Bukkit/src/main/java/org/bukkit/event/player/AsyncPlayerChatEvent.java

package org.bukkit.event.player;

import java.util.IllegalFormatException;
import java.util.Set;

import org.bukkit.entity.Player;
import org.bukkit.event.Cancellable;
import org.bukkit.event.HandlerList;

/**
 * This event will sometimes fire synchronously, depending on how it was triggered.
 * The constructor provides a boolean to indicate if the event was fired synchronously or asynchronously.
 * If a plugin causes a Player to chat with {@link Player#chat(String)} or by other general means, this event will be synchronous.<br>
 * <br>
 * <b>Care should be taken to check {@link #isAsynchronous()} and treat the event appropriately.</b>
 */
public class AsyncPlayerChatEvent extends PlayerEvent implements Cancellable {
    private static final HandlerList handlers = new HandlerList();
    private boolean cancel = false;
    private String message;
    private String format = "<%1$s> %2$s";
    private final Set<Player> recipients;

    /**
     *
     * @param async This changes the event to a synchronous state.
     * @param who the chat sender
     * @param message the message sent
     * @param players the players to receive the message. This may be a lazy or unmodifiable collection.
     */
    public AsyncPlayerChatEvent(final boolean async, final Player who, final String message, final Set<Player> players) {
        super(who, async);
        this.message = message;
        recipients = players;
    }

    /**
     * Gets the message that the player is attempting to send. This message will be used with {@link #getFormat()}.
     *
     * @return Message the player is attempting to send
     */
    public String getMessage() {
        return message;
    }

    /**
     * Sets the message that the player will send. This message will be used with {@link #getFormat()}.
     *
     * @param message New message that the player will send
     */
    public void setMessage(String message) {
        this.message = message;
    }

    /**
     * Gets the format to use to display this chat message.
     * When this event finishes execution, the first format parameter is the {@link Player#getDisplayName()} and the second parameter is {@link #getMessage()}
     *
     * @return {@link String#format(String, Object...)} compatible format string
     */
    public String getFormat() {
        return format;
    }

    /**
     * Sets the format to use to display this chat message.
     * When this event finishes execution, the first format parameter is the {@link Player#getDisplayName()} and the second parameter is {@link #getMessage()}
     *
     * @param format {@link String#format(String, Object...)} compatible format string
     * @throws IllegalFormatException if the underlying API throws the exception
     * @throws NullPointerException if format is null
     * @see String#format(String, Object...)
     */
    public void setFormat(final String format) throws IllegalFormatException, NullPointerException {
        // Oh for a better way to do this!
        try {
            String.format(format, player, message);
        } catch (RuntimeException ex) {
            ex.fillInStackTrace();
            throw ex;
        }

        this.format = format;
    }

    /**
     * Gets a set of recipients that this chat message will be displayed to.
     * The set returned is not guaranteed to be mutable and may auto-populate on access.
     * Any listener accessing the returned set should be aware that it may reduce performance for a lazy set implementation.<br>
     * <br>
     * <b>Listeners should be aware that modifying the list may throw {@link UnsupportedOperationException} if the event caller provides an unmodifiable set.</b>
     *
     * @return All Players who will see this chat message
     */
    public Set<Player> getRecipients() {
        return recipients;
    }

    public boolean isCancelled() {
        return cancel ;
    }

    public void setCancelled(boolean cancel) {
        this.cancel = cancel;
    }

    @Override
    public HandlerList getHandlers() {
        return handlers;
    }

    public static HandlerList getHandlerList() {
        return handlers;
    }
}