Mercurial > hg > monetdb-java

annotate src/main/java/nl/cwi/monetdb/jdbc/MonetBlob.java @ 102:08bc9009d190 embedded

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Merged with default
author Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
date Fri, 13 Jan 2017 18:16:30 +0100 (2017-01-13)
parents 6f74e01c57da b9b35ca2eec2
children 60063c67f9e7
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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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b9b35ca2eec2 Updated copyright year to 2017 in *.java files and MonetDriver.java.in and build.xml and version.sh
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2017 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.io.Serializable;
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15 import java.sql.Blob;
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16 import java.sql.SQLException;
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17 import java.sql.SQLFeatureNotSupportedException;
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18 import java.util.Arrays;
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19
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20 /**
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21 * The MonetBlob class implements the {@link java.sql.Blob} interface. Because
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22 * 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 *
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28 * @author Fabian Groffen
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29 */
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30 public class MonetBlob implements Blob, Serializable, Comparable<MonetBlob> {
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32 private byte[] buffer;
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34 public MonetBlob(byte[] buf) {
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35 this.buffer = buf;
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36 }
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38 public byte[] getBuffer() {
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39 return buffer;
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40 }
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42 //== begin interface Blob
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0
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44 /**
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45 * This method frees the Blob object and releases the resources that it holds. The object is invalid once the
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46 * free method is called.
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47 *
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48 * After free has been called, any attempt to invoke a method other than free will result in a SQLException being
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49 * thrown. If free is called multiple times, the subsequent calls to free are treated as a no-op.
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50 */
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51 @Override
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52 public void free() throws SQLException {
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53 buffer = null;
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54 }
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0
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56 /**
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57 * Retrieves the BLOB value designated by this Blob instance as a stream.
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58 *
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59 * @return a stream containing the BLOB data
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60 * @throws SQLException if there is an error accessing the BLOB value
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61 */
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62 @Override
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63 public InputStream getBinaryStream() throws SQLException {
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64 if (buffer == null)
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65 throw new SQLException("This Blob object has been freed", "M1M20");
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66 return new ByteArrayInputStream(buffer);
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67 }
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69 /**
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70 * Returns an InputStream object that contains a partial Blob value, starting with the byte specified by pos,
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71 * which is length bytes in length.
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72 *
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73 * @param pos the offset to the first byte of the partial value to be retrieved. The first byte in the Blob is at
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74 * position 1
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75 * @param length the length in bytes of the partial value to be retrieved
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76 * @return InputStream through which the partial Blob value can be read.
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77 * @throws SQLException if pos is less than 1 or if pos is greater than the number of bytes in the Blob or if pos +
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78 * length is greater than the number of bytes in the Blob
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79 */
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80 @Override
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81 public InputStream getBinaryStream(long pos, long length) throws SQLException {
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82 if (buffer == null)
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83 throw new SQLException("This Blob object has been freed", "M1M20");
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84 if (pos < 1)
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85 throw new SQLException("pos is less than 1", "M1M05");
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86 if (pos - 1 > buffer.length)
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87 throw new SQLException("pos is greater than the number of bytes in the Blob", "M1M05");
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88 if (pos - 1 + length > buffer.length)
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89 throw new SQLException("pos + length is greater than the number of bytes in the Blob", "M1M05");
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90 return new ByteArrayInputStream(buffer, (int)(pos - 1), (int)length);
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91 }
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92
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93 /**
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94 * Retrieves all or part of the BLOB value that this Blob object represents, as an array of bytes. This byte array
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95 * contains up to length consecutive bytes starting at position pos.
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96 *
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97 * @param pos the ordinal position of the first byte in the BLOB value to be extracted; the first byte is at
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98 * position 1.
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99 * @param length the number of consecutive bytes to be copied
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100 * @return a byte array containing up to length consecutive bytes from the BLOB value designated by this Blob
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101 * object, starting with the byte at position pos.
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102 * @throws SQLException if there is an error accessing the BLOB value
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103 */
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104 @Override
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105 public byte[] getBytes(long pos, int length) throws SQLException {
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106 if (buffer == null)
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107 throw new SQLException("This Blob object has been freed", "M1M20");
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108 try {
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109 return Arrays.copyOfRange(buffer, (int) pos - 1, (int) pos - 1 + length);
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110 } catch (IndexOutOfBoundsException e) {
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111 throw new SQLException(e.getMessage(), "M0M10");
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112 }
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113 }
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114
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115 /**
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116 * Returns the number of bytes in the BLOB value designated by this Blob object.
0
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117 *
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118 * @return length of the BLOB in bytes
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119 * @throws SQLException if there is an error accessing the length of the BLOB value
0
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120 */
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121 @Override
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122 public long length() throws SQLException {
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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123 if (buffer == null)
0
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124 throw new SQLException("This Blob object has been freed", "M1M20");
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125 return (long) buffer.length;
0
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126 }
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127
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128 /**
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129 * Retrieves the byte position in the BLOB value designated by this Blob object at which pattern begins. The search
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130 * begins at position start.
0
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131 *
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132 * @param pattern the Blob object designating the BLOB value for which to search
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133 * @param start the position in the BLOB value at which to begin searching; the first position is 1
0
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134 * @return the position at which the pattern begins, else -1
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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135 * @throws SQLException if there is an error accessing the BLOB value
0
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136 */
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137 @Override
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138 public long position(Blob pattern, long start) throws SQLException {
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139 return position(pattern.getBytes(1L, (int)pattern.length()), start);
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140 }
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141
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142 /**
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143 * Retrieves the byte position at which the specified byte array pattern begins within the BLOB value that this
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144 * Blob object represents. The search for pattern begins at position start.
