-29 19:38:52Z

1

What I did was to iterate over the objects in the string and then iterate over the attributes of each object. Hopefully, it will help you to solve your problem. Also in your initial String, you are missing the open parenthesis and the close parenthesis so I added them.

    String jsonWithOutFormat = "param1, param2, param3{npam1, npam2, npam3{nipam1, nipam2}}";
    jsonWithOutFormat = jsonWithOutFormat.replaceAll(" ", "");
    String json = "";
    String[] objectsInString = jsonWithOutFormat.split("[{]");
    List<String> nestedObjects = new ArrayList<>();
    json += "{";
    for (int i = 0; i < objectsInString.length; i++) {
        String[] objectAttributes = objectsInString[i].split("[,]");
        if(i==0)
            nestedObjects.add(objectAttributes[objectAttributes.length-1] + ".");
        else
            nestedObjects.add(nestedObjects.get(i-1)+objectAttributes[objectAttributes.length-1] + ".");
        for (int j = 0; j < objectAttributes.length; j++) {
            if(!(j == objectAttributes.length-1)) {
                if(i != 0)
                    json+=  objectAttributes[j] + ": " +  nestedObjects.get(i-1) + objectAttributes[j]  + ", ";
                else
                    json+=  objectAttributes[j] + "\"" + ": " + "\"" + objectAttributes[j] + "\"" + ", ";
            }
            else {
                if(!(i == objectsInString.length-1))
                    json+=  objectAttributes[j] + ": {";
                else {
                    json+= objectAttributes[j].replaceAll("}", "")  + ": " + nestedObjects.get(i-1) + objectAttributes[j];
                }
            }
        }
    }
    json += "}";
    System.out.print("\n" + json);
}

edited Jan 29, 2020 at 19:38

answered Jan 29, 2020 at 17:04

Jorge Arguedas Arrieta

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6 Comments

ekansh Over a year ago

Thanks. But instead of npam3: { nipam1: param3.npam3.nipam1, nipam2: param3.npam3.nipam2 } The Output is: npam3: { nipam1: nipam1, nipam2: nipam2 }

Jorge Arguedas Arrieta Over a year ago

You are right, I add some changes to the code, let me know if that work for you

ekansh Over a year ago

Thanks! It is working. But, as said if I insert a nested object like in this case: opam1 inside like: param1, param2, param3{npam1, npam2, npam3{nipam1{opam1}, nipam2}}, it results into: { npam3: { nipam1: {opam1} : param3.npam3.nipam1.opam1, nipam2: param3.npam3.nipam2 } Instead, in the key value of nested objects, no curls should be there.

ekansh Over a year ago

It's not providing the same schema as the output for more deeper nested objects. Can you please help. Thanks!

Jorge Arguedas Arrieta Over a year ago

Nice to heard that, you can edit the answer to share it with others.

|

ekansh · Accepted Answer · 2020-01-30 16:22:02Z

Thanks Jorge. This method can be called to produce json in desired format, by passing the actual String (the one that is not formatted).

public String expressionConstruct(String jsonWithOutFormat) {

    jsonWithOutFormat = jsonWithOutFormat.replaceAll(" ", "");
    String json = "";
    String[] objectsInString = jsonWithOutFormat.split("[{]");
    List<String> nestedObjects = new ArrayList<>();
    json += "{";
    for (int i = 0; i < objectsInString.length; i++) {
        String[] objectAttributes = objectsInString[i].split("[,]");
        if(i==0)
            nestedObjects.add(objectAttributes[objectAttributes.length-1] + ".");
        else
            nestedObjects.add(nestedObjects.get(i-1)+objectAttributes[objectAttributes.length-1] + ".");
        for (int j = 0; j < objectAttributes.length; j++) {
            if(!(j == objectAttributes.length-1)) {
                if(i != 0)
                    json+=  objectAttributes[j].replaceAll("}", "") + ": " +  nestedObjects.get(i-1) + objectAttributes[j]  + ", ";
                else
                    json+=  objectAttributes[j] + ": " + objectAttributes[j] + ", ";
            }
            else {
                if(!(i == objectsInString.length-1))
                    json+=  objectAttributes[j] + ": {";
                else {
                    json+= objectAttributes[j].replaceAll("}", "")  + ": " + nestedObjects.get(i-1) + objectAttributes[j];
                }
            }
        }
    }
    json += "}";
    return json;

}

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