JAL-2937 extract reusable utility method

diff --git a/src/jalview/util/FileUtils.java b/src/jalview/util/FileUtils.java
new file mode 100644 (file)
index 0000000..b81ec71
--- /dev/null
+++ b/src/jalview/util/FileUtils.java
@@ -0,0 +1,56 @@
+package jalview.util;
+
+import java.io.File;
+import java.io.IOException;
+
+/**
+ * Miscellaneous file-related functions
+ */
+public final class FileUtils
+{
+
+  /**
+   * Answers the executable file for the given command, or null if not found or
+   * not executable. The path to the executable is the command name prefixed by
+   * the given folder path, optionally with .exe appended.
+   * 
+   * @param cmd
+   *          command short name, for example hmmbuild
+   * @param binaryPath
+   *          parent folder for the executable
+   * @return
+   */
+  public static File getExecutable(String cmd, String binaryPath)
+  {
+    File file = new File(binaryPath, cmd);
+    if (!file.canExecute())
+    {
+      file = new File(binaryPath, cmd + ".exe");
+      {
+        if (!file.canExecute())
+        {
+          file = null;
+        }
+      }
+    }
+    return file;
+  }
+
+  /**
+   * A convenience method to create a temporary file that is deleted on exit of
+   * the JVM
+   * 
+   * @param prefix
+   * @param suffix
+   * @return
+   * @throws IOException
+   */
+  public static File createTempFile(String prefix, String suffix)
+          throws IOException
+  {
+    File f = File.createTempFile(prefix, suffix);
+    f.deleteOnExit();
+    return f;
+  }
+
+}