0
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145 *
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146 * @param pattern the byte array for which to search
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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147 * @param start the position at which to begin searching; the first position is 1
0
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148 * @return the position at which the pattern appears, else -1
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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149 * @throws SQLException if there is an error accessing the BLOB value
0
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150 */
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151 @Override
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152 public long position(byte[] pattern, long start) throws SQLException {
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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153 if (buffer == null)
0
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154 throw new SQLException("This Blob object has been freed", "M1M20");
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155 try {
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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156 for (int i = (int)(start - 1); i < buffer.length - pattern.length; i++) {
0
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157 int j;
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158 for (j = 0; j < pattern.length; j++) {
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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159 if (buffer[i + j] != pattern[j])
0
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160 break;
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161 }
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162 if (j == pattern.length)
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163 return i;
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164 }
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165 } catch (IndexOutOfBoundsException e) {
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166 throw new SQLException(e.getMessage(), "M0M10");
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167 }
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168 return -1;
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169 }
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170
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171 /**
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172 * Retrieves a stream that can be used to write to the BLOB value
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173 * that this Blob object represents. The stream begins at position
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174 * pos. The bytes written to the stream will overwrite the existing
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175 * bytes in the Blob object starting at the position pos. If the end
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176 * of the Blob value is reached while writing to the stream, then
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177 * the length of the Blob value will be increased to accomodate the
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178 * extra bytes.
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179 *
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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180 * @param pos the position in the BLOB value at which to start writing; the first position is 1
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181 * @return a java.io.OutputStream object to which data can be written
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182 * @throws SQLException if there is an error accessing the BLOB value or if pos is less than 1
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183 * @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method
0
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184 */
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185 @Override
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186 public OutputStream setBinaryStream(long pos) throws SQLException {
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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187 if (buffer == null)
0
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188 throw new SQLException("This Blob object has been freed", "M1M20");
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189 if (pos < 1)
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190 throw new SQLException("pos is less than 1", "M1M05");
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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191 throw new SQLFeatureNotSupportedException("Operation setBinaryStream(long pos) currently not supported",
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192 "0A000");
0
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193 }
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194
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195 /**
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196 * Writes the given array of bytes to the BLOB value that this Blob
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197 * object represents, starting at position pos, and returns the
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198 * number of bytes written.
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199 *
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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200 * @param pos the position in the BLOB object at which to start writing
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201 * @param bytes the array of bytes to be written to the BLOB value that this Blob object represents
0
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202 * @return the number of bytes written
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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203 * @throws SQLException if there is an error accessing the BLOB value
0
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204 */
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205 @Override
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206 public int setBytes(long pos, byte[] bytes) throws SQLException {
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207 return setBytes(pos, bytes, 1, bytes.length);
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208 }
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209
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210 /**
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211 * Writes all or part of the given byte array to the BLOB value that
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212 * this Blob object represents and returns the number of bytes
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213 * written. Writing starts at position pos in the BLOB value; len
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214 * bytes from the given byte array are written.
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215 *
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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216 * @param pos the position in the BLOB object at which to start writing
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217 * @param bytes the array of bytes to be written to this BLOB object
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218 * @param offset the offset into the array bytes at which to start reading the bytes to be set
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219 * @param len the number of bytes to be written to the BLOB value from the array of bytes bytes
0
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220 * @return the number of bytes written
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diff changeset
221 * @throws SQLException if there is an error accessing the BLOB value
0
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222 */
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223 @Override
66
7307caacc2d5 Intermediary commit. Cross-implementation interface (for mapi connection with the old protocol, mapi connection with the new protocol and the embedded connection) almost done. The mcl layer processing is more memory efficient now.
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224 public int setBytes(long pos, byte[] bytes, int offset, int len) throws SQLException {
68
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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diff changeset
225 if (buffer == null)
0
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226 throw new SQLException("This Blob object has been freed", "M1M20");
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227 try {
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228 /* transactions? what are you talking about? */
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229 System.arraycopy(bytes, offset - 1 + (int) pos, buffer, (int) pos, len - (int) pos);
0
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230 } catch (IndexOutOfBoundsException e) {
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231 throw new SQLException(e.getMessage(), "M0M10");
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232 }
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233 return len;
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234 }
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235
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236 /**
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237 * Truncates the BLOB value that this Blob object represents to be len bytes in length.
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238 *
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239 * @param len the length, in bytes, to which the BLOB value should be truncated
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240 * @throws SQLException if there is an error accessing the BLOB value
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241 */
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242 @Override
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243 public void truncate(long len) throws SQLException {
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244 if (buffer == null)
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245 throw new SQLException("This Blob object has been freed", "M1M20");
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246 if (buffer.length > len) {
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247 byte[] newbuf = new byte[(int)len];
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248 System.arraycopy(buffer, 0, newbuf, 0, (int) len);
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249 buffer = newbuf;
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250 }
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251 }
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252
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253 /**
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254 * Overriding the equals method for the byte array.
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255 */
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256 @Override
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257 public boolean equals(Object obj) {
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258 return obj instanceof MonetBlob && Arrays.equals(this.buffer, ((MonetBlob) obj).buffer);
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259 }
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260
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261 /**
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262 * Overriding the hashCode method for the byte array.
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263 */
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264 @Override
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265 public int hashCode() { return Arrays.hashCode(this.buffer); }
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266
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267 /**
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268 * Overriding the toString method for the byte array.
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269 */
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270 @Override
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271 public String toString() { return Arrays.toString(this.buffer); }
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272
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273 @Override
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274 public int compareTo(MonetBlob o) {
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275 byte[] first = this.buffer, second = o.buffer;
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276 int len = Math.min(first.length, second.length), res = 0;
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277 for(int i = 0; i < len ; i++) {
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278 res = res + first[i] - second[i];
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279 }
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280 return res;
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281 }
0
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282 }