Jackson parser json setter to take value as string array

Question

I have below json:

    "[{\"movieName\":\"A\",\"Leadactor\":\"\",\"leadActress\":\"\",\"movieTitle\":\"\",\"hero\":\"\",\"heroine\":\"\",\"source\":\"IMDB\"}," +
    "{\"movieName\":\"\",\"Leadactor\":\"\",\"leadActress\":\"\",\"movieTitle\":\"B\",\"hero\":\"B1\",\"heroine\":\"B2\",\"source\":\"Netflix\"}," +
    "{\"movieName\":\"C\",\"Leadactor\":\"C1\",\"leadActress\":\"C2\",\"movieTitle\":\"\",\"hero\":\"\",\"heroine\":\"\",\"source\":\"IMDB\"}," +
    "{\"movieName\":\"D\",\"Leadactor\":\"D1\",\"leadActress\":\"D2\",\"movieTitle\":\"\",\"hero\":\"\",\"heroine\":\"\",\"source\":\"IMDB\"}," +
    "{\"movieName\":\"\",\"Leadactor\":\"\",\"leadActress\":\"\",\"movieTitle\":\"E\",\"hero\":\"E1\",\"heroine\":\"E2\",\"source\":\"Netflix\"}]";

I am using jackson parser to map it to a class:

I want movieName and movieTitle to map into Name property in the java class. So i wrote the below class:

public static class MovieData {
    @JsonProperty("Name")
    private String name;

    @JsonSetter({"movieName"})
    private void setMovieName(final String name) {
            if((name != null) && (! name.equals(""))) {
                    setNameInternal(name);
            }
    }

    @JsonSetter("movieTitle")
    private void setMovieTitle(final String name) {
            if((name != null) && (! name.equals(""))) {
                    setNameInternal(name);
            }
    }

    private void setNameInternal(final String name) {
            this.name = name;
    }

}

In my real json there are so many fields like movieName, movieTitle which i want to normalize into a common name.

Is there any simple syntax like the below which can reduce code duplication:

public static class MovieData {
    @JsonProperty("Name")
    private String name;

 @JsonSetter(value = { "movieName", "movieTitle" })
 private void setName(final String name) {
        if((name != null) && (! name.equals(""))) {
                this.name=name;
        }
}
  }

The above code gave me error on jsonSetter:

 Type mismatch: cannot convert from String[] to String.

EDIT

If Jackson doesn't support it, can GSON Support this operation.

Thanks

Your question is not very clear... do you want a list of objects Movie with an attribute name, which contains the value of either "movieName" or "movieTitle"? And if, let's say, "movieName" has a value, "movieTitle" will be always emtpty? — MikO
– MikO, Commented Jun 4, 2013 at 23:50
Have you tried adding multiple annotations to setName, one for movieName and one for movieTitle? Otherwise the solution below with @JsonAnySetter will work. — Sumit
– Sumit, Commented Jun 5, 2013 at 17:03
@MikO yes i want a list of objects Movie with an attribute name, which contains the value of either movie name or movie title. Yes if movie name has a vlaue then movie title is empty. — javaMan
– javaMan, Commented Jun 5, 2013 at 18:14

Michał Ziober · Accepted Answer · 2013-06-05 15:36:17Z

You can use @JsonAnySetter, what it is mean you can find on Jackson Core (Data-Binding) Annotations page.

I have created simple bean which is related to your example:

class MovieData {

    private static List<String> NAME_PROPERTIES = Arrays.asList("movieName", "movieTitle");

    private String name;

    public void setName(String name) {
        this.name = name;
    }

    @JsonAnySetter
    private void parseUnknownProperties(String propertyName, String propertyValue) {
        if (NAME_PROPERTIES.contains(propertyName) && !propertyValue.isEmpty()) {
            this.name = propertyValue;
        }
    }

    @Override
    public String toString() {
        return name;
    }
}

Now when I deserialize your JSON in this way:

ObjectMapper objectMapper = new ObjectMapper();
System.out.println(Arrays.toString(objectMapper.readValue(json, MovieData[].class)));

As result I can see:

[A, B, C, D, E]

Andrew Barber · Accepted Answer · 2013-06-08 09:38:58Z

3

Dont do this much. it is very simple with Gson

create class for your single set record like

class Movie{
    private String movieName;
    private String Leadactor;
    private String leadActress;

    //put getter and setter for your fields
}

in main file
Type type = new TypeToken<List<Movie>>(){}.getType();
List<Movie> data = new Gson().fromJson(json_string,type);

edited Jun 8, 2013 at 9:38

Andrew Barber

40.3k20 gold badges97 silver badges124 bronze badges

answered Jun 4, 2013 at 19:09

Ingreatway

1458 bronze badges

2 Comments

javaMan Over a year ago

I know about gson. the problem is about normalization. I want movieTitle also to map into movieName;

Andrew Barber Over a year ago

Please refrain from asking people to vote/accept your answers. See this meta post for more information. Thanks!

Eugene Petrenko · Accepted Answer · 2014-06-13 10:36:35Z

0

You declare the field like @JsonProperty String[] data

and use

 new ObjectMapper()
      .enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY)
      .readValue(json, YOUT_TYPE.class)

So this option make Jackson part both "foo":"bar" and "foo": ["a", "b", "c"].

All you need to do is to merge string array back into the string with right line separators. I do it via Guava data == null ? null : Jointer.on("\n").join(data)

answered Jun 13, 2014 at 10:36

Eugene Petrenko

5,01230 silver badges36 bronze badges

Collectives™ on Stack Overflow

Jackson parser json setter to take value as string array

3 Answers 3

Comments

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related