This is an automated email from the ASF dual-hosted git repository.
dkuppitz pushed a commit to branch TINKERPOP-1084
in repository https://gitbox.apache.org/repos/asf/tinkerpop.git
commit ce46f623b42af72d5fe3ad930655ebdc8142bcf5
Author: Daniel Kuppitz <daniel_kupp...@hotmail.com>
AuthorDate: Mon Jun 10 12:45:16 2019 -0700
TINKERPOP-1084 Allow predicates to be used as options in BranchSteps.
---
CHANGELOG.asciidoc | 1 +
.../process/traversal/step/branch/BranchStep.java | 102 ++++++++++++++++-----
.../process/traversal/step/ComplexTest.java | 58 +++++++++---
.../tinkergraph/structure/TinkerGraphPlayTest.java | 22 +++--
4 files changed, 141 insertions(+), 42 deletions(-)
diff --git a/CHANGELOG.asciidoc b/CHANGELOG.asciidoc
index e60b668..226c536 100644
--- a/CHANGELOG.asciidoc
+++ b/CHANGELOG.asciidoc
@@ -33,6 +33,7 @@
image::https://raw.githubusercontent.com/apache/tinkerpop/master/docs/static/ima
* Fixed bug in `MatchStep` where the correct was not properly determined.
* Fixed bug where client/server exception mismatch when server throw
StackOverflowError
* Prevent exception when closing a session that doesn't exist
+* Allow predicates to be used as options in BranchSteps.
[[release-3-3-7]]
=== TinkerPop 3.3.7 (Release Date: May 28, 2019)
diff --git
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/branch/BranchStep.java
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/branch/BranchStep.java
index e35d51e..efc43cc 100644
---
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/branch/BranchStep.java
+++
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/branch/BranchStep.java
@@ -38,18 +38,23 @@ import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
+import java.util.Objects;
import java.util.Set;
+import java.util.function.Predicate;
import java.util.stream.Collectors;
/**
* @author Marko A. Rodriguez (http://markorodriguez.com)
+ * @author Daniel Kuppitz (http://gremlin.guru)
*/
public class BranchStep<S, E, M> extends ComputerAwareStep<S, E> implements
TraversalOptionParent<M, S, E> {
protected Traversal.Admin<S, M> branchTraversal;
protected Map<Object, List<Traversal.Admin<S, E>>> traversalOptions = new
HashMap<>();
+
private boolean first = true;
- private boolean hasBarrier = false;
+ private boolean hasBarrier;
+ private boolean hasPredicateOptions;
public BranchStep(final Traversal.Admin traversal) {
super(traversal);
@@ -61,7 +66,8 @@ public class BranchStep<S, E, M> extends ComputerAwareStep<S,
E> implements Trav
@Override
public void addGlobalChildOption(final M pickToken, final
Traversal.Admin<S, E> traversalOption) {
- final Object pickTokenKey = PickTokenKey.make(pickToken);
+ final Object pickTokenKey = makePickTokenKey(pickToken);
+ this.hasPredicateOptions |= pickTokenKey instanceof PredicateOption;
if (this.traversalOptions.containsKey(pickTokenKey))
this.traversalOptions.get(pickTokenKey).add(traversalOption);
else
@@ -138,14 +144,13 @@ public class BranchStep<S, E, M> extends
ComputerAwareStep<S, E> implements Trav
private void applyCurrentTraverser(final Traverser.Admin<S> start) {
// first get the value of the choice based on the current traverser
and use that to select the right traversal
// option to which that traverser should be routed
- final Object choice = PickTokenKey.make(TraversalUtil.apply(start,
this.branchTraversal));
- final List<Traversal.Admin<S, E>> branch =
this.traversalOptions.containsKey(choice) ?
