[jira] [Created] (BEAM-225) Create Class for Common TypeDescriptors

["Jesse Anderson (JIRA)" <ji...@apache.org>]

Jesse Anderson created BEAM-225:
-----------------------------------

             Summary: Create Class for Common TypeDescriptors
                 Key: BEAM-225
                 URL: https://issues.apache.org/jira/browse/BEAM-225
             Project: Beam
          Issue Type: Bug
          Components: sdk-java-core
            Reporter: Jesse Anderson
            Assignee: Davor Bonaci


There should be a built-in class for common types like String, Float, etc.

Right now, all types have to create an inline TypeDescriptor:
```java
        PCollection<String> words = suits.apply(
                FlatMapElements.via(
                        (String line) -> Arrays.asList(line.split(" "))
                ).withOutputType(new TypeDescriptor<String>() {}));
```

The should be a built-in class with common types like String so you don't have to create a TypeDescriptor each time like:
```java 
              PCollection<String> words = suits.apply(
                FlatMapElements.via(
                        (String line) -> Arrays.asList(line.split(" "))
                ).withOutputType(TypeDescriptors.STRINGS));
```

An example of this is Apache Crunch's Writables class https://crunch.apache.org/apidocs/0.11.0/org/apache/crunch/types/writable/Writables.html.



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