#region License // Copyright (c) 2007 James Newton-King // // Permission is hereby granted, free of charge, to any person // obtaining a copy of this software and associated documentation // files (the "Software"), to deal in the Software without // restriction, including without limitation the rights to use, // copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following // conditions: // // The above copyright notice and this permission notice shall be // included in all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES // OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR // OTHER DEALINGS IN THE SOFTWARE. #endregion using System; using System.Collections.Generic; #if HAVE_INOTIFY_COLLECTION_CHANGED using System.Collections.ObjectModel; using System.Collections.Specialized; #endif using System.ComponentModel; #if HAVE_DYNAMIC using System.Dynamic; using System.Linq.Expressions; #endif using System.IO; using LC.Newtonsoft.Json.Utilities; using System.Globalization; using System.Runtime.CompilerServices; using System.Diagnostics.CodeAnalysis; #if !HAVE_LINQ using LC.Newtonsoft.Json.Utilities.LinqBridge; #else using System.Linq; #endif namespace LC.Newtonsoft.Json.Linq { ///

/// Represents a JSON object. ///

/// ///

///


    public partial class JObject : JContainer, IDictionary, INotifyPropertyChanged
#if HAVE_COMPONENT_MODEL
        , ICustomTypeDescriptor
#endif
#if HAVE_INOTIFY_PROPERTY_CHANGING
        , INotifyPropertyChanging
#endif
    {
        private readonly JPropertyKeyedCollection _properties = new JPropertyKeyedCollection();

        /// 
        /// Gets the container's children tokens.
        /// 
        /// The container's children tokens.
        protected override IList ChildrenTokens => _properties;

        /// 
        /// Occurs when a property value changes.
        /// 
        public event PropertyChangedEventHandler? PropertyChanged;

#if HAVE_INOTIFY_PROPERTY_CHANGING
        /// 
        /// Occurs when a property value is changing.
        /// 
        public event PropertyChangingEventHandler? PropertyChanging;
#endif

        /// 
        /// Initializes a new instance of the  class.
        /// 
        public JObject()
        {
        }

        /// 
        /// Initializes a new instance of the  class from another  object.
        /// 
        /// A  object to copy from.
        public JObject(JObject other)
            : base(other)
        {
        }

        /// 
        /// Initializes a new instance of the  class with the specified content.
        /// 
        /// The contents of the object.
        public JObject(params object[] content)
            : this((object)content)
        {
        }

        /// 
        /// Initializes a new instance of the  class with the specified content.
        /// 
        /// The contents of the object.
        public JObject(object content)
        {
            Add(content);
        }

        internal override bool DeepEquals(JToken node)
        {
            if (!(node is JObject t))
            {
                return false;
            }

            return _properties.Compare(t._properties);
        }

        internal override int IndexOfItem(JToken? item)
        {
            if (item == null)
            {
                return -1;
            }

            return _properties.IndexOfReference(item);
        }

        internal override bool InsertItem(int index, JToken? item, bool skipParentCheck)
        {
            // don't add comments to JObject, no name to reference comment by
            if (item != null && item.Type == JTokenType.Comment)
            {
                return false;
            }

            return base.InsertItem(index, item, skipParentCheck);
        }

        internal override void ValidateToken(JToken o, JToken? existing)
        {
            ValidationUtils.ArgumentNotNull(o, nameof(o));

            if (o.Type != JTokenType.Property)
            {
                throw new ArgumentException("Can not add {0} to {1}.".FormatWith(CultureInfo.InvariantCulture, o.GetType(), GetType()));
            }

            JProperty newProperty = (JProperty)o;

            if (existing != null)
            {
                JProperty existingProperty = (JProperty)existing;

                if (newProperty.Name == existingProperty.Name)
                {
                    return;
                }
            }

            if (_properties.TryGetValue(newProperty.Name, out existing))
            {
                throw new ArgumentException("Can not add property {0} to {1}. Property with the same name already exists on object.".FormatWith(CultureInfo.InvariantCulture, newProperty.Name, GetType()));
            }
        }

        internal override void MergeItem(object content, JsonMergeSettings? settings)
        {
            if (!(content is JObject o))
            {
                return;
            }

