StringHandle.cs source code in C# .NET

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Code:

/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / Serialization / System / Xml / StringHandle.cs / 1 / StringHandle.cs

                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.Xml 
{
    using System.Runtime.Serialization; 
    using System.Diagnostics; 

    enum StringHandleConstStringType 
    {
        Type = 0,
        Root = 1,
        Item = 2 
    }
 
    class StringHandle 
    {
        XmlBufferReader bufferReader; 
        StringHandleType type;
        int key;
        int offset;
        int length; 
        static string[] constStrings = {
                                            "type", 
                                            "root", 
                                            "item"
                                       }; 

        public StringHandle(XmlBufferReader bufferReader)
        {
            this.bufferReader = bufferReader; 
            SetValue(0, 0);
        } 
 
        public void SetValue(int offset, int length)
        { 
            this.type = StringHandleType.UTF8;
            this.offset = offset;
            this.length = length;
        } 

        public void SetConstantValue(StringHandleConstStringType constStringType) 
        { 
            type = StringHandleType.ConstString;
            key = (int) constStringType; 
        }

        public void SetValue(int offset, int length, bool escaped)
        { 
            this.type = (escaped ? StringHandleType.EscapedUTF8 : StringHandleType.UTF8);
            this.offset = offset; 
            this.length = length; 
        }
 
        public void SetValue(int key)
        {
            this.type = StringHandleType.Dictionary;
            this.key = key; 
        }
 
        public void SetValue(StringHandle value) 
        {
            this.type = value.type; 
            this.key = value.key;
            this.offset = value.offset;
            this.length = value.length;
        } 

        public bool IsEmpty 
        { 
            get
            { 
                if (type == StringHandleType.UTF8)
                    return length == 0;
                return Equals2(string.Empty);
            } 
        }
 
        public bool IsXmlns 
        {
            get 
            {
                if (type == StringHandleType.UTF8)
                {
                    if (this.length != 5) 
                        return false;
                    byte[] buffer = bufferReader.Buffer; 
                    int offset = this.offset; 
                    return buffer[offset + 0] == 'x' &&
                           buffer[offset + 1] == 'm' && 
                           buffer[offset + 2] == 'l' &&
                           buffer[offset + 3] == 'n' &&
                           buffer[offset + 4] == 's';
                } 
                return Equals2("xmlns");
            } 
        } 

        public void ToPrefixHandle(PrefixHandle prefix) 
        {
            DiagnosticUtility.DebugAssert(type == StringHandleType.UTF8, "");
            prefix.SetValue(offset, length);
        } 

        public string GetString(XmlNameTable nameTable) 
        { 
            StringHandleType type = this.type;
            if (type == StringHandleType.UTF8) 
                return bufferReader.GetString(offset, length, nameTable);
            if (type == StringHandleType.Dictionary)
                return nameTable.Add(bufferReader.GetDictionaryString(key).Value);
            if (type == StringHandleType.ConstString) 
                return nameTable.Add(constStrings[key]);
            DiagnosticUtility.DebugAssert(type == StringHandleType.EscapedUTF8, ""); 
            return bufferReader.GetEscapedString(offset, length, nameTable); 
        }
 
        public string GetString()
        {
            StringHandleType type = this.type;
            if (type == StringHandleType.UTF8) 
                return bufferReader.GetString(offset, length);
            if (type == StringHandleType.Dictionary) 
                return bufferReader.GetDictionaryString(key).Value; 
            if (type == StringHandleType.ConstString)
                return constStrings[key]; 
            DiagnosticUtility.DebugAssert(type == StringHandleType.EscapedUTF8, "");
            return bufferReader.GetEscapedString(offset, length);
        }
 
        public byte[] GetString(out int offset, out int length)
        { 
            StringHandleType type = this.type; 
            if (type == StringHandleType.UTF8)
            { 
                offset = this.offset;
                length = this.length;
                return bufferReader.Buffer;
            } 
            if (type == StringHandleType.Dictionary)
            { 
                byte[] buffer = bufferReader.GetDictionaryString(this.key).ToUTF8(); 
                offset = 0;
                length = buffer.Length; 
                return buffer;
            }
            if (type == StringHandleType.ConstString)
            { 
                byte[] buffer = XmlConverter.ToBytes(constStrings[key]);
                offset = 0; 
                length = buffer.Length; 
                return buffer;
            } 
            else
            {
                DiagnosticUtility.DebugAssert(type == StringHandleType.EscapedUTF8, "");
                byte[] buffer = XmlConverter.ToBytes(bufferReader.GetEscapedString(this.offset, this.length)); 
                offset = 0;
                length = buffer.Length; 
                return buffer; 
            }
        } 

