Improved Long-Double Number Policy

[ctasada]

Purpose

Fixes a performance issue while using the ToNumberPolicy.LONG_OR_DOUBLE with Double values

Description

The Parsing of a Double value was always executing a Long.parseLong(value), which generated a NumberFormatException.

Identifying that a Number is a Double or a Long can be easily achieve (in a naive way) looking for the decimal separator.

This simple change avoids the extra NumberFormatException

A simple JUnit test, parsing a Long or a Double 10K times shows the next values:

• Double (old parsing): ~42 ms
• Double (new parsing): ~6 ms
• Long (old parsing): ~7 ms
• Long (new parsing): ~7 ms

As we can see, the parsing for Long values stays the same (±1ms), while the parsing for Double is dramatically improved.

Reducing the number of exceptions also has a positive side effect in memory consumption.

Checklist

• [x] New code follows the Google Java Style Guide\ This is automatically checked by mvn verify, but can also be checked on its own using mvn spotless:check.\ Style violations can be fixed using mvn spotless:apply; this can be done in a separate commit to verify that it did not cause undesired changes.
• [ ] If necessary, new public API validates arguments, for example rejects null
• [ ] New public API has Javadoc
  • [ ] Javadoc uses @since $next-version$
    ($next-version$ is a special placeholder which is automatically replaced during release)
• [ ] If necessary, new unit tests have been added
  • [ ] Assertions in unit tests use Truth, see existing tests
  • [ ] No JUnit 3 features are used (such as extending class TestCase)
  • [ ] If this pull request fixes a bug, a new test was added for a situation which failed previously and is now fixed
• [x] mvn clean verify javadoc:jar passes without errors

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