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1 /* |
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2 * Copyright (c) 2004, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package javax.xml.bind.annotation; |
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27 |
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28 import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter; |
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29 import java.lang.annotation.Retention; |
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30 import java.lang.annotation.Target; |
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31 |
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32 import static java.lang.annotation.ElementType.*; |
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33 import static java.lang.annotation.ElementType.PARAMETER; |
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34 import static java.lang.annotation.RetentionPolicy.*; |
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35 |
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36 /** |
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37 * Maps a JavaBean property to a XML element derived from property name. |
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38 * |
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39 * <p> <b>Usage</b> </p> |
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40 * <p> |
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41 * <tt>@XmlElement</tt> annotation can be used with the following program |
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42 * elements: |
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43 * <ul> |
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44 * <li> a JavaBean property </li> |
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45 * <li> non static, non transient field </li> |
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46 * <li> within {@link XmlElements} |
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47 * <p> |
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48 * |
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49 * </ul> |
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50 * |
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51 * The usage is subject to the following constraints: |
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52 * <ul> |
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53 * <li> This annotation can be used with following annotations: |
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54 * {@link XmlID}, |
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55 * {@link XmlIDREF}, |
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56 * {@link XmlList}, |
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57 * {@link XmlSchemaType}, |
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58 * {@link XmlValue}, |
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59 * {@link XmlAttachmentRef}, |
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60 * {@link XmlMimeType}, |
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61 * {@link XmlInlineBinaryData}, |
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62 * {@link XmlElementWrapper}, |
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63 * {@link XmlJavaTypeAdapter}</li> |
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64 * <li> if the type of JavaBean property is a collection type of |
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65 * array, an indexed property, or a parameterized list, and |
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66 * this annotation is used with {@link XmlElements} then, |
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67 * <tt>@XmlElement.type()</tt> must be DEFAULT.class since the |
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68 * collection item type is already known. </li> |
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69 * </ul> |
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70 * |
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71 * <p> |
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72 * A JavaBean property, when annotated with @XmlElement annotation |
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73 * is mapped to a local element in the XML Schema complex type to |
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74 * which the containing class is mapped. |
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75 * |
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76 * <p> |
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77 * <b>Example 1: </b> Map a public non static non final field to local |
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78 * element |
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79 * <pre> |
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80 * //Example: Code fragment |
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81 * public class USPrice { |
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82 * @XmlElement(name="itemprice") |
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83 * public java.math.BigDecimal price; |
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84 * } |
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85 * |
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86 * <!-- Example: Local XML Schema element --> |
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87 * <xs:complexType name="USPrice"/> |
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88 * <xs:sequence> |
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89 * <xs:element name="itemprice" type="xs:decimal" minOccurs="0"/> |
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90 * </sequence> |
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91 * </xs:complexType> |
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92 * </pre> |
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93 * <p> |
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94 * |
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95 * <b> Example 2: </b> Map a field to a nillable element. |
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96 * <pre> |
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97 * |
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98 * //Example: Code fragment |
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99 * public class USPrice { |
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100 * @XmlElement(nillable=true) |
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101 * public java.math.BigDecimal price; |
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102 * } |
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103 * |
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104 * <!-- Example: Local XML Schema element --> |
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105 * <xs:complexType name="USPrice"> |
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106 * <xs:sequence> |
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107 * <xs:element name="price" type="xs:decimal" nillable="true" minOccurs="0"/> |
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108 * </sequence> |
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109 * </xs:complexType> |
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110 * </pre> |
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111 * <p> |
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112 * <b> Example 3: </b> Map a field to a nillable, required element. |
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113 * <pre> |
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114 * |
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115 * //Example: Code fragment |
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116 * public class USPrice { |
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117 * @XmlElement(nillable=true, required=true) |
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118 * public java.math.BigDecimal price; |
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119 * } |
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120 * |
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121 * <!-- Example: Local XML Schema element --> |
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122 * <xs:complexType name="USPrice"> |
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123 * <xs:sequence> |
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124 * <xs:element name="price" type="xs:decimal" nillable="true" minOccurs="1"/> |
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125 * </sequence> |
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126 * </xs:complexType> |
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127 * </pre> |
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128 * <p> |
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129 * |
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130 * <p> <b>Example 4: </b>Map a JavaBean property to an XML element |
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131 * with anonymous type.</p> |
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132 * <p> |
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133 * See Example 6 in @{@link XmlType}. |
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134 * |
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135 * <p> |
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136 * @author Sekhar Vajjhala, Sun Microsystems, Inc. |
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137 * @since JAXB2.0 |
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138 */ |
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139 |
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140 @Retention(RUNTIME) @Target({FIELD, METHOD, PARAMETER}) |
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141 public @interface XmlElement { |
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142 /** |
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143 * Name of the XML Schema element. |
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144 * <p> If the value is "##default", then element name is derived from the |
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145 * JavaBean property name. |
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146 */ |
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147 String name() default "##default"; |
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148 |
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149 /** |
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150 * Customize the element declaration to be nillable. |
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151 * <p>If nillable() is true, then the JavaBean property is |
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152 * mapped to a XML Schema nillable element declaration. |
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153 */ |
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154 boolean nillable() default false; |
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155 |
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156 /** |
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157 * Customize the element declaration to be required. |
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158 * <p>If required() is true, then Javabean property is mapped to |
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159 * an XML schema element declaration with minOccurs="1". |
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160 * maxOccurs is "1" for a single valued property and "unbounded" |
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161 * for a multivalued property. |
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162 * <p>If required() is false, then the Javabean property is mapped |
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163 * to XML Schema element declaration with minOccurs="0". |
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164 * maxOccurs is "1" for a single valued property and "unbounded" |
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165 * for a multivalued property. |
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166 */ |
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167 |
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168 boolean required() default false; |
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169 |
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170 /** |
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171 * XML target namespace of the XML Schema element. |
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172 * <p> |
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173 * If the value is "##default", then the namespace is determined |
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174 * as follows: |
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175 * <ol> |
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176 * <li> |
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177 * If the enclosing package has {@link XmlSchema} annotation, |
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178 * and its {@link XmlSchema#elementFormDefault() elementFormDefault} |
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179 * is {@link XmlNsForm#QUALIFIED QUALIFIED}, then the namespace of |
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180 * the enclosing class. |
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181 * |
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182 * <li> |
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183 * Otherwise '' (which produces unqualified element in the default |
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184 * namespace. |
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185 * </ol> |
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186 */ |
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187 String namespace() default "##default"; |
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188 |
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189 /** |
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190 * Default value of this element. |
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191 * |
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192 * <p> |
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193 * The <pre>'\u0000'</pre> value specified as a default of this annotation element |
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194 * is used as a poor-man's substitute for null to allow implementations |
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195 * to recognize the 'no default value' state. |
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196 */ |
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197 String defaultValue() default "\u0000"; |
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198 |
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199 /** |
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200 * The Java class being referenced. |
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201 */ |
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202 Class type() default DEFAULT.class; |
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203 |
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204 /** |
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205 * Used in {@link XmlElement#type()} to |
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206 * signal that the type be inferred from the signature |
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207 * of the property. |
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208 */ |
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209 static final class DEFAULT {} |
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210 } |