svn-gvsig-desktop / branches / Mobile_Compatible_Hito_1 / libFMap_mobile_shp_driver / src-file / org / gvsig / data / datastores / vectorial / file / FalseByteBuffer.java @ 21865
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1 | 21865 | jldominguez | /* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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2 | *
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3 | * Copyright (C) 2006 Prodevelop and Generalitat Valenciana.
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4 | *
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5 | * This program is free software; you can redistribute it and/or
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6 | * modify it under the terms of the GNU General Public License
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7 | * as published by the Free Software Foundation; either version 2
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8 | * of the License, or (at your option) any later version.
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9 | *
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU General Public License
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16 | * along with this program; if not, write to the Free Software
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17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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18 | *
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19 | * For more information, contact:
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20 | *
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21 | * Generalitat Valenciana
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22 | * Conselleria d'Infraestructures i Transport
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23 | * Av. Blasco Ib??ez, 50
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24 | * 46010 VALENCIA
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25 | * SPAIN
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26 | *
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27 | * +34 963862235
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28 | * gvsig@gva.es
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29 | * http://www.gvsig.gva.es
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30 | *
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31 | * or
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32 | *
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33 | * Prodevelop Integraci?n de Tecnolog?as SL
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34 | * Conde Salvatierra de ?lava , 34-10
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35 | * 46004 Valencia
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36 | * Spain
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37 | *
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38 | * +34 963 510 612
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39 | * +34 963 510 968
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40 | * gis@prodevelop.es
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41 | * http://www.prodevelop.es
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42 | *
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43 | * or
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44 | *
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45 | * Instituto de Rob?tica
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46 | * Apartado de correos 2085
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47 | * 46071 Valencia
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48 | * (Spain)
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49 | *
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50 | * +34 963 543 577
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51 | * jjordan@robotica.uv.es
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52 | * http://robotica.uv.es
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53 | *
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54 | */
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55 | |||
56 | package org.gvsig.data.datastores.vectorial.file; |
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57 | |||
58 | import java.nio.ByteOrder; |
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59 | |||
60 | /**
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61 | * This class replaces the byte buffer used in J2SE to store a file in memory.
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62 | *
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63 | * @see java.nio.ByteOrder
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64 | *
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65 | * @author jldominguez
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66 | *
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67 | */
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68 | public class FalseByteBuffer { |
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69 | |||
70 | private byte[] bytes; |
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71 | private ByteOrder byteOrder = ByteOrder.LITTLE_ENDIAN; |
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72 | private int pos = 0; |
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73 | |||
74 | /**
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75 | * Constructor
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76 | * @param bb array of bytes to be stored
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77 | */
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78 | public FalseByteBuffer(byte[] bb) { |
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79 | bytes = bb; |
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80 | } |
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81 | |||
82 | /**
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83 | * Moves file cursor to position p
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84 | * @param p the new position
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85 | */
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86 | public void position(int p) { |
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87 | pos = p; |
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88 | } |
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89 | |||
90 | /**
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91 | *
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92 | * @return current cursor position
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93 | */
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94 | public int getPosition() { |
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95 | return pos;
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96 | } |
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97 | |||
98 | /**
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99 | * @return byte pointed by cursor then increases cursor
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100 | */
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101 | public byte getByte() { |
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102 | byte resp = bytes[pos];
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103 | pos++; |
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104 | return resp;
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105 | } |
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106 | |||
107 | /**
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108 | * Gets one byte
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109 | * @param ind index of the byte of interest
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110 | * @return the byte of interest
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111 | */
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112 | public byte getByte(int ind) { |
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113 | return bytes[ind];
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114 | } |
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115 | |||
116 | /**
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117 | * @return integer pointed by cursor then increases cursor
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118 | */
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119 | public int getInt() { |
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120 | int resp = getInt(bytes, pos);
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121 | pos = pos + 4;
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122 | return resp;
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123 | } |
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124 | |||
125 | /**
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126 | * @return short pointed by cursor then increases cursor
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127 | */
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128 | public short getShort() { |
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129 | short resp = getShort(bytes, pos);
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130 | pos = pos + 2;
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131 | return resp;
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132 | } |
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133 | |||
134 | /**
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135 | * Gets the integer at a certain position
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136 | * @param index the index of interest
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137 | * @return the integer at a certain position
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138 | */
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139 | public int getInt(int index) { |
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140 | int resp = getInt(bytes, index);
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141 | return resp;
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142 | } |
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143 | |||
144 | /**
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145 | * Gets some bytes.
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146 | * @param out the array of bytes to be filled
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147 | */
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148 | public void getBytes(byte[] out) { |
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149 | for (int i=0; i<out.length; i++) { |
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150 | out[i] = getByte(pos + i); |
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151 | } |
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152 | pos = pos + out.length; |
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153 | } |
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154 | |||
155 | /**
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156 | * @return double pointed by cursor then increases cursor
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157 | */
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158 | public double getDouble() { |
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159 | double resp = getDouble(bytes, pos);
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160 | pos = pos + 8;
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161 | return resp;
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162 | } |
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163 | |||
164 | private int getInt(final byte[] data, final int offset) { |
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165 | return (int) getNumber(data, offset, 4); |
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166 | } |
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167 | |||
168 | |||
169 | private short getShort(final byte[] data, final int offset) { |
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170 | return (short) getNumber(data, offset, 2); |
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171 | } |
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172 | |||
173 | |||
174 | private long getNumber(final byte[] data, final int offset, final int size) { |
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175 | long result = 0; |
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176 | |||
177 | if (byteOrder == ByteOrder.LITTLE_ENDIAN) { |
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178 | |||
179 | for (int j = offset + size - 1; j >= offset; j--) { |
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180 | result <<= 8;
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181 | result |= 0xff & data[j];
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182 | } |
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183 | |||
184 | } else {
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185 | |||
186 | for (int j = offset; j <= offset + size - 1; j++) { |
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187 | result <<= 8;
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188 | result |= 0xff & data[j];
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189 | } |
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190 | |||
191 | } |
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192 | |||
193 | return result;
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194 | } |
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195 | |||
196 | private double getDouble(final byte[] data, final int offset) { |
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197 | return Double.longBitsToDouble(getNumber(data, offset, 8)); |
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198 | } |
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199 | |||
200 | /**
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201 | * Sets byte order (big endian, little endian)
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202 | * @param o byte order (big endian, little endian)
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203 | */
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204 | public void setByteOrder(ByteOrder o) { |
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205 | byteOrder = o; |
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206 | } |
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207 | |||
208 | |||
209 | |||
210 | } |