rmsadapter.java

实现了一个基于j2me移动gps定位系统

/*
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 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * You may compile, use, perform and display the following files with
 * original Java Smart Ticket Sample Application code obtained from Sun
 * Microsystems, Inc. only:
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/*
 * $Id: RMSAdapter.java 107 2007-09-05 02:02:55Z khanh.lnq $
 * $URL: https://jvnmobilegis.googlecode.com/svn/trunk/src/org/javavietnam/gis/client/midp/model/RMSAdapter.java $
 * $Author: khanh.lnq $
 * $Revision: 107 $
 * $Date: 2007-09-05 09:02:55 +0700 (Wed, 05 Sep 2007) $
 *
 * ====================================================================
 *
 * Copyright (C) 2006-2007 by JVNGIS
 *
 * All copyright notices regarding JVNMobileGIS MUST remain
 * intact in the Java codes and resource files.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Support can be obtained from project homepage at:
 * http://code.google.com/p/jvnmobilegis/
 *
 * Correspondence and Marketing Questions can be sent to:
 * khanh.lnq AT gmail.com
 * 
 * @version: 1.0
 * @author: Khanh Le
 * @Date Created: 22 Jun 2007
 */

package org.javavietnam.gis.client.midp.model;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import javax.microedition.rms.RecordEnumeration;
import javax.microedition.rms.RecordFilter;
import javax.microedition.rms.RecordStore;
import javax.microedition.rms.RecordStoreException;

import org.javavietnam.gis.shared.midp.ApplicationException;

class RMSAdapter {

    private static final String RECORD_STORE_INDEX = "INDEX";
    private static final String RECORD_STORE_LOCAL_DATA = "LOCAL_DATA";
    private RecordStore indexRecordStore;
    private RecordStore localDataRecordStore;

    /**
     * @link dependency
     */
    /* # IndexEntry lnkIndexEntry; */
    private static class IndexEntryFilter implements RecordFilter {

        private String key;
        private int type;
        private int mode;

        public IndexEntryFilter(String key, int type) {
            this(key, type, IndexEntry.MODE_ANY);
        }

        public IndexEntryFilter(String key, int type, int mode) {
            this.key = key;
            this.type = type;
            this.mode = mode;

        }

        public boolean matches(byte[] candidate) {
            try {
                return IndexEntry.matches(candidate, key, type, mode);
            } catch (IOException ioe) {
                ioe.printStackTrace();

                return false;
            }
        }

    }

    public RMSAdapter() throws ApplicationException {
        try {
            indexRecordStore = RecordStore.openRecordStore(RECORD_STORE_INDEX,
                    true);
            localDataRecordStore = RecordStore.openRecordStore(
                    RECORD_STORE_LOCAL_DATA, true);

        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            // FIXME: Find a better way to handle this
            // try to delete all RecordStores
            String[] listRecordStores = RecordStore.listRecordStores();
            try {
                for (int i = 0; i < listRecordStores.length; i++) {
                    RecordStore.deleteRecordStore(listRecordStores[i]);
                }
            } catch (RecordStoreException re) {
                throw new ApplicationException(re);
            }

            throw new ApplicationException(rse);
        }
    }

    public void closeRecordStores() throws ApplicationException {
        try {
            indexRecordStore.closeRecordStore();
            localDataRecordStore.closeRecordStore();

        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        }
    }

    public void addIndexEntry(IndexEntry indexEntry)
            throws ApplicationException {
        try {
            byte[] data = indexEntry.serialize();

            if (indexRecordStore.getNumRecords() > 0) {
                RecordEnumeration records = indexRecordStore.enumerateRecords(
                        new IndexEntryFilter(indexEntry.getKey(), indexEntry
                                .getType()), null, false);

                if (records.hasNextElement()) {
                    indexRecordStore.setRecord(records.nextRecordId(), data, 0,
                            data.length);
                } else {
                    indexRecordStore.addRecord(data, 0, data.length);
                }
            } else {
                indexRecordStore.addRecord(data, 0, data.length);
            }

        } catch (IOException ioe) {
            throw new ApplicationException(ioe);
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        }
    }

    public IndexEntry[] getIndexEntries(int type, int mode)
            throws ApplicationException {
        try {
            if (indexRecordStore.getNumRecords() > 0) {
                RecordEnumeration records = indexRecordStore.enumerateRecords(
                        new IndexEntryFilter(null, type, mode), null, false);
                IndexEntry[] indexEntries = new IndexEntry[records.numRecords()];

                for (int i = 0; i < indexEntries.length; i++) {
                    byte[] data = indexRecordStore.getRecord(records
                            .nextRecordId());

                    indexEntries[i] = IndexEntry.deserialize(data);
                }

                return indexEntries;
            } else {
                return new IndexEntry[0];
            }
        } catch (IOException ioe) {
            throw new ApplicationException(ioe);
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        }
    }

    public IndexEntry getIndexEntry(String key, int type, int mode)
            throws ApplicationException {
        try {
            if (indexRecordStore.getNumRecords() > 0) {
                RecordEnumeration records = indexRecordStore.enumerateRecords(
                        new IndexEntryFilter(key, type, mode), null, false);

                if (records.hasNextElement()) {
                    byte[] data = indexRecordStore.getRecord(records
                            .nextRecordId());

                    return IndexEntry.deserialize(data);
                }
            }

            return null;
        } catch (IOException ioe) {
            throw new ApplicationException(ioe);
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        }
    }

    public void deleteIndexEntry(String key, int type)
            throws ApplicationException {
        try {
            if (indexRecordStore.getNumRecords() > 0) {
                RecordEnumeration records = indexRecordStore.enumerateRecords(
                        new IndexEntryFilter(key, type), null, false);

                while (records.hasNextElement()) {
                    indexRecordStore.deleteRecord(records.nextRecordId());
                }
            }

        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        }
    }

    private void delete(RecordStore recordStore, int recordId)
            throws ApplicationException {
        try {
            recordStore.deleteRecord(recordId);

        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        }
    }

    public Preferences loadPreferences(int recordId)
            throws ApplicationException {
        try {
            byte[] data = localDataRecordStore.getRecord(recordId);

            return Preferences.deserialize(new DataInputStream(
                    new ByteArrayInputStream(data)));
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        }
    }

    public int storePreferences(Preferences preferences, int recordId)
            throws ApplicationException {
        try {
            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            DataOutputStream dataStream = new DataOutputStream(stream);

            preferences.serialize(dataStream);
            dataStream.flush();

            if (recordId > 0) {
                localDataRecordStore.setRecord(recordId, stream.toByteArray(),
                        0, stream.size());
            } else {
                recordId = localDataRecordStore.addRecord(stream.toByteArray(),
                        0, stream.size());
            }

            return recordId;
        } catch (IOException ioe) {
            throw new ApplicationException(ioe);
        } catch (RecordStoreException rse) {
            rse.printStackTrace();

            throw new ApplicationException(rse);
        }
    }

}