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annotate src/main/java/org/monetdb/jdbc/MonetBlob.java @ 451:3dfcd06fd8ba

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Correcting typos in documentation text. Also improved the readability of the generated javadoc documents.
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 04 Mar 2021 18:57:51 +0100 (2021-03-04)
parents bf9f6b6ecf40
children 6aa38e8c0f2d
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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 - 2021 MonetDB B.V.
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7 */
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8
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9 package org.monetdb.jdbc;
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e092fa8d9ab7 Expand import java.*.* statements
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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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18 /**
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19 *<pre>
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20 * The MonetBlob class implements the {@link java.sql.Blob} interface.
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21 *
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22 * Because MonetDB/SQL currently has no support for streams, this class is a
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23 * shallow wrapper of a byte[]. It is more or less supplied to
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24 * enable an application that depends on it to run. It may be obvious
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25 * that it is a real resource expensive workaround that contradicts the
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26 * benefits for a Blob: avoidance of huge resource consumption.
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27 * <b>Use of this class is highly discouraged.</b>
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28 *</pre>
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29 *
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30 * @author Fabian Groffen
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31 */
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32 public final class MonetBlob implements Blob {
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33 private byte[] buf;
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34
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35 /* constructors */
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36 protected MonetBlob(final byte[] data) {
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37 buf = data;
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38 }
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39
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40 protected MonetBlob(final String hexString) {
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41 buf = hexStrToByteArray(hexString);
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42 }
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45 /* class utility methods */
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46 static final byte[] hexStrToByteArray(final String hexString) {
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47 // unpack the HEX (BLOB) notation to real bytes
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48 final int len = hexString.length() / 2;
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49 final byte[] buf = new byte[len];
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50 for (int i = 0; i < len; i++) {
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51 // was buf[i] = (byte)Integer.parseInt(hexString.substring(2 * i, (2 * i) + 2), 16);
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52 buf[i] = (byte) ((Character.digit(hexString.charAt(2 * i), 16) << 4)
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53 + Character.digit(hexString.charAt((2 * i) +1), 16));
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54 }
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55 return buf;
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56 }
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58 /* internal utility method */
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59 private final void checkBufIsNotNull() throws SQLException {
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60 if (buf == null)
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61 throw new SQLException("This MonetBlob has been freed", "M1M20");
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62 }
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64 //== begin interface Blob
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65
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66 /**
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67 * This method frees the Blob object and releases the resources that
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68 * it holds. The object is invalid once the free method is called.
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69 *
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70 * After free has been called, any attempt to invoke a method other
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71 * than free will result in a SQLException being thrown. If free is
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72 * called multiple times, the subsequent calls to free are treated
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73 * as a no-op.
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74 *
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75 * @throws SQLException if an error occurs releasing the Blob's resources
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76 */
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77 @Override
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78 public void free() throws SQLException {
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79 buf = null;
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80 }
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81
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82 /**
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83 * Retrieves the BLOB value designated by this Blob instance as a stream.
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84 *
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85 * @return a stream containing the BLOB data
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86 * @throws SQLException if there is an error accessing the BLOB value
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87 */
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88 @Override
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89 public InputStream getBinaryStream() throws SQLException {
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90 checkBufIsNotNull();
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91 return new ByteArrayInputStream(buf);
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92 }
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93
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94 /**
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95 * Returns an InputStream object that contains a partial Blob value,
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96 * starting with the byte specified by pos, which is length bytes in
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97 * length.
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98 *
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99 * @param pos the offset to the first byte of the partial value to
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100 * be retrieved. The first byte in the Blob is at position 1
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101 * @param length the length in bytes of the partial value to be retrieved
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102 * @return InputStream through which the partial Blob value can be read.
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103 * @throws SQLException if pos is less than 1 or if pos is
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104 * greater than the number of bytes in the Blob or if pos +
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105 * length is greater than the number of bytes in the Blob
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106 */
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107 @Override
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108 public InputStream getBinaryStream(final long pos, final long length)
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109 throws SQLException
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110 {
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111 checkBufIsNotNull();
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112 if (pos < 1 || pos > buf.length) {
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113 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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114 }
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115 if (length < 0 || pos - 1 + length > buf.length) {
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116 throw new SQLException("Invalid length value: " + length, "M1M05");
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117 }
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118 return new ByteArrayInputStream(buf, (int) pos - 1, (int) length);
0
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119 }
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120
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121 /**
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122 * Retrieves all or part of the BLOB value that this Blob object
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123 * represents, as an array of bytes. This byte array contains up to
0
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124 * length consecutive bytes starting at position pos.
