// 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.Arrays;

import java.util.Collections;

import java.util.List;

import org.chromium.sdk.internal.protocol.data.FunctionValueHandle;

import org.chromium.sdk.internal.protocol.data.ObjectValueHandle;

import org.chromium.sdk.internal.tools.v8.V8ProtocolUtil;

/**

 * This class is intended to hold properties either already parsed or to be parsed on demand.

 */

public abstract class SubpropertiesMirror {

  public abstract List<? extends PropertyReference> getProperties();

  public abstract List<? extends PropertyReference> getInternalProperties();

  public abstract Object getAdditionalProperties();

  public static class ObjectValueBased extends JsonBased<ObjectValueHandle> {

    private final ObjectValueHandle objectValueHandle;

    public ObjectValueBased(ObjectValueHandle valueHandle,

        AdditionalPropertyFactory<ObjectValueHandle> additionalPropertyFactory) {

      super(additionalPropertyFactory);

      this.objectValueHandle = valueHandle;

    }

    @Override

    protected ObjectValueHandle getObjectForFactory() {

      return objectValueHandle;

    }

    @Override

    protected ObjectValueHandle getObjectValue() {

      return objectValueHandle;

    }

  }

  public static class FunctionValueBased extends JsonBased<FunctionValueHandle> {

    private final FunctionValueHandle functionValueHandle;

    public FunctionValueBased(FunctionValueHandle functionValueHandle,

        AdditionalPropertyFactory<FunctionValueHandle> additionalPropertyFactory) {

      super(additionalPropertyFactory);

      this.functionValueHandle = functionValueHandle;

    }

    @Override

    protected FunctionValueHandle getObjectForFactory() {

      return functionValueHandle;

    }

    @Override

    protected ObjectValueHandle getObjectValue() {

      return functionValueHandle.getSuper();

    }

  }

  /**

   * Keeps properties in for of JSON and parses JSON on demand.

   */

  public static abstract class JsonBased<T> extends SubpropertiesMirror {

    private final AdditionalPropertyFactory<T> additionalPropertyFactory;

    private List<? extends PropertyReference> properties = null;

    private List<? extends PropertyReference> internalProperties = null;

    private Object additionalProperties = null;

    public JsonBased(AdditionalPropertyFactory<T> additionalPropertyFactory) {

      if (additionalPropertyFactory == null) {

        additionalPropertyFactory = NO_OP_FACTORY;

      }

      this.additionalPropertyFactory = additionalPropertyFactory;

    }

    @Override

    public synchronized List<? extends PropertyReference> getProperties() {

      if (properties == null) {

        properties = V8ProtocolUtil.extractObjectProperties(getObjectValue());

      }

      return properties;

    }

    @Override

    public synchronized List<? extends PropertyReference> getInternalProperties() {

      if (internalProperties == null) {

        internalProperties = V8ProtocolUtil.extractObjectInternalProperties(getObjectValue());

      }

      return internalProperties;

    }

    protected abstract ObjectValueHandle getObjectValue();

    @Override

    public Object getAdditionalProperties() {

      if (additionalProperties == null) {

        additionalProperties =

            additionalPropertyFactory.createAdditionalProperties(getObjectForFactory());

      }

      return additionalProperties;

    }

    protected abstract T getObjectForFactory();

    public interface AdditionalPropertyFactory<T> {

      Object createAdditionalProperties(T jsonWithProperties);

    }

    private static AdditionalPropertyFactory NO_OP_FACTORY = new AdditionalPropertyFactory<Void>() {

      public Object createAdditionalProperties(Void jsonWithProperties) {

        return EMPTY_OBJECT;

      }

    };

  }

  static class ListBased extends SubpropertiesMirror {

    private final List<PropertyReference> list;

    ListBased(PropertyReference ... refs) {

      this.list = Collections.unmodifiableList(Arrays.asList(refs));

    }

    @Override

    public List<? extends PropertyReference> getProperties() {

      return list;

    }

    @Override

    public List<? extends PropertyReference> getInternalProperties() {

      return Collections.emptyList();

    }

    @Override

    public Object getAdditionalProperties() {

      return EMPTY_OBJECT;

    }

  }

  static final SubpropertiesMirror EMPTY = new SubpropertiesMirror() {

    @Override

    public List<? extends PropertyReference> getProperties() {

      return Collections.emptyList();

    }

    @Override

    public List<? extends PropertyReference> getInternalProperties() {

      return Collections.emptyList();

    }

    @Override

    public Object getAdditionalProperties() {

      return EMPTY_OBJECT;

    }

  };

  private static final Object EMPTY_OBJECT = new Object();

}