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| <div class="subTitle">org.apache.beam.sdk.schemas.annotations</div> |
| <h2 title="Annotation Type SchemaCreate" class="title">Annotation Type SchemaCreate</h2> |
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| <pre>@Documented |
| @Retention(value=RUNTIME) |
| @Target(value={CONSTRUCTOR,METHOD}) |
| <a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a>(<a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html#value--">value</a>=<a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.Kind.html#SCHEMAS">SCHEMAS</a>) |
| public @interface <span class="memberNameLabel">SchemaCreate</span></pre> |
| <div class="block">Can be put on a constructor or a static method, in which case that constructor or method will be |
| used to created instance of the class by Beam's schema code. |
| |
| <p>For example, the following Java POJO. |
| |
| <pre><code> |
| @DefaultSchema(JavaBeanSchema.class) |
| class MyClass { |
| public final String user; |
| public final int age; |
| |
| @SchemaCreate |
| public MyClass(String user, int age) { |
| this.user = user; |
| this.age = age; |
| } |
| } |
| </code></pre> |
| |
| <p>This tells Beam that this constructor can be used to construct instances. Beam will match up |
| the names of the constructor arguments to schema fields in order to decide how to create the |
| class from a Row. |
| |
| <p>This can also be used to annotate a static factory method on the class. For example: |
| |
| <pre><code> |
| @DefaultSchema(JavaBeanSchema.class) |
| class MyClass { |
| public final String user; |
| public final int age; |
| |
| private MyClass(String user, int age) { this.user = user; this.age = age; } |
| |
| @SchemaCreate |
| public static MyClass create(String user, int age) { |
| return new MyClass(user, age); |
| } |
| } |
| </code></pre></div> |
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