Java Code Examples for org.apache.tinkerpop.gremlin.process.traversal.step.PathProcessor#processTraverserPathLabels()

@Override
protected Traverser.Admin<E> processNextStart() {
    final Traverser.Admin<S> traverser = this.starts.next();
    final Iterator<E> keyIterator = TraversalUtil.applyAll(traverser, this.keyTraversal);
    if (keyIterator.hasNext()) {
        final E key = keyIterator.next();
        try {
            final E end = getScopeValue(pop, key, traverser);
            final Traverser.Admin<E> outTraverser = traverser.split(null == end ? null : TraversalUtil.applyNullable(end, this.selectTraversal), this);
            if (!(this.getTraversal().getParent() instanceof MatchStep)) {
                PathProcessor.processTraverserPathLabels(outTraverser, this.keepLabels);
            }
            return outTraverser;
        } catch (KeyNotFoundException nfe) {
            return EmptyTraverser.instance();
        }
    } else {
        return EmptyTraverser.instance();
    }
}
 

@Override
protected Traverser.Admin<Map<String, E>> processNextStart() throws NoSuchElementException {
    final Traverser.Admin<S> traverser = this.starts.next();
    final Map<String, E> bindings = new LinkedHashMap<>(this.selectKeys.size(), 1.0f);
    try {
        for (final String selectKey : this.selectKeys) {
            final E end = this.getScopeValue(this.pop, selectKey, traverser);
            bindings.put(selectKey, TraversalUtil.applyNullable(end, this.traversalRing.next()));
        }
    } catch (KeyNotFoundException nfe) {
        return EmptyTraverser.instance();
    } finally {
        this.traversalRing.reset();
    }

    return PathProcessor.processTraverserPathLabels(traverser.split(bindings, this), this.keepLabels);
}
 

private <S> Traverser.Admin<S> retractUnnecessaryLabels(final Traverser.Admin<S> traverser) {
    if (null == this.parent.getKeepLabels())
        return traverser;

    final Set<String> keepers = new HashSet<>(this.parent.getKeepLabels());
    final Set<String> tags = traverser.getTags();
    for (final Traversal.Admin<?, ?> matchTraversal : this.parent.matchTraversals) { // get remaining traversal patterns for the traverser
        final String startStepId = matchTraversal.getStartStep().getId();
        if (!tags.contains(startStepId)) {
            keepers.addAll(this.parent.getReferencedLabelsMap().get(startStepId)); // get the reference labels required for those remaining traversals
        }
    }
    return PathProcessor.processTraverserPathLabels(traverser, keepers); // remove all reference labels that are no longer required
}
 

@Override
protected Traverser.Admin<E> processNextStart() throws NoSuchElementException {
    final Traverser.Admin<S> traverser = this.starts.next();

    try {
        final S o = getScopeValue(pop, selectKey, traverser);
        if (null == o) return traverser.split(null, this);
        final Traverser.Admin<E> outTraverser = traverser.split(TraversalUtil.applyNullable(o, this.selectTraversal), this);
        if (!(this.getTraversal().getParent() instanceof MatchStep))
            PathProcessor.processTraverserPathLabels(outTraverser, this.keepLabels);
        return outTraverser;
    } catch (KeyNotFoundException nfe) {
        return EmptyTraverser.instance();
    }
}
 

@Override
protected Traverser.Admin<S> processNextStart() {
    if (null != this.barrier) {
        this.barrierIterator = this.barrier.entrySet().iterator();
        this.barrier = null;
    }
    while (this.barrierIterator != null && this.barrierIterator.hasNext()) {
        if (null == this.barrierIterator)
            this.barrierIterator = this.barrier.entrySet().iterator();
        final Map.Entry<Object, Traverser.Admin<S>> entry = this.barrierIterator.next();
        if (this.duplicateSet.add(entry.getKey()))
            return PathProcessor.processTraverserPathLabels(entry.getValue(), this.keepLabels);
    }
    return PathProcessor.processTraverserPathLabels(super.processNextStart(), this.keepLabels);
}
 

@Override
protected Traverser.Admin<Double> processNextStart() {
    return PathProcessor.processTraverserPathLabels(super.processNextStart(), this.keepLabels);
}
 

@Override
protected Traverser.Admin<Path> processNextStart() {
    return PathProcessor.processTraverserPathLabels(super.processNextStart(), this.keepLabels);
}
 

@Override
protected Traverser.Admin<S> processNextStart() {
    return PathProcessor.processTraverserPathLabels(super.processNextStart(), this.keepLabels);
}
 

@Override
protected Traverser.Admin<S> processNextStart() {
    return PathProcessor.processTraverserPathLabels(super.processNextStart(), this.keepLabels);
}
 

@Override
protected Traverser.Admin<S> processNextStart() {
    return PathProcessor.processTraverserPathLabels(super.processNextStart(), this.keepLabels);
}
 

@Override
protected Traverser.Admin<S> processNextStart() {
    return PathProcessor.processTraverserPathLabels(super.processNextStart(), this.keepLabels);
}
 

@Override
protected Traverser.Admin processNextStart() {
    return PathProcessor.processTraverserPathLabels(super.processNextStart(), this.keepLabels);
}