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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.Xml
{
using System;
using System.Xml;
using System.Text;
using System.Diagnostics;
using System.Runtime.Serialization;
public class XmlDictionaryString
{
internal const int MinKey = 0;
internal const int MaxKey = int.MaxValue / 4;
IXmlDictionary dictionary;
string value;
int key;
byte[] buffer;
static EmptyStringDictionary emptyStringDictionary = new EmptyStringDictionary();
public XmlDictionaryString(IXmlDictionary dictionary, string value, int key)
{
if (dictionary == null)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("dictionary"));
if (value == null)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("value"));
if (key < MinKey || key > MaxKey)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("key", SR.GetString(SR.ValueMustBeInRange, MinKey, MaxKey)));
this.dictionary = dictionary;
this.value = value;
this.key = key;
}
static internal string GetString(XmlDictionaryString s)
{
if (s == null)
return null;
return s.Value;
}
static public XmlDictionaryString Empty
{
get
{
return emptyStringDictionary.EmptyString;
}
}
public IXmlDictionary Dictionary
{
get
{
return dictionary;
}
}
public int Key
{
get
{
return key;
}
}
public string Value
{
get
{
return value;
}
}
internal byte[] ToUTF8()
{
if (buffer == null)
buffer = System.Text.Encoding.UTF8.GetBytes(value);
return buffer;
}
public override string ToString()
{
return value;
}
class EmptyStringDictionary : IXmlDictionary
{
XmlDictionaryString empty;
public EmptyStringDictionary()
{
empty = new XmlDictionaryString(this, string.Empty, 0);
}
public XmlDictionaryString EmptyString
{
get
{
return empty;
}
}
public bool TryLookup(string value, out XmlDictionaryString result)
{
if (value == null)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("value");
if (value.Length == 0)
{
result = empty;
return true;
}
result = null;
return false;
}
public bool TryLookup(int key, out XmlDictionaryString result)
{
if (key == 0)
{
result = empty;
return true;
}
result = null;
return false;
}
public bool TryLookup(XmlDictionaryString value, out XmlDictionaryString result)
{
if (value == null)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("value"));
if (value.Dictionary != this)
{
result = null;
return false;
}
result = value;
return true;
}
}
}
}
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