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| <h2 title="Class TupleTag" class="title">Class TupleTag<V></h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <li>org.apache.beam.sdk.values.TupleTag<V></li> |
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| <dd><code>V</code> - the type of the elements or values of the tagged thing, e.g., a <code>PCollection<V></code>.</dd> |
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| <dl> |
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| <dd>java.io.Serializable</dd> |
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| <pre>public class <span class="typeNameLabel">TupleTag<V></span> |
| extends java.lang.Object |
| implements java.io.Serializable</pre> |
| <div class="block">A <a href="../../../../../org/apache/beam/sdk/values/TupleTag.html" title="class in org.apache.beam.sdk.values"><code>TupleTag</code></a> is a typed tag to use as the key of a heterogeneously typed tuple, like <a href="../../../../../org/apache/beam/sdk/values/PCollectionTuple.html" title="class in org.apache.beam.sdk.values"><code>PCollectionTuple</code></a>. Its generic type parameter allows tracking the static type of things stored in |
| tuples. |
| |
| <p>To aid in assigning default <a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders"><code>Coders</code></a> for results of a |
| <a href="../../../../../org/apache/beam/sdk/transforms/ParDo.html" title="class in org.apache.beam.sdk.transforms"><code>ParDo</code></a>, an output <a href="../../../../../org/apache/beam/sdk/values/TupleTag.html" title="class in org.apache.beam.sdk.values"><code>TupleTag</code></a> should be instantiated with an extra <code>{}</code> so it |
| is an instance of an anonymous subclass without generic type parameters. Input <a href="../../../../../org/apache/beam/sdk/values/TupleTag.html" title="class in org.apache.beam.sdk.values"><code>TupleTags</code></a> require no such extra instantiation (although it doesn't hurt). For example: |
| |
| <pre><code> |
| TupleTag<SomeType> inputTag = new TupleTag<>(); |
| TupleTag<SomeOtherType> outputTag = new TupleTag<SomeOtherType>(){}; |
| </code></pre></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../serialized-form.html#org.apache.beam.sdk.values.TupleTag">Serialized Form</a></dd> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/values/TupleTag.html#TupleTag--">TupleTag</a></span>()</code> |
| <div class="block">Constructs a new <code>TupleTag</code>, with a fresh unique id.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/values/TupleTag.html#TupleTag-java.lang.String-">TupleTag</a></span>(java.lang.String id)</code> |
| <div class="block">Constructs a new <code>TupleTag</code> with the given id.</div> |
| </td> |
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| <th class="colLast" scope="col">Method and Description</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/values/TupleTag.html#equals-java.lang.Object-">equals</a></span>(java.lang.Object that)</code> </td> |
| </tr> |
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| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/values/TupleTag.html#getId--">getId</a></span>()</code> |
| <div class="block">Returns the id of this <code>TupleTag</code>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/values/TupleTag.html#getOutName-int-">getOutName</a></span>(int outIndex)</code> |
| <div class="block">If this <code>TupleTag</code> is tagging output <code>outputIndex</code> of a <code>PTransform</code>, returns |
| the name that should be used by default for the output.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/values/TypeDescriptor.html" title="class in org.apache.beam.sdk.values">TypeDescriptor</a><<a href="../../../../../org/apache/beam/sdk/values/TupleTag.html" title="type parameter in TupleTag">V</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/values/TupleTag.html#getTypeDescriptor--">getTypeDescriptor</a></span>()</code> |
| <div class="block">Returns a <code>TypeDescriptor</code> capturing what is known statically about the type of this |
| <code>TupleTag</code> instance's most-derived class.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/values/TupleTag.html#hashCode--">hashCode</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/values/TupleTag.html#toString--">toString</a></span>()</code> </td> |
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| <code>clone, finalize, getClass, notify, notifyAll, wait, wait, wait</code></li> |
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| <h4>TupleTag</h4> |
| <pre>public TupleTag()</pre> |
| <div class="block">Constructs a new <code>TupleTag</code>, with a fresh unique id. |
| |
| <p>This is the normal way <code>TupleTag</code>s are constructed.</div> |
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| <h4>TupleTag</h4> |
| <pre>public TupleTag(java.lang.String id)</pre> |
| <div class="block">Constructs a new <code>TupleTag</code> with the given id. |
| |
| <p>It is up to the user to ensure that two <code>TupleTag</code>s with the same id actually mean the |
| same tag and carry the same generic type parameter. Violating this invariant can lead to |
| hard-to-diagnose runtime type errors. Consequently, this operation should be used very |
| sparingly, such as when the producer and consumer of <code>TupleTag</code>s are written in separate |
| modules and can only coordinate via ids rather than shared <code>TupleTag</code> instances. Most of |
| the time, <a href="../../../../../org/apache/beam/sdk/values/TupleTag.html#TupleTag--"><code>TupleTag()</code></a> should be preferred.</div> |
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| <pre>public java.lang.String getId()</pre> |
| <div class="block">Returns the id of this <code>TupleTag</code>. |
| |
| <p>Two <code>TupleTag</code>s with the same id are considered equal. |
| |
| <p><code>TupleTag</code>s are not ordered, i.e., the class does not implement Comparable interface. |
| TupleTags implement equals and hashCode, making them suitable for use as keys in HashMap and |
| HashSet.</div> |
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| <pre>public java.lang.String getOutName(int outIndex)</pre> |
| <div class="block">If this <code>TupleTag</code> is tagging output <code>outputIndex</code> of a <code>PTransform</code>, returns |
| the name that should be used by default for the output.</div> |
| </li> |
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| <pre>public <a href="../../../../../org/apache/beam/sdk/values/TypeDescriptor.html" title="class in org.apache.beam.sdk.values">TypeDescriptor</a><<a href="../../../../../org/apache/beam/sdk/values/TupleTag.html" title="type parameter in TupleTag">V</a>> getTypeDescriptor()</pre> |
| <div class="block">Returns a <code>TypeDescriptor</code> capturing what is known statically about the type of this |
| <code>TupleTag</code> instance's most-derived class. |
| |
| <p>This is useful for a <code>TupleTag</code> constructed as an instance of an anonymous subclass |
| with a trailing <code>{}</code>, e.g., <code>new TupleTag<SomeType>(){}</code>.</div> |
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