// 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

  }

}