            foreach (KeyValuePair contentItem in o)
            {
                JProperty? existingProperty = Property(contentItem.Key, settings?.PropertyNameComparison ?? StringComparison.Ordinal);

                if (existingProperty == null)
                {
                    Add(contentItem.Key, contentItem.Value);
                }
                else if (contentItem.Value != null)
                {
                    if (!(existingProperty.Value is JContainer existingContainer) || existingContainer.Type != contentItem.Value.Type)
                    {
                        if (!IsNull(contentItem.Value) || settings?.MergeNullValueHandling == MergeNullValueHandling.Merge)
                        {
                            existingProperty.Value = contentItem.Value;
                        }
                    }
                    else
                    {
                        existingContainer.Merge(contentItem.Value, settings);
                    }
                }
            }
        }

        private static bool IsNull(JToken token)
        {
            if (token.Type == JTokenType.Null)
            {
                return true;
            }

            if (token is JValue v && v.Value == null)
            {
                return true;
            }

            return false;
        }

        internal void InternalPropertyChanged(JProperty childProperty)
        {
            OnPropertyChanged(childProperty.Name);
#if HAVE_COMPONENT_MODEL
            if (_listChanged != null)
            {
                OnListChanged(new ListChangedEventArgs(ListChangedType.ItemChanged, IndexOfItem(childProperty)));
            }
#endif
#if HAVE_INOTIFY_COLLECTION_CHANGED
            if (_collectionChanged != null)
            {
                OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Replace, childProperty, childProperty, IndexOfItem(childProperty)));
            }
#endif
        }

        internal void InternalPropertyChanging(JProperty childProperty)
        {
#if HAVE_INOTIFY_PROPERTY_CHANGING
            OnPropertyChanging(childProperty.Name);
#endif
        }

        internal override JToken CloneToken()
        {
            return new JObject(this);
        }

        /// 
        /// Gets the node type for this .
        /// 
        /// The type.
        public override JTokenType Type => JTokenType.Object;

        /// 
        /// Gets an  of  of this object's properties.
        /// 
        /// An  of  of this object's properties.
        public IEnumerable Properties()
        {
            return _properties.Cast();
        }

        /// 
        /// Gets a  with the specified name.
        /// 
        /// The property name.
        /// A  with the specified name or null.
        public JProperty? Property(string name)
        {
            return Property(name, StringComparison.Ordinal);
        }

        /// 
        /// Gets the  with the specified name.
        /// The exact name will be searched for first and if no matching property is found then
        /// the  will be used to match a property.
        /// 
        /// The property name.
        /// One of the enumeration values that specifies how the strings will be compared.
        /// A  matched with the specified name or null.
        public JProperty? Property(string name, StringComparison comparison)
        {
            if (name == null)
            {
                return null;
            }

            if (_properties.TryGetValue(name, out JToken? property))
            {
                return (JProperty)property;
            }

            // test above already uses this comparison so no need to repeat
            if (comparison != StringComparison.Ordinal)
            {
                for (int i = 0; i < _properties.Count; i++)
                {
                    JProperty p = (JProperty)_properties[i];
                    if (string.Equals(p.Name, name, comparison))
                    {
                        return p;
                    }
                }
            }

            return null;
        }

        /// 
        /// Gets a  of  of this object's property values.
        /// 
        /// A  of  of this object's property values.
        public JEnumerable PropertyValues()
        {
            return new JEnumerable(Properties().Select(p => p.Value));
        }

        /// 
        /// Gets the  with the specified key.
        /// 
        /// The  with the specified key.
        public override JToken? this[object key]
        {
            get
            {
                ValidationUtils.ArgumentNotNull(key, nameof(key));

                if (!(key is string propertyName))
                {
                    throw new ArgumentException("Accessed JObject values with invalid key value: {0}. Object property name expected.".FormatWith(CultureInfo.InvariantCulture, MiscellaneousUtils.ToString(key)));
                }

                return this[propertyName];
            }
            set
            {
                ValidationUtils.ArgumentNotNull(key, nameof(key));

                if (!(key is string propertyName))
                {
                    throw new ArgumentException("Set JObject values with invalid key value: {0}. Object property name expected.".FormatWith(CultureInfo.InvariantCulture, MiscellaneousUtils.ToString(key)));
                }

                this[propertyName] = value;
            }
        }

        /// 
        /// Gets or sets the  with the specified property name.
        /// 
        /// 
        public JToken? this[string propertyName]
        {
            get
            {
                ValidationUtils.ArgumentNotNull(propertyName, nameof(propertyName));

