1 | /*
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 | *
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4 | * Copyright (c) 2011-2017 Oracle and/or its affiliates. All rights reserved.
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5 | *
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6 | * The contents of this file are subject to the terms of either the GNU
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7 | * General Public License Version 2 only ("GPL") or the Common Development
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8 | * and Distribution License("CDDL") (collectively, the "License"). You
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9 | * may not use this file except in compliance with the License. You can
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10 | * obtain a copy of the License at
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11 | * https://oss.oracle.com/licenses/CDDL+GPL-1.1
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12 | * or LICENSE.txt. See the License for the specific
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13 | * language governing permissions and limitations under the License.
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14 | *
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15 | * When distributing the software, include this License Header Notice in each
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16 | * file and include the License file at LICENSE.txt.
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17 | *
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18 | * GPL Classpath Exception:
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19 | * Oracle designates this particular file as subject to the "Classpath"
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20 | * exception as provided by Oracle in the GPL Version 2 section of the License
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21 | * file that accompanied this code.
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22 | *
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23 | * Modifications:
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24 | * If applicable, add the following below the License Header, with the fields
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25 | * enclosed by brackets [] replaced by your own identifying information:
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26 | * "Portions Copyright [year] [name of copyright owner]"
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27 | *
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28 | * Contributor(s):
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29 | * If you wish your version of this file to be governed by only the CDDL or
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30 | * only the GPL Version 2, indicate your decision by adding "[Contributor]
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31 | * elects to include this software in this distribution under the [CDDL or GPL
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32 | * Version 2] license." If you don't indicate a single choice of license, a
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33 | * recipient has the option to distribute your version of this file under
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34 | * either the CDDL, the GPL Version 2 or to extend the choice of license to
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35 | * its licensees as provided above. However, if you add GPL Version 2 code
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36 | * and therefore, elected the GPL Version 2 license, then the option applies
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37 | * only if the new code is made subject to such option by the copyright
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38 | * holder.
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39 | */
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40 |
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41 | package javax.json.stream;
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42 |
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43 |
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44 | import java.io.Closeable;
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45 | import java.math.BigDecimal;
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46 | import java.util.stream.Stream;
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47 | import java.util.Map;
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48 |
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49 | import javax.json.JsonValue;
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50 | import javax.json.JsonObject;
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51 | import javax.json.JsonArray;
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52 |
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53 | /**
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54 | * Provides forward, read-only access to JSON data in a streaming way. This
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55 | * is the most efficient way for reading JSON data.
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56 | * This is the only way to parse and process JSON data that are too big to be loaded in memory.
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57 | * <p>The class
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58 | * {@link javax.json.Json} contains methods to create parsers from input
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59 | * sources ({@link java.io.InputStream} and {@link java.io.Reader}).
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60 | *
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61 | * <p>
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62 | * The following example demonstrates how to create a parser from a string
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63 | * that contains an empty JSON array:
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64 | * <pre>
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65 | * <code>
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66 | * JsonParser parser = Json.createParser(new StringReader("[]"));
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67 | * </code>
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68 | * </pre>
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69 | *
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70 | * <p>
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71 | * The class {@link JsonParserFactory} also contains methods to create
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72 | * {@code JsonParser} instances. {@link JsonParserFactory} is preferred
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73 | * when creating multiple parser instances. A sample usage is shown
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74 | * in the following example:
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75 | * <pre>
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76 | * <code>
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77 | * JsonParserFactory factory = Json.createParserFactory();
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78 | * JsonParser parser1 = factory.createParser(...);
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79 | * JsonParser parser2 = factory.createParser(...);
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80 | * </code>
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81 | * </pre>
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82 | *
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83 | * <p>
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84 | * {@code JsonParser} parses JSON using the pull parsing programming model.
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85 | * In this model the client code controls the thread and calls the method
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86 | * {@code next()} to advance the parser to the next state after
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87 | * processing each element. The parser can generate the following events:
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88 | * {@code START_OBJECT}, {@code END_OBJECT}, {@code START_ARRAY},
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89 | * {@code END_ARRAY}, {@code KEY_NAME}, {@code VALUE_STRING},
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90 | * {@code VALUE_NUMBER}, {@code VALUE_TRUE}, {@code VALUE_FALSE},
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91 | * and {@code VALUE_NULL}.
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92 | *
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93 | * <p>
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94 | * <b>For example</b>, for an empty JSON object ({ }), the parser generates the event
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95 | * {@code START_OBJECT} with the first call to the method {@code next()} and the
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96 | * event {@code END_OBJECT} with the second call to the method {@code next()}.
