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/*
 * Copyright 2014 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.HasName;
import com.google.gwt.dev.jjs.ast.JClassType;
import com.google.gwt.dev.jjs.ast.JDeclaredType;
import com.google.gwt.dev.jjs.ast.JField;
import com.google.gwt.dev.jjs.ast.JMethod;
import com.google.gwt.dev.js.ast.JsName;
import com.google.gwt.dev.js.ast.JsStatement;
import com.google.gwt.thirdparty.guava.common.collect.Maps;

import java.util.List;
import java.util.Map;

/**
 * The default implementation of a JavaToJavaScriptMap.
 */
public class JavaToJavaScriptMapImpl implements JavaToJavaScriptMap {

  private final Map names;
  private final Map fieldForName;
  private final Map methodForName;
  private final Map typeForConstructorName;

  private final Map typeForStatement;
  private final Map methodForVTableInit;

  public JavaToJavaScriptMapImpl(List types,
      Map names,
      Map typeForStatement,
      Map vtableInitForMethod) {

    // Generate reverse indexes for names.
    Map nameToMethodMap = Maps.newHashMap();
    Map nameToFieldMap = Maps.newHashMap();
    Map constructorNameToTypeMap = Maps.newHashMap();
    for (JDeclaredType type : types) {
      JsName typeName = names.get(type);
      if (type instanceof JClassType && typeName != null) {
        constructorNameToTypeMap.put(typeName, (JClassType) type);
      }
      for (JField field : type.getFields()) {
        if (field.isStatic()) {
          JsName fieldName = names.get(field);
          if (fieldName != null) {
            nameToFieldMap.put(fieldName, field);
          }
        }
      }
      for (JMethod method : type.getMethods()) {
        JsName methodName = names.get(method);
        if (methodName != null) {
          nameToMethodMap.put(methodName, method);
        }
      }
    }

    this.names = names;
    this.fieldForName = nameToFieldMap;
    this.methodForName = nameToMethodMap;
    this.typeForConstructorName = constructorNameToTypeMap;

    this.typeForStatement = typeForStatement;
    this.methodForVTableInit = vtableInitForMethod;
  }

  @Override
  public JsName nameForField(JField field) {
    return names.get(field);
  }

  @Override
  public JsName nameForMethod(JMethod method) {
    return names.get(method);
  }

  @Override
  public JsName nameForType(JClassType type) {
    return names.get(type);
  }

  @Override
  public JField nameToField(JsName name) {
    return fieldForName.get(name);
  }

  @Override
  public JMethod nameToMethod(JsName name) {
    return methodForName.get(name);
  }

  @Override
  public JClassType nameToType(JsName name) {
    return typeForConstructorName.get(name);
  }

  @Override
  public JClassType typeForStatement(JsStatement stat) {
    return typeForStatement.get(stat);
  }

  @Override
  public JMethod vtableInitToMethod(JsStatement stat) {
    return methodForVTableInit.get(stat);
  }
}