// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package org.chromium.sdk.internal;
import java.util.EnumMap;
import java.util.HashMap;
import java.util.Map;
import org.chromium.sdk.JsValue.Type;
/**
* A utility that facilitates retrieval of {@link Type}s according to the
* JSON values received.
*/
public class JsDataTypeUtil {
private static Map<String, Type> jsonTypeToEnum = new HashMap<String, Type>();
private static Map<Type, String> enumToJsonType = new EnumMap<Type, String>(Type.class);
/**
* Class name of an Array object (TYPE_ARRAY).
*/
public static final String CLASSNAME_ARRAY = "Array";
/**
* Class name of a Date object (TYPE_DATE).
*/
private static final String CLASSNAME_DATE = "Date";
static {
put("object", Type.TYPE_OBJECT);
put("number", Type.TYPE_NUMBER);
put("string", Type.TYPE_STRING);
put("function", Type.TYPE_FUNCTION);
put("boolean", Type.TYPE_BOOLEAN);
put("undefined", Type.TYPE_UNDEFINED);
put("null", Type.TYPE_NULL);
put("error", Type.TYPE_ERROR);
put("array", Type.TYPE_ARRAY);
put("date", Type.TYPE_DATE);
put("regexp", Type.TYPE_REGEXP);
}
/**
* Gets a JsDataType using a V8 JavaScript type and, optionally, a class name
* of the object. If {@code className} is {@code null}, only the 1:1 mapping
* shall be used.
*
* @param jsonType the JS type from a JSON response
* @param className a nullable class name of the object
* @return a JsDataType corresponding to {@code jsonType} and, possibly,
* modified according to {@code className}
*/
public static Type fromJsonTypeAndClassName(String jsonType, String className) {
if (jsonType == null) {
return null;
}
if (CLASSNAME_DATE.equals(className)) {
// hack to use the TYPE_DATE type even though its type in V8 is "object"
return Type.TYPE_DATE;
} else if (CLASSNAME_ARRAY.equals(className)) {
// hack to use the TYPE_ARRAY type even though its type in V8 is "object"
return Type.TYPE_ARRAY;
}
return jsonTypeToEnum.get(jsonType);
}
/**
* Converts {@code type} to its JSON representation used in V8.
*
* @param type to convert
* @return a string name of the type understandable by V8
*/
public static String getJsonString(Type type) {
return enumToJsonType.get(type);
}
private static void put(String jsonString, Type type) {
jsonTypeToEnum.put(jsonString, type);
enumToJsonType.put(type, jsonString);
}
private JsDataTypeUtil() {
// not instantiable
}
}