Implement TabCompleteEvent

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/event/server/TabCompleteEvent.java

@@ -0,0 +1,89 @@
+package org.bukkit.event.server;
+
+import java.util.List;
+import org.apache.commons.lang.Validate;
+import org.bukkit.command.CommandSender;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+
+/**
+ * Called when a {@link CommandSender} of any description (ie: player or
+ * console) attempts to tab complete.
+ */
+public class TabCompleteEvent extends Event implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+    //
+    private final CommandSender sender;
+    private final String buffer;
+    private List<String> completions;
+    private boolean cancelled;
+
+    public TabCompleteEvent(CommandSender sender, String buffer, List<String> completions) {
+        Validate.notNull(sender, "sender");
+        Validate.notNull(buffer, "buffer");
+        Validate.notNull(completions, "completions");
+
+        this.sender = sender;
+        this.buffer = buffer;
+        this.completions = completions;
+    }
+
+    /**
+     * Get the sender completing this command.
+     *
+     * @return the {@link CommandSender} instance
+     */
+    public CommandSender getSender() {
+        return sender;
+    }
+
+    /**
+     * Return the entire buffer which formed the basis of this completion.
+     *
+     * @return command buffer, as entered
+     */
+    public String getBuffer() {
+        return buffer;
+    }
+
+    /**
+     * The list of completions which will be offered to the sender, in order.
+     * This list is mutable and reflects what will be offered.
+     *
+     * @return a list of offered completions
+     */
+    public List<String> getCompletions() {
+        return completions;
+    }
+
+    /**
+     * Set the completions offered, overriding any already set.
+     *
+     * @param completions the new completions
+     */
+    public void setCompletions(List<String> completions) {
+        Validate.notNull(completions);
+        this.completions = completions;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancelled) {
+        this.cancelled = cancelled;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}