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Posted to dev@tinkerpop.apache.org by "pieter martin (JIRA)" <ji...@apache.org> on 2015/08/01 22:54:04 UTC
[jira] [Commented] (TINKERPOP3-766) Make
B_O_P_S_SE_SL_Traverser.path mutable
[ https://issues.apache.org/jira/browse/TINKERPOP3-766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14650528#comment-14650528 ]
pieter martin commented on TINKERPOP3-766:
------------------------------------------
This is not needed anymore for my usecase. As I am creating a custom traverser anyway for optimizing the GraphStep I have added setPath() on the custom traverser.
> Make B_O_P_S_SE_SL_Traverser.path mutable
> -----------------------------------------
>
> Key: TINKERPOP3-766
> URL: https://issues.apache.org/jira/browse/TINKERPOP3-766
> Project: TinkerPop 3
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.0.0-incubating
> Reporter: pieter martin
> Assignee: Marko A. Rodriguez
>
> B_O_P_S_SE_SL_Traverser.path variable is currently immutable.
> Following on a discussion earlier on the mailing list it needs to be mutable to ensure that the path reflects the correct state when labeled steps have been collapsed into one optimized step.
> An indication of how I am using this at the moment in an optimized 'compiled' step is as follows,
> {code}
> @Override
> protected Traverser<E> processNextStart() {
> while (true) {
> if (this.iterator.hasNext()) {
> Pair<E, Map<String, Object>> next = this.iterator.next();
> E e = next.getLeft();
> Map<String, Object> labeledObjects = next.getRight();
> //split before setting the path.
> //This is because the labels must be set on a unique path for every iteration.
> Traverser.Admin<E> split = this.head.split(e, this);
> for (String label : labeledObjects.keySet()) {
> //If there are labels then it must be a B_O_P_S_SE_SL_Traverser
> B_O_P_S_SE_SL_Traverser b_o_p_s_se_sl_traverser = (B_O_P_S_SE_SL_Traverser)split;
> b_o_p_s_se_sl_traverser.setPath(split.path().extend(labeledObjects.get(label), new HashSet<>(Collections.singletonList(label))));
> }
> return split;
> } else {
> this.head = this.starts.next();
> this.iterator = this.flatMapCustom(this.head);
> }
> }
> }
> {code}
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