buildSrc/src/main/java/cc/squirreljme/plugin/util/SingleTaskOutputFile.java

   1 // -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
   2 // ---------------------------------------------------------------------------
   3 // SquirrelJME
   4 //     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
   5 // ---------------------------------------------------------------------------
   6 // SquirrelJME is under the GNU General Public License v3+, or later.
   7 // See license.mkd for licensing and copyright information.
   8 // ---------------------------------------------------------------------------
   9
  10 package cc.squirreljme.plugin.util;
  11
  12 import java.nio.file.Path;
  13 import java.util.concurrent.Callable;
  14 import org.gradle.api.Task;
  15 import org.gradle.api.file.FileCollection;
  16
  17 /**
  18  * This takes the output of a task and provides a {@link Callable} so that
  19  * it produces that single file.
  20  *
  21  * @since 2020/09/06
  22  */
  23 public class SingleTaskOutputFile
  24         implements Callable<Path>
  25 {
  26         /** The task to get. */
  27         protected final Task task;
  28
  29         /**
  30          * Initializes the utility.
  31          *
  32          * @param __task The task to extract from.
  33          * @throws NullPointerException On null arguments.
  34          * @since 2020/09/06
  35          */
  36         public SingleTaskOutputFile(Task __task)
  37                 throws NullPointerException
  38         {
  39                 if (__task == null)
  40                         throw new NullPointerException("NARG");
  41
  42                 this.task = __task;
  43         }
  44
  45         /**
  46          * {@inheritDoc}
  47          * @since 2020/09/06
  48          */
  49         @Override
  50         public Path call()
  51         {
  52                 FileCollection files = this.task.getOutputs().getFiles();
  53
  54                 if (files.getFiles().isEmpty())
  55                         return null;
  56
  57                 return files.getSingleFile().toPath();
  58         }
  59 }