com.ppiech.auto.value.jackson.JsonMapper Maven / Gradle / Ivy
package com.ppiech.auto.value.jackson;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/** The class that handles all parsing and serialization of @JsonObject's */
public abstract class JsonMapper {
/**
* Parse an object from a pre-configured JsonParser object.
*
* @param jsonParser The pre-configured JsonParser
*/
public abstract T parse(JsonParser jsonParser) throws IOException;
/**
* Parse a single field from a pre-configured JsonParser object into a T instance.
*
* @param instance The instance of the object that the JsonParser should parse into
* @param fieldName The name of the field that should be parsed
* @param jsonParser The pre-configured JsonParser
*/
public abstract void parseField(T instance, String fieldName, JsonParser jsonParser) throws IOException;
/**
* Serialize an object to a pre-configured JsonGenerator object.
*
* @param object The object to serialize.
* @param generator The pre-configured JsonGenerator being written to.
* @param writeStartAndEnd True if writeStartObject() should be called before and writeEndObject() should be called after serializing. False if not.
*/
public abstract void serialize(T object, JsonGenerator generator, boolean writeStartAndEnd) throws IOException;
/**
* Parse an object from an InputStream.
*
* @param is The InputStream, most likely from your networking library.
*/
public T parse(InputStream is) throws IOException {
JsonParser jsonParser = LoganSquare.JSON_FACTORY.createParser(is);
jsonParser.nextToken();
return parse(jsonParser);
}
/**
* Parse an object from a byte array. Note: parsing from an InputStream should be preferred over parsing from a byte array if possible.
*
* @param byteArray The byte array being parsed.
*/
public T parse(byte[] byteArray) throws IOException {
JsonParser jsonParser = LoganSquare.JSON_FACTORY.createParser(byteArray);
jsonParser.nextToken();
return parse(jsonParser);
}
/**
* Parse an object from a char array. Note: parsing from an InputStream should be preferred over parsing from a char array if possible.
*
* @param charArray The char array being parsed.
*/
public T parse(char[] charArray) throws IOException {
JsonParser jsonParser = LoganSquare.JSON_FACTORY.createParser(charArray);
jsonParser.nextToken();
return parse(jsonParser);
}
/**
* Parse an object from a String. Note: parsing from an InputStream should be preferred over parsing from a String if possible.
*
* @param jsonString The JSON string being parsed.
*/
public T parse(String jsonString) throws IOException {
JsonParser jsonParser = LoganSquare.JSON_FACTORY.createParser(jsonString);
jsonParser.nextToken();
return parse(jsonParser);
}
/**
* Parse a list of objects from an InputStream.
*
* @param is The inputStream, most likely from your networking library.
*/
public List parseList(InputStream is) throws IOException {
JsonParser jsonParser = LoganSquare.JSON_FACTORY.createParser(is);
jsonParser.nextToken();
return parseList(jsonParser);
}
/**
* Parse a list of objects from a byte array. Note: parsing from an InputStream should be preferred over parsing from a byte array if possible.
*
* @param byteArray The inputStream, most likely from your networking library.
*/
public List parseList(byte[] byteArray) throws IOException {
JsonParser jsonParser = LoganSquare.JSON_FACTORY.createParser(byteArray);
jsonParser.nextToken();
return parseList(jsonParser);
}
/**
* Parse a list of objects from a char array. Note: parsing from an InputStream should be preferred over parsing from a char array if possible.
*
* @param charArray The char array, most likely from your networking library.
*/
public List parseList(char[] charArray) throws IOException {
JsonParser jsonParser = LoganSquare.JSON_FACTORY.createParser(charArray);
jsonParser.nextToken();
return parseList(jsonParser);
}
/**
* Parse a list of objects from a String. Note: parsing from an InputStream should be preferred over parsing from a String if possible.
*
* @param jsonString The JSON string being parsed.
*/
public List parseList(String jsonString) throws IOException {
JsonParser jsonParser = LoganSquare.JSON_FACTORY.createParser(jsonString);
jsonParser.nextToken();
return parseList(jsonParser);
}
/**
* Parse a list of objects from a JsonParser.
*
* @param jsonParser The JsonParser, preconfigured to be at the START_ARRAY token.
*/
public List parseList(JsonParser jsonParser) throws IOException {
List list = new ArrayList<>();
if (jsonParser.getCurrentToken() == JsonToken.START_ARRAY) {
while (jsonParser.nextToken() != JsonToken.END_ARRAY) {
list.add(parse(jsonParser));
}
}
return list;
}
/**
* Parse a map of objects from an InputStream.
*
* @param is The inputStream, most likely from your networking library.
*/
public Map parseMap(InputStream is) throws IOException {
JsonParser jsonParser = LoganSquare.JSON_FACTORY.createParser(is);
jsonParser.nextToken();
return parseMap(jsonParser);
}
/**
* Parse a map of objects from a byte array. Note: parsing from an InputStream should be preferred over parsing from a byte array if possible.
