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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetBlob.java @ 0:a5a898f6886c

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Copy of MonetDB java directory changeset e6e32756ad31.
author Sjoerd Mullender <sjoerd@acm.org>
date Wed, 21 Sep 2016 09:34:48 +0200 (2016-09-21)
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children 7e0d71a22677 e092fa8d9ab7
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1 /*
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2 * This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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5 *
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2016 MonetDB B.V.
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7 */
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8
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9 package nl.cwi.monetdb.jdbc;
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10
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11 import java.sql.*;
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12 import java.util.Arrays;
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13 import java.io.*;
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14
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15 /**
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16 * The MonetBlob class implements the {@link java.sql.Blob} interface. Because
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17 * MonetDB/SQL currently has no support for streams, this class is a
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18 * shallow wrapper of a byte[]. It is more or less supplied to
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19 * enable an application that depends on it to run. It may be obvious
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20 * that it is a real resource expensive workaround that contradicts the
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21 * benefits for a Blob: avoidance of huge resource consumption.
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22 *
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23 * @author Fabian Groffen
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24 */
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25 public class MonetBlob implements Blob {
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26 private byte[] buf;
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27
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28 protected MonetBlob(byte[] data) {
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29 buf = data;
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30 }
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31
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32 static MonetBlob create(String in) {
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33 int len = in.length() / 2;
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34 byte[] buf = new byte[len];
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35 for (int i = 0; i < len; i++)
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36 buf[i] = (byte)Integer.parseInt(in.substring(2 * i, (2 * i) + 2), 16);
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37 return new MonetBlob(buf);
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38 }
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39
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40
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41 //== begin interface Blob
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42
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43 /**
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44 * This method frees the Blob object and releases the resources that
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45 * it holds. The object is invalid once the free method is called.
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46 *
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47 * After free has been called, any attempt to invoke a method other
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48 * than free will result in a SQLException being thrown. If free is
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49 * called multiple times, the subsequent calls to free are treated
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50 * as a no-op.
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51 *
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52 * @throws SQLException if an error occurs releasing the Blob's
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53 * resources
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54 * @throws SQLFeatureNotSupportedException - if the JDBC driver does
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55 * not support this method
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56 */
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57 @Override
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58 public void free() throws SQLException {
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59 buf = null;
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60 }
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61
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62 /**
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63 * Retrieves the BLOB value designated by this Blob instance as a
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64 * stream.
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65 *
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66 * @return a stream containing the BLOB data
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67 * @throws SQLException if there is an error accessing the BLOB value
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68 * @throws SQLFeatureNotSupportedException if the JDBC driver does
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69 * not support this method
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70 */
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71 @Override
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72 public InputStream getBinaryStream() throws SQLException {
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73 if (buf == null)
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74 throw new SQLException("This Blob object has been freed", "M1M20");
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75 return new ByteArrayInputStream(buf);
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76 }
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77
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78 /**
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79 * Returns an InputStream object that contains a partial Blob value,
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80 * starting with the byte specified by pos, which is length bytes in
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81 * length.
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82 *
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83 * @param pos the offset to the first byte of the partial value to
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84 * be retrieved. The first byte in the Blob is at position 1
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85 * @param length the length in bytes of the partial value to be
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86 * retrieved
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87 * @return InputStream through which the partial Blob value can be
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88 * read.
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89 * @throws SQLException if pos is less than 1 or if pos is
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90 * greater than the number of bytes in the Blob or if pos +
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91 * length is greater than the number of bytes in the Blob
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92 * @throws SQLFeatureNotSupportedException if the JDBC driver does
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93 * not support this method
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94 */
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95 @Override
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96 public InputStream getBinaryStream(long pos, long length)
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97 throws SQLException
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98 {
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99 if (buf == null)
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100 throw new SQLException("This Blob object has been freed", "M1M20");
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101 if (pos < 1)
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102 throw new SQLException("pos is less than 1", "M1M05");
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103 if (pos - 1 > buf.length)
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104 throw new SQLException("pos is greater than the number of bytes in the Blob", "M1M05");
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105 if (pos - 1 + length > buf.length)
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106 throw new SQLException("pos + length is greater than the number of bytes in the Blob", "M1M05");
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107 return new ByteArrayInputStream(buf, (int)(pos - 1), (int)length);
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108 }
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109
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110 /**
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111 * Retrieves all or part of the BLOB value that this Blob object
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112 * represents, as an array of bytes. This byte array contains up to
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113 * length consecutive bytes starting at position pos.
