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- /*
- @VaadinApache2LicenseForJavaFiles@
- */
-
- package com.vaadin.terminal.gwt.server;
-
- import java.io.Serializable;
- import java.util.ArrayList;
- import java.util.HashMap;
- import java.util.Iterator;
- import java.util.List;
- import java.util.Map;
-
- import com.vaadin.external.json.JSONArray;
- import com.vaadin.external.json.JSONException;
- import com.vaadin.external.json.JSONObject;
- import com.vaadin.terminal.Paintable;
- import com.vaadin.terminal.gwt.client.communication.JsonEncoder;
- import com.vaadin.terminal.gwt.client.communication.SharedState;
-
- /**
- * Decoder for converting RPC parameters and other values from JSON in transfer
- * between the client and the server and vice versa.
- *
- * @since 7.0
- */
- public class JsonCodec implements Serializable {
-
- private static Map<Class<?>, String> typeToTransportType = new HashMap<Class<?>, String>();
-
- static {
- registerType(String.class, JsonEncoder.VTYPE_STRING);
- registerType(Paintable.class, JsonEncoder.VTYPE_PAINTABLE);
- registerType(Boolean.class, JsonEncoder.VTYPE_BOOLEAN);
- registerType(Integer.class, JsonEncoder.VTYPE_INTEGER);
- registerType(Float.class, JsonEncoder.VTYPE_FLOAT);
- registerType(Double.class, JsonEncoder.VTYPE_DOUBLE);
- registerType(Long.class, JsonEncoder.VTYPE_LONG);
- // transported as string representation
- registerType(Enum.class, JsonEncoder.VTYPE_STRING);
- registerType(String[].class, JsonEncoder.VTYPE_STRINGARRAY);
- registerType(Object[].class, JsonEncoder.VTYPE_ARRAY);
- registerType(Map.class, JsonEncoder.VTYPE_MAP);
- }
-
- private static void registerType(Class<?> type, String transportType) {
- typeToTransportType.put(type, transportType);
- }
-
- /**
- * Convert a JSON array with two elements (type and value) into a
- * server-side type, recursively if necessary.
- *
- * @param value
- * JSON array with two elements
- * @param idMapper
- * mapper between paintable ID and {@link Paintable} objects
- * @return converted value (does not contain JSON types)
- * @throws JSONException
- * if the conversion fails
- */
- public static Object convertVariableValue(JSONArray value,
- PaintableIdMapper idMapper) throws JSONException {
- return convertVariableValue(value.getString(0), value.get(1), idMapper);
- }
-
- private static Object convertVariableValue(String variableType,
- Object value, PaintableIdMapper idMapper) throws JSONException {
- Object val = null;
- // TODO type checks etc.
- if (JsonEncoder.VTYPE_ARRAY.equals(variableType)) {
- val = convertArray((JSONArray) value, idMapper);
- } else if (JsonEncoder.VTYPE_MAP.equals(variableType)) {
- val = convertMap((JSONObject) value, idMapper);
- } else if (JsonEncoder.VTYPE_STRINGARRAY.equals(variableType)) {
- val = convertStringArray((JSONArray) value);
- } else if (JsonEncoder.VTYPE_STRING.equals(variableType)) {
- val = value;
- } else if (JsonEncoder.VTYPE_INTEGER.equals(variableType)) {
- // TODO handle properly
- val = Integer.valueOf(String.valueOf(value));
- } else if (JsonEncoder.VTYPE_LONG.equals(variableType)) {
- // TODO handle properly
- val = Long.valueOf(String.valueOf(value));
- } else if (JsonEncoder.VTYPE_FLOAT.equals(variableType)) {
- // TODO handle properly
- val = Float.valueOf(String.valueOf(value));
- } else if (JsonEncoder.VTYPE_DOUBLE.equals(variableType)) {
- // TODO handle properly
- val = Double.valueOf(String.valueOf(value));
- } else if (JsonEncoder.VTYPE_BOOLEAN.equals(variableType)) {
- // TODO handle properly
- val = Boolean.valueOf(String.valueOf(value));
- } else if (JsonEncoder.VTYPE_PAINTABLE.equals(variableType)) {
- // TODO handle properly
- val = idMapper.getPaintable(String.valueOf(value));
- }
-
- return val;
- }
-
- private static Object convertMap(JSONObject jsonMap,
- PaintableIdMapper idMapper) throws JSONException {
- HashMap<String, Object> map = new HashMap<String, Object>();
- Iterator<String> it = jsonMap.keys();
- while (it.hasNext()) {
- String key = it.next();
- map.put(key,
- convertVariableValue(jsonMap.getJSONArray(key), idMapper));
- }
- return map;
- }
-
- private static String[] convertStringArray(JSONArray jsonArray)
- throws JSONException {
- int length = jsonArray.length();
- List<String> tokens = new ArrayList<String>(length);
- for (int i = 0; i < length; ++i) {
- tokens.add(jsonArray.getString(i));
- }
- return tokens.toArray(new String[tokens.size()]);
- }
-
- private static Object convertArray(JSONArray jsonArray,
- PaintableIdMapper idMapper) throws JSONException {
- List<Object> tokens = new ArrayList<Object>();
- for (int i = 0; i < jsonArray.length(); ++i) {
- // each entry always has two elements: type and value
- JSONArray entryArray = jsonArray.getJSONArray(i);
- tokens.add(convertVariableValue(entryArray, idMapper));
- }
- return tokens.toArray(new Object[tokens.size()]);
- }
-
- /**
- * Encode a value to a JSON representation for transport from the client to
- * the server.
