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/*
* Copyright (c) Balajee TM 2016.
* All rights reserved.
* License - @see
*/
/*
* Created on 25 Aug, 2016 by balajeetm
* http://www.balajeetm.com
*/
package com.balajeetm.mystique.util.jackson.convertor;
import com.balajeetm.mystique.util.jackson.JacksonFactory;
import com.balajeetm.mystique.util.json.convertor.JsonConvertor;
import com.balajeetm.mystique.util.json.error.ConvertorException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.TypeFactory;
import java.io.InputStream;
import java.util.Collection;
import java.util.List;
import java.util.Objects;
import lombok.extern.slf4j.Slf4j;
/**
* The Class JacksonConvertor.
*
* @author balajeetm
*/
@Slf4j
public class JacksonConvertor implements JsonConvertor {
/** Instantiates a new json jackson convertor. */
private JacksonConvertor() {}
// Efficient Thread safe Lazy Initialization
// works only if the singleton constructor is non parameterized
/**
* Gets the single instance of JsonJacksonConvertor.
*
* @return single instance of JsonJacksonConvertor
*/
public static JsonConvertor getInstance() {
return Creator.INSTANCE;
}
/*
* (non-Javadoc)
*
* @see
* com.balajeetm.mystique.util.json.convertor.JsonConvertor#deserialize(java
* .lang.String, java.lang.Class)
*/
public T deserialize(String jsonString, Class pojoType) throws ConvertorException {
T value = null;
try {
value = null != jsonString ? getObjectMapper().readValue(jsonString, pojoType) : value;
} catch (Exception e) {
log.error(
String.format(
"Error during deserialisation of json string %s to class %s.", jsonString, pojoType));
throw getConvertorException(e);
}
return value;
}
/*
* (non-Javadoc)
*
* @see
* com.balajeetm.mystique.util.json.convertor.JsonConvertor#deserialize(java
* .lang.Object, java.lang.Class)
*/
public T deserialize(Object object, Class pojoType) throws ConvertorException {
T value = null;
try {
value = null != object ? getObjectMapper().convertValue(object, pojoType) : value;
} catch (Exception e) {
log.error(
String.format(
"Error during deserialisation of object %s to class %s.", object, pojoType));
throw getConvertorException(e);
}
return value;
}
/*
* (non-Javadoc)
*
* @see
* com.balajeetm.mystique.util.json.convertor.JsonConvertor#deserialize(java
* .io.InputStream, java.lang.Class)
*/
public T deserialize(InputStream inputStream, Class pojoType) throws ConvertorException {
T value = null;
try {
value = null != inputStream ? getObjectMapper().readValue(inputStream, pojoType) : value;
} catch (Exception e) {
log.error(
String.format(
"Error during deserialisation of json input stream %s to class %s.",
inputStream, pojoType));
throw getConvertorException(e);
}
return value;
}
/**
* Gets the convertor exception.
*
* @param e the e
* @return the convertor exception
*/
private ConvertorException getConvertorException(Exception e) {
log.debug("Error occured during conversion", e);
return new ConvertorException(e);
}
/*
* (non-Javadoc)
*
* @see
* com.balajeetm.mystique.util.json.convertor.JsonConvertor#serialize(java.
