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Easily integrate with Konduto (https://konduto.com), a fraud prevention service.
package com.konduto.sdk.models;
import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonObject;
import com.google.gson.reflect.TypeToken;
import com.konduto.sdk.adapters.KondutoPaymentAdapter;
import com.konduto.sdk.adapters.KondutoShoppingCartAdapter;
import com.konduto.sdk.adapters.KondutoTravelAdapter;
import com.konduto.sdk.annotations.Required;
import com.konduto.sdk.annotations.ValidateFormat;
import com.konduto.sdk.exceptions.KondutoInvalidEntityException;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.*;
/**
*
* This is the parent of all models.
*
*/
public abstract class KondutoModel {
protected KondutoModel(){ }
@Override
public abstract boolean equals(Object obj);
/* Transient and static attributes won't be included in serialization */
private static Type paymentsType = new TypeToken>(){}.getType();
private static Type shoppingCartType = new TypeToken>(){}.getType();
private static Type travelType = new TypeToken(){}.getType();
protected static Gson gson = new GsonBuilder()
.registerTypeAdapter(paymentsType, new KondutoPaymentAdapter())
.registerTypeAdapter(shoppingCartType, new KondutoShoppingCartAdapter())
.registerTypeAdapter(travelType, new KondutoTravelAdapter())
.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
.setDateFormat("yyyy-MM-dd")
.create();
protected transient List errors = new ArrayList<>();
/* Serialization methods */
/**
* Serializes a model instance to JSON.
* @return a {@link com.google.gson.JsonObject}
* @throws KondutoInvalidEntityException
*/
public JsonObject toJSON() throws KondutoInvalidEntityException{
if(!this.isValid()) { throw new KondutoInvalidEntityException(this); }
return (JsonObject) gson.toJsonTree(this);
}
/**
* Converts a {@link com.google.gson.JsonObject} to a model instance.
* @param json the serialized instance
* @param klass the instance class
* @return an instance of KondutoModel (e.g a KondutoAddress if klass is {@code KondutoAddress.class})
*/
public static KondutoModel fromJSON(JsonObject json, Class klass){
return (KondutoModel) gson.fromJson(json, klass);
}
/* Error printing methods */
/**
* @return {@link com.konduto.sdk.models.KondutoModel#errors errors} pretty printed.
*/
public String getErrors(){
StringBuilder errors = new StringBuilder();
for(String error : this.errors) {
errors.append("\n");
errors.append(error);
}
return this.getClass().getSimpleName() + errors.toString();
}
/**
* Adds a 'is required' message to {@link com.konduto.sdk.models.KondutoModel#errors errors}
*
* @param field the incorrect field
* @param value the incorrect field value
*/
void addIsRequiredError(Field field, Object value) {
if(value != null) {
this.errors.add("" +
"\t" +
field.getName() + " of class " +
value.getClass().getSimpleName() +
" is required but came " +
'\'' + value + '\'');
} else {
this.errors.add("\t" + field.getName() + " is required but came null");
}
}
/**
* Validates whether a string field's value matches a given regex.
* If it doesn't then add an error to the errors collection.
* @param field the field
* @param value the value
* @param format the format (a Java regex)
*/
private void addInvalidFormatError(Field field, Object value, String format) {
this.errors.add("" +
"\t" +
field.getName() + " value is " + value + " which format does not match " + '\'' + format + '\'');
}
/**
*
* @param errors a String containing a
* {@link com.konduto.sdk.models.KondutoModel#errors KondutoModel instance errors}
*/
void addIsInvalidError(String errors) {
this.errors.add(errors);
}
/**
* @return whether this KondutoModel instance is valid or not.
