dev.jorel.commandapi.AbstractCommandAPICommand Maven / Gradle / Ivy
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* Copyright 2018, 2020 Jorel Ali (Skepter) - MIT License
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package dev.jorel.commandapi;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.function.Predicate;
import dev.jorel.commandapi.arguments.AbstractArgument;
import dev.jorel.commandapi.arguments.GreedyArgument;
import dev.jorel.commandapi.exceptions.GreedyArgumentException;
import dev.jorel.commandapi.exceptions.MissingCommandExecutorException;
import dev.jorel.commandapi.exceptions.OptionalArgumentException;
/**
* A builder used to create commands to be registered by the CommandAPI.
*
* @param The class extending this class, used as the return type for chain calls
* @param The implementation of AbstractArgument used by the class extending this class
* @param The CommandSender class used by the class extending this class
*/
public abstract class AbstractCommandAPICommand
/// @endcond
, Argument
/// @cond DOX
extends AbstractArgument
/// @endcond
, CommandSender> extends ExecutableCommand {
protected List arguments = new ArrayList<>();
protected List subcommands = new ArrayList<>();
protected boolean isConverted;
/**
* Creates a new command builder
*
* @param commandName The name of the command to create
*/
protected AbstractCommandAPICommand(String commandName) {
super(commandName);
this.isConverted = false;
}
/**
* Creates a new Command builder
*
* @param metaData The metadata of the command to create
*/
protected AbstractCommandAPICommand(CommandMetaData metaData) {
super(metaData);
this.isConverted = false;
}
/**
* Appends the arguments to the current command builder
*
* @param args A List that represents the arguments that this
* command can accept
* @return this command builder
*/
public Impl withArguments(List args) {
this.arguments.addAll(args);
return instance();
}
/**
* Appends the argument(s) to the current command builder
*
* @param args Arguments that this command can accept
* @return this command builder
*/
@SafeVarargs
public final Impl withArguments(Argument... args) {
this.arguments.addAll(Arrays.asList(args));
return instance();
}
/**
* Appends the optional arguments to the current command builder.
*
* This also calls {@link AbstractArgument#setOptional(boolean)} on each argument to make sure they are optional
*
* @param args A List that represents the arguments that this
* command can accept
* @return this command builder
*/
public Impl withOptionalArguments(List args) {
for (Argument argument : args) {
argument.setOptional(true);
this.arguments.add(argument);
}
return instance();
}
/**
* Appends the optional arguments to the current command builder.
*
* This also calls {@link AbstractArgument#setOptional(boolean)} on each argument to make sure they are optional
*
* @param args Arguments that this command can accept
* @return this command builder
*/
@SafeVarargs
public final Impl withOptionalArguments(Argument... args) {
for (Argument argument : args) {
argument.setOptional(true);
this.arguments.add(argument);
}
return instance();
}
/**
* Adds a subcommand to this command builder
*
* @param subcommand the subcommand to add as a child of this command
* @return this command builder
*/
public Impl withSubcommand(Impl subcommand) {
this.subcommands.add(subcommand);
return instance();
}
/**
* Adds subcommands to this command builder
*
* @param subcommands the subcommands to add as children of this command
* @return this command builder
*/
public Impl withSubcommands(@SuppressWarnings("unchecked") Impl... subcommands) {
this.subcommands.addAll(Arrays.asList(subcommands));
return instance();
}
/**
* Returns the list of arguments that this command has
*
* @return the list of arguments that this command has
*/
public List getArguments() {
return arguments;
}
/**
* Sets the arguments that this command has
*
* @param args the arguments that this command has
*/
public void setArguments(List args) {
this.arguments = args;
}
/**
* Returns the list of subcommands that this command has
*
* @return the list of subcommands that this command has
*/
public List getSubcommands() {
return subcommands;
}
/**
* Sets the list of subcommands that this command has
*
* @param subcommands the list of subcommands that this command has
*/
public void setSubcommands(List subcommands) {
this.subcommands = subcommands;
}
/**
* Returns whether this command is an automatically converted command
*
* @return whether this command is an automatically converted command
*/
public boolean isConverted() {
return isConverted;
}
/**
* Sets a command as "converted". This tells the CommandAPI that this command
* was converted by the CommandAPI's Converter. This should not be used outside
* of the CommandAPI's internal API
*
* @param isConverted whether this command is converted or not
* @return this command builder
*/
Impl setConverted(boolean isConverted) {
this.isConverted = isConverted;
return instance();
}
// Expands subcommands into arguments. This method should be static (it
// shouldn't be accessing/depending on any of the contents of the current class instance)
@SuppressWarnings({ "unchecked", "rawtypes" })
private static , Argument extends AbstractArgument, CommandSender>
void flatten(Impl rootCommand, List prevArguments, Impl subcommand, String namespace) {
// Get the list of literals represented by the current subcommand. This
// includes the subcommand's name and any aliases for this subcommand
String[] literals = new String[subcommand.meta.aliases.length + 1];
literals[0] = subcommand.meta.commandName;
System.arraycopy(subcommand.meta.aliases, 0, literals, 1, subcommand.meta.aliases.length);
// Create a MultiLiteralArgument using the subcommand information
Argument literal = (Argument) CommandAPIHandler.getInstance().getPlatform().newConcreteMultiLiteralArgument(subcommand.meta.commandName, literals);
literal.withPermission(subcommand.meta.permission)
.withRequirement((Predicate) subcommand.meta.requirements)
.setListed(false);
prevArguments.add(literal);
if (subcommand.executor.hasAnyExecutors()) {
// Create the new command. The new command:
// - starts at the root command node
// - has all of the previously declared arguments (i.e. not itself)
// - uses the subcommand's executor
// - has no subcommands(?)
