internal void InitChain(ExtensionChain chain, ChainedExtension next)
{
this.chain = chain;
nextInChain = next;
InitializeChain(next);
}
internal static T CreateChain <T> (ChainedExtension next) where T : ChainedExtension, new()
{
var first = new T();
first.nextInChain = ChainedExtension.FindNextImplementation <T> (next);
return(first);
}
internal void AddExtension(ChainedExtension ext, ChainedExtension insertAfter = null, ChainedExtension insertBefore = null)
{
int index;
if (insertBefore != null)
{
index = Array.IndexOf(extensions, insertBefore);
}
else if (insertAfter != null)
{
index = Array.IndexOf(extensions, insertAfter);
if (index != -1)
{
index++;
}
}
else if (defaultInsertBefore != null)
{
index = Array.IndexOf(extensions, defaultInsertBefore);
}
else
{
index = extensions.Length;
}
Array.Resize(ref extensions, extensions.Length + 1);
for (int n = extensions.Length - 1; n > index; n--)
{
extensions [n] = extensions [n - 1];
}
extensions [index] = ext;
Rechain();
}
internal void RemoveExtension(ChainedExtension ext)
{
if (extensions == null)
{
return;
}
extensions = extensions.Where(e => e != ext).ToArray();
Rechain();
}
public T GetExtension <T> () where T : ChainedExtension, new()
{
ChainedExtension e;
if (!chains.TryGetValue(typeof(T), out e))
{
e = new T();
e.InitChain(this, ChainedExtension.FindNextImplementation <T> (extensions[0]));
chains [typeof(T)] = e;
}
return((T)e);
}
public void Update(ExtensionChain chain, Type type, int firstChainChangeIndex)
{
// We only want to update an extension if we insert somewhere before the extension we found.
if (extensionIndex < firstChainChangeIndex)
{
return;
}
// Maybe it would be useful to skip extensions until min(indices), as they've already been scanned
// in a previous check
var impl = ChainedExtension.FindNextImplementation(type, chain.extensions[0], out extensionIndex);
Extension.InitChain(chain, impl);
}
internal static ChainedExtension FindNextImplementation(Type type, ChainedExtension next)
{
if (next == null)
{
return(null);
}
if (!type.IsInstanceOfType(next))
{
return(FindNextImplementation(type, next.nextInChain));
}
foreach (var m in type.GetMembers(BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance))
{
MethodInfo method = m as MethodInfo;
if (method == null)
{
var prop = m as PropertyInfo;
if (prop != null)
{
method = prop.GetGetMethod();
if (method == null)
{
method = prop.GetSetMethod();
}
}
}
if (method != null && method.IsVirtual && method.Name != "InitializeChain")
{
var tm = next.GetType().GetMethod(method.Name, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance, null, method.GetParameters().Select(p => p.ParameterType).ToArray(), null);
if (tm == null)
{
continue;
}
if (tm.DeclaringType != type)
{
return(next);
}
}
}
// Serializable fields and properties
if (next.GetType().GetMembers(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance).Any(m => m.IsDefined(typeof(MonoDevelop.Core.Serialization.ItemPropertyAttribute))))
{
return(next);
}
return(FindNextImplementation(type, next.nextInChain));
}
void Rechain()
{
// Re-chain every extension
for (int n = extensions.Length - 2; n >= 0; n--)
{
extensions [n].InitChain(this, extensions [n + 1]);
}
// The first extension object in type-specific chains is a placeholder extension used only to hold
// a reference to the real first extension.
foreach (var fex in chains)
{
fex.Value.InitChain(this, ChainedExtension.FindNextImplementation(fex.Key, extensions[0]));
}
}
static ChainedExtension FindNextImplementation_Internal(Type type, ChainedExtension next, ref int position)
{
if (next == null)
{
return(null);
}
position++;
if (!type.IsInstanceOfType(next))
{
return(FindNextImplementation_Internal(type, next.nextInChain, ref position));
}
// Maybe it would make sense to cache these, but not sure if we should.
foreach (var method in type.GetMethods(BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance))
{
if (method != null && method.IsVirtual && method.Name != "InitializeChain")
{
var paramArray = method.GetParameters();
var paramTypeArray = new Type [paramArray.Length];
for (int i = 0; i < paramArray.Length; ++i)
{
paramTypeArray [i] = paramArray [i].ParameterType;
}
var tm = next.GetType().GetMethod(method.Name, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance, null, paramTypeArray, null);
if (tm == null)
{
continue;
}
if (tm.DeclaringType != type)
{
return(next);
}
}
}
// Serializable fields and properties
foreach (var m in next.GetType().GetMembers(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance))
{
if (m.IsDefined(typeof(MonoDevelop.Core.Serialization.ItemPropertyAttribute)))
{
return(next);
}
}
return(FindNextImplementation_Internal(type, next.nextInChain, ref position));
}
internal void RemoveExtension(ChainedExtension ext)
{
if (extensions == null)
{
return;
}
int index = extensions.Length;
extensions = extensions.Where((e, eindex) => {
bool shouldRemove = e == ext;
if (shouldRemove)
{
index = eindex;
}
return(!shouldRemove);
}).ToArray();
Rechain(index);
}
internal protected override void InitializeChain(ChainedExtension next)
{
base.InitializeChain(next);
this.next = FindNextImplementation <SolutionItemExtension> (next);
}
internal protected virtual void InitializeChain(ChainedExtension next)
{
}
internal protected static T FindNextImplementation <T> (ChainedExtension next) where T : ChainedExtension
{
return((T)FindNextImplementation(typeof(T), next));
}
internal void RemoveExtension(ChainedExtension ext)
{
extensions = extensions.Where(e => e != ext).ToArray();
Rechain();
}
internal protected override void InitializeChain(ChainedExtension next)
{
base.InitializeChain(next);
this.next = FindNextImplementation <WorkspaceObjectExtension> (next);
}
internal static ChainedExtension FindNextImplementation(Type type, ChainedExtension next, out int position)
{
position = -1;
return(FindNextImplementation_Internal(type, next, ref position));
}
protected internal override void InitializeChain(ChainedExtension next)
{
InitializedCount++;
base.InitializeChain(next);
}
internal void AddExtension(ChainedExtension ext)
{
Array.Resize(ref extensions, extensions.Length + 1);
extensions [extensions.Length - 1] = ext;
Rechain();
}
public ChainedExtensionSentinel(ChainedExtension extension)
{
Extension = extension;
}
internal void SetDefaultInsertionPosition(ChainedExtension insertBefore)
{
defaultInsertBefore = insertBefore;
}