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125 *
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126 * @param pos the ordinal position of the first byte in the BLOB
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127 * value to be extracted; the first byte is at position 1.
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128 * @param length the number of consecutive bytes to be copied
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129 * @return a byte array containing up to length consecutive bytes
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130 * from the BLOB value designated by this Blob object,
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131 * starting with the byte at position pos.
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132 * @throws SQLException if there is an error accessing the BLOB value
0
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133 */
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134 @Override
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135 public byte[] getBytes(final long pos, final int length) throws SQLException {
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136 checkBufIsNotNull();
209
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137 if (pos < 1 || pos > buf.length) {
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138 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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139 }
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140 if (length < 0 || pos - 1 + length > buf.length) {
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141 throw new SQLException("Invalid length value: " + length, "M1M05");
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142 }
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143
0
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144 try {
150
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145 return java.util.Arrays.copyOfRange(buf, (int) pos - 1, (int) pos - 1 + length);
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146 } catch (IndexOutOfBoundsException e) {
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147 throw new SQLException(e.getMessage(), "M0M10");
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148 }
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149 }
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150
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151 /**
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152 * Returns the number of bytes in the BLOB value designated by this
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153 * Blob object.
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154 *
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155 * @return length of the BLOB in bytes
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156 * @throws SQLException if there is an error accessing the length
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157 * of the BLOB value
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158 */
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159 @Override
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160 public long length() throws SQLException {
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161 checkBufIsNotNull();
0
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162 return (long)buf.length;
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163 }
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164
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165 /**
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166 * Retrieves the byte position in the BLOB value designated by this
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167 * Blob object at which pattern begins. The search begins at position start.
0
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168 *
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169 * @param pattern the Blob object designating the BLOB value for
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170 * which to search
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171 * @param start the position in the BLOB value at which to begin
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172 * searching; the first position is 1
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173 * @return the position at which the pattern begins, else -1
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174 * @throws SQLException if there is an error accessing the BLOB value
0
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175 */
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176 @Override
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177 public long position(final Blob pattern, final long start) throws SQLException {
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178 if (pattern == null) {
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179 throw new SQLException("Missing pattern object", "M1M05");
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180 }
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181 // buf and input argument start will be checked in method position(byte{}, long)
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182 return position(pattern.getBytes(1L, (int)pattern.length()), start);
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183 }
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184
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185 /**
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186 * Retrieves the byte position at which the specified byte array
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187 * pattern begins within the BLOB value that this Blob object
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188 * represents. The search for pattern begins at position start.
0
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189 *
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190 * @param pattern the byte array for which to search
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191 * @param start the position at which to begin searching;
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192 * the first position is 1
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193 * @return the position at which the pattern appears, else -1
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194 * @throws SQLException if there is an error accessing the BLOB value
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195 */
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196 @Override
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197 public long position(final byte[] pattern, final long start) throws SQLException {
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198 checkBufIsNotNull();
209
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199 if (pattern == null) {
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200 throw new SQLException("Missing pattern object", "M1M05");
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201 }
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202 if (start < 1 || start > buf.length) {
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203 throw new SQLException("Invalid start value: " + start, "M1M05");
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204 }
0
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205 try {
209
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206 final int patternLength = pattern.length;
316
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207 final int maxPos = buf.length - patternLength;
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208 for (int i = (int)(start - 1); i < maxPos; i++) {
0
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209 int j;
209
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210 for (j = 0; j < patternLength; j++) {
0
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211 if (buf[i + j] != pattern[j])
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212 break;
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213 }
209
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214 if (j == patternLength)
316
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215 // found a match
0
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216 return i;
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217 }
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218 } catch (IndexOutOfBoundsException e) {
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219 throw new SQLException(e.getMessage(), "M0M10");
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220 }
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221 return -1;
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222 }
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223
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224 /**
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225 * Retrieves a stream that can be used to write to the BLOB value
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226 * that this Blob object represents. The stream begins at position
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227 * pos. The bytes written to the stream will overwrite the existing
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228 * bytes in the Blob object starting at the position pos. If the end
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229 * of the Blob value is reached while writing to the stream, then
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230 * the length of the Blob value will be increased to accomodate the
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231 * extra bytes.
