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.InputStream; |
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22 | import java.io.IOException; |
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23 | import java.util.ArrayList; |
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24 | |
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25 | import org.xml.sax.*; |
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26 | import org.xml.sax.helpers.DefaultHandler; |
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27 | import javax.xml.parsers.SAXParserFactory; |
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28 | import javax.xml.parsers.SAXParser; |
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29 | |
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30 | /** |
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31 | * XML Deserializer. |
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32 | */ |
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33 | public class XmlRecordInput implements RecordInput { |
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34 | |
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35 | static private class Value { |
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36 | private String type; |
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37 | private StringBuffer sb; |
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38 | |
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39 | public Value(String t) { |
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40 | type = t; |
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41 | sb = new StringBuffer(); |
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42 | } |
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43 | public void addChars(char[] buf, int offset, int len) { |
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44 | sb.append(buf, offset, len); |
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45 | } |
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46 | public String getValue() { return sb.toString(); } |
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47 | public String getType() { return type; } |
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48 | } |
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49 | |
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50 | private static class XMLParser extends DefaultHandler { |
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51 | private boolean charsValid = false; |
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52 | |
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53 | private ArrayList<Value> valList; |
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54 | |
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55 | private XMLParser(ArrayList<Value> vlist) { |
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56 | valList = vlist; |
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57 | } |
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58 | |
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59 | public void startDocument() throws SAXException {} |
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60 | |
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61 | public void endDocument() throws SAXException {} |
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62 | |
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63 | public void startElement(String ns, |
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64 | String sname, |
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65 | String qname, |
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66 | Attributes attrs) throws SAXException { |
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67 | charsValid = false; |
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68 | if ("boolean".equals(qname) || |
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69 | "i4".equals(qname) || |
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70 | "int".equals(qname) || |
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71 | "string".equals(qname) || |
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72 | "double".equals(qname) || |
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73 | "ex:i1".equals(qname) || |
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74 | "ex:i8".equals(qname) || |
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75 | "ex:float".equals(qname)) { |
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76 | charsValid = true; |
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77 | valList.add(new Value(qname)); |
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78 | } else if ("struct".equals(qname) || |
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79 | "array".equals(qname)) { |
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80 | valList.add(new Value(qname)); |
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81 | } |
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82 | } |
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83 | |
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84 | public void endElement(String ns, |
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85 | String sname, |
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86 | String qname) throws SAXException { |
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87 | charsValid = false; |
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88 | if ("struct".equals(qname) || |
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89 | "array".equals(qname)) { |
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90 | valList.add(new Value("/"+qname)); |
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91 | } |
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92 | } |
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93 | |
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94 | public void characters(char buf[], int offset, int len) |
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95 | throws SAXException { |
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96 | if (charsValid) { |
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97 | Value v = valList.get(valList.size()-1); |
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98 | v.addChars(buf, offset, len); |
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99 | } |
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100 | } |
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101 | |
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102 | } |
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103 | |
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104 | private class XmlIndex implements Index { |
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105 | public boolean done() { |
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106 | Value v = valList.get(vIdx); |
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107 | if ("/array".equals(v.getType())) { |
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108 | valList.set(vIdx, null); |
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109 | vIdx++; |
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110 | return true; |
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111 | } else { |
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112 | return false; |
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113 | } |
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114 | } |
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115 | public void incr() {} |
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116 | } |
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117 | |
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118 | private ArrayList<Value> valList; |
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119 | private int vLen; |
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120 | private int vIdx; |
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121 | |
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122 | private Value next() throws IOException { |
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123 | if (vIdx < vLen) { |
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124 | Value v = valList.get(vIdx); |
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125 | valList.set(vIdx, null); |
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126 | vIdx++; |
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127 | return v; |
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128 | } else { |
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129 | throw new IOException("Error in deserialization."); |
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130 | } |
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131 | } |
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132 | |
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133 | /** Creates a new instance of XmlRecordInput */ |
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134 | public XmlRecordInput(InputStream in) { |
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135 | try{ |
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136 | valList = new ArrayList<Value>(); |