// Honestly, if you're asking how or why any of this works, I don't
// know because I just trialled random code until it started working
rootCommand.arguments = prevArguments;
rootCommand.withArguments(subcommand.arguments);
rootCommand.executor = subcommand.executor;
rootCommand.subcommands = new ArrayList<>();
rootCommand.register(namespace);
}
for (Impl subsubcommand : subcommand.getSubcommands()) {
flatten(rootCommand, new ArrayList<>(prevArguments), subsubcommand, namespace);
}
}
boolean hasAnyExecutors() {
if (this.executor.hasAnyExecutors()) {
return true;
} else {
for(Impl subcommand : this.subcommands) {
if (subcommand.hasAnyExecutors()) {
return true;
}
}
}
return false;
}
private void checkHasExecutors() {
if(!hasAnyExecutors()) {
throw new MissingCommandExecutorException(this.meta.commandName);
}
}
/**
* Registers the command with a given namespace
*
* @param namespace The namespace of this command. This cannot be null
* @throws NullPointerException if the namespace is null
*/
@Override
public void register(String namespace) {
if (namespace == null) {
// Only reachable through Velocity
throw new NullPointerException("Parameter 'namespace' was null when registering command /" + this.meta.commandName + "!");
}
@SuppressWarnings("unchecked")
Argument[] argumentsArray = (Argument[]) (arguments == null ? new AbstractArgument[0] : arguments.toArray(AbstractArgument[]::new));
// Check GreedyArgument constraints
checkGreedyArgumentConstraints(argumentsArray);
checkHasExecutors();
// Assign the command's permissions to arguments if the arguments don't already
// have one
for (Argument argument : argumentsArray) {
if (argument.getArgumentPermission() == null) {
argument.withPermission(meta.permission);
}
}
if (executor.hasAnyExecutors()) {
// Need to cast handler to the right CommandSender type so that argumentsArray and executor are accepted
@SuppressWarnings("unchecked")
CommandAPIHandler handler = (CommandAPIHandler) CommandAPIHandler.getInstance();
// Create a List that is used to register optional arguments
for (Argument[] args : getArgumentsToRegister(argumentsArray)) {
handler.register(meta, args, executor, isConverted, namespace);
}
}
// Convert subcommands into multiliteral arguments
for (Impl subcommand : this.subcommands) {
flatten(this.copy(), new ArrayList<>(), subcommand, namespace);
}
}
// Checks that greedy arguments don't have any other arguments at the end,
// and only zero or one greedy argument is present in an array of arguments
private void checkGreedyArgumentConstraints(Argument[] argumentsArray) {
for (int i = 0; i < argumentsArray.length; i++) {
// If we've seen a greedy argument that isn't at the end, then that
// also covers the case of seeing more than one greedy argument, as
// if there are more than one greedy arguments, one of them must not
// be at the end!
if (argumentsArray[i] instanceof GreedyArgument && i != argumentsArray.length - 1) {
throw new GreedyArgumentException(argumentsArray);
}
}
}
public Impl copy() {
Impl command = newConcreteCommandAPICommand(new CommandMetaData<>(this.meta));
command.arguments = new ArrayList<>(this.arguments);
command.subcommands = new ArrayList<>(this.subcommands);
command.isConverted = this.isConverted;
return command;
}
protected abstract Impl newConcreteCommandAPICommand(CommandMetaData metaData);
private List getArgumentsToRegister(Argument[] argumentsArray) {
List argumentsToRegister = new ArrayList<>();
List currentCommand = new ArrayList<>();
Iterator argumentIterator = List.of(argumentsArray).iterator();
// Collect all required arguments, adding them as a command once finding the first optional
while(argumentIterator.hasNext()) {
Argument next = argumentIterator.next();
if(next.isOptional()) {
argumentsToRegister.add((Argument[]) currentCommand.toArray(new AbstractArgument[0]));
currentCommand.addAll(unpackCombinedArguments(next));
break;
}
currentCommand.addAll(unpackCombinedArguments(next));
}
// Collect the optional arguments, adding each one as a valid command
while (argumentIterator.hasNext()) {
Argument next = argumentIterator.next();
if(!next.isOptional()) {
throw new OptionalArgumentException(meta.commandName); // non-optional argument after optional
}
argumentsToRegister.add((Argument[]) currentCommand.toArray(new AbstractArgument[0]));
currentCommand.addAll(unpackCombinedArguments(next));
}
// All the arguments expanded, also handles when there are no optional arguments
argumentsToRegister.add((Argument[]) currentCommand.toArray(new AbstractArgument[0]));
return argumentsToRegister;
}
private List unpackCombinedArguments(Argument argument) {
if (!argument.hasCombinedArguments()) {
return List.of(argument);
}
List combinedArguments = new ArrayList<>();
combinedArguments.add(argument);
for (Argument subArgument : argument.getCombinedArguments()) {
subArgument.copyPermissionsAndRequirements(argument);
combinedArguments.addAll(unpackCombinedArguments(subArgument));
}
return combinedArguments;
}
}