How to implement the custom converter for a field using Spring Data Elasticsearch?-CodePudding

I need to implement a custom converter in spring data elastic-search. I need to concatenate something to the text when saving and retrieving. I have seen a similar question is here. And in the answer is says it is implemented now and available. But I didn't found any example how to implement it. So anybody know how to do this?

CodePudding user response：

You can find examples in the test code of the library.

You have to create a converter:

class FooConverter implements PropertyValueConverter {

    public static final String PREFIX = "foo-";

    @Override
    public Object write(Object value) {
        return PREFIX   value.toString();
    }

    @Override
    public Object read(Object value) {

        String valueString = value.toString();

        if (valueString.startsWith(PREFIX)) {
            return valueString.substring(PREFIX.length());
        } else {
            return value;
        }
    }
}

and then register it for the property of your entity class:

@Document(indexName = "foo")
class Entity {
    
    @Field(type = FieldType.Text)
    @ValueConverter(FooConverter.class)
    private String someField;
    
    // ...
}