// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Collections;
using System.Xml.Serialization;
 
namespace System.Xml.Schema
{
    public class XmlSchemaAttributeGroup : XmlSchemaAnnotated
    {
        private string? _name;
        private XmlSchemaObjectCollection _attributes = new XmlSchemaObjectCollection();
        private XmlSchemaAnyAttribute? _anyAttribute;
        private XmlQualifiedName _qname = XmlQualifiedName.Empty;
        private XmlSchemaAttributeGroup? _redefined;
        private XmlSchemaObjectTable? _attributeUses;
        private XmlSchemaAnyAttribute? _attributeWildcard;
        private int _selfReferenceCount;
 
        [XmlAttribute("name")]
        public string? Name
        {
            get { return _name; }
            set { _name = value; }
        }
 
        [XmlElement("attribute", typeof(XmlSchemaAttribute)),
         XmlElement("attributeGroup", typeof(XmlSchemaAttributeGroupRef))]
        public XmlSchemaObjectCollection Attributes
        {
            get { return _attributes; }
        }
 
        [XmlElement("anyAttribute")]
        public XmlSchemaAnyAttribute? AnyAttribute
        {
            get { return _anyAttribute; }
            set { _anyAttribute = value; }
        }
 
        [XmlIgnore]
        public XmlQualifiedName QualifiedName
        {
            get { return _qname; }
        }
 
        [XmlIgnore]
        internal XmlSchemaObjectTable AttributeUses => _attributeUses ??= new XmlSchemaObjectTable();
 
        [XmlIgnore]
        internal XmlSchemaAnyAttribute? AttributeWildcard
        {
            get { return _attributeWildcard; }
            set { _attributeWildcard = value; }
        }
 
        [XmlIgnore]
        public XmlSchemaAttributeGroup? RedefinedAttributeGroup
        {
            get { return _redefined; }
        }
 
        [XmlIgnore]
        internal XmlSchemaAttributeGroup? Redefined
        {
            get { return _redefined; }
            set { _redefined = value; }
        }
 
        [XmlIgnore]
        internal int SelfReferenceCount
        {
            get { return _selfReferenceCount; }
            set { _selfReferenceCount = value; }
        }
 
        [XmlIgnore]
        internal override string? NameAttribute
        {
            get { return Name; }
            set { Name = value; }
        }
 
        internal void SetQualifiedName(XmlQualifiedName value)
        {
            _qname = value;
        }
 
        internal override XmlSchemaObject Clone()
        {
            XmlSchemaAttributeGroup newGroup = (XmlSchemaAttributeGroup)MemberwiseClone();
            if (XmlSchemaComplexType.HasAttributeQNameRef(_attributes))
            { //If a ref/type name is present
                newGroup._attributes = XmlSchemaComplexType.CloneAttributes(_attributes);
 
                //Clear compiled tables
                newGroup._attributeUses = null;
            }
            return newGroup;
        }
    }
}