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/**
* Copyright (c) 2011, 2014, Jonathan Giles, Johan Vos, Hendrik Ebbers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of DataFX, the website javafxdata.org, nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL DATAFX BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package io.datafx.io.converter;
import io.datafx.io.converter.JsonConverter.ObjectMapper;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Parameter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javax.json.Json;
import javax.json.JsonArray;
import javax.json.JsonNumber;
import javax.json.JsonObject;
import javax.json.JsonReader;
import javax.json.JsonString;
import javax.json.JsonStructure;
import javax.json.JsonValue;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlTransient;
/**
*
* An implementation of {@link io.datafx.io.Converter} that converts JSON
* data into Java Objects of type T.
*
* @param the type of the resulting Java objects
*/
public class JsonConverter extends InputStreamConverter {
private JsonStructure rootNode;
private final String tag;
private final Class clazz;
private final ObjectMapper objectMapper;
private Iterator iterator;
private static final Logger LOGGER = Logger.getLogger(JsonConverter.class.getName());
/**
* Create a JsonConverter that will generate instances of the specified
* class.
*
* @param clazz the entities returned by the {@link #get()} call will be of
* class clazz
*/
public JsonConverter(Class clazz) {
this(null, clazz);
}
/**
* Create a JsonConverter that will generate instances of the specified
* class. Using this constructor, it is assumed that the entities are
* contained within a Json structure in a Node with the name specified by
* the value of the tag parameter.
*
* @param clazz the entities returned by the {@link #get()} call will be of
* class clazz
* @param tag the name of the json node(s) holding the data entity(ies).
*/
public JsonConverter(String tag, Class clazz) {
this.tag = tag;
this.clazz = clazz;
this.objectMapper = new ObjectMapper<>(clazz);
LOGGER.fine("created Json Converter");
}
@Override
public void initialize(InputStream input) {
LOGGER.fine("Initialize jsonConverter");
JsonReader reader = Json.createReader(input);
rootNode = reader.read();
LOGGER.fine("RootNode valuetype = "+rootNode.getValueType());
if (rootNode.getValueType() == JsonValue.ValueType.ARRAY) {
JsonArray rootNodeArray = (JsonArray) rootNode;
iterator = rootNodeArray.iterator();
} else if (tag != null && rootNode.getValueType() == JsonValue.ValueType.OBJECT) {
JsonObject rootNodeObject = (JsonObject) rootNode;
if (rootNodeObject.containsKey(tag)) {
JsonValue tagValue = rootNodeObject.get(tag);
if (tagValue.getValueType() == JsonValue.ValueType.ARRAY) {
JsonArray rootNodeArray = (JsonArray) tagValue;
iterator = rootNodeArray.iterator();
}
}
}
LOGGER.fine("Inialized jsonconverter, rootNode = "+rootNode+" and iterator = "+iterator+" and tag = "+tag);
}
@Override
public T get() {
T item;
LOGGER.log(Level.FINER, "getting json data, tag = {0}", tag);
// if no tag is specified, we assume it is a single item
if (tag == null) {
item = objectMapper.readValue(rootNode);
} else {
JsonValue next = iterator.next();
item = objectMapper.readValue(next);
}
LOGGER.log(Level.FINER, "did read Object {0}", item);
return item;
}
@Override
public boolean next() {
LOGGER.finer("Does json has next for tag "+tag);
if (tag == null) {
return false;
} else {
return iterator.hasNext();
}
}
static class ObjectMapper {
private final Class clazz;
private final Map settersMappedByPropertyName = new HashMap<>();
private final static Map objectMappers = new HashMap<>();
public ObjectMapper(Class clazz) {
this.clazz = clazz;
objectMappers.put(clazz, this);
resolveProperties();
}
private synchronized void resolveProperties() {
Method[] methods = clazz.getMethods();
// sort methods array by method name, so getter methods are processed before setter methods
Arrays.sort(methods, new Comparator() {
@Override
public int compare(Method o1, Method o2) {
return o1.getName().compareTo(o2.getName());
}
});
Map getters = new HashMap<>();
for (Method method : methods) {
String methodName = method.getName();
if (Modifier.isPublic(method.getModifiers()) &&
method.getParameterTypes().length == 0 &&
!method.isAnnotationPresent(XmlTransient.class) &&
((methodName.matches("^get[A-Z].*") && !method.getReturnType().equals(void.class)) ||
(methodName.matches("^is[A-Z].*") && method.getReturnType().equals(boolean.class)))) {
String bareMethodName = methodName.startsWith("get") ? methodName.substring(3) : methodName.substring(2);
getters.put(bareMethodName, method);
}
if (Modifier.isPublic(method.getModifiers()) &&
