tim/prune/ExternalTools.java

   1 package tim.prune;
   2
   3 import java.io.IOException;
   4
   5 import tim.prune.config.Config;
   6
   7
   8 /**
   9  * Class to manage interfaces to external tools, like exiftool
  10  */
  11 public abstract class ExternalTools
  12 {
  13         /** Constant for Exiftool */
  14         public static final int TOOL_EXIFTOOL = 0;
  15         /** Constant for Gpsbabel */
  16         public static final int TOOL_GPSBABEL = 1;
  17         /** Constant for Gnuplot */
  18         public static final int TOOL_GNUPLOT  = 2;
  19         /** Constant for Xerces xml library */
  20         public static final int TOOL_XERCES   = 3;
  21         /** Config keys in order that the tools are defined above */
  22         private static final String[] CONFIG_KEYS = {Config.KEY_EXIFTOOL_PATH, Config.KEY_GPSBABEL_PATH, Config.KEY_GNUPLOT_PATH};
  23         /** Verification flags for the tools in the order defined above */
  24         private static final String[] VERIFY_FLAGS = {"-v", "-V", "-V"};
  25
  26
  27         /**
  28          * Check if the selected tool is installed
  29          * @param inToolNum number of tool, from constants
  30          * @return true if selected tool is installed
  31          */
  32         public static boolean isToolInstalled(int inToolNum)
  33         {
  34                 switch (inToolNum) {
  35                         case TOOL_EXIFTOOL:
  36                         case TOOL_GPSBABEL:
  37                         case TOOL_GNUPLOT:
  38                                 String toolPath = Config.getConfigString(CONFIG_KEYS[inToolNum]);
  39                                 if (toolPath != null && toolPath.length() > 0) {
  40                                         return check(toolPath + " " + VERIFY_FLAGS[inToolNum]);
  41                                 }
  42                                 break;
  43                         case TOOL_XERCES:
  44                                 try {
  45                                         return Class.forName("org.apache.xerces.parsers.SAXParser").getClassLoader() != null;
  46                                 }
  47                                 catch (ClassNotFoundException e) {
  48                                         // System.err.println(e.getClass().getName() + " : " + e.getMessage());
  49                                 }
  50                                 break;
  51                 }
  52                 // Not found
  53                 return false;
  54         }
  55
  56         /**
  57          * Check if the selected tool is installed using the given path
  58          * @param inToolNum number of tool, from constants
  59          * @param inPath selected path to use instead of configured one
  60          * @return true if selected tool is installed
  61          */
  62         public static boolean isToolInstalled(int inToolNum, String inPath)
  63         {
  64                 if (inPath == null || inPath.equals("")) {return false;}
  65                 switch (inToolNum) {
  66                         case TOOL_EXIFTOOL:
  67                         case TOOL_GPSBABEL:
  68                         case TOOL_GNUPLOT:
  69                                 return check(inPath + " " + VERIFY_FLAGS[inToolNum]);
  70                 }
  71                 // Not found
  72                 return false;
  73         }
  74
  75         /**
  76          * Attempt to call the specified command
  77          * @return true if found, false otherwise
  78          */
  79         private static boolean check(String inCommand)
  80         {
  81                 try
  82                 {
  83                         Runtime.getRuntime().exec(inCommand);
  84                         return true;
  85                 }
  86                 catch (IOException ioe)
  87                 {
  88                         // exception thrown, command not found
  89                         return false;
  90                 }
  91         }
  92 }