Tools/Source/GenBuild/org/tianocore/build/global/OnDependency.java

   1 /** @file
   2 This file is to define OnDependency class.
   3
   4 Copyright (c) 2006, Intel Corporation
   5 All rights reserved. This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 --*/
  14 package org.tianocore.build.global;
  15
  16 import java.io.File;
  17 import java.util.HashMap;
  18 import java.util.Iterator;
  19 import java.util.Map;
  20
  21 import org.apache.tools.ant.BuildException;
  22 import org.apache.tools.ant.Task;
  23 import org.apache.tools.ant.taskdefs.Sequential;
  24 import org.tianocore.common.logger.EdkLog;
  25
  26 /**
  27  Class OnDepdendency is used to check the timestamp between source files and
  28  target files, which can be used to determine if the target files are needed to
  29  be re-generated from source files.
  30  **/
  31 public class OnDependency extends Task {
  32     ///
  33     /// cache the modified timestamp of files accessed, to speed up the depencey check
  34     ///
  35     private Map<String, Long> timeStampCache = new HashMap<String, Long>();
  36     ///
  37     /// source files list
  38     ///
  39     private DpFileList sources = null;
  40     ///
  41     /// target files list
  42     ///
  43     private DpFileList targets = null;
  44     ///
  45     /// tasks to be performed to generate target files
  46     ///
  47     private Sequential  task = null;
  48
  49     ///
  50     /// An empty constructor for an ANT task can avoid some potential issues
  51     ///
  52     public OnDependency(){
  53     }
  54
  55     /**
  56      Standard execute method of ANT task
  57      **/
  58     public void execute() throws BuildException {
  59         if (isOutOfDate() && task != null) {
  60             task.perform();
  61         }
  62     }
  63
  64     ///
  65     /// check if the target files are outofdate
  66     ///
  67     private boolean isOutOfDate() {
  68         ///
  69         /// if no source files specified, take it as a fresh start
  70         ///
  71         if (sources.nameList.size() == 0) {
  72             EdkLog.log(this, EdkLog.EDK_VERBOSE, "No source file spcified!");
  73             return true;
  74         }
  75
  76         Iterator dstIt = targets.nameList.iterator();
  77         while (dstIt.hasNext()) {
  78             String dstFileName = (String)dstIt.next();
  79             File dstFile = new File(dstFileName);
  80             if (!dstFile.exists()) {
  81                 EdkLog.log(this, EdkLog.EDK_VERBOSE, "Target file [" + dstFileName + "] doesn't exist!");
  82                 return true;
  83             }
  84
  85             long dstTimeStamp = dstFile.lastModified();
  86             Iterator srcIt = sources.nameList.iterator();
  87             while (srcIt.hasNext()) {
  88                 String srcFileName = (String)srcIt.next();
  89                 long srcTimeStamp;
  90
  91                 if (timeStampCache.containsKey(srcFileName)) {
  92                     srcTimeStamp = ((Long)timeStampCache.get(srcFileName)).longValue();
  93                 } else {
  94                     File srcFile = new File(srcFileName);
  95                     if (!srcFile.exists()) {
  96                         throw new BuildException("Source File name: " + srcFileName + " doesn't exist!!!");
  97                     }
  98                     srcTimeStamp = srcFile.lastModified();
  99                     timeStampCache.put(srcFileName, new Long(srcTimeStamp));
 100                 }
 101
 102                 if (dstTimeStamp < srcTimeStamp) {
 103                     EdkLog.log(this, EdkLog.EDK_VERBOSE, "Source file [" + srcFileName + "] has been changed since last build!");
 104                     return true;
 105                 }
 106             }
 107         }
 108
 109         return false;
 110     }
 111
 112     /**
 113      Add method of ANT task for nested element with Sequential type
 114
 115      @param     task    Sequential object which contains tasks for generating target files
 116      **/
 117     public void addSequential(Sequential task) {
 118         this.task = task;
 119     }
 120
 121     /**
 122      Add method of ANT task for nested element with DpFileList type
 123
 124      @param     sources DpFileList object which contains the list of source files
 125      **/
 126     public void addSourcefiles(DpFileList sources) {
 127         this.sources = sources;
 128     }
 129
 130     /**
 131      Add method of ANT task for nested element with DpFileList type
 132
 133      @param     targets DpFileList object which contains the list of target files
 134      **/
 135     public void addTargetfiles(DpFileList targets) {
 136         this.targets = targets;
 137     }
 138 }
 139