- *
- * @param value
- * value to convert
- * @param idMapper
- * mapper between paintable ID and {@link Paintable} objects
- * @return JSON representation of the value
- * @throws JSONException
- * if encoding a value fails (e.g. NaN or infinite number)
- */
- public static JSONArray encode(Object value, PaintableIdMapper idMapper)
- throws JSONException {
- if (null == value) {
- // TODO as undefined type?
- return combineTypeAndValue(JsonEncoder.VTYPE_UNDEFINED,
- JSONObject.NULL);
- } else if (value instanceof SharedState) {
- // TODO implement by encoding the bean
- Map<String, Object> map = ((SharedState) value).getState();
- return combineTypeAndValue(JsonEncoder.VTYPE_SHAREDSTATE,
- encodeMapContents(map, idMapper));
- } else if (value instanceof String[]) {
- String[] array = (String[]) value;
- JSONArray jsonArray = new JSONArray();
- for (int i = 0; i < array.length; ++i) {
- jsonArray.put(array[i]);
- }
- return combineTypeAndValue(JsonEncoder.VTYPE_STRINGARRAY, jsonArray);
- } else if (value instanceof String) {
- return combineTypeAndValue(JsonEncoder.VTYPE_STRING, value);
- } else if (value instanceof Boolean) {
- return combineTypeAndValue(JsonEncoder.VTYPE_BOOLEAN, value);
- } else if (value instanceof Object[]) {
- Object[] array = (Object[]) value;
- JSONArray jsonArray = encodeArrayContents(array, idMapper);
- return combineTypeAndValue(JsonEncoder.VTYPE_ARRAY, jsonArray);
- } else if (value instanceof Map) {
- Map<String, Object> map = (Map<String, Object>) value;
- JSONObject jsonMap = encodeMapContents(map, idMapper);
- return combineTypeAndValue(JsonEncoder.VTYPE_MAP, jsonMap);
- } else if (value instanceof Paintable) {
- Paintable paintable = (Paintable) value;
- return combineTypeAndValue(JsonEncoder.VTYPE_PAINTABLE,
- idMapper.getPaintableId(paintable));
- } else {
- return combineTypeAndValue(getTransportType(value),
- String.valueOf(value));
- }
- }
-
- private static JSONArray encodeArrayContents(Object[] array,
- PaintableIdMapper idMapper) throws JSONException {
- JSONArray jsonArray = new JSONArray();
- for (int i = 0; i < array.length; ++i) {
- // TODO handle object graph loops?
- jsonArray.put(encode(array[i], idMapper));
- }
- return jsonArray;
- }
-
- private static JSONObject encodeMapContents(Map<String, Object> map,
- PaintableIdMapper idMapper) throws JSONException {
- JSONObject jsonMap = new JSONObject();
- for (String mapKey : map.keySet()) {
- // TODO handle object graph loops?
- Object mapValue = map.get(mapKey);
- jsonMap.put(mapKey, encode(mapValue, idMapper));
- }
- return jsonMap;
- }
-
- private static JSONArray combineTypeAndValue(String type, Object value) {
- JSONArray outerArray = new JSONArray();
- outerArray.put(type);
- outerArray.put(value);
- return outerArray;
- }
-
- private static String getTransportType(Object value) {
- if (null == value) {
- return JsonEncoder.VTYPE_UNDEFINED;
- }
- String transportType = typeToTransportType.get(value.getClass());
- if (null != transportType) {
- return transportType;
- }
- // TODO throw exception?
- return JsonEncoder.VTYPE_UNDEFINED;
- }
-
- }
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