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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetBlob.java @ 209:94131372ad0b

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Improved implementation of MonetClob and MonetBlob classes by adding checks on validity of input parameters of methods of those classes. This makes them more robust against incorrect usage by throwing an SQLException instead of a NullPointerException or other Exception. Also made these classes final, as we do not want anybody to subclass these classes.
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 08 Mar 2018 18:16:05 +0100 (2018-03-08)
parents c38d4eaf5479
children 51e886d7f3b4 d4baf8a4b43a
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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 - 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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18 /**
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19 * The MonetBlob class implements the {@link java.sql.Blob} interface.
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20 *
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21 * Because MonetDB/SQL currently has no support for streams, this class is a
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22 * shallow wrapper of a byte[]. It is more or less supplied to
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23 * enable an application that depends on it to run. It may be obvious
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24 * that it is a real resource expensive workaround that contradicts the
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25 * benefits for a Blob: avoidance of huge resource consumption.
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26 * <b>Use of this class is highly discouraged.</b>
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27 *
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28 * @author Fabian Groffen
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29 */
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30 public final class MonetBlob implements Blob {
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31 private byte[] buf;
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32
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33 protected MonetBlob(byte[] data) {
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34 buf = data;
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35 }
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37 static MonetBlob create(String in) {
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38 // unpack the HEX (BLOB) notation to real bytes
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39 int len = in.length() / 2;
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40 byte[] buf = new byte[len];
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41 int offset;
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42 for (int i = 0; i < len; i++) {
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43 offset = 2 * i;
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44 buf[i] = (byte)Integer.parseInt(in.substring(offset, offset + 2), 16);
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45 }
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46 return new MonetBlob(buf);
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47 }
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49 /* internal utility method */
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50 final private void checkBufIsNotNull() throws SQLException {
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51 if (buf == null)
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52 throw new SQLException("This MonetBlob has been freed", "M1M20");
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53 }
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55 //== begin interface Blob
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56
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57 /**
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58 * This method frees the Blob object and releases the resources that
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59 * it holds. The object is invalid once the free method is called.
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60 *
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61 * After free has been called, any attempt to invoke a method other
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62 * than free will result in a SQLException being thrown. If free is
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63 * called multiple times, the subsequent calls to free are treated
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64 * as a no-op.
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65 *
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66 * @throws SQLException if an error occurs releasing the Blob's
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67 * resources
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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 */
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81 @Override
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82 public InputStream getBinaryStream() throws SQLException {
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83 checkBufIsNotNull();
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84 return new ByteArrayInputStream(buf);
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85 }
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86
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87 /**
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88 * Returns an InputStream object that contains a partial Blob value,
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89 * starting with the byte specified by pos, which is length bytes in
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90 * length.
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91 *
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92 * @param pos the offset to the first byte of the partial value to
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93 * be retrieved. The first byte in the Blob is at position 1
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94 * @param length the length in bytes of the partial value to be
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95 * retrieved
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96 * @return InputStream through which the partial Blob value can be
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97 * read.
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98 * @throws SQLException if pos is less than 1 or if pos is
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99 * greater than the number of bytes in the Blob or if pos +
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100 * length is greater than the number of bytes in the Blob
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101 */
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102 @Override
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103 public InputStream getBinaryStream(long pos, long length)
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104 throws SQLException
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105 {
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106 checkBufIsNotNull();
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107 if (pos < 1 || pos > buf.length) {
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108 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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109 }
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110 if (length < 0 || pos - 1 + length > buf.length) {
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111 throw new SQLException("Invalid length value: " + length, "M1M05");
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112 }
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114 return new ByteArrayInputStream(buf, (int) pos - 1, (int) length);
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115 }
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116
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117 /**
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118 * Retrieves all or part of the BLOB value that this Blob object
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119 * represents, as an array of bytes. This byte array contains up to
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120 * length consecutive bytes starting at position pos.
