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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetBlob.java @ 200:c38d4eaf5479

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It's 2018 now.
author Sjoerd Mullender <sjoerd@acm.org>
date Thu, 04 Jan 2018 13:24:01 +0100 (2018-01-04)
parents c5309def7d4b
children 5b13ccaba741 94131372ad0b
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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 *
200
c38d4eaf5479 It's 2018 now.
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2018 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.io.ByteArrayInputStream;
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12 import java.io.InputStream;
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13 import java.io.OutputStream;
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14 import java.sql.Blob;
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15 import java.sql.SQLException;
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16 import java.sql.SQLFeatureNotSupportedException;
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17
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18 /**
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19 * The MonetBlob class implements the {@link java.sql.Blob} interface. Because
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20 * MonetDB/SQL currently has no support for streams, this class is a
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21 * shallow wrapper of a byte[]. It is more or less supplied to
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22 * enable an application that depends on it to run. It may be obvious
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23 * that it is a real resource expensive workaround that contradicts the
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24 * benefits for a Blob: avoidance of huge resource consumption.
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25 *
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26 * @author Fabian Groffen
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27 */
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28 public class MonetBlob implements Blob {
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29 private byte[] buf;
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30
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31 protected MonetBlob(byte[] data) {
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32 buf = data;
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33 }
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34
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35 static MonetBlob create(String in) {
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36 // unpack the HEX (BLOB) notation to real bytes
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37 int len = in.length() / 2;
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38 byte[] buf = new byte[len];
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39 int offset;
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40 for (int i = 0; i < len; i++) {
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41 offset = 2 * i;
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42 buf[i] = (byte)Integer.parseInt(in.substring(offset, offset + 2), 16);
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43 }
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44 return new MonetBlob(buf);
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45 }
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46
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47 /* internal utility method */
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48 private void checkBufIsNotNull() throws SQLException {
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49 if (buf == null)
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50 throw new SQLException("This MonetBlob has been freed", "M1M20");
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51 }
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52
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53 //== begin interface Blob
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54
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55 /**
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56 * This method frees the Blob object and releases the resources that
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57 * it holds. The object is invalid once the free method is called.
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58 *
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59 * After free has been called, any attempt to invoke a method other
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60 * than free will result in a SQLException being thrown. If free is
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61 * called multiple times, the subsequent calls to free are treated
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62 * as a no-op.
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63 *
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64 * @throws SQLException if an error occurs releasing the Blob's
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65 * resources
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66 * @throws SQLFeatureNotSupportedException - if the JDBC driver does
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67 * not support this method
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68 */
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69 @Override
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70 public void free() throws SQLException {
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71 buf = null;
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72 }
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73
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74 /**
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75 * Retrieves the BLOB value designated by this Blob instance as a
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76 * stream.
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77 *
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78 * @return a stream containing the BLOB data
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79 * @throws SQLException if there is an error accessing the BLOB value
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80 * @throws SQLFeatureNotSupportedException if the JDBC driver does
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81 * not support this method
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82 */
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83 @Override
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84 public InputStream getBinaryStream() throws SQLException {
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85 checkBufIsNotNull();
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86 return new ByteArrayInputStream(buf);
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87 }
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88
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89 /**
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90 * Returns an InputStream object that contains a partial Blob value,
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91 * starting with the byte specified by pos, which is length bytes in
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92 * length.
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93 *
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94 * @param pos the offset to the first byte of the partial value to
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95 * be retrieved. The first byte in the Blob is at position 1
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96 * @param length the length in bytes of the partial value to be
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97 * retrieved
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98 * @return InputStream through which the partial Blob value can be
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99 * read.
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100 * @throws SQLException if pos is less than 1 or if pos is
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101 * greater than the number of bytes in the Blob or if pos +
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102 * length is greater than the number of bytes in the Blob
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103 * @throws SQLFeatureNotSupportedException if the JDBC driver does
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104 * not support this method
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105 */
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106 @Override
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107 public InputStream getBinaryStream(long pos, long length)
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108 throws SQLException
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109 {
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110 checkBufIsNotNull();
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111 if (pos < 1)
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112 throw new SQLException("pos is less than 1", "M1M05");
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113 if (pos - 1 > buf.length)
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114 throw new SQLException("pos is greater than the number of bytes in the Blob", "M1M05");
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115 if (pos - 1 + length > buf.length)
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116 throw new SQLException("pos + length is greater than the number of bytes in the Blob", "M1M05");
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117 return new ByteArrayInputStream(buf, (int)(pos - 1), (int)length);
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118 }
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119
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120 /**
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121 * Retrieves all or part of the BLOB value that this Blob object
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122 * represents, as an array of bytes. This byte array contains up to
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123 * length consecutive bytes starting at position pos.
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124 *
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125 * @param pos the ordinal position of the first byte in the BLOB
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126 * value to be extracted; the first byte is at position 1.
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127 * @param length the number of consecutive bytes to be copied
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128 * @return a byte array containing up to length consecutive bytes
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129 * from the BLOB value designated by this Blob object,
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130 * starting with the byte at position pos.
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131 * @throws SQLException if there is an error accessing the
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132 * BLOB value
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133 */
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134 @Override
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135 public byte[] getBytes(long pos, int length) throws SQLException {
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136 checkBufIsNotNull();
0
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137 try {
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138 return java.util.Arrays.copyOfRange(buf, (int) pos - 1, (int) pos - 1 + length);
0
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139 } catch (IndexOutOfBoundsException e) {
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140 throw new SQLException(e.getMessage(), "M0M10");
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141 }
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142 }
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143
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144 /**
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145 * Returns the number of bytes in the BLOB value designated by this
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146 * Blob object.
