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| <h2 title="类 RelEnumTypes" class="title">类 RelEnumTypes</h2> |
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| <pre>public abstract class <span class="typeNameLabel">RelEnumTypes</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></pre> |
| <div class="block">Registry of <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="java.lang中的类或接口"><code>Enum</code></a> classes that can be serialized to JSON. |
| |
| <p>Suppose you want to serialize the value |
| <code>SqlTrimFunction.Flag#LEADING</code> to JSON. |
| First, make sure that <code>SqlTrimFunction.Flag</code> is registered. |
| The type will be serialized as "SYMBOL". |
| The value will be serialized as the string "LEADING". |
| |
| <p>When we deserialize, we rely on the fact that the registered |
| <code>enum</code> classes have distinct values. Therefore, knowing that |
| <code>(type="SYMBOL", value="LEADING")</code> we can convert the string "LEADING" |
| to the enum <code>Flag.LEADING</code>.</div> |
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| <caption><span id="t0" class="activeTableTab"><span>所有方法</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">静态方法</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">具体方法</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">限定符和类型</th> |
| <th class="colLast" scope="col">方法和说明</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/externalize/RelEnumTypes.html#fromEnum-java.lang.Enum-">fromEnum</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="java.lang中的类或接口">Enum</a> enumValue)</code> |
| <div class="block">Converts an enum into its name.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/externalize/RelEnumTypes.html#fromEnum-java.lang.Object-">fromEnum</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a> value)</code> |
| <div class="block">Converts a literal into a value that can be serialized to JSON.</div> |
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| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="java.lang中的类或接口">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="java.lang中的类或接口">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="java.lang中的类或接口">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="java.lang中的类或接口">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="java.lang中的类或接口">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="java.lang中的类或接口">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="java.lang中的类或接口">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="java.lang中的类或接口">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="java.lang中的类或接口">wait</a></code></li> |
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| <h4>fromEnum</h4> |
| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a> fromEnum(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a> value)</pre> |
| <div class="block">Converts a literal into a value that can be serialized to JSON. |
| In particular, if is an enum, converts it to its name.</div> |
| </li> |
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| <h4>fromEnum</h4> |
| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> fromEnum(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="java.lang中的类或接口">Enum</a> enumValue)</pre> |
| <div class="block">Converts an enum into its name. |
| Throws if the enum's class is not registered.</div> |
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