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121 *
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122 * @param pos the ordinal position of the first byte in the BLOB
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123 * value to be extracted; the first byte is at position 1.
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124 * @param length the number of consecutive bytes to be copied
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125 * @return a byte array containing up to length consecutive bytes
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126 * from the BLOB value designated by this Blob object,
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127 * starting with the byte at position pos.
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128 * @throws SQLException if there is an error accessing the
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129 * BLOB value
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130 */
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131 @Override
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132 public byte[] getBytes(long pos, int length) throws SQLException {
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133 checkBufIsNotNull();
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134 if (pos < 1 || pos > buf.length) {
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135 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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136 }
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137 if (length < 0 || pos - 1 + length > buf.length) {
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138 throw new SQLException("Invalid length value: " + length, "M1M05");
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139 }
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140
0
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141 try {
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142 return java.util.Arrays.copyOfRange(buf, (int) pos - 1, (int) pos - 1 + length);
0
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143 } catch (IndexOutOfBoundsException e) {
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144 throw new SQLException(e.getMessage(), "M0M10");
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145 }
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146 }
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147
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148 /**
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149 * Returns the number of bytes in the BLOB value designated by this
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150 * Blob object.
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151 *
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152 * @return length of the BLOB in bytes
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153 * @throws SQLException if there is an error accessing the length
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154 * of the BLOB value
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155 */
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156 @Override
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157 public long length() throws SQLException {
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158 checkBufIsNotNull();
0
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159 return (long)buf.length;
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160 }
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161
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162 /**
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163 * Retrieves the byte position in the BLOB value designated by this
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164 * Blob object at which pattern begins. The search begins at
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165 * position start.
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166 *
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167 * @param pattern the Blob object designating the BLOB value for
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168 * which to search
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169 * @param start the position in the BLOB value at which to begin
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170 * searching; the first position is 1
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171 * @return the position at which the pattern begins, else -1
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172 * @throws SQLException if there is an error accessing the
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173 * BLOB value
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174 */
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175 @Override
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176 public long position(Blob pattern, long start) throws SQLException {
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177 if (pattern == null) {
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178 throw new SQLException("Missing pattern object", "M1M05");
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179 }
0
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180 return position(pattern.getBytes(1L, (int)pattern.length()), start);
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181 }
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182
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183 /**
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184 * Retrieves the byte position at which the specified byte array
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185 * pattern begins within the BLOB value that this Blob object
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186 * represents. The search for pattern begins at position start.
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187 *
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188 * @param pattern the byte array for which to search
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189 * @param start the position at which to begin searching;
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190 * the first position is 1
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191 * @return the position at which the pattern appears, else -1
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192 * @throws SQLException if there is an error accessing the
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193 * BLOB value
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194 */
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195 @Override
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196 public long position(byte[] pattern, long start) throws SQLException {
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197 checkBufIsNotNull();
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198 if (pattern == null) {
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199 throw new SQLException("Missing pattern object", "M1M05");
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200 }
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201 if (start < 1 || start > buf.length) {
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202 throw new SQLException("Invalid start value: " + start, "M1M05");
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203 }
0
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204 try {
209
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205 final int patternLength = pattern.length;
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206 final int bufLength = buf.length;
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207 for (int i = (int)(start - 1); i < bufLength - patternLength; i++) {
0
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208 int j;
209
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209 for (j = 0; j < patternLength; j++) {
0
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210 if (buf[i + j] != pattern[j])
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211 break;
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212 }
209
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213 if (j == patternLength)
0
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214 return i;
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215 }
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216 } catch (IndexOutOfBoundsException e) {
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217 throw new SQLException(e.getMessage(), "M0M10");
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218 }
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219 return -1;
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220 }
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221
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222 /**
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223 * Retrieves a stream that can be used to write to the BLOB value
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224 * that this Blob object represents. The stream begins at position
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225 * pos. The bytes written to the stream will overwrite the existing
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226 * bytes in the Blob object starting at the position pos. If the end
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227 * of the Blob value is reached while writing to the stream, then
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228 * the length of the Blob value will be increased to accomodate the
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229 * extra bytes.
