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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetBlob.java @ 295:003ae6d881db

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Add "final" keyword to method arguments and local variables where possible. It discovered some bugs in the MonetStatement constructor (changed the argument instead of object variable) which are fixed now. See also https://en.wikipedia.org/wiki/Final_(Java)
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 01 Aug 2019 20:18:43 +0200 (2019-08-01)
parents eefa7f625673
children d479475888e3
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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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d4baf8a4b43a Update Copyright year to 2019
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2019 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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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 * 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(final byte[] data) {
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34 buf = data;
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35 }
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37 final static MonetBlob create(final String in) {
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38 // unpack the HEX (BLOB) notation to real bytes
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39 final int len = in.length() / 2;
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40 final 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 resources
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67 */
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68 @Override
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69 public void free() throws SQLException {
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70 buf = null;
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71 }
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72
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73 /**
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74 * Retrieves the BLOB value designated by this Blob instance as a stream.
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75 *
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76 * @return a stream containing the BLOB data
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77 * @throws SQLException if there is an error accessing the BLOB value
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78 */
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79 @Override
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80 public InputStream getBinaryStream() throws SQLException {
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81 checkBufIsNotNull();
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82 return new ByteArrayInputStream(buf);
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83 }
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84
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85 /**
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86 * Returns an InputStream object that contains a partial Blob value,
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87 * starting with the byte specified by pos, which is length bytes in
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88 * length.
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89 *
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90 * @param pos the offset to the first byte of the partial value to
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91 * be retrieved. The first byte in the Blob is at position 1
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92 * @param length the length in bytes of the partial value to be retrieved
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93 * @return InputStream through which the partial Blob value can be read.
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94 * @throws SQLException if pos is less than 1 or if pos is
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95 * greater than the number of bytes in the Blob or if pos +
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96 * length is greater than the number of bytes in the Blob
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97 */
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98 @Override
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99 public InputStream getBinaryStream(final long pos, final long length)
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100 throws SQLException
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101 {
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102 checkBufIsNotNull();
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103 if (pos < 1 || pos > buf.length) {
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104 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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105 }
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106 if (length < 0 || pos - 1 + length > buf.length) {
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107 throw new SQLException("Invalid length value: " + length, "M1M05");
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108 }
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110 return new ByteArrayInputStream(buf, (int) pos - 1, (int) length);
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111 }
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112
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113 /**
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114 * Retrieves all or part of the BLOB value that this Blob object
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115 * represents, as an array of bytes. This byte array contains up to
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116 * length consecutive bytes starting at position pos.
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117 *
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118 * @param pos the ordinal position of the first byte in the BLOB
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119 * value to be extracted; the first byte is at position 1.
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120 * @param length the number of consecutive bytes to be copied
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121 * @return a byte array containing up to length consecutive bytes
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122 * from the BLOB value designated by this Blob object,
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123 * starting with the byte at position pos.
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124 * @throws SQLException if there is an error accessing the BLOB value
0
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125 */
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126 @Override
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127 public byte[] getBytes(final long pos, final int length) throws SQLException {
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128 checkBufIsNotNull();
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129 if (pos < 1 || pos > buf.length) {
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130 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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131 }
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132 if (length < 0 || pos - 1 + length > buf.length) {
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133 throw new SQLException("Invalid length value: " + length, "M1M05");
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134 }
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135
0
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136 try {
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137 return java.util.Arrays.copyOfRange(buf, (int) pos - 1, (int) pos - 1 + length);
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138 } catch (IndexOutOfBoundsException e) {
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139 throw new SQLException(e.getMessage(), "M0M10");
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140 }
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141 }
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142
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143 /**
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144 * Returns the number of bytes in the BLOB value designated by this
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145 * Blob object.
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146 *
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147 * @return length of the BLOB in bytes
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148 * @throws SQLException if there is an error accessing the length
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149 * of the BLOB value
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150 */
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151 @Override
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152 public long length() throws SQLException {
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153 checkBufIsNotNull();
0
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154 return (long)buf.length;
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155 }
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156
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157 /**
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158 * Retrieves the byte position in the BLOB value designated by this
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159 * Blob object at which pattern begins. The search begins at position start.
0
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160 *
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161 * @param pattern the Blob object designating the BLOB value for
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162 * which to search
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163 * @param start the position in the BLOB value at which to begin
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164 * searching; the first position is 1
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165 * @return the position at which the pattern begins, else -1
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166 * @throws SQLException if there is an error accessing the BLOB value
0
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167 */
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168 @Override
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169 public long position(final Blob pattern, final long start) throws SQLException {
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170 if (pattern == null) {
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171 throw new SQLException("Missing pattern object", "M1M05");
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172 }
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173 // buf and input argument start will be checked in method position(byte{}, long)
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174 return position(pattern.getBytes(1L, (int)pattern.length()), start);
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175 }
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176
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177 /**
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178 * Retrieves the byte position at which the specified byte array
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179 * pattern begins within the BLOB value that this Blob object
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180 * represents. The search for pattern begins at position start.
