/*
* Copyright (c) 2013 Christopher Thunes
*
* 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 com.brewtab.irc.messages.filter;
import java.util.concurrent.atomic.AtomicBoolean;
import com.brewtab.irc.User;
import com.brewtab.irc.messages.Message;
import com.brewtab.irc.messages.MessageType;
/**
* Provides convenient filters
*
* @author Christopher Thunes <cthunes@brewtab.com>
*/
public class MessageFilters {
/** A filter that matches any message */
private static final MessageFilter PASS = new MessageFilter() {
@Override
public boolean check(Message message) {
return true;
}
};
public static MessageFilter pass() {
return PASS;
}
public static MessageFilter all(final MessageFilter... filters) {
return new MessageFilter() {
@Override
public boolean check(Message message) {
for (MessageFilter filter : filters) {
if (!filter.check(message)) {
return false;
}
}
return true;
}
};
}
public static MessageFilter any(final MessageFilter... filters) {
return new MessageFilter() {
@Override
public boolean check(Message message) {
for (MessageFilter filter : filters) {
if (filter.check(message)) {
return true;
}
}
return false;
}
};
}
public static MessageFilter not(final MessageFilter filter) {
return new MessageFilter() {
@Override
public boolean check(Message message) {
return !filter.check(message);
}
};
}
public static MessageFilter none(MessageFilter... filters) {
return not(any(filters));
}
public static MessageFilter prefix(final User user) {
return new MessageFilter() {
@Override
public boolean check(Message message) {
User other = User.fromPrefix(message.getPrefix());
if (other == null) {
return false;
}
if (user == null) {
return true;
}
String nick = user.getNick();
if (nick != null && !nick.equals(other.getNick())) {
return false;
}
String username = user.getUser();
if (username != null && !username.equals(other.getUser())) {
return false;
}
String host = user.getHost();
if (host != null && !host.equals(other.getHost())) {
return false;
}
return true;
}
};
}
public static MessageFilter prefix(final String prefix) {
return new MessageFilter() {
@Override
public boolean check(Message message) {
return prefix.equals(message.getPrefix());
}
};
}
public static MessageFilter message(final MessageType type, final String... args) {
return new MessageFilter() {
@Override
public boolean check(Message message) {
if (type != null && type != message.getType()) {
return false;
}
if (message.getArgs().length < args.length) {
return false;
}
int i = 0;
for (String arg : args) {
if (arg != null && !arg.equals(message.getArgs()[i])) {
return false;
}
i++;
}
return true;
}
};
}
public static MessageFilter range(final MessageFilter match, final MessageFilter last) {
return new MessageFilter() {
private boolean ended = false;
@Override
public boolean check(Message message) {
if (ended) {
return false;
} else if (last.check(message)) {
ended = true;
return true;
} else if (match != null) {
return match.check(message);
} else {
return false;
}
}
};
}
public static MessageFilter once(final MessageFilter filter) {
return new MessageFilter() {
AtomicBoolean match = new AtomicBoolean(true);
@Override
public boolean check(Message message) {
if (match.get() && filter.check(message)) {
return match.getAndSet(false);
} else {
return false;
}
}
};
}
}