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A plugin API for Minecraft: Java Edition
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/*
* This file is part of SpongeAPI, licensed under the MIT License (MIT).
*
* Copyright (c) SpongePowered
* Copyright (c) contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.spongepowered.api.command.parameter;
import net.kyori.adventure.audience.Audience;
import net.kyori.adventure.identity.Identified;
import net.kyori.adventure.identity.Identity;
import net.kyori.adventure.text.Component;
import org.spongepowered.api.command.Command;
import org.spongepowered.api.command.CommandCause;
import org.spongepowered.api.command.parameter.managed.Flag;
import org.spongepowered.api.service.permission.SubjectProxy;
import java.util.Collection;
import java.util.NoSuchElementException;
import java.util.Optional;
/**
* The {@link CommandContext} contains the parsed arguments for a command, and
* any other information that might be important when executing a command.
*
* For information about the cause of the command, the {@link CommandCause}
* is available (see {@link #cause()}. Some popular tasks that operate
* on the {@link CommandCause} are also directly available on this context,
* namely permission checks (via {@link SubjectProxy}) and sending a message to
* the {@link CommandCause}'s {@link Audience} (via {@link #sendMessage}).
*/
public interface CommandContext extends SubjectProxy {
/**
* Gets the {@link Command.Parameterized} that is being executed, if it
* exists.
*
* @return The {@link Command.Parameterized}.
*/
Optional executedCommand();
/**
* Gets the {@link CommandCause} associated with this context.
*
* @return The {@link CommandCause}
*/
CommandCause cause();
/**
* Gets if a flag with given alias was specified at least once.
*
* If the flag has multiple aliases, (for example, {@code -f} and
* {@code --flag}, passing {@code f} or {@code flag} to this method will
* return the same result, regardless of the alias specified by the user.
*
*
* @param flagAlias The flag's alias (without a prefixed dash)
* @return If the flag was specified
*/
boolean hasFlag(String flagAlias);
/**
* Gets if the given flag was specified once.
*
* @param flag The {@link Flag}
* @return If the flag was specified
*/
boolean hasFlag(Flag flag);
/**
* Returns how many times a given flag was invoked for this command.
*
* If the flag has multiple aliases, (for example, {@code -f} and
* {@code --flag}, passing {@code f} or {@code flag} to this method will
* return the same result, regardless of the alias specified by the user.
*
*
* @param flagKey The flag's alias (without a prefixed dash)
* @return The number of times the flag was specified
*/
int flagInvocationCount(String flagKey);
/**
* Returns how many times a given {@link Flag} was invoked for this command.
*
* @param flag The {@link Flag}
* @return The number of times the flag was specified
*/
int flagInvocationCount(Flag flag);
/**
* Returns whether this context has any value for the given argument key.
*
* @param parameter the {@link Parameter} associated with the argument
* @return whether there are any values present
*/
boolean hasAny(final Parameter.Value parameter);
/**
* Returns whether this context has any value for the given argument key.
*
* @param key The key to look up
* @return whether there are any values present
*/
boolean hasAny(Parameter.Key key);
/**
* Gets the value for the given key if the key has only one value.
*
* @param parameter the {@link Parameter} associated with the argument
* @param the expected type of the argument
* @return the argument
* @throws IllegalArgumentException if more than one value for the key was
* found
*/
Optional one(final Parameter.Value parameter) throws IllegalArgumentException;
/**
* Gets the value for the given key if the key has only one value.
*
* @param key the key to get
* @param the expected type of the argument
* @return the argument
* @throws IllegalArgumentException if more than one value for the key was
* found
*/
Optional one(Parameter.Key key) throws IllegalArgumentException;
/**
* Gets the value for the given key if the key has only one value,
* otherwise, throws a {@link NoSuchElementException}.
*
* @param parameter the {@link Parameter} associated with the argument
* @param the expected type of the argument
* @return the argument
* @throws NoSuchElementException if no value for the key was found
* @throws IllegalArgumentException if more than one value for the key was
* found
*/
T requireOne(final Parameter.Value parameter) throws NoSuchElementException, IllegalArgumentException;
/**
* Gets the value for the given key if the key has only one value,
* otherwise, throws a {@link NoSuchElementException}.
