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PlantUML is a component that allows to quickly write diagrams from text.

There is a newer version: 1.2024.8

// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
package net.sourceforge.plantuml.tim.stdlib;

import java.util.List;
import java.util.Map;
import java.util.Set;

import net.sourceforge.plantuml.json.JsonArray;
import net.sourceforge.plantuml.json.JsonObject;
import net.sourceforge.plantuml.json.JsonValue;
import net.sourceforge.plantuml.tim.EaterException;
import net.sourceforge.plantuml.tim.EaterExceptionLocated;
import net.sourceforge.plantuml.tim.TContext;
import net.sourceforge.plantuml.tim.TFunctionSignature;
import net.sourceforge.plantuml.tim.TMemory;
import net.sourceforge.plantuml.tim.expression.TValue;
import net.sourceforge.plantuml.utils.LineLocation;

public class GetJsonKey extends SimpleReturnFunction {

	public TFunctionSignature getSignature() {
		return new TFunctionSignature("%get_json_keys", 1);
	}

	public boolean canCover(int nbArg, Set namedArgument) {
		return nbArg == 1;
	}

	public TValue executeReturnFunction(TContext context, TMemory memory, LineLocation location, List values,
			Map named) throws EaterException, EaterExceptionLocated {
		final TValue data = values.get(0);
		if (data.isJson() == false)
			throw EaterException.unlocated("Not JSON data");
		final JsonValue json = data.toJson();
		if (json.isObject()) {
			final JsonObject object = (JsonObject) json;
			final JsonArray result = new JsonArray();
			for (String key : object.names())
				result.add(key);
			return TValue.fromJson(result);
		}
		if (json.isArray()) {
			final JsonArray array = (JsonArray) json;
			final JsonArray result = new JsonArray();
			for (JsonValue tmp : array) {
				final JsonObject object = (JsonObject) tmp;
				for (String key : object.names())
					result.add(key);
			}
			return TValue.fromJson(result);
		}

		throw EaterException.unlocated("Bad JSON type");

	}

}