                JProperty? property = Property(propertyName, StringComparison.Ordinal);

                return property?.Value;
            }
            set
            {
                JProperty? property = Property(propertyName, StringComparison.Ordinal);
                if (property != null)
                {
                    property.Value = value!;
                }
                else
                {
#if HAVE_INOTIFY_PROPERTY_CHANGING
                    OnPropertyChanging(propertyName);
#endif
                    Add(propertyName, value);
                    OnPropertyChanged(propertyName);
                }
            }
        }

        /// 
        /// Loads a  from a .
        /// 
        /// A  that will be read for the content of the .
        /// A  that contains the JSON that was read from the specified .
        /// 
        ///      is not valid JSON.
        /// 
        public new static JObject Load(JsonReader reader)
        {
            return Load(reader, null);
        }

        /// 
        /// Loads a  from a .
        /// 
        /// A  that will be read for the content of the .
        /// The  used to load the JSON.
        /// If this is null, default load settings will be used.
        /// A  that contains the JSON that was read from the specified .
        /// 
        ///      is not valid JSON.
        /// 
        public new static JObject Load(JsonReader reader, JsonLoadSettings? settings)
        {
            ValidationUtils.ArgumentNotNull(reader, nameof(reader));

            if (reader.TokenType == JsonToken.None)
            {
                if (!reader.Read())
                {
                    throw JsonReaderException.Create(reader, "Error reading JObject from JsonReader.");
                }
            }

            reader.MoveToContent();

            if (reader.TokenType != JsonToken.StartObject)
            {
                throw JsonReaderException.Create(reader, "Error reading JObject from JsonReader. Current JsonReader item is not an object: {0}".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
            }

            JObject o = new JObject();
            o.SetLineInfo(reader as IJsonLineInfo, settings);

            o.ReadTokenFrom(reader, settings);

            return o;
        }

        /// 
        /// Load a  from a string that contains JSON.
        /// 
        /// A  that contains JSON.
        /// A  populated from the string that contains JSON.
        /// 
        ///      is not valid JSON.
        /// 
        /// 
        ///   
        /// 
        public new static JObject Parse(string json)
        {
            return Parse(json, null);
        }

        /// 
        /// Load a  from a string that contains JSON.
        /// 
        /// A  that contains JSON.
        /// The  used to load the JSON.
        /// If this is null, default load settings will be used.
        /// A  populated from the string that contains JSON.
        /// 
        ///      is not valid JSON.
        /// 
        /// 
        ///   
        /// 
        public new static JObject Parse(string json, JsonLoadSettings? settings)
        {
            using (JsonReader reader = new JsonTextReader(new StringReader(json)))
            {
                JObject o = Load(reader, settings);

                while (reader.Read())
                {
                    // Any content encountered here other than a comment will throw in the reader.
                }

                return o;
            }
        }

        /// 
        /// Creates a  from an object.
        /// 
        /// The object that will be used to create .
        /// A  with the values of the specified object.
        public new static JObject FromObject(object o)
        {
            return FromObject(o, JsonSerializer.CreateDefault());
        }

        /// 
        /// Creates a  from an object.
        /// 
        /// The object that will be used to create .
        /// The  that will be used to read the object.
        /// A  with the values of the specified object.
        public new static JObject FromObject(object o, JsonSerializer jsonSerializer)
        {
            JToken token = FromObjectInternal(o, jsonSerializer);

            if (token.Type != JTokenType.Object)
            {
                throw new ArgumentException("Object serialized to {0}. JObject instance expected.".FormatWith(CultureInfo.InvariantCulture, token.Type));
            }

            return (JObject)token;
        }

        /// 
        /// Writes this token to a .
        /// 
        /// A  into which this method will write.
        /// A collection of  which will be used when writing the token.
        public override void WriteTo(JsonWriter writer, params JsonConverter[] converters)
        {
            writer.WriteStartObject();

            for (int i = 0; i < _properties.Count; i++)
            {
                _properties[i].WriteTo(writer, converters);
            }

            writer.WriteEndObject();
        }

        /// 
        /// Gets the  with the specified property name.
        /// 
        /// Name of the property.
        /// The  with the specified property name.
        public JToken? GetValue(string? propertyName)
        {
            return GetValue(propertyName, StringComparison.Ordinal);
        }

