perf: Lazy load classes in type resolver

src/main/java/me/coley/recaf/parse/source/WorkspaceClassPath.java

@@ -0,0 +1,58 @@
+package me.coley.recaf.parse.source;
+
+import javassist.ClassPath;
+import me.coley.recaf.util.Log;
+import me.coley.recaf.workspace.Workspace;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.net.URL;
+import java.net.URLConnection;
+import java.net.URLStreamHandler;
+
+/**
+ * Javassist classpath implementation that pulls classes from a workspace.
+ *
+ * @author Matt Coley
+ */
+public class WorkspaceClassPath implements ClassPath {
+	private static final RecafStreamHandler dummyUrlHandler = new RecafStreamHandler();
+	private final Workspace workspace;
+
+	/**
+	 * @param workspace
+	 * 		Workspace to pull classes from.
+	 */
+	public WorkspaceClassPath(Workspace workspace) {
+		this.workspace = workspace;
+	}
+
+	@Override
+	public InputStream openClassfile(String classname) {
+		byte[] bytes = workspace.getRawClass(classname);
+		if (bytes != null)
+			return new ByteArrayInputStream(bytes);
+		return null;
+	}
+
+	@Override
+	public URL find(String classname) {
+		// Javassist does a URL lookup before allowing any actual reading, so we have to supply some
+		// dummy value in order to then call "openClassfile"
+		try {
+			String internalName = classname.replace('.', '/');
+			return new URL(null, "recaf:" + internalName, dummyUrlHandler);
+		} catch (Exception ex) {
+			Log.error("Failed to create 'recaf' URL scheme", ex);
+			return null;
+		}
+	}
+
+	private static class RecafStreamHandler extends URLStreamHandler {
+		@Override
+		protected URLConnection openConnection(URL u) {
+			// No-op
+			return null;
+		}
+	}
+}

src/main/java/me/coley/recaf/parse/source/WorkspaceTypeResolver.java

@@ -30,8 +30,7 @@ public class WorkspaceTypeResolver implements TypeSolver {
 	 */
 	public WorkspaceTypeResolver(Workspace workspace) {
 		this.workspace = workspace;
-		for (String name : workspace.getClassNames())
-			classPool.insertClassPath(new ByteArrayClassPath(name.replace("/", "."), workspace.getRawClass(name)));
+		classPool.appendClassPath(new WorkspaceClassPath(workspace));
 		classPool.appendSystemPath();
 	}