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import org.spongepowered.api.Sponge;
import org.spongepowered.api.text.Text;
import org.spongepowered.api.entity.living.player.Player;
import org.spongepowered.api.command.CommandException;
import org.spongepowered.api.command.CommandResult;
import org.spongepowered.api.command.CommandSource;
import org.spongepowered.api.command.args.CommandContext;
import org.spongepowered.api.command.args.GenericArguments;
import org.spongepowered.api.command.spec.CommandExecutor;
import org.spongepowered.api.command.spec.CommandSpec;

PluginContainer plugin = ...;

CommandSpec myCommandSpec = CommandSpec.builder()
        .description(Text.of("Send a message to a player"))
        .permission("myplugin.command.message")

        .arguments(
                GenericArguments.onlyOne(GenericArguments.player(Text.of("player"))),
                GenericArguments.remainingJoinedStrings(Text.of("message")))

        .executor((CommandSource src, CommandContext args) -> {

            Player player = args.<Player>getOne("player").get();
            String message = args.<String>getOne("message").get();

            player.sendMessage(Text.of(message));

            return CommandResult.success();
        })
        .build();

Sponge.getCommandManager().register(plugin, myCommandSpec, "message", "msg", "m");

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Warning

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import com.flowpowered.math.vector.Vector2i;
import org.spongepowered.api.command.args.ArgumentParseException;
import org.spongepowered.api.command.args.CommandArgs;
import org.spongepowered.api.text.Text;
import org.spongepowered.api.command.args.CommandElement;

import java.util.Collections;
import java.util.List;

public class Vector2iCommandElement extends CommandElement {

    protected Vector2iCommandElement(Text key) {
        super(key);
    }

    @Override
    protected Object parseValue(CommandSource source, CommandArgs args) throws ArgumentParseException {

        String xInput = args.next();
        int x = parseInt(xInput, args);

        String yInput = args.next();
        int y = parseInt(yInput, args);

        return new Vector2i(x, y);
    }

    private int parseInt(String input, CommandArgs args) throws ArgumentParseException {
        try {
            return Integer.parseInt(input);
        } catch(NumberFormatException e) {
            throw args.createError(Text.of("'" + input + "' is not a valid number!"));
        }
    }

    @Override
    public List<String> complete(CommandSource src, CommandArgs args, CommandContext context) {
        return Collections.emptyList();
    }

    @Override
    public Text getUsage(CommandSource src) {
        return Text.of("<x> <y>");
    }
}

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// /plottp <x> <y>
CommandSpec myCommandSpec = CommandSpec.builder()
        .description(Text.of("Teleport to a plot"))
        .permission("myplugin.command.plot.tp")

        .arguments(new Vector2iCommandElement(Text.of("coordinates")))

        .executor(new MyCommandExecutor())
        .build();

Tip

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@Override
protected Object parseValue(CommandSource source, CommandArgs args) throws ArgumentParseException {
    String nextArg = args.next();
    if (nextArg.startsWith("@")) {
        Set<Entity> selectedEntities;
        try {
            selectedEntities = Selector.parse(nextArg).resolve(source);
        } catch (IllegalArgumentException e) {
            throw args.createError(Text.of("Could not parse selector."));
        }

        if (selectedEntities.isEmpty()) {
            throw args.createError(Text.of("No entities selected."));
        }

        return selectedEntities;
    }

    throw args.createError(Text.of("Not a selector."));
}

Tip

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