/*

  Copyright 2004-2008 Paul R. Holser, Jr.  All rights reserved.

  Licensed under the Academic Free License version 3.0

  */

 package joptsimple;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.Iterator;

 import java.util.List;

 /**

  * <p>Describes options that an option parser recognizes.</p>

  *

  * @since 1.0

  * @author <a href="mailto:pholser@alumni.rice.edu">Paul Holser</a>

  * @version $Id: OptionSpec.java,v 1.5 2008/05/22 14:22:33 pholser Exp $

  */

 abstract class OptionSpec {

     private final List options = new ArrayList();

     private final String description;

     protected OptionSpec( String option ) {

         this( Collections.singletonList( option ), "" );

     }

     protected OptionSpec( List options, String description ) {

         arrangeOptions( options );

         this.description = description;

     }

     List options() {

         return options;

     }

     String description() {

         return description;

     }

     abstract void handleOption( OptionParser parser, ArgumentList arguments,

         OptionSet detectedOptions, String detectedArgument );

     abstract boolean acceptsArguments();

     abstract boolean requiresArgument();

     abstract void accept( OptionSpecVisitor visitor );

     /**

      * {@inheritDoc}

      */

     public boolean equals( Object that ) {

         if ( this == that )

             return true;

         if ( that == null || !getClass().equals( that.getClass() ) )

             return false;

         OptionSpec other = (OptionSpec) that;

         return options.equals( other.options );

     }

     /**

      * {@inheritDoc}

      */

     public int hashCode() {

         return options.hashCode();

     }

     private void arrangeOptions( List unarranged ) {

         if ( unarranged.size() == 1 ) {

             this.options.addAll( unarranged );

             return;

         }

         List shortOptions = new ArrayList();

         List longOptions = new ArrayList();

         for ( Iterator iter = unarranged.iterator(); iter.hasNext(); ) {

             String next = (String) iter.next();

             if ( next.length() == 1 )

                 shortOptions.add( next );

             else

                 longOptions.add( next );

         }

         Collections.sort( shortOptions );

         Collections.sort( longOptions );

         this.options.addAll( shortOptions );

         this.options.addAll( longOptions );

     }

 }