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 using System;
  29 using System.IO;
  30 using System.Xml;
  31
  32 namespace Microsoft.Build.BuildEngine {
  33         internal class BatchingImpl {
  34
  35                 string          inputs;
  36                 string          outputs;
  37                 Project         project;
  38
  39                 public BatchingImpl (Project project, XmlElement targetElement)
  40                 {
  41                         if (targetElement == null)
  42                                 throw new ArgumentNullException ("targetElement");
  43                         if (project == null)
  44                                 throw new ArgumentNullException ("project");
  45
  46                         this.project = project;
  47
  48                         inputs = targetElement.GetAttribute ("Inputs");
  49                         outputs = targetElement.GetAttribute ("Outputs");
  50                 }
  51
  52                 public bool BuildNeeded ()
  53                 {
  54                         // FIXME: change this to ITaskItem instead of string
  55
  56                         Expression inputExpr, outputExpr;
  57                         string[] inputFiles, outputFiles;
  58                         DateTime oldestInput, youngestOutput;
  59
  60                         if (inputs == String.Empty) {
  61                                 return true;
  62                         }
  63                         if (outputs == String.Empty) {
  64                                 return true;
  65                         }
  66
  67                         inputExpr = new Expression (project, inputs);
  68                         outputExpr = new Expression (project, outputs);
  69
  70                         inputFiles = (string[]) inputExpr.ToArray (typeof (string[]));
  71                         outputFiles = (string[]) outputExpr.ToArray (typeof (string[]));
  72
  73                         if (inputFiles == null) {
  74                                 return true;
  75                         }
  76                         if (outputFiles == null) {
  77                                 return true;
  78                         }
  79                         if (inputFiles.Length == 0) {
  80                                 return true;
  81                         }
  82                         if (outputFiles.Length == 0) {
  83                                 return true;
  84                         }
  85
  86                         if (File.Exists (inputFiles [0])) {
  87                                 oldestInput = File.GetLastWriteTime (inputFiles [0]);
  88                         } else {
  89                                 return true;
  90                         }
  91                         if (File.Exists (outputFiles [0])) {
  92                                 youngestOutput = File.GetLastWriteTime (outputFiles [0]);
  93                         } else {
  94                                 return true;
  95                         }
  96
  97                         foreach (string file in inputFiles) {
  98                                 if (file.Trim () == String.Empty)
  99                                         continue;
 100
 101                                 if (File.Exists (file.Trim ())) {
 102                                         if (File.GetLastWriteTime (file.Trim ()) > oldestInput)
 103                                                 oldestInput = File.GetLastWriteTime (file.Trim ());
 104                                 } else {
 105                                         return true;
 106                                 }
 107                         }
 108                         foreach (string file in outputFiles) {
 109                                 if (file.Trim () == String.Empty)
 110                                         continue;
 111
 112                                 if (File.Exists (file.Trim ())) {
 113                                         if (File.GetLastWriteTime (file.Trim ()) < youngestOutput)
 114                                                 youngestOutput = File.GetLastWriteTime (file.Trim ());
 115                                 } else {
 116                                         return true;
 117                                 }
 118                         }
 119
 120                         if (oldestInput > youngestOutput) {
 121                                 return true;
 122                         }
 123                         else {
 124                                 return false;
 125                         }
 126                 }
 127
 128                 public bool BatchTaskElement (TaskElement taskElement)
 129                 {
 130                         return taskElement.Execute ();
 131                 }
 132         }
 133 }