// 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.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.chromium.sdk.JsScope;

import org.chromium.sdk.JsVariable;

/**

 * A generic implementation of the JsScope interface.

 */

public class JsScopeImpl implements JsScope {

  private final CallFrameImpl callFrameImpl;

  private final ScopeMirror mirror;

  private List<JsVariable> properties = null;

  public JsScopeImpl(CallFrameImpl callFrameImpl, ScopeMirror mirror) {

    this.callFrameImpl = callFrameImpl;

    this.mirror = mirror;

  }

  public Type getType() {

    Type type = CODE_TO_TYPE.get(mirror.getType());

    if (type == null) {

      type = Type.UNKNOWN;

    }

    return type;

  }

  public synchronized List<? extends JsVariable> getVariables() {

    if (properties == null) {

      ValueLoader valueLoader = callFrameImpl.getInternalContext().getValueLoader();

      List<? extends PropertyReference> propertyRefs =

          valueLoader.loadScopeFields(mirror.getIndex(), callFrameImpl.getIdentifier());

      List<ValueMirror> propertyMirrors = valueLoader.getOrLoadValueFromRefs(propertyRefs);

      properties = new ArrayList<JsVariable>(propertyMirrors.size());

      for (int i = 0; i < propertyMirrors.size(); i++) {

        properties.add(new JsVariableImpl(callFrameImpl, propertyMirrors.get(i),

            propertyRefs.get(i).getName()));

      }

    }

    return properties;

  }

  private static final Map<Integer, Type> CODE_TO_TYPE;

  static {

    CODE_TO_TYPE = new HashMap<Integer, Type>();

    CODE_TO_TYPE.put(0, Type.GLOBAL);

    CODE_TO_TYPE.put(1, Type.LOCAL);

    CODE_TO_TYPE.put(2, Type.WITH);

    CODE_TO_TYPE.put(3, Type.CLOSURE);

    CODE_TO_TYPE.put(4, Type.CATCH);

  }

}