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137 | DefaultHandler handler = new XMLParser(valList); |
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138 | SAXParserFactory factory = SAXParserFactory.newInstance(); |
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139 | SAXParser parser = factory.newSAXParser(); |
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140 | parser.parse(in, handler); |
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141 | vLen = valList.size(); |
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142 | vIdx = 0; |
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143 | } catch (Exception ex) { |
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144 | throw new RuntimeException(ex); |
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145 | } |
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146 | } |
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147 | |
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148 | public byte readByte(String tag) throws IOException { |
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149 | Value v = next(); |
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150 | if (!"ex:i1".equals(v.getType())) { |
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151 | throw new IOException("Error deserializing "+tag+"."); |
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152 | } |
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153 | return Byte.parseByte(v.getValue()); |
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154 | } |
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155 | |
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156 | public boolean readBool(String tag) throws IOException { |
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157 | Value v = next(); |
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158 | if (!"boolean".equals(v.getType())) { |
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159 | throw new IOException("Error deserializing "+tag+"."); |
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160 | } |
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161 | return "1".equals(v.getValue()); |
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162 | } |
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163 | |
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164 | public int readInt(String tag) throws IOException { |
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165 | Value v = next(); |
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166 | if (!"i4".equals(v.getType()) && |
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167 | !"int".equals(v.getType())) { |
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168 | throw new IOException("Error deserializing "+tag+"."); |
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169 | } |
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170 | return Integer.parseInt(v.getValue()); |
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171 | } |
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172 | |
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173 | public long readLong(String tag) throws IOException { |
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174 | Value v = next(); |
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175 | if (!"ex:i8".equals(v.getType())) { |
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176 | throw new IOException("Error deserializing "+tag+"."); |
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177 | } |
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178 | return Long.parseLong(v.getValue()); |
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179 | } |
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180 | |
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181 | public float readFloat(String tag) throws IOException { |
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182 | Value v = next(); |
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183 | if (!"ex:float".equals(v.getType())) { |
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184 | throw new IOException("Error deserializing "+tag+"."); |
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185 | } |
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186 | return Float.parseFloat(v.getValue()); |
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187 | } |
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188 | |
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189 | public double readDouble(String tag) throws IOException { |
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190 | Value v = next(); |
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191 | if (!"double".equals(v.getType())) { |
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192 | throw new IOException("Error deserializing "+tag+"."); |
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193 | } |
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194 | return Double.parseDouble(v.getValue()); |
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195 | } |
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196 | |
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197 | public String readString(String tag) throws IOException { |
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198 | Value v = next(); |
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199 | if (!"string".equals(v.getType())) { |
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200 | throw new IOException("Error deserializing "+tag+"."); |
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201 | } |
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202 | return Utils.fromXMLString(v.getValue()); |
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203 | } |
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204 | |
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205 | public Buffer readBuffer(String tag) throws IOException { |
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206 | Value v = next(); |
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207 | if (!"string".equals(v.getType())) { |
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208 | throw new IOException("Error deserializing "+tag+"."); |
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209 | } |
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210 | return Utils.fromXMLBuffer(v.getValue()); |
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211 | } |
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212 | |
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213 | public void startRecord(String tag) throws IOException { |
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214 | Value v = next(); |
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215 | if (!"struct".equals(v.getType())) { |
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216 | throw new IOException("Error deserializing "+tag+"."); |
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217 | } |
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218 | } |
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219 | |
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220 | public void endRecord(String tag) throws IOException { |
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221 | Value v = next(); |
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222 | if (!"/struct".equals(v.getType())) { |
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223 | throw new IOException("Error deserializing "+tag+"."); |
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224 | } |
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225 | } |
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226 | |
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227 | public Index startVector(String tag) throws IOException { |
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228 | Value v = next(); |
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229 | if (!"array".equals(v.getType())) { |
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230 | throw new IOException("Error deserializing "+tag+"."); |
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231 | } |
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232 | return new XmlIndex(); |
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233 | } |
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234 | |
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235 | public void endVector(String tag) throws IOException {} |
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236 | |
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237 | public Index startMap(String tag) throws IOException { |
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238 | return startVector(tag); |
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239 | } |
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240 | |
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241 | public void endMap(String tag) throws IOException { endVector(tag); } |
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242 | |
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243 | } |
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