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59 lines
1.9 KiB
59 lines
1.9 KiB
/**
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* Role.java
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* Copyright 2009 by Michael Peter Christen, Frankfurt a. M., Germany
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* First published 03.12.2009 at http://yacy.net
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*
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* $LastChangedDate$
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* $LastChangedRevision$
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* $LastChangedBy$
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.ai.greedy;
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/**
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* a Role object is usually an enumeration object that is produced
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* in a enumeration that implements the Role interface.
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* All role object instances must define that one specific other Role
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* follows the current role. If there are undefined role or multiple role
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* situations, these may be declared with special role instance constants
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*/
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public interface Role {
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/**
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* define which other role shall follow to the current role
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* this returns a cloned role
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* @return the next role
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*/
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public Role nextRole();
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/**
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* necessary equals method for usage of Role in hash tables
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* @param obj
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* @return true if the current role and the given role are equal
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*/
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@Override
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public boolean equals(Object obj);
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/**
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* necessary hashCode method for usage of Role in hash tables
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* @return a hash code of the role
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*/
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@Override
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public int hashCode();
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}
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