From 4cf793b64eaac4c73499c74855c8c5b2a827a81f Mon Sep 17 00:00:00 2001
From: Laurent SCHOELENS <61973605+laurentschoelens@users.noreply.github.com>
Date: Thu, 15 Feb 2024 15:32:29 +0100
Subject: [PATCH] [#502] : delete episodeFile if only file generated in
 configuration phase of m2e (tested in eclipse)

---
 .../org/jvnet/jaxb/maven/RawXJC2Mojo.java     | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/maven-plugin/plugin-core/src/main/java/org/jvnet/jaxb/maven/RawXJC2Mojo.java b/maven-plugin/plugin-core/src/main/java/org/jvnet/jaxb/maven/RawXJC2Mojo.java
index de2dbe3bd..3cd54ae49 100644
--- a/maven-plugin/plugin-core/src/main/java/org/jvnet/jaxb/maven/RawXJC2Mojo.java
+++ b/maven-plugin/plugin-core/src/main/java/org/jvnet/jaxb/maven/RawXJC2Mojo.java
@@ -60,6 +60,7 @@
 import org.apache.maven.project.artifact.InvalidDependencyVersionException;
 import org.apache.maven.settings.Proxy;
 import org.apache.maven.settings.Settings;
+import org.codehaus.plexus.util.DirectoryScanner;
 import org.codehaus.plexus.util.FileUtils;
 import org.codehaus.plexus.util.IOUtil;
 import org.jvnet.jaxb.maven.net.CompositeURILastModifiedResolver;
@@ -75,6 +76,7 @@
 import org.jvnet.jaxb.maven.util.LocaleUtils;
 import org.jvnet.jaxb.maven.util.CollectionUtils.Function;
 import org.sonatype.plexus.build.incremental.BuildContext;
+import org.sonatype.plexus.build.incremental.EmptyScanner;
 import org.xml.sax.EntityResolver;
 import org.xml.sax.InputSource;
 import org.xml.sax.SAXException;
@@ -479,6 +481,7 @@ protected void doExecute() throws MojoExecutionException {
 			setupDirectories();
 			doExecute(options);
 			addIfExistsToEpisodeSchemaBindings();
+            deleteEpisodeIfOnlyFileOnEmptyContext();
 			final BuildContext buildContext = getBuildContext();
 			getLog().debug(MessageFormat.format("Refreshing the generated directory [{0}].",
 					getGenerateDirectory().getAbsolutePath()));
@@ -577,6 +580,33 @@ private void addIfExistsToEpisodeSchemaBindings() throws MojoExecutionException
 		}
 	}
 
+    private void deleteEpisodeIfOnlyFileOnEmptyContext() {
+        if (!getEpisode() || getBuildContext() == null) {
+            return;
+        }
+        final File episodeFile = getEpisodeFile();
+        if (getBuildContext().isIncremental() && getBuildContext().newScanner(getGenerateDirectory()) instanceof EmptyScanner) {
+            if (!episodeFile.canWrite()) {
+                getLog().warn(MessageFormat
+                    .format("Episode file [{0}] is not writable, could not delete on incremental empty build.", episodeFile));
+                return;
+            }
+            DirectoryScanner directoryScanner = new DirectoryScanner();
+            directoryScanner.setBasedir(getGenerateDirectory());
+            directoryScanner.setIncludes(getProduces());
+            directoryScanner.scan();
+
+            if (directoryScanner.getIncludedFiles() != null && directoryScanner.getIncludedFiles().length == 1) {
+                String fileFound = directoryScanner.getIncludedFiles()[0];
+                if (new File(directoryScanner.getBasedir(), fileFound).equals(episodeFile)) {
+                    getLog().info(MessageFormat
+                        .format("directoryScanner got only one file [{0}] which is episodeFile - deleting since running in m2e context.", fileFound, episodeFile));
+                    episodeFile.delete();
+                }
+            }
+        }
+    }
+
 	private URILastModifiedResolver uriLastModifiedResolver;
 
 	private void setupURILastModifiedResolver() {