* lang.Object)
*/
public String serialize(Object pojo) throws ConvertorException {
try {
return Objects.isNull(pojo) ? null : getObjectMapper().writeValueAsString(pojo);
} catch (Exception e) {
log.error(String.format("Error during serialisation of object %s.", pojo));
throw getConvertorException(e);
}
}
/*
* (non-Javadoc)
*
* @see
* com.balajeetm.mystique.util.json.convertor.JsonConvertor#deserializeGroup
* (java.io.InputStream, java.lang.Class, java.lang.Class)
*/
@SuppressWarnings("unchecked")
public T deserializeGroup(InputStream inputStream, Class groupClass, Class pojoType)
throws ConvertorException {
T result = null;
if (Objects.nonNull(inputStream)) {
try {
JavaType javaType = getJavaType(groupClass, pojoType);
result = (T) getObjectMapper().readValue(inputStream, javaType);
} catch (Exception e) {
log.error(
String.format(
"Error during deserialisation of json input stream %s to %s<%s>.",
inputStream, groupClass.getSimpleName(), pojoType.getSimpleName()));
throw getConvertorException(e);
}
}
return result;
}
/*
* (non-Javadoc)
*
* @see
* com.balajeetm.mystique.util.json.convertor.JsonConvertor#deserializeList(
* java.io.InputStream, java.lang.Class)
*/
@SuppressWarnings("unchecked")
public List deserializeList(InputStream inputStream, Class pojoType)
throws ConvertorException {
List result = null;
if (Objects.nonNull(inputStream)) {
JavaType javaType = getJavaType(List.class, pojoType);
try {
result = (List) getObjectMapper().readValue(inputStream, javaType);
} catch (Exception e) {
log.error(
String.format(
"Error during deserialisation of json inputstream %s to List<%s>.",
inputStream, pojoType.getSimpleName()));
throw getConvertorException(e);
}
}
return result;
}
/*
* (non-Javadoc)
*
* @see
* com.balajeetm.mystique.util.json.convertor.JsonConvertor#deserializeList(
* java.lang.Object, java.lang.Class)
*/
@SuppressWarnings("unchecked")
public List deserializeList(Object object, Class pojoType) throws ConvertorException {
List result = null;
if (Objects.nonNull(object)) {
JavaType javaType = getJavaType(List.class, pojoType);
try {
result = (List) getObjectMapper().convertValue(object, javaType);
} catch (Exception e) {
log.error(
String.format(
"Error during deserialisation of object %s to List<%s>.",
object, pojoType.getSimpleName()));
throw getConvertorException(e);
}
}
return result;
}
/*
* (non-Javadoc)
*
* @see
* com.balajeetm.mystique.util.json.convertor.JsonConvertor#deserializeGroup
* (java.lang.String, java.lang.Class, java.lang.Class)
*/
public T deserializeGroup(String jsonString, Class groupClass, Class pojoType)
throws ConvertorException {
return deserializeGroupOnJavaType(jsonString, groupClass, pojoType);
}
/**
* Deserialize group on java type.
*
* @param the generic type for the Java Group
* @param the generic type for the Java POJO
* @param jsonString the json string
* @param groupClass the group class
* @param pojoType the pojo type
* @return the deserialized java group of POJOs
*/
private T deserializeGroupOnJavaType(
String jsonString, Class groupClass, Class pojoType) {
T result = null;
if (Objects.nonNull(jsonString)) {
JavaType javaType = getJavaType(groupClass, pojoType);
try {
result = getObjectMapper().readValue(jsonString, javaType);
} catch (Exception e) {
log.error(
String.format(
"Error during deserialisation of json string %s to %s<%s>.",
jsonString, groupClass.getSimpleName(), pojoType.getSimpleName()));
throw getConvertorException(e);
}
}
return result;
}
/**
* Gets the java type.
*
* @param the generic type for Java Group
* @param the generic type for Java POJO
* @param groupClass the group class
* @param pojoType the pojo type
* @return the java type
*/
private JavaType getJavaType(Class groupClass, Class pojoType) {
JavaType javaType = null;
if (List.class.isAssignableFrom(groupClass)) {
javaType = TypeFactory.defaultInstance().constructCollectionType(List.class, pojoType);
} else if (Collection.class.isAssignableFrom(groupClass)) {
javaType = TypeFactory.defaultInstance().constructCollectionType(Collection.class, pojoType);
}
return javaType;
}
/*
* (non-Javadoc)
*
* @see
* com.balajeetm.mystique.util.json.convertor.JsonConvertor#deserializeList(
* java.lang.String, java.lang.Class)
*/
@SuppressWarnings("unchecked")
public List deserializeList(String jsonString, Class pojoType)
throws ConvertorException {
List result = null;
if (Objects.nonNull(jsonString)) {
JavaType javaType = getJavaType(List.class, pojoType);
try {
return (List) getObjectMapper().readValue(jsonString, javaType);
} catch (Exception e) {
log.error(
String.format(
"Error during deserialisation of json string %s to List<%s>.",
jsonString, pojoType.getSimpleName()));
throw getConvertorException(e);
}
}
return result;
}
/** The Class Creator. */
private static class Creator {
/** The instance. */
private static JsonConvertor INSTANCE = new JacksonConvertor();
}
private ObjectMapper getObjectMapper() {
return JacksonFactory.getInstance().getObjectMapper();
}
}