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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rel.externalize</a></div> |
| <h2 title="Class RelEnumTypes" class="title">Class RelEnumTypes</h2> |
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| <li>java.lang.Object</li> |
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| <pre>public abstract class <span class="typeNameLabel">RelEnumTypes</span> |
| extends java.lang.Object</pre> |
| <div class="block">Registry of <code>Enum</code> classes that can be serialized to JSON. |
| |
| <p>Suppose you want to serialize the value |
| <a href="../../sql/fun/SqlTrimFunction.Flag.html#LEADING"><code>SqlTrimFunction.Flag.LEADING</code></a> to JSON. |
| First, make sure that <a href="../../sql/fun/SqlTrimFunction.Flag.html" title="enum in org.apache.calcite.sql.fun"><code>SqlTrimFunction.Flag</code></a> 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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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static com.google.common.collect.ImmutableMap<java.lang.String,​java.lang.Enum<?>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#ENUM_BY_NAME">ENUM_BY_NAME</a></span></code></th> |
| <td class="colLast"> </td> |
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| <td class="colFirst"><code>private </code></td> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">RelEnumTypes</a></span>()</code></th> |
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| <td class="colFirst"><code>static java.lang.String</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#fromEnum(java.lang.Enum)">fromEnum</a></span>​(java.lang.Enum enumValue)</code></th> |
| <td class="colLast"> |
| <div class="block">Converts an enum into its name.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static java.lang.Object</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#fromEnum(java.lang.Object)">fromEnum</a></span>​(java.lang.Object value)</code></th> |
| <td class="colLast"> |
| <div class="block">Converts a literal into a value that can be serialized to JSON.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>private static void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#register(com.google.common.collect.ImmutableMap.Builder,java.lang.Class)">register</a></span>​(com.google.common.collect.ImmutableMap.Builder<java.lang.String,​java.lang.Enum<?>> builder, |
| java.lang.Class<? extends java.lang.Enum> aClass)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>(package private) static <E extends java.lang.Enum<E>><br>E</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toEnum(java.lang.String)">toEnum</a></span>​(java.lang.String name)</code></th> |
| <td class="colLast"> |
| <div class="block">Converts a string to an enum value.</div> |
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| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
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| <pre>private static final com.google.common.collect.ImmutableMap<java.lang.String,​java.lang.Enum<?>> ENUM_BY_NAME</pre> |
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| <h4>RelEnumTypes</h4> |
| <pre>private RelEnumTypes()</pre> |
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| <h4>register</h4> |
| <pre class="methodSignature">private static void register​(com.google.common.collect.ImmutableMap.Builder<java.lang.String,​java.lang.Enum<?>> builder, |
| java.lang.Class<? extends java.lang.Enum> aClass)</pre> |
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| <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> |
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| Throws if the enum's class is not registered.</div> |
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| <pre class="methodSignature">static <E extends java.lang.Enum<E>> E toEnum​(java.lang.String name)</pre> |
| <div class="block">Converts a string to an enum value. |
| The converse of <a href="#fromEnum(java.lang.Enum)"><code>fromEnum(Enum)</code></a>.</div> |
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