mcs/class/Microsoft.Build.Engine/Microsoft.Build.BuildEngine/BatchingImpl.cs

   1 //
   2 // BatchingImpl.cs: Class that implements BatchingAlgorithm from the wiki.
   3 //
   4 // Author:
   5 //   Marek Sieradzki (marek.sieradzki@gmail.com)
   6 //
   7 // (C) 2005 Marek Sieradzki
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27
  28 #if NET_2_0
  29
  30 using System;
  31 using System.IO;
  32 using System.Xml;
  33
  34 namespace Microsoft.Build.BuildEngine {
  35         internal class BatchingImpl {
  36
  37                 string          inputs;
  38                 string          outputs;
  39                 Project         project;
  40
  41                 public BatchingImpl (Project project, XmlElement targetElement)
  42                 {
  43                         if (targetElement == null)
  44                                 throw new ArgumentNullException ("targetElement");
  45                         if (project == null)
  46                                 throw new ArgumentNullException ("project");
  47
  48                         this.project = project;
  49
  50                         inputs = targetElement.GetAttribute ("Inputs");
  51                         outputs = targetElement.GetAttribute ("Outputs");
  52                 }
  53
  54                 public bool BuildNeeded ()
  55                 {
  56                         // FIXME: change this to ITaskItem instead of string
  57
  58                         Expression inputExpr, outputExpr;
  59                         string[] inputFiles, outputFiles;
  60                         DateTime oldestInput, youngestOutput;
  61
  62                         if (inputs == String.Empty) {
  63                                 return true;
  64                         }
  65                         if (outputs == String.Empty) {
  66                                 return true;
  67                         }
  68
  69                         inputExpr = new Expression (project, inputs);
  70                         outputExpr = new Expression (project, outputs);
  71
  72                         inputFiles = (string[]) inputExpr.ToArray (typeof (string[]));
  73                         outputFiles = (string[]) outputExpr.ToArray (typeof (string[]));
  74
  75                         if (inputFiles == null) {
  76                                 return true;
  77                         }
  78                         if (outputFiles == null) {
  79                                 return true;
  80                         }
  81                         if (inputFiles.Length == 0) {
  82                                 return true;
  83                         }
  84                         if (outputFiles.Length == 0) {
  85                                 return true;
  86                         }
  87
  88                         if (File.Exists (inputFiles [0])) {
  89                                 oldestInput = File.GetLastWriteTime (inputFiles [0]);
  90                         } else {
  91                                 return true;
  92                         }
  93                         if (File.Exists (outputFiles [0])) {
  94                                 youngestOutput = File.GetLastWriteTime (outputFiles [0]);
  95                         } else {
  96                                 return true;
  97                         }
  98
  99                         foreach (string file in inputFiles) {
 100                                 if (file.Trim () == String.Empty)
 101                                         continue;
 102
 103                                 if (File.Exists (file.Trim ())) {
 104                                         if (File.GetLastWriteTime (file.Trim ()) > oldestInput)
 105                                                 oldestInput = File.GetLastWriteTime (file.Trim ());
 106                                 } else {
 107                                         return true;
 108                                 }
 109                         }
 110                         foreach (string file in outputFiles) {
 111                                 if (file.Trim () == String.Empty)
 112                                         continue;
 113
 114                                 if (File.Exists (file.Trim ())) {
 115                                         if (File.GetLastWriteTime (file.Trim ()) < youngestOutput)
 116                                                 youngestOutput = File.GetLastWriteTime (file.Trim ());
 117                                 } else {
 118                                         return true;
 119                                 }
 120                         }
 121
 122                         if (oldestInput > youngestOutput) {
 123                                 return true;
 124                         }
 125                         else {
 126                                 return false;
 127                         }
 128                 }
 129
 130                 public bool BatchBuildTask (BuildTask buildTask)
 131                 {
 132                         return buildTask.Execute ();
 133                 }
 134         }
 135 }
 136
 137 #endif