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97 | * The following code demonstrates how to access these events:
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98 | *
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99 | * <pre>
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100 | * <code>
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101 | * Event event = parser.next(); // START_OBJECT
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102 | * event = parser.next(); // END_OBJECT
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103 | * </code>
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104 | * </pre>
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105 | *
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106 | * <p>
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107 | * <b>For example</b>, for the following JSON:
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108 | * <pre>
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109 | * {
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110 | * "firstName": "John", "lastName": "Smith", "age": 25,
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111 | * "phoneNumber": [
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112 | * { "type": "home", "number": "212 555-1234" },
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113 | * { "type": "fax", "number": "646 555-4567" }
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114 | * ]
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115 | * }
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116 | * </pre>
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117 | *
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118 | * <p>calls to the method {@code next()} result in parse events at the specified
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119 | * locations below (marked in bold):
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120 | *
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121 | * <pre>
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122 | * {<B>START_OBJECT</B>
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123 | * "firstName"<B>KEY_NAME</B>: "John"<B>VALUE_STRING</B>, "lastName"<B>KEY_NAME</B>: "Smith"<B>VALUE_STRING</B>, "age"<B>KEY_NAME</B>: 25<B>VALUE_NUMBER</B>,
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124 | * "phoneNumber"<B>KEY_NAME</B> : [<B>START_ARRAY</B>
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125 | * {<B>START_OBJECT</B> "type"<B>KEY_NAME</B>: "home"<B>VALUE_STRING</B>, "number"<B>KEY_NAME</B>: "212 555-1234"<B>VALUE_STRING</B> }<B>END_OBJECT</B>,
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126 | * {<B>START_OBJECT</B> "type"<B>KEY_NAME</B>: "fax"<B>VALUE_STRING</B>, "number"<B>KEY_NAME</B>: "646 555-4567"<B>VALUE_STRING</B> }<B>END_OBJECT</B>
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127 | * ]<B>END_ARRAY</B>
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128 | * }<B>END_OBJECT</B>
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129 | * </pre>
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130 | *
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131 | * The methods {@link #next()} and {@link #hasNext()} enable iteration over
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132 | * parser events to process JSON data. {@code JsonParser} provides get methods
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133 | * to obtain the value at the current state of the parser. For example, the
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134 | * following code shows how to obtain the value "John" from the JSON above:
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135 | *
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136 | * <pre>
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137 | * <code>
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138 | * Event event = parser.next(); // START_OBJECT
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139 | * event = parser.next(); // KEY_NAME
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140 | * event = parser.next(); // VALUE_STRING
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141 | * parser.getString(); // "John"
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142 | * </code>
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143 | * </pre>
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144 | *
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145 | * Starting in version 1.1, it is possible to build a partial JSON object
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146 | * model from the stream, at the current parser position.
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147 | * The methods {@link #getArray} and {@link #getObject} can be used to read in
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148 | * a {@code JsonArray} or {@code JsonObject}. For example, the following code
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149 | * shows how to obtain the phoneNumber in a JsonArray, from the JSON above:
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150 | *
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151 | * <pre><code>
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152 | * while (parser.hasNext() {
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153 | * Event event = parser.next();
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154 | * if (event == JsonParser.Event.KEY_NAME ) {
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155 | * String key = getString();
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156 | * event = parser.next();
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157 | * if (key.equals("phoneNumber") {
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158 | * JsonArray phones = parser.getArray();
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159 | * }
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160 | * }
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161 | * }
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162 | * </code></pre>
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163 | *
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164 | * The methods {@link #getArrayStream} and {@link #getObjectStream} can be used
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165 | * to get a stream of the elements of a {@code JsonArray} or {@code JsonObject}.
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166 | * For example, the following code shows another way to obtain John's phoneNumber
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167 | * in a {@code JsonArray} :
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168 | *
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169 | * <pre>{@code
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170 | * Event event = parser.next(); // START_OBJECT
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171 | * JsonArray phones = (JsonArray)
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172 | * parser.getObjectStream().filter(e->e.getKey().equals("phoneNumber"))
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173 | * .map(e->e.getValue())
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174 | * .findFirst()
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175 | * .get();
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176 | * }</pre>
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177 | *
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178 | * The methods {@link #skipArray} and {@link #skipObject} can be used to
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179 | * skip tokens and position the parser to {@code END_ARRAY} or
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180 | * {@code END_OBJECT}.
