////////////////////////////////////////////////////////////////////////////////

 // checkstyle: Checks Java source code for adherence to a set of rules.

 // Copyright (C) 2001-2014  Oliver Burn

 //

 // This library is free software; you can redistribute it and/or

 // modify it under the terms of the GNU Lesser General Public

 // License as published by the Free Software Foundation; either

 // version 2.1 of the License, or (at your option) any later version.

 //

 // This library is distributed in the hope that it will be useful,

 // but WITHOUT ANY WARRANTY; without even the implied warranty of

 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 // Lesser General Public License for more details.

 //

 // You should have received a copy of the GNU Lesser General Public

 // License along with this library; if not, write to the Free Software

 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 ////////////////////////////////////////////////////////////////////////////////

 package com.puppycrawl.tools.checkstyle.filters;

 import com.google.common.collect.Sets;

 import java.util.Set;

 import java.util.StringTokenizer;

 /**

  * <p>

  * This filter accepts an integer that matches a CSV value, where

  * each value is an integer or a range of integers.

  * </p>

  * @author Rick Giles

  * @author o_sukhodolsky

  */

 class CSVFilter implements IntFilter

 {

     /** filter set */

     private final Set<IntFilter> mFilters = Sets.newHashSet();

     /**

      * Adds a IntFilter to the set.

      * @param aFilter the IntFilter to add.

      */

     public void addFilter(IntFilter aFilter)

     {

         mFilters.add(aFilter);

     }

     /**

      * Returns the IntFilters of the filter set.

      * @return the IntFilters of the filter set.

      */

     protected Set<IntFilter> getFilters()

     {

         return mFilters;

     }

     /**

      * Constructs a <code>CSVFilter</code> from a CSV, Comma-Separated Values,

      * string. Each value is an integer, or a range of integers. A range of

      * integers is of the form integer-integer, such as 1-10.

      * Note: integers must be non-negative.

      * @param aPattern the CSV string.

      * @throws NumberFormatException if a component substring does not

      * contain a parsable integer.

      */

     public CSVFilter(String aPattern)

         throws NumberFormatException

     {

         final StringTokenizer tokenizer = new StringTokenizer(aPattern, ",");

         while (tokenizer.hasMoreTokens()) {

             final String token = tokenizer.nextToken().trim();

             final int index = token.indexOf("-");

             if (index == -1) {

                 final int matchValue = Integer.parseInt(token);

                 addFilter(new IntMatchFilter(matchValue));

             }

             else {

                 final int lowerBound =

                     Integer.parseInt(token.substring(0, index));

                 final int upperBound =

                     Integer.parseInt(token.substring(index + 1));

                 addFilter(new IntRangeFilter(lowerBound, upperBound));

             }

         }

     }

     /**

      * Determines whether an Integer matches a CSV integer value.

      * @param aInt the Integer to check.

      * @return true if aInt is an Integer that matches a CSV value.

      */

     public boolean accept(int aInt)

     {

         for (IntFilter filter : getFilters()) {

             if (filter.accept(aInt)) {

                 return true;

             }

         }

         return false;

     }

     @Override

     public String toString()

     {

         return mFilters.toString();

     }

     @Override

     public int hashCode()

     {

         return mFilters.hashCode();

     }

     @Override

     public boolean equals(Object aObject)

     {

         if (aObject instanceof CSVFilter) {

             final CSVFilter other = (CSVFilter) aObject;

             return this.mFilters.equals(other.mFilters);

         }

         return false;

     }

 }