*
* @param key the key to get
* @param the expected type of the argument
* @return the argument
* @throws NoSuchElementException if no value for the key was found
* @throws IllegalArgumentException if more than one value for the key was
* found
*/
T requireOne(Parameter.Key key) throws NoSuchElementException, IllegalArgumentException;
/**
* Gets all values for the given argument. May return an empty list if no
* values are present.
*
* @param parameter the {@link Parameter} associated with the argument
* @param the expected type of the argument
* @return the argument
*/
Collection all(final Parameter.Value parameter);
/**
* Gets all values for the given argument. May return an empty list if no
* values are present.
*
* @param key The key to get values for
* @param the type of value to get
* @return the collection of all values
*/
Collection all(Parameter.Key key);
/**
* Sends a message via {@link CommandCause#audience()}
*
* @see Audience#sendMessage(Identified, Component)
*
* @param source The {@link Identified} that is the sender of the message
* @param message The message to send
*/
void sendMessage(Identified source, Component message);
/**
* Sends a message via {@link CommandCause#audience()}
*
* @see Audience#sendMessage(Identity, Component)
*
* @param source The {@link Identity} of the sender of the message
* @param message The message to send
*/
void sendMessage(Identity source, Component message);
/**
* A builder for creating this context.
*/
interface Builder extends CommandContext {
/**
* Adds a flag invocation to the context.
*
* @param flag The flag to add the invocation for.
*/
void addFlagInvocation(Flag flag);
/**
* Adds a parsed object into the context, for use by commands.
*
* @param The type of parameter key
* @param parameter The key to store the entry under.
* @param value The collection of objects to store.
*/
default void putEntry(final Parameter.Value parameter, final T value) {
this.putEntry(parameter.key(), value);
}
/**
* Adds a collection of parsed objects into the context, for use by commands.
*
* @param The type of parameter key
* @param parameter The key to store the entry under.
* @param value The collection of objects to store.
*/
default void putEntries(final Parameter.Value parameter, final Collection value) {
value.forEach(val -> this.putEntry(parameter, val));
}
/**
* Adds a collection of parsed objects into the context, for use by commands.
*
* @param The type of parameter key
* @param parameter The key to store the entry under.
* @param value The collection of objects to store.
*/
default void putEntries(final Parameter.Key parameter, final Collection value) {
value.forEach(val -> this.putEntry(parameter, val));
}
/**
* Adds a parsed object into the context, for use by commands.
*
* @param The type of parameter key
* @param key The key to store the entry under.
* @param object The object to store.
*/
void putEntry(Parameter.Key key, T object);
/**
* Starts a {@link Transaction} which allows for this builder to be
* returned to a previous state if necessary.
*
* Multiple transactions can be started on the same builder, however,
* they must be either {@link #commit(Transaction) committed} or
* {@link #rollback(Transaction) rolledback} in reverse order (that is,
* the last transaction must be committed first)
*
* Transactions must not be held on to for longer than necessary.
*
* @return The state.
*/
Transaction startTransaction();
/**
* Creates a {@link CommandContext}.
*
* If {@link Transaction}s are still open at this point, they will all
* be {@link #commit(Transaction) committed}.
*
* @param input The input argument string.
* @return The context
*/
CommandContext build(String input);
/**
* Commits the specified {@link Transaction} if it was the most recently
* created transaction.
*
* @param transaction The transaction to commit.
* @throws IllegalArgumentException Thrown if there are newer
* transactions to commit first, if this transaction is not active, or
* if this transaction is not part of this builder.
*/
void commit(Transaction transaction) throws IllegalArgumentException;
/**
* Cancels the specified {@link Transaction} if it was the most recently
* created transaction.
*
* @param transaction The transaction to rollback.
* @throws IllegalArgumentException Thrown if there are newer
* transactions to commit first, if this transaction is not active, or
* if this transaction is not part of this builder.
*/
void rollback(Transaction transaction) throws IllegalArgumentException;
/**
* A transaction on a context builder.
*/
interface Transaction { }
}
}