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232 *
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233 * @param pos the position in the BLOB value at which to start
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234 * writing; the first position is 1
295
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235 * @return a java.io.OutputStream object to which data can be written
0
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236 * @throws SQLException if there is an error accessing the BLOB
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237 * value or if pos is less than 1
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238 * @throws SQLFeatureNotSupportedException if the JDBC driver does
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239 * not support this method
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240 */
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241 @Override
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242 public OutputStream setBinaryStream(final long pos) throws SQLException {
262
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243 throw MonetWrapper.newSQLFeatureNotSupportedException("setBinaryStream");
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244 }
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245
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246 /**
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247 * Writes the given array of bytes to the BLOB value that this Blob
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248 * object represents, starting at position pos, and returns the
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249 * number of bytes written.
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250 *
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251 * @param pos the position in the BLOB object at which to start writing
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252 * @param bytes the array of bytes to be written to the BLOB value
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253 * that this Blob object represents
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254 * @return the number of bytes written
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255 * @throws SQLException if there is an error accessing the
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256 * BLOB value or if pos is less than 1
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257 */
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258 @Override
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259 public int setBytes(final long pos, final byte[] bytes) throws SQLException {
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260 // buf and input arguments will be checked in method setBytes(long, byte{}, int, int)
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261 final int len = (bytes != null) ? bytes.length : 0;
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262 return setBytes(pos, bytes, 1, len);
0
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263 }
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264
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265 /**
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266 * Writes all or part of the given byte array to the BLOB value that
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267 * this Blob object represents and returns the number of bytes written.
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268 * Writing starts at position pos in the BLOB value; len bytes from
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269 * the given byte array are written.
0
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270 *
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271 * @param pos the position in the BLOB object at which to start writing
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272 * @param bytes the array of bytes to be written to this BLOB object
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273 * @param offset the offset into the array bytes at which to start
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274 * reading the bytes to be set
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275 * @param len the number of bytes to be written to the BLOB value
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276 * from the array of bytes bytes
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277 * @return the number of bytes written
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278 * @throws SQLException if there is an error accessing the
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279 * BLOB value or if pos is less than 1
0
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280 */
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281 @Override
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282 public int setBytes(final long pos, final byte[] bytes, int offset, final int len)
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283 throws SQLException
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284 {
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285 checkBufIsNotNull();
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286 if (bytes == null) {
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287 throw new SQLException("Missing bytes[] object", "M1M05");
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288 }
316
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289 if (pos < 1 || pos > buf.length) {
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290 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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291 }
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292 if (len < 0 || pos + len > buf.length) {
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293 throw new SQLException("Invalid len value: " + len, "M1M05");
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294 }
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295 if (offset < 0 || offset > bytes.length) {
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296 throw new SQLException("Invalid offset value: " + offset, "M1M05");
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297 }
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298
0
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299 try {
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300 offset--;
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301 /* transactions? what are you talking about? */
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302 for (int i = (int)pos; i < len; i++)
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303 buf[i] = bytes[offset + i];
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304 } catch (IndexOutOfBoundsException e) {
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305 throw new SQLException(e.getMessage(), "M0M10");
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306 }
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307 return len;
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308 }
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309
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310 /**
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311 * Truncates the BLOB value that this Blob object represents to be
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312 * len bytes in length.
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313 *
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314 * @param len the length, in bytes, to which the BLOB value
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315 * should be truncated
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316 * @throws SQLException if there is an error accessing the BLOB value
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317 */
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318 @Override
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319 public void truncate(final long len) throws SQLException {
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320 checkBufIsNotNull();
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321 if (len < 0 || len > buf.length) {
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322 throw new SQLException("Invalid len value: " + len, "M1M05");
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323 }
0
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324 if (buf.length > len) {
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325 buf = java.util.Arrays.copyOf(buf, (int)len);
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326 }
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327 }
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328 }