123 lines
5.5 KiB
Java
123 lines
5.5 KiB
Java
//
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// MIT License
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//
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// Copyright (c) 2020 Alexander Söderberg & Contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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package cloud.commandframework.annotations;
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import cloud.commandframework.annotations.injection.ParameterInjector;
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import cloud.commandframework.annotations.injection.ParameterInjectorRegistry;
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import cloud.commandframework.arguments.CommandArgument;
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import cloud.commandframework.arguments.flags.FlagContext;
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import cloud.commandframework.context.CommandContext;
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import cloud.commandframework.execution.CommandExecutionHandler;
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import org.checkerframework.checker.nullness.qual.NonNull;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.reflect.Method;
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import java.lang.reflect.Parameter;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.List;
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import java.util.Map;
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class MethodCommandExecutionHandler<C> implements CommandExecutionHandler<C> {
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private final Parameter[] parameters;
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private final MethodHandle methodHandle;
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private final Map<String, CommandArgument<C, ?>> commandArguments;
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private final ParameterInjectorRegistry<C> injectorRegistry;
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private final AnnotationAccessor annotationAccessor;
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MethodCommandExecutionHandler(
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final @NonNull Object instance,
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final @NonNull Map<@NonNull String, @NonNull CommandArgument<@NonNull C, @NonNull ?>> commandArguments,
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final @NonNull Method method,
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final @NonNull ParameterInjectorRegistry<C> injectorRegistry
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) throws Exception {
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this.commandArguments = commandArguments;
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method.setAccessible(true);
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this.methodHandle = MethodHandles.lookup().unreflect(method).bindTo(instance);
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this.parameters = method.getParameters();
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this.injectorRegistry = injectorRegistry;
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this.annotationAccessor = AnnotationAccessor.of(method);
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}
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@Override
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public void execute(final @NonNull CommandContext<C> commandContext) {
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final List<Object> arguments = new ArrayList<>(this.parameters.length);
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final FlagContext flagContext = commandContext.flags();
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/* Bind parameters to context */
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for (final Parameter parameter : this.parameters) {
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if (parameter.isAnnotationPresent(Argument.class)) {
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final Argument argument = parameter.getAnnotation(Argument.class);
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final CommandArgument<C, ?> commandArgument = this.commandArguments.get(argument.value());
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if (commandArgument.isRequired()) {
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arguments.add(commandContext.get(argument.value()));
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} else {
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final Object optional = commandContext.getOptional(argument.value()).orElse(null);
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arguments.add(optional);
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}
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} else if (parameter.isAnnotationPresent(Flag.class)) {
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final Flag flag = parameter.getAnnotation(Flag.class);
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if (parameter.getType() == boolean.class) {
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arguments.add(flagContext.isPresent(flag.value()));
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} else {
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arguments.add(flagContext.getValue(flag.value(), null));
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}
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} else {
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if (parameter.getType().isAssignableFrom(commandContext.getSender().getClass())) {
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arguments.add(commandContext.getSender());
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} else {
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final Collection<ParameterInjector<C, ?>> injectors = this.injectorRegistry.injectors(parameter.getType());
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Object value = null;
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for (final ParameterInjector<C, ?> injector : injectors) {
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value = injector.create(
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commandContext,
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this.annotationAccessor
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);
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if (value != null) {
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break;
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}
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}
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if (value != null) {
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arguments.add(value);
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} else {
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throw new IllegalArgumentException(String.format(
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"Unknown command parameter '%s' in method '%s'",
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parameter.getName(), this.methodHandle.toString()
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));
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}
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}
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}
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}
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/* Invoke the command method */
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try {
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this.methodHandle.invokeWithArguments(arguments);
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} catch (final Throwable e) {
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e.printStackTrace();
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}
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}
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}
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