work on addon bootstrapping

common/api/addons/build.gradle.kts

@@ -0,0 +1,3 @@
+dependencies {
+    "shadedApi"(project(":common:api:util"))
+}

common/api/addons/src/main/java/com/dfsek/terra/api/addon/AddonEntryPoint.java

@@ -0,0 +1,7 @@
+package com.dfsek.terra.api.addon;
+
+import com.dfsek.terra.api.util.StringIdentifiable;
+
+
+public interface AddonEntryPoint extends StringIdentifiable {
+}

common/api/addons/src/main/java/com/dfsek/terra/api/addon/bootstrap/BootstrapAddon.java

@@ -0,0 +1,16 @@
+package com.dfsek.terra.api.addon.bootstrap;
+
+import com.dfsek.terra.api.addon.AddonEntryPoint;
+
+import java.nio.file.Path;
+
+
+public interface BootstrapAddon extends AddonEntryPoint {
+    /**
+     * Load all the relevant addons in the specified path.
+     * @param addonsFolder Path containing addons.
+     * @param parent
+     * @return Loaded addons
+     */
+    Iterable<AddonEntryPoint> loadAddons(Path addonsFolder, ClassLoader parent);
+}

common/api/config/build.gradle.kts

@@ -1,10 +0,0 @@
-dependencies {
-    "shadedApi"(project(":common:api:core"))
-    
-    "shadedApi"("com.dfsek:Paralithic:0.5.0")
-    
-    "shadedApi"("com.dfsek.tectonic:common:2.1.2")
-    
-    "shadedApi"("net.jafama:jafama:2.3.2")
-}
-

common/loader/addon/src/main/java/com/dfsek/terra/addon/AddonClassLoader.java

@@ -23,10 +23,6 @@ public class AddonClassLoader extends URLClassLoader {
         super(urls, parent);
     }
     
-    public AddonClassLoader(URL[] urls) {
-        super(urls);
-    }
-    
     @SuppressWarnings("unchecked")
     public static Set<Class<? extends TerraAddon>> fetchAddonClasses(File file, ClassLoader parent) throws IOException {
         JarFile jarFile = new JarFile(file);

common/loader/addon/src/main/java/com/dfsek/terra/addon/BootstrapAddonLoader.java

@@ -0,0 +1,58 @@
+package com.dfsek.terra.addon;
+
+import com.dfsek.terra.addon.exception.AddonLoadException;
+import com.dfsek.terra.api.addon.AddonEntryPoint;
+import com.dfsek.terra.api.addon.bootstrap.BootstrapAddon;
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.lang.reflect.InvocationTargetException;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.jar.JarFile;
+import java.util.stream.Collectors;
+
+
+public class BootstrapAddonLoader implements BootstrapAddon {
+    @Override
+    public Iterable<AddonEntryPoint> loadAddons(Path addonsFolder, ClassLoader parent) {
+        Path bootstrapAddons = addonsFolder.resolve("bootstrap");
+        
+        try {
+            return Files.walk(bootstrapAddons, 1)
+                        .filter(path -> path.toFile().isFile() && path.getFileName().endsWith(".jar"))
+                        .map(path -> {
+                            try {
+                                JarFile jar = new JarFile(path.toFile());
+                                String entry = jar.getManifest().getMainAttributes().getValue("Bootstrap-Addon-Entry-Point");
+                                AddonClassLoader loader = new AddonClassLoader(new URL[] {path.toUri().toURL()}, parent);
+    
+                                try {
+                                    Object in = loader.loadClass(entry).getConstructor().newInstance();
+                                    if(!(in instanceof AddonEntryPoint)) {
+                                        throw new AddonLoadException(in.getClass() + " does not extend " + AddonEntryPoint.class);
+                                    }
+                                    return (AddonEntryPoint) in;
+                                } catch(InvocationTargetException e) {
+                                    throw new AddonLoadException("Exception occurred while instantiating addon: ", e);
+                                } catch(NoSuchMethodException | IllegalAccessException | InstantiationException e) {
+                                    throw new AddonLoadException("No valid default constructor found in entry point " + entry);
+                                } catch(ClassNotFoundException e) {
+                                    throw new AddonLoadException("Entry point " + entry + " not found in JAR.");
+                                }
+    
+                            } catch(IOException e) {
+                                throw new UncheckedIOException(e);
+                            }
+                        }).collect(Collectors.toList());
+        } catch(IOException e) {
+            throw new UncheckedIOException(e);
+        }
+    }
+    
+    @Override
+    public String getID() {
+        return "BOOTSTRAP";
+    }
+}

common/loader/addon/src/main/java/com/dfsek/terra/addon/exception/AddonLoadException.java

@@ -1,6 +1,6 @@
 package com.dfsek.terra.addon.exception;
 
-public class AddonLoadException extends Exception {
+public class AddonLoadException extends RuntimeException {
     private static final long serialVersionUID = -4949084729296580176L;
     
     public AddonLoadException(String message) {