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184 lines (156 loc) · 6.24 KB
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package org.javawebstack.command;
import org.javawebstack.command.bind.AutoInjector;
import org.javawebstack.command.bind.CommandRouteBinder;
import org.javawebstack.command.bind.DefaultRouteAutoInjector;
import org.javawebstack.command.handler.*;
import org.javawebstack.command.io.DefaultInput;
import org.javawebstack.command.io.DefaultOutput;
import org.javawebstack.command.io.Input;
import org.javawebstack.command.io.Output;
import org.javawebstack.command.router.CommandRoute;
import org.javawebstack.command.router.CommandRouter;
import org.javawebstack.command.router.CommandRouterResult;
import org.javawebstack.command.router.CommandValidationException;
import org.javawebstack.command.util.SimpleCommandDeclaration;
import org.reflections.Reflections;
import java.util.*;
import java.util.function.Function;
public class CLI {
private final CommandRouter router = new CommandRouter();
private final Map<String, CommandHandler> beforeMiddleware = new HashMap<>();
private final Map<String, CommandHandler> afterMiddleware = new HashMap<>();
private final List<AutoInjector> autoInjectors = new ArrayList<>();
private final Map<String, Function<String, Object>> resolvers = new HashMap<>();
private ExceptionHandler exceptionHandler = new DefaultExceptionHandler();
private CommandNotFoundHandler notFoundHandler = new DefaultCommandNotFoundHandler();
private Function<Class<?>, Object> controllerInitiator = CLI::defaultControllerInitiator;
private final CommandRouteBinder routeBinder = new CommandRouteBinder(this);
public CLI() {
autoInjectors.add(new DefaultRouteAutoInjector());
}
public CLI route(CommandRoute route) {
router.add(route);
return this;
}
public CLI route(String declaration, CommandHandler handler, String... middlewares) {
SimpleCommandDeclaration decl = new SimpleCommandDeclaration();
decl.parse(declaration, false);
return route(decl, handler, middlewares);
}
public CLI route(SimpleCommandDeclaration declaration, CommandHandler handler, String... middlewares) {
CommandRoute route = declaration.create(getResolvers());
route.handler(handler);
for (String name : middlewares) {
CommandHandler before = getBeforeMiddleware(name);
CommandHandler after = getAfterMiddleware(name);
if (before == null && after == null) {
System.out.println("[WARN] Middleware \"" + name + "\" not found!");
continue;
}
if (before != null)
route.getBeforeMiddlewares().add(before);
if (after != null)
route.getAfterMiddlewares().add(after);
}
return route(route);
}
public CLI controller(Class<?> parentClass, Package p) {
return controller("", parentClass, p);
}
public CLI controller(String globalPrefix, Class<?> parentClass, Package p) {
Reflections reflections = new Reflections(p.getName());
reflections.getSubTypesOf(parentClass)
.stream()
.map(controllerInitiator)
.forEach(c -> controller(globalPrefix, c));
return this;
}
public CLI controller(Object controller) {
return controller("", controller);
}
public CLI controller(String globalPrefix, Object controller) {
routeBinder.bind(globalPrefix, controller);
return this;
}
public boolean execute(String[] args) {
return execute(args, new DefaultInput(), new DefaultOutput());
}
public boolean execute(String[] args, Input input, Output output) {
try {
CommandRouterResult result = router.match(args);
if(!result.isMatched()) {
notFoundHandler.handleNotFound(this, args, input, output);
return false;
}
CommandContext context = result.getContext();
context.setInput(input);
context.setOutput(output);
CommandRoute route = result.getRoute();
try {
return route.execute(context);
} catch (Exception ex) {
try {
exceptionHandler.handleException(context, ex);
} catch (Exception hex) {
if(output != null) {
output.error("Exception in ExceptionHandler");
output.error(hex);
}
}
return false;
}
} catch (CommandValidationException e) {
if(output != null)
output.error(e.getMessage());
return false;
}
}
public CLI notFound(CommandNotFoundHandler notFoundHandler) {
this.notFoundHandler = notFoundHandler;
return this;
}
public CLI exceptionHandler(ExceptionHandler exceptionHandler) {
this.exceptionHandler = exceptionHandler;
return this;
}
public CLI middleware(String name, CommandHandler handler) {
beforeMiddleware.put(name, handler);
return this;
}
public CLI afterMiddleware(String name, CommandHandler handler) {
afterMiddleware.put(name, handler);
return this;
}
public CommandHandler getBeforeMiddleware(String name) {
return beforeMiddleware.get(name);
}
public CommandHandler getAfterMiddleware(String name) {
return afterMiddleware.get(name);
}
public CLI autoInjector(AutoInjector injector) {
autoInjectors.add(injector);
return this;
}
public List<AutoInjector> getAutoInjectors() {
return autoInjectors;
}
public CLI resolver(String name, Function<String, Object> resolver) {
resolvers.put(name, resolver);
return this;
}
public Map<String, Function<String, Object>> getResolvers() {
return resolvers;
}
public CLI controllerInitiator(Function<Class<?>, Object> initiator) {
controllerInitiator = initiator;
return this;
}
private static Object defaultControllerInitiator(Class<?> clazz) {
try {
return clazz.newInstance();
} catch (InstantiationException | IllegalAccessException e) {
e.printStackTrace();
}
return null;
}
}