[jira] [Created] (LOG4J2-1507) Allow Builders to be completely generic

["Gary Gregory (JIRA)" <ji...@apache.org>]

Gary Gregory created LOG4J2-1507:
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             Summary: Allow Builders to be completely generic
                 Key: LOG4J2-1507
                 URL: https://issues.apache.org/jira/browse/LOG4J2-1507
             Project: Log4j 2
          Issue Type: New Feature
          Components: Configurators
            Reporter: Gary Gregory
            Assignee: Gary Gregory
             Fix For: 2.7


Allow Builders to be completely generic. This is not just supporting {{Builder<T>}}, which works in 2.6.2, but to allow declarations like {{Builder<B extends Builder<B>>}} combined with setters that return {{B}}.

{code:java}
    public static class Builder<B extends Builder<B>> implements org.apache.logging.log4j.core.util.Builder<ValidatingPluginWithGenericBuilder> {

        @PluginBuilderAttribute
        @Required(message = "The name given by the builder is null")
        private String name;

        public B withName(final String name) {
            this.name = name;
            return asBuilder();
        }

        @SuppressWarnings("unchecked")
        private B asBuilder() {
            return (B) this;
        }

        @Override
        public ValidatingPluginWithGenericBuilder build() {
            return new ValidatingPluginWithGenericBuilder(name);
        }
    }
{code}

(I have a patch for this)

(The next step (and ticket) will be to allow to use a Builder that extends another Builder.)



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