1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | |
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19 | package org.apache.hadoop.record; |
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20 | |
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21 | import java.io.InputStreamReader; |
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22 | import java.io.InputStream; |
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23 | import java.io.IOException; |
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24 | import java.io.PushbackReader; |
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25 | import java.io.UnsupportedEncodingException; |
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26 | |
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27 | /** |
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28 | */ |
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29 | public class CsvRecordInput implements RecordInput { |
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30 | |
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31 | private PushbackReader stream; |
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32 | |
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33 | private class CsvIndex implements Index { |
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34 | public boolean done() { |
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35 | char c = '\0'; |
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36 | try { |
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37 | c = (char) stream.read(); |
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38 | stream.unread(c); |
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39 | } catch (IOException ex) { |
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40 | } |
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41 | return (c == '}') ? true : false; |
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42 | } |
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43 | public void incr() {} |
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44 | } |
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45 | |
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46 | private void throwExceptionOnError(String tag) throws IOException { |
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47 | throw new IOException("Error deserializing "+tag); |
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48 | } |
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49 | |
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50 | private String readField(String tag) throws IOException { |
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51 | try { |
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52 | StringBuffer buf = new StringBuffer(); |
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53 | while (true) { |
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54 | char c = (char) stream.read(); |
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55 | switch (c) { |
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56 | case ',': |
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57 | return buf.toString(); |
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58 | case '}': |
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59 | case '\n': |
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60 | case '\r': |
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61 | stream.unread(c); |
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62 | return buf.toString(); |
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63 | default: |
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64 | buf.append(c); |
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65 | } |
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66 | } |
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67 | } catch (IOException ex) { |
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68 | throw new IOException("Error reading "+tag); |
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69 | } |
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70 | } |
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71 | |
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72 | /** Creates a new instance of CsvRecordInput */ |
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73 | public CsvRecordInput(InputStream in) { |
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74 | try { |
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75 | stream = new PushbackReader(new InputStreamReader(in, "UTF-8")); |
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76 | } catch (UnsupportedEncodingException ex) { |
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77 | throw new RuntimeException(ex); |
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78 | } |
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79 | } |
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80 | |
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81 | public byte readByte(String tag) throws IOException { |
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82 | return (byte) readLong(tag); |
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83 | } |
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84 | |
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85 | public boolean readBool(String tag) throws IOException { |
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86 | String sval = readField(tag); |
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87 | return "T".equals(sval) ? true : false; |
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88 | } |
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89 | |
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90 | public int readInt(String tag) throws IOException { |
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91 | return (int) readLong(tag); |
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92 | } |
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93 | |
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94 | public long readLong(String tag) throws IOException { |
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95 | String sval = readField(tag); |
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96 | try { |
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97 | long lval = Long.parseLong(sval); |
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98 | return lval; |
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99 | } catch (NumberFormatException ex) { |
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100 | throw new IOException("Error deserializing "+tag); |
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101 | } |
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102 | } |
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103 | |
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104 | public float readFloat(String tag) throws IOException { |
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105 | return (float) readDouble(tag); |
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106 | } |
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107 | |
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108 | public double readDouble(String tag) throws IOException { |
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109 | String sval = readField(tag); |
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110 | try { |
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111 | double dval = Double.parseDouble(sval); |
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112 | return dval; |
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113 | } catch (NumberFormatException ex) { |
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114 | throw new IOException("Error deserializing "+tag); |
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115 | } |
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116 | } |
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117 | |
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118 | public String readString(String tag) throws IOException { |
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119 | String sval = readField(tag); |
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120 | return Utils.fromCSVString(sval); |
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121 | } |
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122 | |
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123 | public Buffer readBuffer(String tag) throws IOException { |
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124 | String sval = readField(tag); |
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125 | return Utils.fromCSVBuffer(sval); |
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126 | } |
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127 | |
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128 | public void startRecord(String tag) throws IOException { |
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129 | if (tag != null && !"".equals(tag)) { |
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130 | char c1 = (char) stream.read(); |
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131 | char c2 = (char) stream.read(); |
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132 | if (c1 != 's' || c2 != '{') { |
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133 | throw new IOException("Error deserializing "+tag); |
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134 | } |
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135 | } |
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136 | } |
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137 | |
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138 | public void endRecord(String tag) throws IOException { |
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139 | char c = (char) stream.read(); |
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140 | if (tag == null || "".equals(tag)) { |
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141 | if (c != '\n' && c != '\r') { |
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142 | throw new IOException("Error deserializing record."); |
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143 | } else { |
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144 | return; |
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145 | } |
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146 | } |
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147 | |
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148 | if (c != '}') { |
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149 | throw new IOException("Error deserializing "+tag); |
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150 | } |
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151 | c = (char) stream.read(); |
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152 | if (c != ',') { |
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153 | stream.unread(c); |
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154 | } |
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155 | |
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156 | return; |
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157 | } |
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158 | |
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159 | public Index startVector(String tag) throws IOException { |
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160 | char c1 = (char) stream.read(); |
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161 | char c2 = (char) stream.read(); |
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162 | if (c1 != 'v' || c2 != '{') { |
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163 | throw new IOException("Error deserializing "+tag); |
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164 | } |
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165 | return new CsvIndex(); |
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166 | } |
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167 | |
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168 | public void endVector(String tag) throws IOException { |
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169 | char c = (char) stream.read(); |
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170 | if (c != '}') { |
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171 | throw new IOException("Error deserializing "+tag); |
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172 | } |
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173 | c = (char) stream.read(); |
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174 | if (c != ',') { |
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175 | stream.unread(c); |
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176 | } |
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177 | return; |
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178 | } |
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179 | |
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180 | public Index startMap(String tag) throws IOException { |
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181 | char c1 = (char) stream.read(); |
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182 | char c2 = (char) stream.read(); |
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183 | if (c1 != 'm' || c2 != '{') { |
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184 | throw new IOException("Error deserializing "+tag); |
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185 | } |
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186 | return new CsvIndex(); |
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187 | } |
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188 | |
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189 | public void endMap(String tag) throws IOException { |
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190 | char c = (char) stream.read(); |
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191 | if (c != '}') { |
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192 | throw new IOException("Error deserializing "+tag); |
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193 | } |
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194 | c = (char) stream.read(); |
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195 | if (c != ',') { |
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196 | stream.unread(c); |
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197 | } |
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198 | return; |
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199 | } |
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200 | } |
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