record.java

很好的基于java的手机文本阅读器anyview 2.0源码,

package com.ismyway.anyview;

import javax.microedition.rms.RecordStore;
import javax.microedition.rms.RecordStoreException;
import javax.microedition.rms.*;

/**
 * <p>Title: AnyView</p>
 *
 * <p>Description: E680(I) Reader</p>
 *
 * <p>Copyright: Copyright (c) 2005</p>
 *
 * <p>Company: www.ismyway.com</p>
 *
 * @author ZhangJian
 * @version 1.0
 */
public class Record {
    private String name;
    private RecordStore rs;
    private boolean open;

    public Record(String name) {
        this.name = name;
    }

    public boolean open() {
        open = true;
        try {
            rs = RecordStore.openRecordStore(name, true);
        } catch (RecordStoreException ex) {
            open = false;
        }
        return open;
    }

    public int getNumRecords() {
        int num = -1;
        if (open) {
            try {
                num = rs.getNumRecords();
            } catch (RecordStoreNotOpenException ex) {
                num = -1;
            }
        }
        return num;
    }

    public int getNextRecordID() {
        int num = -1;
        try {
            num = rs.getNextRecordID();
        } catch (RecordStoreNotOpenException ex) {
            num = -1;
        } catch (RecordStoreException ex) {
            num = -1;
        }
        return num;
    }

    public boolean addRecord(byte[] b) {
        boolean flag = true;
        if (b == null) {
            return false;
        }

        try {
            rs.addRecord(b, 0, b.length);
        } catch (RecordStoreNotOpenException ex) {
            flag = false;
        } catch (RecordStoreException ex) {
            flag = false;
        }
        return flag;
    }

    public boolean setRecord(int i, byte[] b) {
        boolean flag = true;
        if (b == null) {
            return false;
        }

        try {
            rs.setRecord(i, b, 0, b.length);
        } catch (RecordStoreNotOpenException ex) {
            flag = false;
        } catch (RecordStoreException ex) {
            flag = false;
        }
        return flag;
    }

    public byte[] getRecord(int i) {
        byte[] b = null;
        try {
            b = rs.getRecord(i);
        } catch (InvalidRecordIDException ex) {
            b = null;
        } catch (RecordStoreNotOpenException ex) {
            b = null;
        } catch (RecordStoreException ex) {
            b = null;
        }
        return b;
    }

    public void close() {
        try {
            rs.closeRecordStore();
        } catch (RecordStoreNotOpenException ex) {
        } catch (RecordStoreException ex) {
        }
    }

    public static void deleteRecordStore(String name) {
        try {
            RecordStore.deleteRecordStore(name);
        } catch (RecordStoreException ex) {
        }
    }
}