[JOHNZON-162] support 'implicit converters' for certain types

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 1.1.7
• Component/s: JSON-B, Mapper
• Assignee: Mark Struberg
• Reporter: Mark Struberg
• Created: 16/Mar/18 15:49
• Updated: 28/Mar/18 16:22
• Resolved: 28/Mar/18 16:22

Description

We've got a great pull request via github https://github.com/apache/johnzon/pull/15

While the patch is fine I want to still stretch out and implement a feature we similarly added to the ConfigJSR:

https://github.com/eclipse/ConfigJSR/blob/master/api/src/main/java/javax/config/spi/Converter.java#L59

If no explicit Converter and no built-in Converter could be found for a certain type,
the {@code Config} provides an <em>Implicit Converter</em>, if

• The target type {@code T} has a Constructor with a String parameter, or
• The target type {@code T} has a Constructor with a CharSequence parameter, or
• the target type {@code T} has a {@code static T valueOf(String)} method, or
• the target type {@code T} has a {@code static T valueOf(CharSequence)} method, or
• the target type {@code T} has a {@code static T parse(String)} method, or
• the target type {@code T} has a {@code static T parse(CharSequence)} method

Since all the java8 time types DO implement one of those signatures we don't need anything more.