Can Jackson be configured to deserialize the JSON Key (Not value)? - json

Question

I am trying to trim the JSON key in order to avoid spaces in the JSON requests.
JSON Object would look like with white space, (check for "eq")
{
"page": 0,
"size": 25,
"and":{
"eq ": [
{
"field":"id",
"value": "60536"
}
]
}
}
I find lot of solution ranging from SimpleModule to JsonDeserializer but all generally work on the value part. How can I trim the key itself which then correctly converts into my Java POJO?
public class SearchInDTO implements InDTO {
private Integer pageNo;
private Integer pageSize;
private ANDFilter andFilter;
#JsonProperty("page")
public Integer getPageNo() {
return pageNo;
}
public void setPageNo(Integer pageNo) {
this.pageNo = pageNo;
}
#JsonProperty("size")
public Integer getPageSize() {
return pageSize;
}
public void setPageSize(Integer pageSize) {
this.pageSize = pageSize;
}
#JsonProperty("and")
public ANDFilter getAndFilter() {
return andFilter;
}
public void setAndFilter(ANDFilter andFilter) {
this.andFilter = andFilter;
}
public static class EQFilter extends FieldValue
{
#JsonProperty("field")
public String getFieldName() {
return super.getFieldName();
}
#JsonProperty("value")
public String getValue() {
return super.getValue();
}
#Override
public String toString() {
final StringBuilder sb = new StringBuilder("EQFilter{");
sb.append(super.toString());
sb.append('}');
return sb.toString();
}
}
public static class FieldValue
{
private String fieldName;
private String value;
#JsonProperty("field")
public String getFieldName() {
return fieldName;
}
public void setFieldName(String fieldName) {
this.fieldName = fieldName;
}
#JsonProperty("value")
public String getValue() {
if(value == null) return value;
return value.toLowerCase();
}
public void setValue(String value) {
this.value = value;
}
}
public static class ANDFilter {
private List<EQFilter> eqFilters = new ArrayList<>();
#JsonProperty("eq")
public List<EQFilter> getEqFilters() {
return eqFilters;
}
public void setEqFilters(List<EQFilter> eqFilters) {
this.eqFilters = eqFilters;
}
}
}

Answer 1

Solution with custom JsonParser implementation:
public class MyJsonParser extends JsonParserDelegate {
public MyJsonParser(JsonParser parser) {
super(parser);
}
#Override
public String getCurrentName() throws IOException {
return super.getCurrentName().trim();
}
}
public class MyJsonParserFactory extends MappingJsonFactory {
#Override
protected JsonParser _createParser(InputStream in, IOContext ctxt) throws IOException {
return new MyJsonParser(super._createParser(in, ctxt));
}
#Override
protected JsonParser _createParser(Reader r, IOContext ctxt) throws IOException {
return new MyJsonParser(super._createParser(r, ctxt));
}
#Override
protected JsonParser _createParser(char[] data, int offset, int len, IOContext ctxt, boolean recyclable) throws IOException {
return new MyJsonParser(super._createParser(data, offset, len, ctxt, recyclable));
}
#Override
protected JsonParser _createParser(byte[] data, int offset, int len, IOContext ctxt) throws IOException {
return new MyJsonParser(super._createParser(data, offset, len, ctxt));
}
#Override
protected JsonParser _createParser(DataInput input, IOContext ctxt) throws IOException {
return new MyJsonParser(super._createParser(input, ctxt));
}
}
#Component
public class MyJackson2ObjectMapperBuilderCustomizer implements Jackson2ObjectMapperBuilderCustomizer {
#Override
public void customize(Jackson2ObjectMapperBuilder jacksonObjectMapperBuilder) {
jacksonObjectMapperBuilder.factory(new MyJsonParserFactory());
}
}