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Ctor.cs

// GtkSharp.Generation.Ctor.cs - The Constructor Generation Class.
//
// Author: Mike Kestner <mkestner@novell.com>
//
// Copyright (c) 2001-2003 Mike Kestner
// Copyright (c) 2004-2005 Novell, Inc.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 2 of the GNU General Public
// License as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public
// License along with this program; if not, write to the
// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.


namespace GtkSharp.Generation {

      using System;
      using System.Collections;
      using System.IO;
      using System.Xml;

      public class Ctor : MethodBase  {

            private bool preferred;
            private string name;
            private bool needs_chaining = false;

            public Ctor (XmlElement elem, ClassBase implementor) : base (elem, implementor) 
            {
                  if (elem.HasAttribute ("preferred"))
                        preferred = true;
                  if (implementor is ObjectGen)
                        needs_chaining = true;
                  name = implementor.Name;
            }

            public bool Preferred {
                  get { return preferred; }
                  set { preferred = value; }
            }

            public string StaticName {
                  get {
                        if (!IsStatic)
                              return String.Empty;

                        string[] toks = CName.Substring(CName.IndexOf("new")).Split ('_');
                        string result = String.Empty;

                        foreach (string tok in toks)
                              result += tok.Substring(0,1).ToUpper() + tok.Substring(1);
                        return result;
                  }
            }

            void GenerateImport (StreamWriter sw)
            {
                  sw.WriteLine("\t\t[DllImport(\"" + LibraryName + "\")]");
                  sw.WriteLine("\t\tstatic extern " + Safety + "IntPtr " + CName + "(" + Parameters.ImportSignature + ");");
                  sw.WriteLine();
            }

            void GenerateStatic (GenerationInfo gen_info)
            {
                  StreamWriter sw = gen_info.Writer;
                  sw.WriteLine("\t\t" + Protection + " static " + Safety + Modifiers +  name + " " + StaticName + "(" + Signature + ")");
                  sw.WriteLine("\t\t{");

                  Body.Initialize(gen_info, false, false, ""); 

                  sw.Write("\t\t\t" + name + " result = ");
                  if (container_type is StructBase)
                        sw.Write ("{0}.New (", name);
                  else
                        sw.Write ("new {0} (", name);
                  sw.WriteLine (CName + "(" + Body.GetCallString (false) + "));");
                  Body.Finish (sw, ""); 
                  Body.HandleException (sw, ""); 
                  sw.WriteLine ("\t\t\treturn result;");
            }

            public void Generate (GenerationInfo gen_info)
            {
                  if (!Validate ())
                        return;

                  StreamWriter sw = gen_info.Writer;
                  gen_info.CurrentMember = CName;

                  GenerateImport (sw);
                  
                  if (IsStatic)
                        GenerateStatic (gen_info);
                  else {
                        sw.WriteLine("\t\t{0} {1}{2} ({3}) {4}", Protection, Safety, name, Signature.ToString(), needs_chaining ? ": base (IntPtr.Zero)" : "");
                        sw.WriteLine("\t\t{");

                        if (needs_chaining) {
                              sw.WriteLine ("\t\t\tif (GetType () != typeof (" + name + ")) {");
                              
                              if (Parameters.Count == 0) {
                                    sw.WriteLine ("\t\t\t\tCreateNativeObject (new string [0], new GLib.Value[0]);");
                                    sw.WriteLine ("\t\t\t\treturn;");
                              } else {
                                    ArrayList names = new ArrayList ();
                                    ArrayList values = new ArrayList ();
                                    for (int i = 0; i < Parameters.Count; i++) {
                                          Parameter p = Parameters[i];
                                          if (container_type.GetPropertyRecursively (p.StudlyName) != null) {
                                                names.Add (p.Name);
                                                values.Add (p.Name);
                                          } else if (p.PropertyName != String.Empty) {
                                                names.Add (p.PropertyName);
                                                values.Add (p.Name);
                                          }
                                    }

                                    if (names.Count == Parameters.Count) {
                                          sw.WriteLine ("\t\t\t\tArrayList vals = new ArrayList();");
                                          sw.WriteLine ("\t\t\t\tArrayList names = new ArrayList();");
                                          for (int i = 0; i < names.Count; i++) {
                                                Parameter p = Parameters [i];
                                                string indent = "\t\t\t\t";
                                                if (p.Generatable is ClassBase && !(p.Generatable is StructBase)) {
                                                      sw.WriteLine (indent + "if (" + p.Name + " != null) {");
                                                      indent += "\t";
                                                }
                                                sw.WriteLine (indent + "names.Add (\"" + names [i] + "\");");
                                                sw.WriteLine (indent + "vals.Add (new GLib.Value (" + values[i] + "));");

                                                if (p.Generatable is ClassBase && !(p.Generatable is StructBase))
                                                      sw.WriteLine ("\t\t\t\t}");
                                          }

                                          sw.WriteLine ("\t\t\t\tCreateNativeObject ((string[])names.ToArray (typeof (string)), (GLib.Value[])vals.ToArray (typeof (GLib.Value)));");
                                          sw.WriteLine ("\t\t\t\treturn;");
                                    } else
                                          sw.WriteLine ("\t\t\t\tthrow new InvalidOperationException (\"Can't override this constructor.\");");
                              }
                              
                              sw.WriteLine ("\t\t\t}");
                        }
      
                        Body.Initialize(gen_info, false, false, ""); 
                        sw.WriteLine("\t\t\t{0} = {1}({2});", container_type.AssignToName, CName, Body.GetCallString (false));
                        Body.Finish (sw, "");
                        Body.HandleException (sw, "");
                  }
                  
                  sw.WriteLine("\t\t}");
                  sw.WriteLine();
                  
                  Statistics.CtorCount++;
            }
      }
}


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