Github user stain commented on the issue:
https://github.com/apache/commons-rdf/pull/43
Thanks, @ajs6f !
I found some old code where I had tried to make a fluent interface.. I
managed to update it to the current master and sorted some issues.
I pushed it to the `fluent-parser` branch
See https://github.com/apache/commons-rdf/compare/fluent-parser
I haven't implemented the `Parser` yet or written any tests.
Basically the idea is this:
```java
Parsed<Dataset, IRI> p = rdf.parserBuilder()
.syntax(RDFSyntax.JSONLD)
.source("http://example.com/data.jsonld";)
.parse();
```
or:
```java
rdf.parserBuilder()
.syntax(RDFSyntax.TURTLE)
.target(quad -> System.out.println(quad.getSubject()))
.source(Paths.get("/tmp/file.ttl").
.async().parseAsync();
```
Now there is a set of interfaces, one for each step along the way, e.g.
`NeedTarget`, and
some internal `_` package interfaces to ensure consistency (but this can be
flattened). Note that it is easier in this code to explore this in Eclipse with
auto-complete as the interfaces have not been flattened yet.
It is implemented by a single `AbstractParserBuilder` which keeps all its
state (except async executor) in a `ParserConfig` bean. The builder can be made
immutable using `.build()` after which any change will make it mutable again.
While it's mutable it will mutate the bean without any copies.
There is also a more low-level `Parser` which takes a `ParserConfig` - this
is basically how the RDF implementations can be invoked.
I have not moved over the preflight checks in AbstractRDFParser there.
Feel free to use it as a starting ground or inspiration! It's quite hard to
do fluent interfaces..
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