        /// 
        /// Gets the  with the specified property name.
        /// The exact property name will be searched for first and if no matching property is found then
        /// the  will be used to match a property.
        /// 
        /// Name of the property.
        /// One of the enumeration values that specifies how the strings will be compared.
        /// The  with the specified property name.
        public JToken? GetValue(string? propertyName, StringComparison comparison)
        {
            if (propertyName == null)
            {
                return null;
            }

            // attempt to get value via dictionary first for performance
            var property = Property(propertyName, comparison);

            return property?.Value;
        }

        /// 
        /// Tries to get the  with the specified property name.
        /// The exact property name will be searched for first and if no matching property is found then
        /// the  will be used to match a property.
        /// 
        /// Name of the property.
        /// The value.
        /// One of the enumeration values that specifies how the strings will be compared.
        /// true if a value was successfully retrieved; otherwise, false.
        public bool TryGetValue(string propertyName, StringComparison comparison, [NotNullWhen(true)]out JToken? value)
        {
            value = GetValue(propertyName, comparison);
            return (value != null);
        }

        #region IDictionary Members
        /// 
        /// Adds the specified property name.
        /// 
        /// Name of the property.
        /// The value.
        public void Add(string propertyName, JToken? value)
        {
            Add(new JProperty(propertyName, value));
        }

        /// 
        /// Determines whether the JSON object has the specified property name.
        /// 
        /// Name of the property.
        /// true if the JSON object has the specified property name; otherwise, false.
        public bool ContainsKey(string propertyName)
        {
            ValidationUtils.ArgumentNotNull(propertyName, nameof(propertyName));

            return _properties.Contains(propertyName);
        }

        ICollection IDictionary.Keys => _properties.Keys;

        /// 
        /// Removes the property with the specified name.
        /// 
        /// Name of the property.
        /// true if item was successfully removed; otherwise, false.
        public bool Remove(string propertyName)
        {
            JProperty? property = Property(propertyName, StringComparison.Ordinal);
            if (property == null)
            {
                return false;
            }

            property.Remove();
            return true;
        }

        /// 
        /// Tries to get the  with the specified property name.
        /// 
        /// Name of the property.
        /// The value.
        /// true if a value was successfully retrieved; otherwise, false.
        public bool TryGetValue(string propertyName, [NotNullWhen(true)]out JToken? value)
        {
            JProperty? property = Property(propertyName, StringComparison.Ordinal);
            if (property == null)
            {
                value = null;
                return false;
            }

            value = property.Value;
            return true;
        }

        ICollection IDictionary.Values => throw new NotImplementedException();

        #endregion

        #region ICollection> Members
        void ICollection>.Add(KeyValuePair item)
        {
            Add(new JProperty(item.Key, item.Value));
        }

        void ICollection>.Clear()
        {
            RemoveAll();
        }

        bool ICollection>.Contains(KeyValuePair item)
        {
            JProperty? property = Property(item.Key, StringComparison.Ordinal);
            if (property == null)
            {
                return false;
            }

            return (property.Value == item.Value);
        }

        void ICollection>.CopyTo(KeyValuePair[] array, int arrayIndex)
        {
            if (array == null)
            {
                throw new ArgumentNullException(nameof(array));
            }
            if (arrayIndex < 0)
            {
                throw new ArgumentOutOfRangeException(nameof(arrayIndex), "arrayIndex is less than 0.");
            }
            if (arrayIndex >= array.Length && arrayIndex != 0)
            {
                throw new ArgumentException("arrayIndex is equal to or greater than the length of array.");
            }
            if (Count > array.Length - arrayIndex)
            {
                throw new ArgumentException("The number of elements in the source JObject is greater than the available space from arrayIndex to the end of the destination array.");
            }

            int index = 0;
            foreach (JProperty property in _properties)
            {
                array[arrayIndex + index] = new KeyValuePair(property.Name, property.Value);
                index++;
            }
        }

        bool ICollection>.IsReadOnly => false;

        bool ICollection>.Remove(KeyValuePair item)
        {
            if (!((ICollection>)this).Contains(item))
            {
                return false;
            }

