connectivity/com/sun/star/sdbcx/comp/hsqldb/StorageAccess.java

   1 /*
   2  * This file is part of the LibreOffice project.
   3  *
   4  * This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   7  *
   8  * This file incorporates work covered by the following license notice:
   9  *
  10  *   Licensed to the Apache Software Foundation (ASF) under one or more
  11  *   contributor license agreements. See the NOTICE file distributed
  12  *   with this work for additional information regarding copyright
  13  *   ownership. The ASF licenses this file to you under the Apache
  14  *   License, Version 2.0 (the "License"); you may not use this file
  15  *   except in compliance with the License. You may obtain a copy of
  16  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  17  */
  18
  19 package com.sun.star.sdbcx.comp.hsqldb;
  20
  21 @SuppressWarnings("ucd")
  22 public class StorageAccess implements org.hsqldb.lib.Storage {
  23     String key;
  24     String name;
  25     boolean readonly;
  26     NativeStorageAccess access;
  27     /** Creates a new instance of StorageAccess */
  28     public StorageAccess(String name,Boolean readonly,Object key) throws java.io.IOException{
  29         this.key = (String)key;
  30         this.name = name;
  31         this.readonly = readonly.booleanValue();
  32         try {
  33             access = new NativeStorageAccess(name,
  34                     this.readonly ? "r" : "rw"
  35                     ,key);
  36         } catch(Exception ex1){
  37             java.io.IOException ex2 = new java.io.IOException();
  38             ex2.initCause(ex1);
  39             throw ex2;
  40         }
  41     }
  42     public void close() throws java.io.IOException{
  43         access.close(name,key);
  44     }
  45
  46     public long getFilePointer() throws java.io.IOException{
  47         return access.getFilePointer(name,key);
  48     }
  49
  50     public long length() throws java.io.IOException{
  51         return access.length(name,key);
  52     }
  53
  54     public int read() throws java.io.IOException{
  55         return access.read(name,key);
  56     }
  57
  58     public void read(byte[] b, int off, int len) throws java.io.IOException{
  59         access.read(name,key,b,off,len);
  60     }
  61
  62     // based on the same code that reads an int from the .data file in HSQLDB
  63     public int readInt() throws java.io.IOException{
  64         byte [] tmp = new byte [4];
  65
  66         int count = access.read(name,key,tmp,0, 4);
  67
  68         if (count != 4){
  69             throw new java.io.IOException();
  70         }
  71
  72         count = 0;
  73         int ch0 = tmp[count++] & 0xff;
  74         int ch1 = tmp[count++] & 0xff;
  75         int ch2 = tmp[count++] & 0xff;
  76         int ch3 = tmp[count] & 0xff;
  77
  78         return ((ch0 << 24) + (ch1 << 16) + (ch2 << 8) + (ch3));
  79     }
  80
  81     public void seek(long position) throws java.io.IOException{
  82         access.seek(name,key,position);
  83     }
  84
  85     public void write(byte[] b, int offset, int length) throws java.io.IOException{
  86         access.write(name,key,b,offset,length);
  87     }
  88
  89     public void writeInt(int v) throws java.io.IOException{
  90         byte [] oneByte = new byte [4];
  91         oneByte[0] = (byte) ((v >>> 24) & 0xFF);
  92         oneByte[1] = (byte) ((v >>> 16) & 0xFF);
  93         oneByte[2] = (byte) ((v >>>  8) & 0xFF);
  94         oneByte[3] = (byte) ((v >>>  0) & 0xFF);
  95
  96         write(oneByte,0,4);
  97     }
  98
  99     public boolean isReadOnly() {
 100         return readonly;
 101     }
 102
 103     @SuppressWarnings("cast")
 104     public long readLong() throws java.io.IOException {
 105         return (((long) readInt()) << 32) + (((long) readInt()) & 0xFFFFFFFFL);
 106     }
 107
 108     public boolean wasNio() {
 109         return false;
 110     }
 111
 112     public void writeLong(long v) throws java.io.IOException {
 113         byte [] oneByte = new byte [8];
 114
 115         oneByte[0] = (byte) ((v >>> 56) & 0xFF);
 116         oneByte[1] = (byte) ((v >>> 48) & 0xFF);
 117         oneByte[2] = (byte) ((v >>> 40) & 0xFF);
 118         oneByte[3] = (byte) ((v >>> 32) & 0xFF);
 119         oneByte[4] = (byte) ((v >>> 24) & 0xFF);
 120         oneByte[5] = (byte) ((v >>> 16) & 0xFF);
 121         oneByte[6] = (byte) ((v >>>  8) & 0xFF);
 122         oneByte[7] = (byte) ((v >>>  0) & 0xFF);
 123
 124         write(oneByte,0,8);
 125     }
 126 }