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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