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/*
 * Copyright 2013 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.dev.jjs.impl;

import com.google.gwt.dev.jjs.ast.JPrimitiveType;
import com.google.gwt.dev.jjs.ast.JProgram;
import com.google.gwt.dev.jjs.ast.JReferenceType;
import com.google.gwt.dev.jjs.ast.JType;

/**
 * TypeCategory classifies Java types into different categories. 
 *
 * These are used in Cast checking and array implementation.
 */
public  enum TypeCategory {
    TYPE_JAVA_OBJECT, TYPE_JAVA_OBJECT_OR_JSO, TYPE_JSO, TYPE_JAVA_LANG_OBJECT,
    TYPE_JAVA_LANG_STRING, TYPE_JS_INTERFACE, TYPE_PRIMITIVE_LONG, TYPE_PRIMITIVE_NUMBER,
    TYPE_PRIMITIVE_BOOLEAN;

  /**
   * Determines the type category for a specific type.
   */
  public static TypeCategory typeCategoryForType(JType type, JProgram program) {
    if (type instanceof JPrimitiveType) {
      if (type == JPrimitiveType.BOOLEAN) {
        return TypeCategory.TYPE_PRIMITIVE_BOOLEAN;
      } else if (type == JPrimitiveType.LONG) {
        return TypeCategory.TYPE_PRIMITIVE_LONG;
      } else {
        return TypeCategory.TYPE_PRIMITIVE_NUMBER;
      }
    }

    assert type instanceof JReferenceType;
    type = type.getUnderlyingType();
    if (type == program.getTypeJavaLangObject()) {
      return TypeCategory.TYPE_JAVA_LANG_OBJECT;
    } else if (type == program.getTypeJavaLangString()) {
      return TypeCategory.TYPE_JAVA_LANG_STRING;
    } else if (program.typeOracle.willCrossCastLikeJso(type)) {
      return TypeCategory.TYPE_JSO;
    } else if (program.typeOracle.isDualJsoInterface(type) ||
        program.typeOracle.hasLiveImplementors(type) &&
        program.typeOracle.isOrExtendsJsType(type, false) &&
        !program.typeOracle.isOrExtendsJsType(type, true)) {
      return TypeCategory.TYPE_JAVA_OBJECT_OR_JSO;
    } else if (program.typeOracle.isOrExtendsJsType(type, true)) {
      return TypeCategory.TYPE_JS_INTERFACE;
    }
    return TypeCategory.TYPE_JAVA_OBJECT;
  }
}