package com.devbliss.doctest.utils;
import java.util.List;
import com.google.gson.ExclusionStrategy;
import com.google.gson.FieldAttributes;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
/**
* Utils class used to transform object into json-formatted {@link String}
*
* @author bmary
* @author mbankmann
*
*/
public class JSONHelper {
/**
* Converts the given POJO into a Json representation.
*
* @param obj
* @return
*/
public String toJson(Object obj) {
return toJson(obj, false);
}
/**
*
* Converts the given POJO into a Json representation.
* If prettyPrint is true, the output will be nicely formatted.
*
* @param obj
* @param prettyPrint
* @return
*/
public String toJson(Object obj, boolean prettyPrint) {
GsonBuilder builder = new GsonBuilder();
if (prettyPrint) {
builder.setPrettyPrinting();
}
return builder.create().toJson(obj);
}
/**
*
* Converts the given POJO to Json and will skip the given fields while doing so.
*
* @param obj
* @param excludedFields
* @return
*/
public String toJsonAndSkipCertainFields(Object obj, final List<String> excludedFields) {
return toJsonAndSkipCertainFields(obj, excludedFields, false);
}
/**
*
* Converts the given POJO and will skip the given fields while doing so.
* If prettyPrint is true, the output will be nicely formatted.
*
* @param obj
* @param excludedFields
* @param prettyPrint
* @return
*/
public String toJsonAndSkipCertainFields(Object obj, final List<String> excludedFields,
boolean prettyPrint) {
ExclusionStrategy strategy = new ExclusionStrategy() {
public boolean shouldSkipField(FieldAttributes f) {
if (excludedFields.contains(f.getName())) {
return true;
}
return false;
}
public boolean shouldSkipClass(Class<?> clazz) {
return false;
}
};
GsonBuilder builder =
new GsonBuilder().addSerializationExclusionStrategy(strategy)
.addDeserializationExclusionStrategy(strategy);
if (prettyPrint)
builder.setPrettyPrinting();
return builder.create().toJson(obj);
}
public boolean isJsonValid(String json) {
return json != null && !json.equals("null") && !json.isEmpty() && json.startsWith("{");
}
/**
*
* Pretty prints any json input.
*
* @param json
* @return
*/
public String prettyPrintJson(String json) {
if (!isJsonValid(json)) {
return json;
}
Gson gson = new GsonBuilder().setPrettyPrinting().create();
JsonParser jp = new JsonParser();
JsonElement je = jp.parse(json);
String returnvalue = gson.toJson(je);
return returnvalue;
}
}