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114 *
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115 * @param pos the ordinal position of the first byte in the BLOB
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116 * value to be extracted; the first byte is at position 1.
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117 * @param length the number of consecutive bytes to be copied
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118 * @return a byte array containing up to length consecutive bytes
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119 * from the BLOB value designated by this Blob object,
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120 * starting with the byte at position pos.
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121 * @throws SQLException if there is an error accessing the
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122 * BLOB value
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123 */
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124 @Override
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125 public byte[] getBytes(long pos, int length) throws SQLException {
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126 if (buf == null)
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127 throw new SQLException("This Blob object has been freed", "M1M20");
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128 try {
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129 return Arrays.copyOfRange(buf, (int) pos - 1, (int) pos - 1 + length);
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130 } catch (IndexOutOfBoundsException e) {
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131 throw new SQLException(e.getMessage(), "M0M10");
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132 }
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133 }
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134
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135 /**
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136 * Returns the number of bytes in the BLOB value designated by this
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137 * Blob object.
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138 *
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139 * @return length of the BLOB in bytes
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140 * @throws SQLException if there is an error accessing the length
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141 * of the BLOB value
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142 */
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143 @Override
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144 public long length() throws SQLException {
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145 if (buf == null)
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146 throw new SQLException("This Blob object has been freed", "M1M20");
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147 return (long)buf.length;
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148 }
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149
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150 /**
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151 * Retrieves the byte position in the BLOB value designated by this
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152 * Blob object at which pattern begins. The search begins at
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153 * position start.
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154 *
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155 * @param pattern the Blob object designating the BLOB value for
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156 * which to search
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157 * @param start the position in the BLOB value at which to begin
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158 * searching; the first position is 1
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159 * @return the position at which the pattern begins, else -1
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160 * @throws SQLException if there is an error accessing the
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161 * BLOB value
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162 */
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163 @Override
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164 public long position(Blob pattern, long start) throws SQLException {
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165 return position(pattern.getBytes(1L, (int)pattern.length()), start);
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166 }
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167
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168 /**
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169 * Retrieves the byte position at which the specified byte array
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170 * pattern begins within the BLOB value that this Blob object
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171 * represents. The search for pattern begins at position start.
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172 *
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173 * @param pattern the byte array for which to search
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174 * @param start the position at which to begin searching;
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175 * the first position is 1
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176 * @return the position at which the pattern appears, else -1
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177 * @throws SQLException if there is an error accessing the
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178 * BLOB value
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179 */
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180 @Override
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181 public long position(byte[] pattern, long start) throws SQLException {
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182 if (buf == null)
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183 throw new SQLException("This Blob object has been freed", "M1M20");
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184 try {
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185 for (int i = (int)(start - 1); i < buf.length - pattern.length; i++) {
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186 int j;
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187 for (j = 0; j < pattern.length; j++) {
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188 if (buf[i + j] != pattern[j])
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189 break;
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190 }
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191 if (j == pattern.length)
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192 return i;
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193 }
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194 } catch (IndexOutOfBoundsException e) {
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195 throw new SQLException(e.getMessage(), "M0M10");
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196 }
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197 return -1;
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198 }
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199
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200 /**
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201 * Retrieves a stream that can be used to write to the BLOB value
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202 * that this Blob object represents. The stream begins at position
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203 * pos. The bytes written to the stream will overwrite the existing
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204 * bytes in the Blob object starting at the position pos. If the end
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
205 * of the Blob value is reached while writing to the stream, then
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
206 * the length of the Blob value will be increased to accomodate the
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
207 * extra bytes.