            ((IDictionary)this).Remove(item.Key);
            return true;
        }
        #endregion

        internal override int GetDeepHashCode()
        {
            return ContentsHashCode();
        }

        /// 
        /// Returns an enumerator that can be used to iterate through the collection.
        /// 
        /// 
        /// A  that can be used to iterate through the collection.
        /// 
        public IEnumerator> GetEnumerator()
        {
            foreach (JProperty property in _properties)
            {
                yield return new KeyValuePair(property.Name, property.Value);
            }
        }

        /// 
        /// Raises the  event with the provided arguments.
        /// 
        /// Name of the property.
        protected virtual void OnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

#if HAVE_INOTIFY_PROPERTY_CHANGING
        /// 
        /// Raises the  event with the provided arguments.
        /// 
        /// Name of the property.
        protected virtual void OnPropertyChanging(string propertyName)
        {
            PropertyChanging?.Invoke(this, new PropertyChangingEventArgs(propertyName));
        }
#endif

#if HAVE_COMPONENT_MODEL
        // include custom type descriptor on JObject rather than use a provider because the properties are specific to a type

        #region ICustomTypeDescriptor
        PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties()
        {
            return ((ICustomTypeDescriptor)this).GetProperties(null);
        }

        PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties(Attribute[] attributes)
        {
            PropertyDescriptor[] propertiesArray = new PropertyDescriptor[Count];
            int i = 0;
            foreach (KeyValuePair propertyValue in this)
            {
                propertiesArray[i] = new JPropertyDescriptor(propertyValue.Key);
                i++;
            }

            return new PropertyDescriptorCollection(propertiesArray);
        }

        AttributeCollection ICustomTypeDescriptor.GetAttributes()
        {
            return AttributeCollection.Empty;
        }

        string? ICustomTypeDescriptor.GetClassName()
        {
            return null;
        }

        string? ICustomTypeDescriptor.GetComponentName()
        {
            return null;
        }

        TypeConverter ICustomTypeDescriptor.GetConverter()
        {
            return new TypeConverter();
        }

        EventDescriptor? ICustomTypeDescriptor.GetDefaultEvent()
        {
            return null;
        }

        PropertyDescriptor? ICustomTypeDescriptor.GetDefaultProperty()
        {
            return null;
        }

        object? ICustomTypeDescriptor.GetEditor(Type editorBaseType)
        {
            return null;
        }

        EventDescriptorCollection ICustomTypeDescriptor.GetEvents(Attribute[] attributes)
        {
            return EventDescriptorCollection.Empty;
        }

        EventDescriptorCollection ICustomTypeDescriptor.GetEvents()
        {
            return EventDescriptorCollection.Empty;
        }

        object? ICustomTypeDescriptor.GetPropertyOwner(PropertyDescriptor pd)
        {
            if (pd is JPropertyDescriptor)
            {
                return this;
            }

            return null;
        }
        #endregion

#endif

#if HAVE_DYNAMIC                            
        /// 
        /// Returns the  responsible for binding operations performed on this object.
        /// 
        /// The expression tree representation of the runtime value.
        /// 
        /// The  to bind this object.
        /// 
        protected override DynamicMetaObject GetMetaObject(Expression parameter)
        {
            return new DynamicProxyMetaObject(parameter, this, new JObjectDynamicProxy());
        }

        private class JObjectDynamicProxy : DynamicProxy
        {
            public override bool TryGetMember(JObject instance, GetMemberBinder binder, out object? result)
            {
                // result can be null
                result = instance[binder.Name];
                return true;
            }

            public override bool TrySetMember(JObject instance, SetMemberBinder binder, object value)
            {
                // this can throw an error if value isn't a valid for a JValue
                if (!(value is JToken v))
                {
                    v = new JValue(value);
                }

                instance[binder.Name] = v;
                return true;
            }

            public override IEnumerable GetDynamicMemberNames(JObject instance)
            {
                return instance.Properties().Select(p => p.Name);
            }
        }
#endif
    }
}