*/
/* Validation method */
public boolean isValid() {
errors.clear();
Object value;
for(Field f : this.getClass().getDeclaredFields()) {
if (!f.isSynthetic()) {
try {
f.setAccessible(true);
value = f.get(this);
// validates requirement
if(f.isAnnotationPresent(Required.class)){
if(value == null) {
addIsRequiredError(f, null);
} else {
Method isEmptyMethod = value.getClass().getMethod("isEmpty");
boolean isEmpty = (boolean) isEmptyMethod.invoke(value);
if(isEmpty) {
addIsRequiredError(f, value);
}
}
}
if(f.isAnnotationPresent(ValidateFormat.class)){
String format = f.getAnnotation(ValidateFormat.class).format();
if (value != null) {
boolean match = ((String) value).matches(format);
if(!match) {
addInvalidFormatError(f, value, format);
}
}
}
// if the field is a KondutoModel, check if it is valid
if (value instanceof KondutoModel) {
if(!((KondutoModel) value).isValid()) {
addIsInvalidError(((KondutoModel) value).getErrors());
}
}
} catch (NoSuchMethodException e) {
// no problem if method does not exist;
} catch (IllegalAccessException e) {
throw new RuntimeException("Illegal access to a required field should never happen.");
} catch (InvocationTargetException e) {
throw new RuntimeException();
}
}
}
return errors.isEmpty();
}
/**
* Enables Map-based construction in KondutoModel children.
*
* @param attributes a {@link HashMap} containing attributes. For a field 'totalAmount' with type Long, we should
* add the following entry to the map: 'totalAmount', 123L.
*/
public static KondutoModel fromMap(Map attributes, Class klass){
KondutoModel model;
try {
model = (KondutoModel) klass.newInstance();
} catch (InstantiationException e) {
e.printStackTrace();
throw new RuntimeException("could not instantiate an object of " + klass);
} catch (IllegalAccessException e) {
throw new RuntimeException("constructor is not accessible in " + klass);
}
for(Map.Entry attribute : attributes.entrySet()) {
String attributeName = attribute.getKey();
try {
Field field = klass.getDeclaredField(attributeName);
Object value = attribute.getValue();
if(!relatedClasses(field.getType(), value.getClass())){
throw new IllegalArgumentException(String.format(
"Illegal value for attribute %s. Expected a value of class %s, but got a value of class %s",
field.getName(),
field.getType(),
value.getClass()
));
}
field.setAccessible(true);
field.set(model, value);
} catch (NoSuchFieldException e) {
throw new IllegalArgumentException(String.format("Attribute %s was not found.", attributeName));
} catch (IllegalAccessException e) {
throw new RuntimeException("if field was found it should be accessible (via field.setAccessible(true))");
}
}
return model;
}
/**
* Classes are related iff class1 is the same as class2 or if one of them is a wrapper for the other one
* (e.g class1 is int.class and class2 is Integer.class)
* @param class1 a class
* @param class2 another class
* @return whether class1 and class2 are related
*/
private static boolean relatedClasses(Class class1, Class class2) {
if(class1.equals(class2)) return true;
if(isWrapped(class1, class2)) return true;
if(isWrapped(class2, class1)) return true;
return false;
}
/**
* Checks whether class1 is wrapped by class2.
* @param class1 supposedly wrapped class.
* @param class2 supposedly wrapper class.
* @return true if class1 is wrapped by class2 or false otherwise.
*/
private static boolean isWrapped(Class class1, Class class2) {
if(class1.equals(boolean.class) && class2.equals(Boolean.class)) return true;
if(class1.equals(byte.class) && class2.equals(Byte.class)) return true;
if(class1.equals(short.class) && class2.equals(Short.class)) return true;
if(class1.equals(char.class) && class2.equals(Character.class)) return true;
if(class1.equals(int.class) && class2.equals(Integer.class)) return true;
if(class1.equals(long.class) && class2.equals(Long.class)) return true;
if(class1.equals(float.class) && class2.equals(Float.class)) return true;
if(class1.equals(double.class) && class2.equals(Double.class)) return true;
return false;
}
/**
* Fluent constructor implementation
* @param attributeName the attribute name (e.g greeting)
* @param attributeValue the attribute value (e.g "Hello")
* @return a new instance
*
* @see Fluent interface article
*/
public KondutoModel with(String attributeName, Object attributeValue){
try {
Field field = this.getClass().getDeclaredField(attributeName);
field.setAccessible(true);
field.set(this, attributeValue);
} catch (NoSuchFieldException e) {
throw new RuntimeException("field " + attributeName + " was not found.");
} catch (IllegalAccessException e) {
throw new RuntimeException("field " + attributeName + "was found. Therefore it should be accessible.");
}
return this;
}
protected boolean nullSafeAreDatesEqual(Date one, Date two){
if ((one == null && two == null) ||
((one != null && two != null) && one.compareTo(two) == 0))
return true;
return false;
}
}