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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.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.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;
-
- /**
- * 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 jsonValue
- * JSON value with encoded data
- * @param connection
- * reference to the current ApplicationConnection
- * @return decoded value (does not contain JSON types)
- */
- public 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, 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, JSONValue jsonMap,
- ApplicationConnection connection) {
- // Client -> server encodes empty map as an empty array because of
- // #8906. Do the same for server -> client to maintain symmetry.
- if (jsonMap instanceof JSONArray) {
- JSONArray array = (JSONArray) jsonMap;
- if (array.size() == 0) {
- return new HashMap<Object, Object>();
- }
- }
-
- Type keyType = type.getParameterTypes()[0];
- Type valueType = type.getParameterTypes()[1];
-
- if (keyType.getBaseTypeName().equals(String.class.getName())) {
- return decodeStringMap(valueType, jsonMap, connection);
- } else if (keyType.getBaseTypeName().equals(Connector.class.getName())) {
- return decodeConnectorMap(valueType, jsonMap, connection);
- } else {
- return decodeObjectMap(keyType, valueType, jsonMap, connection);
- }
- }
-
- private static Map<Object, Object> decodeObjectMap(Type keyType,
- Type valueType, JSONValue jsonValue,
- ApplicationConnection connection) {
- Map<Object, Object> map = new HashMap<Object, Object>();
-
- JSONArray mapArray = (JSONArray) jsonValue;
- JSONArray keys = (JSONArray) mapArray.get(0);
- JSONArray values = (JSONArray) mapArray.get(1);
-
- assert (keys.size() == values.size());
-
- for (int i = 0; i < keys.size(); i++) {
- Object decodedKey = decodeValue(keyType, keys.get(i), null,
- connection);
- Object decodedValue = decodeValue(valueType, values.get(i), null,
- connection);
-
- map.put(decodedKey, decodedValue);
- }
-
- return map;
- }
-
- private static Map<Object, Object> decodeConnectorMap(Type valueType,
- JSONValue jsonValue, ApplicationConnection connection) {
- Map<Object, Object> map = new HashMap<Object, Object>();
-
- JSONObject jsonMap = (JSONObject) jsonValue;
- ConnectorMap connectorMap = ConnectorMap.get(connection);
-
- for (String connectorId : jsonMap.keySet()) {
- Object value = decodeValue(valueType, jsonMap.get(connectorId),
- null, connection);
- map.put(connectorMap.getConnector(connectorId), value);
- }
-
- return map;
- }
-
- private static Map<Object, Object> decodeStringMap(Type valueType,
- JSONValue jsonValue, ApplicationConnection connection) {
- Map<Object, Object> map = new HashMap<Object, Object>();
-
- JSONObject jsonMap = (JSONObject) jsonValue;
-
- for (String key : jsonMap.keySet()) {
- Object value = decodeValue(valueType, jsonMap.get(key), null,
- connection);
- map.put(key, value);
- }
-
- 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
- JSONValue entryValue = jsonArray.get(i);
- tokens.add(decodeValue(childType, entryValue, null, connection));
- }
- }
- }
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