*
* @param byteArray The byte array string being parsed.
*/
public Map parseMap(byte[] byteArray) throws IOException {
JsonParser jsonParser = LoganSquare.JSON_FACTORY.createParser(byteArray);
jsonParser.nextToken();
return parseMap(jsonParser);
}
/**
* Parse a map of objects from a char array. Note: parsing from an InputStream should be preferred over parsing from a char array if possible.
*
* @param charArray The char array being parsed.
*/
public Map parseMap(char[] charArray) throws IOException {
JsonParser jsonParser = LoganSquare.JSON_FACTORY.createParser(charArray);
jsonParser.nextToken();
return parseMap(jsonParser);
}
/**
* Parse a map of objects from a String. Note: parsing from an InputStream should be preferred over parsing from a String if possible.
*
* @param jsonString The JSON string being parsed.
*/
public Map parseMap(String jsonString) throws IOException {
JsonParser jsonParser = LoganSquare.JSON_FACTORY.createParser(jsonString);
jsonParser.nextToken();
return parseMap(jsonParser);
}
/**
* Parse a map of objects from a JsonParser.
*
* @param jsonParser The JsonParser, preconfigured to be at the START_ARRAY token.
*/
public Map parseMap(JsonParser jsonParser) throws IOException {
HashMap map = new HashMap();
while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
String key = jsonParser.getText();
jsonParser.nextToken();
if (jsonParser.getCurrentToken() == JsonToken.VALUE_NULL) {
map.put(key, null);
} else{
map.put(key, parse(jsonParser));
}
}
return map;
}
/**
* Serialize an object to a JSON String.
*
* @param object The object to serialize.
*/
public String serialize(T object) throws IOException {
StringWriter sw = new StringWriter();
JsonGenerator jsonGenerator = LoganSquare.JSON_FACTORY.createGenerator(sw);
serialize(object, jsonGenerator, true);
jsonGenerator.close();
return sw.toString();
}
/**
* Serialize an object to an OutputStream.
*
* @param object The object to serialize.
* @param os The OutputStream being written to.
*/
public void serialize(T object, OutputStream os) throws IOException {
JsonGenerator jsonGenerator = LoganSquare.JSON_FACTORY.createGenerator(os);
serialize(object, jsonGenerator, true);
jsonGenerator.close();
}
/**
* Serialize a list of objects to a JSON String.
*
* @param list The list of objects to serialize.
*/
public String serialize(List list) throws IOException {
StringWriter sw = new StringWriter();
JsonGenerator jsonGenerator = LoganSquare.JSON_FACTORY.createGenerator(sw);
serialize(list, jsonGenerator);
jsonGenerator.close();
return sw.toString();
}
/**
* Serialize a list of objects to an OutputStream.
*
* @param list The list of objects to serialize.
* @param os The OutputStream to which the list should be serialized
*/
public void serialize(List list, OutputStream os) throws IOException {
JsonGenerator jsonGenerator = LoganSquare.JSON_FACTORY.createGenerator(os);
serialize(list, jsonGenerator);
jsonGenerator.close();
}
/**
* Serialize a list of objects to a JsonGenerator.
*
* @param list The list of objects to serialize.
* @param jsonGenerator The JsonGenerator to which the list should be serialized
*/
public void serialize(List list, JsonGenerator jsonGenerator) throws IOException {
jsonGenerator.writeStartArray();
for (T object : list) {
if (object != null) {
serialize(object, jsonGenerator, true);
} else {
jsonGenerator.writeNull();
}
}
jsonGenerator.writeEndArray();
}
/**
* Serialize a list of objects to a JSON String.
*
* @param map The map of objects to serialize.
*/
public String serialize(Map map) throws IOException {
StringWriter sw = new StringWriter();
JsonGenerator jsonGenerator = LoganSquare.JSON_FACTORY.createGenerator(sw);
serialize(map, jsonGenerator);
jsonGenerator.close();
return sw.toString();
}
/**
* Serialize a list of objects to an OutputStream.
*
* @param map The map of objects to serialize.
* @param os The OutputStream to which the list should be serialized
*/
public void serialize(Map map, OutputStream os) throws IOException {
JsonGenerator jsonGenerator = LoganSquare.JSON_FACTORY.createGenerator(os);
serialize(map, jsonGenerator);
jsonGenerator.close();
}
/**
* Serialize a list of objects to a JsonGenerator.
*
* @param map The map of objects to serialize.
* @param jsonGenerator The JsonGenerator to which the list should be serialized
*/
public void serialize(Map map, JsonGenerator jsonGenerator) throws IOException {
jsonGenerator.writeStartObject();
for (Map.Entry entry : map.entrySet()) {
jsonGenerator.writeFieldName(entry.getKey());
if (entry.getValue() == null) {
jsonGenerator.writeNull();
} else {
serialize(entry.getValue(), jsonGenerator, true);
}
}
jsonGenerator.writeEndObject();
}
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