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181 | * <p>
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182 | * {@code JsonParser} can be used to parse sequence of JSON values that are not
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183 | * enclosed in a JSON array, e.g. { } { }. The following code demonstrates how
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184 | * to parse such sequence.
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185 | * <pre><code>
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186 | * JsonParser parser = Json.createParser(...);
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187 | * while (parser.hasNext) {
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188 | * parser.next(); // advance parser state
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189 | * JsonValue value = parser.getValue();
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190 | * }
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191 | * </code></pre>
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192 | *
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193 | * @see javax.json.Json
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194 | * @see JsonParserFactory
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195 | */
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196 | public interface JsonParser extends /*Auto*/Closeable {
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197 |
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198 | /**
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199 | * An event from {@code JsonParser}.
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200 | */
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201 | enum Event {
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202 | /**
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203 | * Start of a JSON array. The position of the parser is after '['.
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204 | */
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205 | START_ARRAY,
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206 | /**
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207 | * Start of a JSON object. The position of the parser is after '{'.
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208 | */
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209 | START_OBJECT,
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210 | /**
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211 | * Name in a name/value pair of a JSON object. The position of the parser
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212 | * is after the key name. The method {@link #getString} returns the key
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213 | * name.
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214 | */
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215 | KEY_NAME,
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216 | /**
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217 | * String value in a JSON array or object. The position of the parser is
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218 | * after the string value. The method {@link #getString}
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219 | * returns the string value.
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220 | */
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221 | VALUE_STRING,
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222 | /**
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223 | * Number value in a JSON array or object. The position of the parser is
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224 | * after the number value. {@code JsonParser} provides the following
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225 | * methods to access the number value: {@link #getInt},
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226 | * {@link #getLong}, and {@link #getBigDecimal}.
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227 | */
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228 | VALUE_NUMBER,
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229 | /**
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230 | * {@code true} value in a JSON array or object. The position of the
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231 | * parser is after the {@code true} value.
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232 | */
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233 | VALUE_TRUE,
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234 | /**
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235 | * {@code false} value in a JSON array or object. The position of the
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236 | * parser is after the {@code false} value.
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237 | */
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238 | VALUE_FALSE,
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239 | /**
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240 | * {@code null} value in a JSON array or object. The position of the
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241 | * parser is after the {@code null} value.
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242 | */
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243 | VALUE_NULL,
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244 | /**
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245 | * End of a JSON object. The position of the parser is after '}'.
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246 | */
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247 | END_OBJECT,
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248 | /**
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249 | * End of a JSON array. The position of the parser is after ']'.
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250 | */
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251 | END_ARRAY
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252 | }
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253 |
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254 | /**
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255 | * Returns {@code true} if there are more parsing states. This method returns
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256 | * {@code false} if the parser reaches the end of the JSON text.
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257 | *
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258 | * @return {@code true} if there are more parsing states.
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259 | * @throws javax.json.JsonException if an i/o error occurs (IOException
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260 | * would be cause of JsonException)
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261 | * @throws JsonParsingException if the parser encounters invalid JSON
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262 | * when advancing to next state.
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263 | */
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264 | boolean hasNext();
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265 |
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266 | /**
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267 | * Returns the event for the next parsing state.
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268 | *
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269 | * @throws javax.json.JsonException if an i/o error occurs (IOException
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270 | * would be cause of JsonException)
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271 | * @throws JsonParsingException if the parser encounters invalid JSON
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272 | * when advancing to next state.
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273 | * @throws java.util.NoSuchElementException if there are no more parsing
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274 | * states.
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275 | * @return the event for the next parsing state
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276 | */
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277 | Event next();
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278 |
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279 | /**
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280 | * Returns a {@code String} for the name in a name/value pair,
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281 | * for a string value or a number value. This method should only be called
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282 | * when the parser state is {@link Event#KEY_NAME}, {@link Event#VALUE_STRING},
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283 | * or {@link Event#VALUE_NUMBER}.
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284 | *
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285 | * @return a name when the parser state is {@link Event#KEY_NAME}
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286 | * a string value when the parser state is {@link Event#VALUE_STRING}
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287 | * a number value when the parser state is {@link Event#VALUE_NUMBER}
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288 | * @throws IllegalStateException when the parser state is not
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289 | * {@code KEY_NAME}, {@code VALUE_STRING}, or {@code VALUE_NUMBER}
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290 | */
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291 | String getString();
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292 |
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293 | /**
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294 | * Returns true if the JSON number at the current parser state is a
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295 | * integral number. A {@link BigDecimal} may be used to store the value
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296 | * internally and this method semantics are defined using its
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297 | * {@code scale()}. If the scale is zero, then it is considered integral
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298 | * type. This integral type information can be used to invoke an
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299 | * appropriate accessor method to obtain a numeric value as in the
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300 | * following example:
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301 | *
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302 | * <pre>
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303 | * <code>
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304 | * JsonParser parser = ...