        public bool TryGetDictionaryString(out XmlDictionaryString value)
        {
            if (type == StringHandleType.Dictionary) 
            {
                value = bufferReader.GetDictionaryString(key); 
                return true; 
            }
            else if (IsEmpty) 
            {
                value = XmlDictionaryString.Empty;
                return true;
            } 

            value = null; 
            return false; 
        }
 
        public override string ToString()
        {
            return GetString();
        } 

        bool Equals2(int key2, XmlBufferReader bufferReader2) 
        { 
            StringHandleType type = this.type;
            if (type == StringHandleType.Dictionary) 
                return bufferReader.Equals2(this.key, key2, bufferReader2);
            if (type == StringHandleType.UTF8)
                return bufferReader.Equals2(this.offset, this.length, bufferReader2.GetDictionaryString(key2).Value);
            DiagnosticUtility.DebugAssert(type == StringHandleType.EscapedUTF8 || type == StringHandleType.ConstString, ""); 
            return GetString() == bufferReader.GetDictionaryString(key2).Value;
        } 
 
        bool Equals2(XmlDictionaryString xmlString2)
        { 
            StringHandleType type = this.type;
            if (type == StringHandleType.Dictionary)
                return bufferReader.Equals2(this.key, xmlString2);
            if (type == StringHandleType.UTF8) 
                return bufferReader.Equals2(this.offset, this.length, xmlString2.ToUTF8());
            DiagnosticUtility.DebugAssert(type == StringHandleType.EscapedUTF8 || type == StringHandleType.ConstString, ""); 
            return GetString() == xmlString2.Value; 
        }
 
        bool Equals2(string s2)
        {
            StringHandleType type = this.type;
            if (type == StringHandleType.Dictionary) 
                return bufferReader.GetDictionaryString(this.key).Value == s2;
            if (type == StringHandleType.UTF8) 
                return bufferReader.Equals2(this.offset, this.length, s2); 
            DiagnosticUtility.DebugAssert(type == StringHandleType.EscapedUTF8 || type == StringHandleType.ConstString, "");
            return GetString() == s2; 
        }

        bool Equals2(int offset2, int length2, XmlBufferReader bufferReader2)
        { 
            StringHandleType type = this.type;
            if (type == StringHandleType.Dictionary) 
                return bufferReader2.Equals2(offset2, length2, bufferReader.GetDictionaryString(this.key).Value); 
            if (type == StringHandleType.UTF8)
                return bufferReader.Equals2(this.offset, this.length, bufferReader2, offset2, length2); 
            DiagnosticUtility.DebugAssert(type == StringHandleType.EscapedUTF8 || type == StringHandleType.ConstString, "");
            return GetString() == bufferReader.GetString(offset2, length2);
        }
 
        bool Equals2(StringHandle s2)
        { 
            StringHandleType type = s2.type; 
            if (type == StringHandleType.Dictionary)
                return Equals2(s2.key, s2.bufferReader); 
            if (type == StringHandleType.UTF8)
                return Equals2(s2.offset, s2.length, s2.bufferReader);
            DiagnosticUtility.DebugAssert(type == StringHandleType.EscapedUTF8 || type == StringHandleType.ConstString, "");
            return Equals2(s2.GetString()); 
        }
 
        static public bool operator ==(StringHandle s1, XmlDictionaryString xmlString2) 
        {
            return s1.Equals2(xmlString2); 
        }

        static public bool operator !=(StringHandle s1, XmlDictionaryString xmlString2)
        { 
            return !s1.Equals2(xmlString2);
        } 
 
        static public bool operator ==(StringHandle s1, string s2)
        { 
            return s1.Equals2(s2);
        }

        static public bool operator !=(StringHandle s1, string s2) 
        {
            return !s1.Equals2(s2); 
        } 

        static public bool operator ==(StringHandle s1, StringHandle s2) 
        {
            return s1.Equals2(s2);
        }
 
        static public bool operator !=(StringHandle s1, StringHandle s2)
        { 
            return !s1.Equals2(s2); 
        }
 
        public int CompareTo(StringHandle that)
        {
            if (this.type == StringHandleType.UTF8 && that.type == StringHandleType.UTF8)
                return bufferReader.Compare(this.offset, this.length, that.offset, that.length); 
            else
                return string.Compare(this.GetString(), that.GetString(), StringComparison.Ordinal); 
        } 

        public override bool Equals(object obj) 
        {
            StringHandle that = obj as StringHandle;
            if (object.ReferenceEquals(that, null))
                return false; 
            return this == that;
        } 
 
        public override int GetHashCode()
        { 
            return GetString().GetHashCode();
        }

        enum StringHandleType 
        {
            Dictionary, 
            UTF8, 
            EscapedUTF8,
            ConstString 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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