Paper Plugins

Co-authored-by: Micah Rao <micah.s.rao@gmail.com>

paper-server/src/main/java/io/papermc/paper/plugin/loader/PaperClasspathBuilder.java

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+package io.papermc.paper.plugin.loader;
+
+import io.papermc.paper.plugin.bootstrap.PluginProviderContext;
+import io.papermc.paper.plugin.loader.library.ClassPathLibrary;
+import io.papermc.paper.plugin.loader.library.PaperLibraryStore;
+import io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader;
+import io.papermc.paper.plugin.provider.configuration.PaperPluginMeta;
+import org.jetbrains.annotations.NotNull;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.jar.JarFile;
+import java.util.logging.Logger;
+
+public class PaperClasspathBuilder implements PluginClasspathBuilder {
+
+    private final List<ClassPathLibrary> libraries = new ArrayList<>();
+
+    private final PluginProviderContext context;
+
+    public PaperClasspathBuilder(PluginProviderContext context) {
+        this.context = context;
+    }
+
+    @Override
+    public @NotNull PluginProviderContext getContext() {
+        return this.context;
+    }
+
+    @Override
+    public @NotNull PluginClasspathBuilder addLibrary(@NotNull ClassPathLibrary classPathLibrary) {
+        this.libraries.add(classPathLibrary);
+        return this;
+    }
+
+    public PaperPluginClassLoader buildClassLoader(Logger logger, Path source, JarFile jarFile, PaperPluginMeta configuration) {
+        PaperLibraryStore paperLibraryStore = new PaperLibraryStore();
+        for (ClassPathLibrary library : this.libraries) {
+            library.register(paperLibraryStore);
+        }
+
+        List<Path> paths = paperLibraryStore.getPaths();
+        URL[] urls = new URL[paths.size()];
+        for (int i = 0; i < paths.size(); i++) {
+            Path path = paperLibraryStore.getPaths().get(i);
+            try {
+                urls[i] = path.toUri().toURL();
+            } catch (MalformedURLException e) {
+                throw new AssertionError(e);
+            }
+        }
+
+        try {
+            return new PaperPluginClassLoader(logger, source, jarFile, configuration, this.getClass().getClassLoader(), new URLClassLoader(urls, getClass().getClassLoader()));
+        } catch (IOException exception) {
+            throw new RuntimeException(exception);
+        }
+    }
+}

paper-server/src/main/java/io/papermc/paper/plugin/loader/library/PaperLibraryStore.java

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+package io.papermc.paper.plugin.loader.library;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+
+public class PaperLibraryStore implements LibraryStore {
+
+    private final List<Path> paths = new ArrayList<>();
+
+    @Override
+    public void addLibrary(@NotNull Path library) {
+        this.paths.add(library);
+    }
+
+    public List<Path> getPaths() {
+        return this.paths;
+    }
+}