// Must return true if the context to serialize for (givenContext)
// is a subset of the context for which the serialization selector is provided (presentContext)
// Note: This is done by overriding KeyEquals rather than overriding Equals() in the SurrogateKey
// class because Equals() method must be commutative.
protected override bool KeyEquals(Object key, Object item)
{
SurrogateKey givenValue = (SurrogateKey)item;
SurrogateKey presentValue = (SurrogateKey)key;
return(presentValue.m_type == givenValue.m_type &&
(presentValue.m_context.m_state & givenValue.m_context.m_state) == givenValue.m_context.m_state &&
presentValue.m_context.Context == givenValue.m_context.Context);
}
// Removes the surrogate associated with a given type. Does not
// check chained surrogates.
public virtual void RemoveSurrogate(Type type, StreamingContext context)
{
if (type == null)
{
throw new ArgumentNullException("type");
}
Contract.EndContractBlock();
SurrogateKey key = new SurrogateKey(type, context);
m_surrogates.Remove(key);
}
// Adds a surrogate to the list of surrogates checked.
public virtual void AddSurrogate(Type type, StreamingContext context, ISerializationSurrogate surrogate)
{
if (type == null)
{
throw new ArgumentNullException("type");
}
if (surrogate == null)
{
throw new ArgumentNullException("surrogate");
}
Contract.EndContractBlock();
SurrogateKey key = new SurrogateKey(type, context);
m_surrogates.Add(key, surrogate); // Hashtable does duplicate checking.
}
// Gets the surrogate for a particular type. If this selector can't
// provide a surrogate, it checks with all of it's children before returning null.
// [System.Security.SecurityCritical] // auto-generated_required
public virtual ISerializationSurrogate GetSurrogate(Type type, StreamingContext context, out ISurrogateSelector selector)
{
if (type == null)
{
throw new ArgumentNullException("type");
}
Contract.EndContractBlock();
selector = this;
SurrogateKey key = new SurrogateKey(type, context);
ISerializationSurrogate temp = (ISerializationSurrogate)m_surrogates[key];
if (temp != null)
{
return(temp);
}
if (m_nextSelector != null)
{
return(m_nextSelector.GetSurrogate(type, context, out selector));
}
return(null);
}