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305 | * if (parser.isIntegralNumber()) {
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306 | * parser.getInt(); // or other methods to get integral value
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307 | * } else {
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308 | * parser.getBigDecimal();
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309 | * }
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310 | * </code>
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311 | * </pre>
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312 | *
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313 | * @return true if this number is a integral number, otherwise false
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314 | * @throws IllegalStateException when the parser state is not
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315 | * {@code VALUE_NUMBER}
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316 | */
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317 | boolean isIntegralNumber();
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318 |
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319 | /**
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320 | * Returns a JSON number as an integer. The returned value is equal
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321 | * to {@code new BigDecimal(getString()).intValue()}. Note that
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322 | * this conversion can lose information about the overall magnitude
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323 | * and precision of the number value as well as return a result with
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324 | * the opposite sign. This method should only be called when the parser
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325 | * state is {@link Event#VALUE_NUMBER}.
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326 | *
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327 | * @return an integer for a JSON number
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328 | * @throws IllegalStateException when the parser state is not
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329 | * {@code VALUE_NUMBER}
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330 | * @see java.math.BigDecimal#intValue()
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331 | */
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332 | int getInt();
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333 |
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334 | /**
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335 | * Returns a JSON number as a long. The returned value is equal
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336 | * to {@code new BigDecimal(getString()).longValue()}. Note that this
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337 | * conversion can lose information about the overall magnitude and
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338 | * precision of the number value as well as return a result with
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339 | * the opposite sign. This method is only called when the parser state is
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340 | * {@link Event#VALUE_NUMBER}.
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341 | *
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342 | * @return a long for a JSON number
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343 | * @throws IllegalStateException when the parser state is not
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344 | * {@code VALUE_NUMBER}
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345 | * @see java.math.BigDecimal#longValue()
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346 | */
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347 | long getLong();
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348 |
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349 | /**
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350 | * Returns a JSON number as a {@code BigDecimal}. The {@code BigDecimal}
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351 | * is created using {@code new BigDecimal(getString())}. This
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352 | * method should only called when the parser state is
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353 | * {@link Event#VALUE_NUMBER}.
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354 | *
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355 | * @return a {@code BigDecimal} for a JSON number
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356 | * @throws IllegalStateException when the parser state is not
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357 | * {@code VALUE_NUMBER}
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358 | */
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359 | BigDecimal getBigDecimal();
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360 |
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361 | /**
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362 | * Return the location that corresponds to the parser's current state in
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363 | * the JSON input source. The location information is only valid in the
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364 | * current parser state (or until the parser is advanced to a next state).
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365 | *
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366 | * @return a non-null location corresponding to the current parser state
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367 | * in JSON input source
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368 | */
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369 | JsonLocation getLocation();
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370 |
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371 | /**
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372 | * Returns a {@code JsonObject} and advances the parser to the
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373 | * corresponding {@code END_OBJECT}.
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374 | *
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375 | * @return the {@code JsonObject} at the current parser position
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376 | *
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377 | * @throws IllegalStateException when the parser state is not
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378 | * {@code START_OBJECT}
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379 | *
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380 | * @since 1.1
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381 | */
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382 | default public JsonObject getObject() {
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383 | throw new UnsupportedOperationException();
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384 | }
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385 |
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386 | /**
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387 | * Returns a {@code JsonValue} at the current parser position.
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388 | * If the parser state is {@code START_ARRAY}, the behavior is
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389 | * the same as {@link #getArray}. If the parser state is
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390 | * {@code START_OBJECT}, the behavior is the same as
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391 | * {@link #getObject}. For all other cases, if applicable, the JSON value is
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392 | * read and returned.
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393 | *
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394 | * @return the {@code JsonValue} at the current parser position.
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395 | * @throws IllegalStateException when the parser state is
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396 | * {@code END_OBJECT} or {@code END_ARRAY}
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397 | *
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398 | * @since 1.1
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399 | */
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400 | default public JsonValue getValue() {
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401 | throw new UnsupportedOperationException();
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402 | }
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403 |
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404 | /**
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405 | * Returns a {@code JsonArray} and advance the parser to the
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406 | * the corresponding {@code END_ARRAY}.
