- refactoring: added new content package, which will contain connector classes for different types of data sources to import texts into the YaCy index
- refactoring: migrated data objects for the new connector classes - added a DAO interface class to specify an abstract interface for database retrieval connector methods git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@5977 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
16 years ago
parent
f246928c20
commit
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// Dao.java
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// (C) 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 25.05.2009 on http://yacy.net
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program 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
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.content.dao;
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import java.util.ArrayList;
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import java.util.Date;
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import de.anomic.content.DCEntry;
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/*
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* Database Access Objects are used to get a normalized view on database objects with java objects
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*/
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public interface Dao {
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// item-oriented retrieval
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/**
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* get the maximum number of items in the database
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*/
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public int maxItems();
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/**
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* retrieve a single item from the database
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* @param item
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* @return
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*/
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public DCEntry get(int item);
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/**
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* retrieve a list of entries in the database;
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* the object denoted with until is not contained in the list
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* @param from
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* @param until
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* @return
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*/
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public ArrayList<DCEntry> get(int from, int until);
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// date-oriented retrieval
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/**
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* return the date of the first entry
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*/
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public Date firstEntry();
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/**
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* return the date of the latest entry
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* @return
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*/
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public Date latestEntry();
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/**
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* get a list of entries in the database;
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* the returned list contains all entries up to the most recent
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* @param from
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* @return
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*/
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public ArrayList<DCEntry> get(Date from);
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}
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