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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.terminal.gwt.client.communication;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import com.google.gwt.json.client.JSONArray;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONParser;
import com.google.gwt.json.client.JSONString;
import com.google.gwt.json.client.JSONValue;
import com.vaadin.terminal.gwt.client.ApplicationConnection;
import com.vaadin.terminal.gwt.client.Connector;
import com.vaadin.terminal.gwt.client.ConnectorMap;
import com.vaadin.terminal.gwt.client.ServerConnector;
/**
* Client side decoder for decodeing shared state and other values from JSON
* received from the server.
*
* Currently, basic data types as well as Map, String[] and Object[] are
* supported, where maps and Object[] can contain other supported data types.
*
* TODO extensible type support
*
* @since 7.0
*/
public class JsonDecoder {
/**
* Decode a JSON array with two elements (type and value) into a client-side
* type, recursively if necessary.
*
* @param jsonArray
* JSON array with two elements
* @param idMapper
* mapper between connector ID and {@link ServerConnector}
* objects
* @param connection
* reference to the current ApplicationConnection
* @return decoded value (does not contain JSON types)
*/
public static Object decodeValue(Type type, JSONArray jsonArray,
Object target, ApplicationConnection connection) {
return decodeValue(type, jsonArray.get(1), target, connection);
}
private static Object decodeValue(Type type, JSONValue jsonValue,
Object target, ApplicationConnection connection) {
// Null is null, regardless of type
if (jsonValue.isNull() != null) {
return null;
}
String baseTypeName = type.getBaseTypeName();
if (baseTypeName.endsWith("[]")) {
return decodeArray(type, (JSONArray) jsonValue, connection);
} else if (Map.class.getName().equals(baseTypeName)
|| HashMap.class.getName().equals(baseTypeName)) {
return decodeMap(type, (JSONObject) jsonValue, connection);
} else if (List.class.getName().equals(baseTypeName)
|| ArrayList.class.getName().equals(baseTypeName)) {
return decodeList(type, (JSONArray) jsonValue, connection);
} else if (Set.class.getName().equals(baseTypeName)) {
return decodeSet(type, (JSONArray) jsonValue, connection);
} else if (String.class.getName().equals(baseTypeName)) {
return ((JSONString) jsonValue).stringValue();
} else if (Integer.class.getName().equals(baseTypeName)) {
return Integer.valueOf(String.valueOf(jsonValue));
} else if (Long.class.getName().equals(baseTypeName)) {
// TODO handle properly
return Long.valueOf(String.valueOf(jsonValue));
} else if (Float.class.getName().equals(baseTypeName)) {
// TODO handle properly
return Float.valueOf(String.valueOf(jsonValue));
} else if (Double.class.getName().equals(baseTypeName)) {
// TODO handle properly
return Double.valueOf(String.valueOf(jsonValue));
} else if (Boolean.class.getName().equals(baseTypeName)) {
// TODO handle properly
return Boolean.valueOf(String.valueOf(jsonValue));
} else if (Connector.class.getName().equals(baseTypeName)) {
return ConnectorMap.get(connection).getConnector(
((JSONString) jsonValue).stringValue());
} else {
return decodeObject(type, jsonValue, target, connection);
}
}
private static Object decodeObject(Type type, JSONValue jsonValue,
Object target, ApplicationConnection connection) {
JSONSerializer<Object> serializer = connection.getSerializerMap()
.getSerializer(type.getBaseTypeName());
// TODO handle case with no serializer found
// Currently getSerializer throws exception if not found
if (target != null && serializer instanceof DiffJSONSerializer<?>) {
DiffJSONSerializer<Object> diffSerializer = (DiffJSONSerializer<Object>) serializer;
diffSerializer.update(target, type, jsonValue, connection);
return target;
} else {
Object object = serializer.deserialize(type, jsonValue, connection);
return object;
}
}
private static Map<Object, Object> decodeMap(Type type, JSONObject jsonMap,
ApplicationConnection connection) {
HashMap<Object, Object> map = new HashMap<Object, Object>();
Iterator<String> it = jsonMap.keySet().iterator();
while (it.hasNext()) {
String key = it.next();
JSONArray encodedKey = (JSONArray) JSONParser.parseStrict(key);
JSONArray encodedValue = (JSONArray) jsonMap.get(key);
Object decodedKey = decodeValue(type.getParameterTypes()[0],
encodedKey, null, connection);
Object decodedValue = decodeValue(type.getParameterTypes()[1],
encodedValue, null, connection);
map.put(decodedKey, decodedValue);
}
return map;
}
private static Object[] decodeArray(Type type, JSONArray jsonArray,
ApplicationConnection connection) {
String arrayTypeName = type.getBaseTypeName();
String chldTypeName = arrayTypeName.substring(0,
arrayTypeName.length() - 2);
List<Object> list = decodeList(new Type(chldTypeName, null), jsonArray,
connection);
return list.toArray(new Object[list.size()]);
}
private static List<Object> decodeList(Type type, JSONArray jsonArray,
ApplicationConnection connection) {
List<Object> tokens = new ArrayList<Object>();
decodeIntoCollection(type.getParameterTypes()[0], jsonArray,
connection, tokens);
return tokens;
}
private static Set<Object> decodeSet(Type type, JSONArray jsonArray,
ApplicationConnection connection) {
Set<Object> tokens = new HashSet<Object>();
decodeIntoCollection(type.getParameterTypes()[0], jsonArray,
connection, tokens);
return tokens;
}
private static void decodeIntoCollection(Type childType,
JSONArray jsonArray, ApplicationConnection connection,
Collection<Object> tokens) {
for (int i = 0; i < jsonArray.size(); ++i) {
// each entry always has two elements: type and value
JSONArray entryArray = (JSONArray) jsonArray.get(i);
tokens.add(decodeValue(childType, entryArray, null, connection));
}
}
}
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