Get a value list of a enum to a json object-CodePudding

I want to create a json object with values of "3D Tour", "Videos", "Photos Only", etc. You can find the enum class below. How can I implement that?

package com.padgea.listing.application.dto;

public enum General implements Catalogue {

Tour("3D Tour"),
Videos("Videos"),
Photos_Only("Photos Only"),
Price_Reduced("Price Reduced"),
Furnished("Furnished"),
Luxury("Luxury");

private final String value;

General(String value) {
    this.value = value;
}

public String getValue() {
    return value;
}

}

I need a output like this {General : "3D Tour","Videos","Photos Only",etc}

CodePudding user response：

This will return a list of strings containing all the values.

    enum General implements Catalogue {

    Tour("3D Tour"),
    Videos("Videos"),
    Photos_Only("Photos Only"),
    Price_Reduced("Price Reduced"),
    Furnished("Furnished"),
    Luxury("Luxury");

    private final String value;

    General(String value) {
        this.value = value;
    }

    public String getValue() {
        return value;
    }
    
    public static List<String> valuesList() {
        return Arrays.stream(General.values())
                          .map(General::getValue)
                          .collect(Collectors.toList());
    }
}

And a level up you'll do something like

myJson.put("General", General.valuesList())

An output will be

 {
    "General": ["3D Tour","Videos","Photos Only"]
 }

CodePudding user response：

The valid JSON would look like this

{
    "General": ["3D Tour","Videos","Photos Only"]
}

If you would use Jackson library for creating your JSON you would need to create a class like this:

public class GeneralDTO {
    @JsonProperty("General")
    private String[] general;

    ...
}

Then you would need to create your GeneralDTO object.

You can get all your enum values in an array like this

String[] generalArray = Arrays.stream(General.values())
    .map(st -> st.getValue())
    .toArray(String[]::new);

Then using the method writeValueAsString of ObjectMapper class (part of Jackson library) you can get JSON string from your GeneralDTO object.

To simplify you can use Map<String, String[]> instead of GeneralDTO

Map<String, String[]> generalObject = new HashMap<>;
generalObject.put("General", generalArray);
ObjectMapper objectMapper = new ObjectMapper();
String json = objectMapper.writeValueAsString(generalObject);