0
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181 *
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182 * @param pattern the byte array for which to search
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183 * @param start the position at which to begin searching;
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184 * the first position is 1
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185 * @return the position at which the pattern appears, else -1
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186 * @throws SQLException if there is an error accessing the BLOB value
0
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187 */
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188 @Override
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189 public long position(final byte[] pattern, final long start) throws SQLException {
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190 checkBufIsNotNull();
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191 if (pattern == null) {
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192 throw new SQLException("Missing pattern object", "M1M05");
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193 }
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194 if (start < 1 || start > buf.length) {
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195 throw new SQLException("Invalid start value: " + start, "M1M05");
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196 }
0
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197 try {
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198 final int patternLength = pattern.length;
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199 final int bufLength = buf.length;
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200 for (int i = (int)(start - 1); i < bufLength - patternLength; i++) {
0
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201 int j;
209
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202 for (j = 0; j < patternLength; j++) {
0
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203 if (buf[i + j] != pattern[j])
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204 break;
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205 }
209
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206 if (j == patternLength)
0
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207 return i;
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208 }
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209 } catch (IndexOutOfBoundsException e) {
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210 throw new SQLException(e.getMessage(), "M0M10");
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211 }
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212 return -1;
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213 }
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214
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215 /**
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216 * Retrieves a stream that can be used to write to the BLOB value
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217 * that this Blob object represents. The stream begins at position
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218 * pos. The bytes written to the stream will overwrite the existing
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219 * bytes in the Blob object starting at the position pos. If the end
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220 * of the Blob value is reached while writing to the stream, then
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221 * the length of the Blob value will be increased to accomodate the
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222 * extra bytes.
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223 *
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224 * @param pos the position in the BLOB value at which to start
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225 * writing; the first position is 1
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226 * @return a java.io.OutputStream object to which data can be written
0
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227 * @throws SQLException if there is an error accessing the BLOB
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228 * value or if pos is less than 1
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229 * @throws SQLFeatureNotSupportedException if the JDBC driver does
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230 * not support this method
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231 */
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232 @Override
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233 public OutputStream setBinaryStream(final long pos) throws SQLException {
262
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234 throw MonetWrapper.newSQLFeatureNotSupportedException("setBinaryStream");
0
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235 }
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236
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237 /**
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238 * Writes the given array of bytes to the BLOB value that this Blob
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239 * object represents, starting at position pos, and returns the
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240 * number of bytes written.
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241 *
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242 * @param pos the position in the BLOB object at which to start writing
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243 * @param bytes the array of bytes to be written to the BLOB value
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244 * that this Blob object represents
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245 * @return the number of bytes written
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246 * @throws SQLException if there is an error accessing the
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247 * BLOB value or if pos is less than 1
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248 */
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249 @Override
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250 public int setBytes(final long pos, final byte[] bytes) throws SQLException {
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251 if (bytes == null) {
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252 throw new SQLException("Missing bytes[] object", "M1M05");
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253 }
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254 // buf and input argument pos will be checked in method setBytes(long, byte{}, int, int)
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255 return setBytes(pos, bytes, 1, bytes.length);
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256 }
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257
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258 /**
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259 * Writes all or part of the given byte array to the BLOB value that
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260 * this Blob object represents and returns the number of bytes written.
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261 * Writing starts at position pos in the BLOB value; len bytes from
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262 * the given byte array are written.
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263 *
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264 * @param pos the position in the BLOB object at which to start writing
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265 * @param bytes the array of bytes to be written to this BLOB object
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266 * @param offset the offset into the array bytes at which to start
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267 * reading the bytes to be set
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268 * @param len the number of bytes to be written to the BLOB value
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269 * from the array of bytes bytes
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270 * @return the number of bytes written
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271 * @throws SQLException if there is an error accessing the
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272 * BLOB value or if pos is less than 1
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273 */
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274 @Override
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275 public int setBytes(final long pos, final byte[] bytes, final int offset, final int len)
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276 throws SQLException
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277 {
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278 checkBufIsNotNull();
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279 if (bytes == null) {
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280 throw new SQLException("Missing bytes[] object", "M1M05");
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281 }
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282 if (pos < 1 || pos > Integer.MAX_VALUE) {
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283 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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284 }
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285 if (len < 0 || pos + len > buf.length) {
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286 throw new SQLException("Invalid len value: " + len, "M1M05");
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287 }
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288 if (offset < 0 || offset > bytes.length) {
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289 throw new SQLException("Invalid offset value: " + offset, "M1M05");
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290 }
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291
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292 try {
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293 /* transactions? what are you talking about? */
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294 for (int i = (int)pos; i < len; i++)
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295 buf[i] = bytes[offset - 1 + i];
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296 } catch (IndexOutOfBoundsException e) {
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297 throw new SQLException(e.getMessage(), "M0M10");
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298 }
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299 return len;
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300 }
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301
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302 /**
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303 * Truncates the BLOB value that this Blob object represents to be
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304 * len bytes in length.
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305 *
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306 * @param len the length, in bytes, to which the BLOB value
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307 * should be truncated
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308 * @throws SQLException if there is an error accessing the BLOB value
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309 */
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310 @Override
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311 public void truncate(final long len) throws SQLException {
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312 checkBufIsNotNull();
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313 if (len < 0 || len > buf.length) {
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314 throw new SQLException("Invalid len value: " + len, "M1M05");
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315 }
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316 if (buf.length > len) {
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317 final byte[] newbuf = new byte[(int)len];
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318 for (int i = 0; i < len; i++)
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319 newbuf[i] = buf[i];
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320 buf = newbuf;
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321 }
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322 }
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323 }