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147 *
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148 * @return length of the BLOB in bytes
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149 * @throws SQLException if there is an error accessing the length
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150 * of the BLOB value
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151 */
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152 @Override
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153 public long length() throws SQLException {
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154 checkBufIsNotNull();
0
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155 return (long)buf.length;
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156 }
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157
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158 /**
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159 * Retrieves the byte position in the BLOB value designated by this
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160 * Blob object at which pattern begins. The search begins at
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161 * position start.
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162 *
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163 * @param pattern the Blob object designating the BLOB value for
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164 * which to search
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165 * @param start the position in the BLOB value at which to begin
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166 * searching; the first position is 1
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167 * @return the position at which the pattern begins, else -1
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168 * @throws SQLException if there is an error accessing the
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169 * BLOB value
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170 */
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171 @Override
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172 public long position(Blob pattern, long start) throws SQLException {
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173 return position(pattern.getBytes(1L, (int)pattern.length()), start);
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174 }
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175
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176 /**
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177 * Retrieves the byte position at which the specified byte array
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178 * pattern begins within the BLOB value that this Blob object
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179 * represents. The search for pattern begins at position start.
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180 *
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181 * @param pattern the byte array for which to search
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182 * @param start the position at which to begin searching;
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183 * the first position is 1
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184 * @return the position at which the pattern appears, else -1
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185 * @throws SQLException if there is an error accessing the
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186 * BLOB value
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187 */
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188 @Override
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189 public long position(byte[] pattern, long start) throws SQLException {
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190 checkBufIsNotNull();
0
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191 try {
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192 for (int i = (int)(start - 1); i < buf.length - pattern.length; i++) {
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193 int j;
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194 for (j = 0; j < pattern.length; j++) {
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195 if (buf[i + j] != pattern[j])
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196 break;
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197 }
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198 if (j == pattern.length)
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199 return i;
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200 }
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201 } catch (IndexOutOfBoundsException e) {
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202 throw new SQLException(e.getMessage(), "M0M10");
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203 }
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204 return -1;
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205 }
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206
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207 /**
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208 * Retrieves a stream that can be used to write to the BLOB value
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209 * that this Blob object represents. The stream begins at position
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210 * pos. The bytes written to the stream will overwrite the existing
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211 * bytes in the Blob object starting at the position pos. If the end
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212 * of the Blob value is reached while writing to the stream, then
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213 * the length of the Blob value will be increased to accomodate the
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214 * extra bytes.
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215 *
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216 * @param pos the position in the BLOB value at which to start
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217 * writing; the first position is 1
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218 * @return a java.io.OutputStream object to which data can be
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219 * written
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220 * @throws SQLException if there is an error accessing the BLOB
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221 * value or if pos is less than 1
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222 * @throws SQLFeatureNotSupportedException if the JDBC driver does
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223 * not support this method
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224 */
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225 @Override
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226 public OutputStream setBinaryStream(long pos) throws SQLException {
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227 throw new SQLFeatureNotSupportedException("Method setBinaryStream(long pos) not supported", "0A000");
0
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228 }
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229
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230 /**
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231 * Writes the given array of bytes to the BLOB value that this Blob
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232 * object represents, starting at position pos, and returns the
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233 * number of bytes written.
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234 *
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235 * @param pos the position in the BLOB object at which to start
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236 * writing
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237 * @param bytes the array of bytes to be written to the BLOB value
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238 * that this Blob object represents
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239 * @return the number of bytes written
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240 * @throws SQLException if there is an error accessing the
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241 * BLOB value
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242 */
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243 @Override
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244 public int setBytes(long pos, byte[] bytes) throws SQLException {
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245 return setBytes(pos, bytes, 1, bytes.length);
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246 }
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247
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248 /**
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249 * Writes all or part of the given byte array to the BLOB value that
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250 * this Blob object represents and returns the number of bytes
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251 * written. Writing starts at position pos in the BLOB value; len
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252 * bytes from the given byte array are written.
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253 *
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254 * @param pos the position in the BLOB object at which to start
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255 * writing
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256 * @param bytes the array of bytes to be written to this BLOB
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257 * object
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258 * @param offset the offset into the array bytes at which to start
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259 * reading the bytes to be set
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260 * @param len the number of bytes to be written to the BLOB value
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261 * from the array of bytes bytes
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262 * @return the number of bytes written
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263 * @throws SQLException if there is an error accessing the
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264 * BLOB value
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265 */
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266 @Override
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267 public int setBytes(long pos, byte[] bytes, int offset, int len)
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268 throws SQLException
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269 {
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270 checkBufIsNotNull();
0
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271 try {
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272 /* transactions? what are you talking about? */
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273 for (int i = (int)pos; i < len; i++)
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274 buf[i] = bytes[offset - 1 + i];
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275 } catch (IndexOutOfBoundsException e) {
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276 throw new SQLException(e.getMessage(), "M0M10");
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277 }
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278 return len;
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279 }
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280
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281 /**
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282 * Truncates the BLOB value that this Blob object represents to be
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283 * len bytes in length.
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284 *
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285 * @param len the length, in bytes, to which the BLOB value
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286 * should be truncated
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287 * @throws SQLException if there is an error accessing the
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288 * BLOB value
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289 */
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290 @Override
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291 public void truncate(long len) throws SQLException {
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292 checkBufIsNotNull();
0
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293 if (buf.length > len) {
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294 byte[] newbuf = new byte[(int)len];
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295 for (int i = 0; i < len; i++)
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296 newbuf[i] = buf[i];
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297 buf = newbuf;
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298 }
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299 }
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300 }