Package org.jresearch.gossip.dao.file.berkeleydb

Source Code of org.jresearch.gossip.dao.file.berkeleydb.BerkeleyDBFileProcessor

/*
* $Id: BerkeleyDBFileProcessor.java,v 1.5 2004/08/23 21:07:57 bel70 Exp $
*
* ***** BEGIN LICENSE BLOCK *****
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License
* at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and
* limitations under the License.
*
* The Original Code is JGossip forum code.
*
* The Initial Developer of the Original Code is the JResearch, Org.
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*              Dmitriy Belov <bel@jresearch.org>
*               .
* * ***** END LICENSE BLOCK ***** */
/*
* Created on 08.08.2004
*
*/
package org.jresearch.gossip.dao.file.berkeleydb;

import java.io.UnsupportedEncodingException;

import org.jresearch.gossip.dao.file.IFileProcessor;
import org.jresearch.gossip.exception.SystemException;

import com.sleepycat.je.Database;
import com.sleepycat.je.DatabaseEntry;
import com.sleepycat.je.DatabaseException;
import com.sleepycat.je.LockMode;
import com.sleepycat.je.OperationStatus;

/**
* @author Dmitry Belov
*/
public class BerkeleyDBFileProcessor implements IFileProcessor {

    private String dbname;

    private FileDbEnv env;

    /**
     * @throws SystemException
     * 
     */
    public BerkeleyDBFileProcessor() throws SystemException {
        env = FileDbEnv.getInstance();
    }

    private Database getFileDB() throws SystemException {
        return env.getFileDb(dbname);
    }

    /**
     * @return Returns the dbname.
     */
    public String getDbname() {
        return dbname;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.jresearch.gossip.dao.file.IFileProcessor#setDbname(java.lang.String)
     */
    public void setStoreName(String dbname) {
        this.dbname = dbname;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.jresearch.gossip.dao.file.IFileProcessor#saveFileData(byte[],
     *      java.lang.String)
     */
    public void saveFileData(byte[] data, String key) throws SystemException {
        Database db = null;
        try {
            db = getFileDB();
            DatabaseEntry theKey = new DatabaseEntry(key.getBytes("UTF-8"));
            DatabaseEntry theData = new DatabaseEntry(data);
            db.put(null, theKey, theData);
        } catch (UnsupportedEncodingException e) {
            throw new SystemException(e);
        } catch (DatabaseException e) {
            throw new SystemException(e);
        } finally {
            if (db != null) {
                try {
                    db.close();
                } catch (DatabaseException e) {
                    throw new SystemException(e);
                }
            }
        }
    }

    /*
     * (non-Javadoc)
     *
     * @see org.jresearch.gossip.dao.file.IFileProcessor#getFileData(java.lang.String)
     */
    public byte[] getFileData(String key) throws SystemException {
        Database db = null;
        try {
            db = getFileDB();
            DatabaseEntry theKey = new DatabaseEntry(key.getBytes("UTF-8"));
            DatabaseEntry theData = new DatabaseEntry();
            if (db.get(null, theKey, theData, LockMode.DEFAULT) == OperationStatus.SUCCESS) { return theData
                    .getData(); }
            return null;
        } catch (UnsupportedEncodingException e) {
            throw new SystemException(e);
        } catch (DatabaseException e) {
            throw new SystemException(e);
        } finally {
            if (db != null) {
                try {
                    db.close();
                } catch (DatabaseException e) {
                    throw new SystemException(e);
                }
            }
        }
    }

    /*
     * (non-Javadoc)
     *
     * @see org.jresearch.gossip.dao.file.IFileProcessor#removeFileData(java.lang.String)
     */
    public void removeFileData(String key) throws SystemException {
        Database db = null;
        try {
            db = getFileDB();
            DatabaseEntry theKey = new DatabaseEntry(key.getBytes("UTF-8"));
            db.delete(null, theKey);
        } catch (UnsupportedEncodingException e) {
            throw new SystemException(e);
        } catch (DatabaseException e) {
            throw new SystemException(e);
        } finally {
            if (db != null) {
                try {
                    db.close();
                } catch (DatabaseException e) {
                    throw new SystemException(e);
                }
            }
        }

    }

}
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