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/*
* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
*
* Copyright @ 2015 Atlassian Pty Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.java.sip.communicator.impl.protocol.irc;
import java.util.*;
/**
* IRC mode parser.
*
* Parses a mode string and returns individual mode entries complete with
* parameters, if any.
*
* @author Danny van Heumen
*/
public class ModeParser
{
/**
* List of parsed, processed modes.
*/
private final List<ModeEntry> modes = new ArrayList<ModeEntry>();
/**
* Index of current parameter.
*/
private int index = 0;
/**
* Additional parameters.
*/
private String[] params;
/**
* Constructor for initiating mode parser and parsing mode string.
*
* @param modestring mode string that should be parsed
*/
protected ModeParser(final String modestring)
{
String[] parts = modestring.split(" ");
String mode = parts[0];
this.params = new String[parts.length - 1];
System.arraycopy(parts, 1, this.params, 0, parts.length - 1);
parse(mode);
}
/**
* Parse a complete mode string and extract individual mode entries.
*
* @param modestring full mode string
*/
private void parse(final String modestring)
{
Boolean addition = null;
for (char c : modestring.toCharArray())
{
switch (c)
{
case '+':
addition = true;
break;
case '-':
addition = false;
break;
default:
if (addition == null)
{
throw new IllegalStateException(
"expect modifier (+ or -) first");
}
try
{
ModeEntry entry = process(addition, c);
modes.add(entry);
}
catch (ArrayIndexOutOfBoundsException e)
{
throw new IllegalArgumentException("invalid mode string "
+ "provided: parameter missing", e);
}
break;
}
}
}
/**
* Process mode character given state of addition/removal.
*
* @param add indicates whether mode change is addition or removal
* @param mode mode character
* @return returns an entry that contains all parts of an individual mode
* change
*/
private ModeEntry process(final boolean add, final char mode)
{
switch (mode)
{
case 'O':
return new ModeEntry(add, Mode.OWNER, this.params[this.index++]);
case 'o':
return new ModeEntry(add, Mode.OPERATOR, this.params[this.index++]);
case 'v':
return new ModeEntry(add, Mode.VOICE, this.params[this.index++]);
case 'l':
String[] limitparams;
if (add)
{
limitparams = new String[]
{ this.params[this.index++] };
}
else
{
limitparams = new String[] {};
}
return new ModeEntry(add, Mode.LIMIT, limitparams);
case 'p':
return new ModeEntry(add, Mode.PRIVATE);
case 's':
return new ModeEntry(add, Mode.SECRET);
case 'i':
return new ModeEntry(add, Mode.INVITE);
case 'b':
return new ModeEntry(add, Mode.BAN, this.params[this.index++]);
default:
return new ModeEntry(add, Mode.UNKNOWN, "" + mode);
}
}
/**
* Get list of modes.
*
* @return returns list of parsed modes
*/
public List<ModeEntry> getModes()
{
return modes;
}
/**
* Class for single mode entry, optionally with corresponding parameter(s).
*/
public static final class ModeEntry
{
/**
* Flag to indicate addition or removal of mode.
*/
private final boolean added;
/**
* Type of mode.
*/
private final Mode mode;
/**
* Optional additional parameter(s).
*/
private final String[] params;
/**
* Constructor.
*
* @param add true if mode is added, false if it is removed
* @param mode type of mode
* @param params optional, additional parameters
*/
private ModeEntry(final boolean add, final Mode mode,
final String... params)
{
this.added = add;
this.mode = mode;
this.params = params;
}
/**
* Added or removed.
*
* @return returns true if added, removed otherwise
*/
public boolean isAdded()
{
return this.added;
}
/**
* Get type of mode.
*
* @return returns enum instance of mode
*/
public Mode getMode()
{
return this.mode;
}
/**
* Get additional parameters.
*
* @return returns array of additional parameters if any
*/
public String[] getParams()
{
return this.params;
}
}
}
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