method.getParameterTypes().length == 1 &&
method.getReturnType().equals(void.class) &&
!method.isAnnotationPresent(XmlTransient.class) &&
methodName.matches("^set[A-Z].*")) {
String bareMethodName = methodName.substring(3);
Method getter = getters.get(bareMethodName);
if (getter != null) {
String finalName = bareMethodName.substring(0, 1).toLowerCase();
if (bareMethodName.length() > 1) {
finalName += bareMethodName.substring(1);
}
if (getter.isAnnotationPresent(XmlElement.class) || method.isAnnotationPresent(XmlElement.class)) {
XmlElement xmlElement = getter.isAnnotationPresent(XmlElement.class) ? getter.getAnnotation(XmlElement.class) : method.getAnnotation(XmlElement.class);
String annotatedName = xmlElement.name();
if (annotatedName != null && !annotatedName.isEmpty()) {
finalName = annotatedName;
}
}
settersMappedByPropertyName.put(finalName, method);
}
}
}
}
private T readValue(JsonValue value) {
try {
T t = clazz.newInstance();
if (value.getValueType() == JsonValue.ValueType.OBJECT) {
JsonObject object = (JsonObject) value;
for (String property : settersMappedByPropertyName.keySet()) {
LOGGER.fine("Check if the received object has a property named "+property);
if (object.containsKey(property)) {
LOGGER.fine("Yes, the received object has a property named "+property);
Method setter = settersMappedByPropertyName.get(property);
JsonValue propertyValue = (JsonValue) object.get(property);
Object[] args = new Object[1];
switch (propertyValue.getValueType()) {
case NULL:
args[0] = null;
break;
case FALSE:
args[0] = Boolean.FALSE;
break;
case TRUE:
args[0] = Boolean.TRUE;
break;
case STRING:
JsonString stringProperty = (JsonString) propertyValue;
args[0] = stringProperty.getString();
break;
case NUMBER:
JsonNumber numberProperty = (JsonNumber) propertyValue;
Class setterParameterType = setter.getParameterTypes()[0];
if (!setterParameterType.isArray()) {
String setterParameterTypeName = setterParameterType.getName();
switch (setterParameterTypeName) {
case "byte":
case "java.lang.Byte":
case "int":
case "java.lang.Integer":
case "short":
case "java.lang.Short":
args[0] = numberProperty.intValue();
break;
case "long":
case "java.lang.Long":
args[0] = numberProperty.longValue();
break;
case "double":
case "java.lang.Double":
args[0] = numberProperty.doubleValue();
break;
case "float":
case "java.lang.Float":
args[0] = (float) numberProperty.doubleValue();
break;
case "java.lang.String":
case "javafx.beans.property.StringProperty":
args[0] = numberProperty.toString();
break;
}
}
break;
case ARRAY:
JsonArray arrayProperty = (JsonArray) propertyValue;
Class parameterType = setter.getParameterTypes()[0];
List values;
if (parameterType.isAssignableFrom(ObservableList.class)) {
values = FXCollections.observableArrayList();
} else {
values = new ArrayList();
}
for (int i = 0; i < arrayProperty.size(); i++) {
JsonValue arrayValue = arrayProperty.get(i);
switch (arrayValue.getValueType()) {
case NULL:
values.add(null);
break;
case FALSE:
values.add(Boolean.FALSE);
break;
case TRUE:
values.add(Boolean.TRUE);
break;
case STRING:
JsonString stringArrayValue = (JsonString) arrayValue;
values.add(stringArrayValue.getString());
break;
case NUMBER:
JsonNumber numberArrayValue = (JsonNumber) arrayValue;
if (numberArrayValue.isIntegral()) {
values.add(numberArrayValue.longValue());
} else {
values.add(numberArrayValue.doubleValue());
}
break;
case OBJECT:
System.out.println("ARRAYVAL = "+arrayValue);
System.out.println("expected type = "+setter.getParameterTypes()[0]);
Class parameterTypes = setter.getParameterTypes()[0];
parameterTypes.getAnnotations();
default:
// TODO: implement nested arrays and objects in arrays
throw new UnsupportedOperationException("Arrays or objects within arrays not yet supported.");
}
}
args[0] = values;
break;
case OBJECT:
Class[] p =setter.getParameterTypes();
// Parameter[] p = setter.getParameters();
if (p.length != 1) {
LOGGER.info("We expect a single parameter when setting an object but we got " + p.length);
} else {
Class subClazz = p[0];
ObjectMapper mapper;
if (objectMappers.containsKey(subClazz)) {
mapper = objectMappers.get(subClazz);
} else {
mapper = new ObjectMapper(subClazz);
}
args[0] = mapper.readValue(propertyValue);
}
}
try {
setter.invoke(t, args);
} catch (IllegalArgumentException | InvocationTargetException ex) {
Logger.getLogger(JsonConverter.class.getName()).log(Level.SEVERE, "Failed to call setter " + setter + " with value " + propertyValue, ex);
}
}
}
}
return t;
} catch (InstantiationException | IllegalAccessException ex) {
Logger.getLogger(JsonConverter.class.getName()).log(Level.SEVERE, "Could not instantiate object of type " + clazz, ex);
}
return null;
}
}
}