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
208 *
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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209 * @param pos the position in the BLOB value at which to start
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diff changeset
210 * writing; the first position is 1
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diff changeset
211 * @return a java.io.OutputStream object to which data can be
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212 * written
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213 * @throws SQLException if there is an error accessing the BLOB
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diff changeset
214 * value or if pos is less than 1
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Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
215 * @throws SQLFeatureNotSupportedException if the JDBC driver does
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Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
216 * not support this method
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
217 */
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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218 @Override
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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219 public OutputStream setBinaryStream(long pos) throws SQLException {
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diff changeset
220 if (buf == null)
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
221 throw new SQLException("This Blob object has been freed", "M1M20");
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
222 if (pos < 1)
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
223 throw new SQLException("pos is less than 1", "M1M05");
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parents:
diff changeset
224 throw new SQLFeatureNotSupportedException("Operation setBinaryStream(long pos) currently not supported", "0A000");
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diff changeset
225 }
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
226
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
227 /**
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
228 * Writes the given array of bytes to the BLOB value that this Blob
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
229 * object represents, starting at position pos, and returns the
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
230 * number of bytes written.
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
231 *
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
232 * @param pos the position in the BLOB object at which to start
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
233 * writing
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
234 * @param bytes the array of bytes to be written to the BLOB value
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
235 * that this Blob object represents
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
236 * @return the number of bytes written
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
237 * @throws SQLException if there is an error accessing the
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Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
238 * BLOB value
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
239 */
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
240 @Override
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
241 public int setBytes(long pos, byte[] bytes) throws SQLException {
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
242 return setBytes(pos, bytes, 1, bytes.length);
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diff changeset
243 }
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
244
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
245 /**
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
246 * Writes all or part of the given byte array to the BLOB value that
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
247 * this Blob object represents and returns the number of bytes
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diff changeset
248 * written. Writing starts at position pos in the BLOB value; len
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diff changeset
249 * bytes from the given byte array are written.
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diff changeset
250 *
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
251 * @param pos the position in the BLOB object at which to start
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diff changeset
252 * writing
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
253 * @param bytes the array of bytes to be written to this BLOB
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diff changeset
254 * object
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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255 * @param offset the offset into the array bytes at which to start
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256 * reading the bytes to be set
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257 * @param len the number of bytes to be written to the BLOB value
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258 * from the array of bytes bytes
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259 * @return the number of bytes written
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260 * @throws SQLException if there is an error accessing the
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261 * BLOB value
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262 */
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263 @Override
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264 public int setBytes(long pos, byte[] bytes, int offset, int len)
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265 throws SQLException
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266 {
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267 if (buf == null)
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268 throw new SQLException("This Blob object has been freed", "M1M20");
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269 try {
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270 /* transactions? what are you talking about? */
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271 for (int i = (int)pos; i < len; i++)
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272 buf[i] = bytes[offset - 1 + i];
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273 } catch (IndexOutOfBoundsException e) {
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274 throw new SQLException(e.getMessage(), "M0M10");
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275 }
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276 return len;
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277 }
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278
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279 /**
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280 * Truncates the BLOB value that this Blob object represents to be
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281 * len bytes in length.
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282 *
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283 * @param len the length, in bytes, to which the BLOB value
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284 * should be truncated
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285 * @throws SQLException if there is an error accessing the
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286 * BLOB value
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287 */
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288 @Override
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289 public void truncate(long len) throws SQLException {
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290 if (buf == null)
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291 throw new SQLException("This Blob object has been freed", "M1M20");
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292 if (buf.length > len) {
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293 byte[] newbuf = new byte[(int)len];
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294 for (int i = 0; i < len; i++)
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295 newbuf[i] = buf[i];
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296 buf = newbuf;
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297 }
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298 }
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299 }