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andrew_holbrook's avatar
andrew_holbrook
New Contributor III
8 years ago

Example of defineInputSchema for multi-level inputs

Hi, I’m trying to create an input schema for my data source. Here is an example input data format: { “data”: { “name”:“Andrew”, “value”:1}} How do I represent this “layered” schema? Can y...
andrew_holbrook's avatar
andrew_holbrook
New Contributor III
8 years ago

@aleung (and I suppose @robin), thanks but what I’m looking for more of is how to change this function (pulled from here):

public void defineInputSchema(final SchemaProvider provider) {
        Schema colA = provider.createSchema(SnapType.STRING, COL_A);
        provider.getSchemaBuilder(INPUT_VIEW_NAME)
                .withChildSchema(colA)
                .build();
    }

How do I do a nested schema?

del's avatar
del
Contributor III
8 years ago

Hey @andrew_holbrook,

I’ve played around with this code and I believe I found your solution. Using your data sample from your original post:

You’ll need to import com.snaplogic.snap.schema.api.ObjectSchema into your class and then your code will look something like this:

private static final String DATA = "data";
private static final String NAME = "name";
private static final String VALUE = "value";
private static final String INPUT_VIEW_NAME = "input0";
private static final String OUTPUT_VIEW_NAME = "output0";

@Override
public void defineInputSchema(final SchemaProvider provider) {
    ObjectSchema data = provider.createSchema(SnapType.COMPOSITE, DATA);
    Schema name = provider.createSchema(SnapType.STRING, NAME);
    Schema value = provider.createSchema(SnapType.BOOLEAN, VALUE);
    data.addChild(name);
    data.addChild(value);
    provider.getSchemaBuilder(INPUT_VIEW_NAME)
            .withChildSchema(data)
            .build();
}

I don’t know if SnapType.COMPOSITE is the correct type, but it seems to work for me.

  • andrew_holbrook's avatar
    andrew_holbrook
    New Contributor III
    8 years ago

    Thanks! Can’t wait to try this out!