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407 | *
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408 | * @return the {@code JsonArray} at the current parser position
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409 | *
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410 | * @throws IllegalStateException when the parser state is not
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411 | * {@code START_ARRAY}
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412 | *
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413 | * @since 1.1
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414 | */
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415 | default public JsonArray getArray() {
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416 | throw new UnsupportedOperationException();
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417 | }
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418 |
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419 | /**
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420 | * Returns a stream of the {@code JsonArray} elements.
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421 | * The parser state must be {@code START_ARRAY}.
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422 | * The elements are read lazily, on an as-needed basis, as
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423 | * required by the stream operations.
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424 | * If the stream operations do not consume
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425 | * all of the array elements, {@link skipArray} can be used to
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426 | * skip the unprocessed array elements.
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427 | *
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428 | * @return a stream of elements of the {@code JsonArray}
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429 | *
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430 | * @throws IllegalStateException when the parser state is not
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431 | * {@code START_ARRAY}
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432 | *
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433 | * @since 1.1
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434 | */
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435 | default public Stream<JsonValue> getArrayStream() {
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436 | throw new UnsupportedOperationException();
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437 | }
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438 |
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439 | /**
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440 | * Returns a stream of the {@code JsonObject}'s
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441 | * name/value pairs. The parser state must be {@code START_OBJECT}.
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442 | * The name/value pairs are read lazily, on an as-needed basis, as
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443 | * required by the stream operations.
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444 | * If the stream operations do not consume
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445 | * all of the object's name/value pairs, {@link skipObject} can be
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446 | * used to skip the unprocessed elements.
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447 | *
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448 | * @return a stream of name/value pairs of the {@code JsonObject}
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449 | *
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450 | * @throws IllegalStateException when the parser state is not
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451 | * {@code START_OBJECT}
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452 | *
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453 | * @since 1.1
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454 | */
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455 | default public Stream<Map.Entry<String,JsonValue>> getObjectStream() {
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456 | throw new UnsupportedOperationException();
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457 | }
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458 |
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459 | /**
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460 | * Returns a stream of {@code JsonValue} from a sequence of
|
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461 | * JSON values. The values are read lazily, on an as-needed basis,
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462 | * as needed by the stream operations.
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463 | *
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464 | * @return a Stream of {@code JsonValue}
|
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465 | *
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466 | * @throws IllegalStateException if the parser is in an array or object.
|
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467 | *
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468 | * @since 1.1
|
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469 | */
|
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470 | default public Stream<JsonValue> getValueStream() {
|
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471 | throw new UnsupportedOperationException();
|
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472 | }
|
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473 |
|
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474 | /**
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475 | * Advance the parser to {@code END_ARRAY}.
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476 | * If the parser is in array context, i.e. it has previously
|
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477 | * encountered a {@code START_ARRAY} without encountering the
|
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478 | * corresponding {@code END_ARRAY}, the parser is advanced to
|
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479 | * the corresponding {@code END_ARRAY}.
|
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480 | * If the parser is not in any array context, nothing happens.
|
---|
481 | *
|
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482 | * @since 1.1
|
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483 | */
|
---|
484 | default public void skipArray() {
|
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485 | throw new UnsupportedOperationException();
|
---|
486 | }
|
---|
487 |
|
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488 | /**
|
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489 | * Advance the parser to {@code END_OBJECT}.
|
---|
490 | * If the parser is in object context, i.e. it has previously
|
---|
491 | * encountered a {@code START_OBJECT} without encountering the
|
---|
492 | * corresponding {@code END_OBJECT}, the parser is advanced to
|
---|
493 | * the corresponding {@code END_OBJECT}.
|
---|
494 | * If the parser is not in any object context, nothing happens.
|
---|
495 | *
|
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496 | * @since 1.1
|
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497 | */
|
---|
498 | default public void skipObject() {
|
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499 | throw new UnsupportedOperationException();
|
---|
500 | }
|
---|
501 |
|
---|
502 | /**
|
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503 | * Closes this parser and frees any resources associated with the
|
---|
504 | * parser. This method closes the underlying input source.
|
---|
505 | *
|
---|
506 | * @throws javax.json.JsonException if an i/o error occurs (IOException
|
---|
507 | * would be cause of JsonException)
|
---|
508 | */
|
---|
509 | @Override
|
---|
510 | void close();
|
---|
511 | }
|
---|