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Marko A. Rodriguez edited comment on TINKERPOP-1237 at 3/24/16 2:47 AM:
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This ticket should also add {{by()}}-modulation {{TraversalRings}} to
{{PropertyMapStep}}. Also, if still efficient, {{PropertyMapStep}} should
extend {{ProjectStep}} and thus, the concept of "forward projection" is born.
* {{select()}}: backwards selection (indefinitely into the past)
* {{step()}]: forward projection (one step in the future)
* {{project()}}: forward projection (indefinitely into the future)
A whole new dimension of thinking here. This categorization of steps is
orthogonal to the {{map}}, {{flatMap}}, {{filter}}, {{sideEffect}}
categorization.
was (Author: okram):
This ticket should also add {{by()}}-modulation {{TraversalRings}} to
{{PropertyMapStep}}. Also, if still efficient, {{PropertyMapStep}} should
extend {{ProjectMapStep}} and thus, the concept of "forward projection" is born.
* {{select()}}: backwards selection (indefinitely into the past)
* {{step()}]: forward projection (one step in the future)
* {{project()}}: forward projection (indefinitely into the future)
A whole new dimension of thinking here. This categorization of steps is
orthogonal to the {{map}}, {{flatMap}}, {{filter}}, {{sideEffect}}
categorization.
> ProjectMap: For the Love of Die Faterland
> -----------------------------------------
>
> Key: TINKERPOP-1237
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1237
> Project: TinkerPop
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.1.1-incubating
> Reporter: Marko A. Rodriguez
> Assignee: Daniel Kuppitz
>
> {code}
> gremlin> g.V(1).out("knows").
> project("a","b").by("name").by(outE().count())
> ==>{a:josh, b:2}
> ==>{a:vadas, b:0}
> {code}
> Its like {{select()}} by inverted -- thus, {{project()}}! Moreover, its a
> generalization of {{valueMap()}} and {{propertyMap}}.
> {code}
> public class ProjectStep<S,E> extends MapStep<S,Map<String,E>> {
> TraversalRing<S,E> ...
> String... keys;
> public Map<String,E> map(final Traverser.Admin<S> traverser) {
> final Map<String,E> result = new HashMap<>(keys.length);
> for(final String key : keys) {
> result.put(key, TraversalUtil.apply(traverser, traversalRing.next());
> }
> traversalRing.reset();
> return result;
> }
> }
> {code}
> cc/ Mein Obergruppenführer [~mbroecheler].
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