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230 *
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231 * @param pos the position in the BLOB value at which to start
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232 * writing; the first position is 1
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233 * @return a java.io.OutputStream object to which data can be
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234 * written
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235 * @throws SQLException if there is an error accessing the BLOB
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236 * value or if pos is less than 1
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237 * @throws SQLFeatureNotSupportedException if the JDBC driver does
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238 * not support this method
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239 */
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240 @Override
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241 public OutputStream setBinaryStream(long pos) throws SQLException {
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242 throw new SQLFeatureNotSupportedException("Method setBinaryStream(long pos) not supported", "0A000");
0
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243 }
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244
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245 /**
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246 * Writes the given array of bytes to the BLOB value that this Blob
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247 * object represents, starting at position pos, and returns the
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248 * number of bytes written.
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249 *
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250 * @param pos the position in the BLOB object at which to start
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251 * 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
0
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257 */
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258 @Override
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259 public int setBytes(long pos, byte[] bytes) throws SQLException {
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260 if (bytes == null) {
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261 throw new SQLException("Missing bytes[] object", "M1M05");
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262 }
0
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263 return setBytes(pos, bytes, 1, bytes.length);
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264 }
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265
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266 /**
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267 * Writes all or part of the given byte array to the BLOB value that
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268 * this Blob object represents and returns the number of bytes
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269 * written. Writing starts at position pos in the BLOB value; len
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270 * bytes from the given byte array are written.
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271 *
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272 * @param pos the position in the BLOB object at which to start
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273 * writing
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274 * @param bytes the array of bytes to be written to this BLOB
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275 * object
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276 * @param offset the offset into the array bytes at which to start
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277 * reading the bytes to be set
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278 * @param len the number of bytes to be written to the BLOB value
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279 * from the array of bytes bytes
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280 * @return the number of bytes written
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281 * @throws SQLException if there is an error accessing the
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282 * BLOB value or if pos is less than 1
0
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283 */
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284 @Override
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285 public int setBytes(long pos, byte[] bytes, int offset, int len)
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286 throws SQLException
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287 {
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288 checkBufIsNotNull();
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289 if (bytes == null) {
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290 throw new SQLException("Missing bytes[] object", "M1M05");
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291 }
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292 if (pos < 1 || pos > Integer.MAX_VALUE) {
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293 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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294 }
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295 if (len < 0 || pos + len > buf.length) {
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296 throw new SQLException("Invalid len value: " + len, "M1M05");
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297 }
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298 if (offset < 0 || offset > bytes.length) {
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299 throw new SQLException("Invalid offset value: " + offset, "M1M05");
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300 }
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301
0
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302 try {
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303 /* transactions? what are you talking about? */
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304 for (int i = (int)pos; i < len; i++)
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305 buf[i] = bytes[offset - 1 + i];
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306 } catch (IndexOutOfBoundsException e) {
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307 throw new SQLException(e.getMessage(), "M0M10");
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308 }
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309 return len;
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310 }
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311
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312 /**
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313 * Truncates the BLOB value that this Blob object represents to be
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314 * len bytes in length.
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315 *
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316 * @param len the length, in bytes, to which the BLOB value
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317 * should be truncated
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318 * @throws SQLException if there is an error accessing the
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319 * BLOB value
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320 */
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321 @Override
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322 public void truncate(long len) throws SQLException {
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323 checkBufIsNotNull();
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324 if (len < 0 || len > buf.length) {
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325 throw new SQLException("Invalid len value: " + len, "M1M05");
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326 }
0
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327 if (buf.length > len) {
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328 byte[] newbuf = new byte[(int)len];
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329 for (int i = 0; i < len; i++)
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330 newbuf[i] = buf[i];
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331 buf = newbuf;
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332 }
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333 }
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334 }