X-Git-Url: https://git.pterodactylus.net/?p=jSite.git;a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Ftodesbaum%2Fjsite%2Fmain%2FJarFileLocator.java;fp=src%2Fmain%2Fjava%2Fde%2Ftodesbaum%2Fjsite%2Fmain%2FJarFileLocator.java;h=da2e766da6200a384cc1c0c8fc284b2e15de1b51;hp=0000000000000000000000000000000000000000;hb=364353eaf23d55c9302d4f736c685d6b9fa59dcb;hpb=fd3bd2c16b6d9d617bb70478c11ac756a726999f

diff --git a/src/main/java/de/todesbaum/jsite/main/JarFileLocator.java b/src/main/java/de/todesbaum/jsite/main/JarFileLocator.java
new file mode 100644
index 0000000..da2e766
--- /dev/null
+++ b/src/main/java/de/todesbaum/jsite/main/JarFileLocator.java
@@ -0,0 +1,45 @@
+package de.todesbaum.jsite.main;
+
+import static java.util.Optional.empty;
+
+import java.io.File;
+import java.io.UnsupportedEncodingException;
+import java.net.URL;
+import java.net.URLDecoder;
+import java.util.Optional;
+
+/**
+ * Locates the JAR file used to load jSite in the filesystem.
+ */
+public interface JarFileLocator {
+
+	Optional<File> locateJarFile();
+
+	class DefaultJarFileLocator implements JarFileLocator {
+
+		private final ClassLoader classLoader;
+
+		public DefaultJarFileLocator(ClassLoader classLoader) {
+			this.classLoader = classLoader;
+		}
+
+		@Override
+		public Optional<File> locateJarFile() {
+			URL resourceUrl = classLoader.getResource(Main.class.getName().replace(".", "/") + ".class");
+			if (resourceUrl == null) {
+				return empty();
+			}
+			String resource = resourceUrl.toString();
+			if (resource.startsWith("jar:")) {
+				try {
+					String jarFileLocation = URLDecoder.decode(resource.substring(9, resource.indexOf(".jar!") + 4), "UTF-8");
+					return Optional.of(new File(jarFileLocation));
+				} catch (UnsupportedEncodingException e) {
+					/* location is not available, ignore. */
+				}
+			}
+			return empty();
+		}
+	}
+
+}