TurtleDB
A mini distributed database system
src/ca/uqac/dim/turtledb/NAryCondition.java
Go to the documentation of this file.
00001 /*-------------------------------------------------------------------------
00002     Simple distributed database engine
00003     Copyright (C) 2012  Sylvain Hallé
00004 
00005     This program is free software: you can redistribute it and/or modify
00006     it under the terms of the GNU General Public License as published by
00007     the Free Software Foundation, either version 3 of the License, or
00008     (at your option) any later version.
00009 
00010     This program is distributed in the hope that it will be useful,
00011     but WITHOUT ANY WARRANTY; without even the implied warranty of
00012     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013     GNU General Public License for more details.
00014 
00015     You should have received a copy of the GNU General Public License
00016     along with this program.  If not, see <http://www.gnu.org/licenses/>.
00017  -------------------------------------------------------------------------*/
00018 package ca.uqac.dim.turtledb;
00019 
00020 import java.util.*;
00021 
00022 public abstract class NAryCondition extends Condition
00023 {
00024   public List<Condition> m_conditions;
00025   protected String m_operator;
00026   
00027   protected NAryCondition()
00028   {
00029     super();
00030     m_conditions = new LinkedList<Condition>();
00031   }
00032   
00033   public void addCondition(Condition c)
00034   {
00035     m_conditions.add(c);
00036   }
00037   
00038   protected void acceptNAry(ConditionVisitor v)
00039   {
00040     for (Condition c : m_conditions)
00041       c.accept(v);
00042   }
00043   
00049   public int getArity()
00050   {
00051     return m_conditions.size();
00052   }
00053   
00054   @Override
00055   public String toString()
00056   {
00057     StringBuilder out = new StringBuilder();
00058     int len = m_conditions.size();
00059     for (int i = 0; i < len; i++)
00060     {
00061       if (i > 0)
00062         out.append(m_operator);
00063       Condition c = m_conditions.get(i); 
00064       out.append(c);
00065     }
00066     return out.toString();
00067   }
00068 }