- this.traversalOptions.get(choice) :
this.traversalOptions.get(Pick.none);
+ final Object choice = makePickTokenKey(TraversalUtil.apply(start,
this.branchTraversal));
+ final List<Traversal.Admin<S, E>> branches = pickBranches(choice);
// if a branch is identified, then split the traverser and add it to
the start of the option so that when
// that option is iterated (in the calling method) that value can be
applied.
- if (null != branch)
- branch.forEach(traversal -> traversal.addStart(start.split()));
+ if (null != branches)
+ branches.forEach(traversal -> traversal.addStart(start.split()));
if (choice != Pick.any) {
final List<Traversal.Admin<S, E>> anyBranch =
this.traversalOptions.get(Pick.any);
@@ -158,10 +163,10 @@ public class BranchStep<S, E, M> extends
ComputerAwareStep<S, E> implements Trav
protected Iterator<Traverser.Admin<E>> computerAlgorithm() {
final List<Traverser.Admin<E>> ends = new ArrayList<>();
final Traverser.Admin<S> start = this.starts.next();
- final Object choice = PickTokenKey.make(TraversalUtil.apply(start,
this.branchTraversal));
- final List<Traversal.Admin<S, E>> branch =
this.traversalOptions.containsKey(choice) ? this.traversalOptions.get(choice) :
this.traversalOptions.get(Pick.none);
- if (null != branch) {
- branch.forEach(traversal -> {
+ final Object choice = makePickTokenKey(TraversalUtil.apply(start,
this.branchTraversal));
+ final List<Traversal.Admin<S, E>> branches = pickBranches(choice);
+ if (null != branches) {
+ branches.forEach(traversal -> {
final Traverser.Admin<E> split = (Traverser.Admin<E>)
start.split();
split.setStepId(traversal.getStartStep().getId());
//split.addLabels(this.labels);
@@ -182,6 +187,22 @@ public class BranchStep<S, E, M> extends
ComputerAwareStep<S, E> implements Trav
return ends.iterator();
}
+ private List<Traversal.Admin<S, E>> pickBranches(final Object choice) {
+ final List<Traversal.Admin<S, E>> branches = new ArrayList<>();
+ if (this.hasPredicateOptions) {
+ for (final Map.Entry<Object, List<Traversal.Admin<S, E>>> e :
this.traversalOptions.entrySet()) {
+ if (Objects.equals(e.getKey(), choice)) {
+ branches.addAll(e.getValue());
+ }
+ }
+ } else {
+ if (this.traversalOptions.containsKey(choice)) {
+ branches.addAll(this.traversalOptions.get(choice));
+ }
+ }
+ return branches.isEmpty() ? this.traversalOptions.get(Pick.none) :
branches;
+ }
+
@Override
public BranchStep<S, E, M> clone() {
final BranchStep<S, E, M> clone = (BranchStep<S, E, M>) super.clone();
@@ -230,26 +251,30 @@ public class BranchStep<S, E, M> extends
ComputerAwareStep<S, E> implements Trav
}
/**
- * PickTokenKey is basically a wrapper for numbers that are used as a
PickToken. This is
- * required in order to treat equal numbers of different data types as a
match.
+ * Converts numbers into {@link NumberOption} and predicates into {@link
PredicateOption}.
+ */
+ private static Object makePickTokenKey(final Object o) {
+ return
+ o instanceof Number ? new NumberOption((Number) o) :
+ o instanceof Predicate ? new PredicateOption((Predicate) o) :
o;
+ }
+
+ /**
+ * Wraps a single number and overrides equals/hashCode/compareTo in order
to ignore the numeric data type.
*/
- private static class PickTokenKey {
+ private static class NumberOption implements Comparable<Number> {
final Number number;
- private PickTokenKey(final Number number) {
+ NumberOption(final Number number) {
this.number = number;
}
- static Object make(final Object value) {
- return value instanceof Number ? new PickTokenKey((Number) value)
: value;
- }
-
@Override
public boolean equals(final Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
- final PickTokenKey other = (PickTokenKey) o;
+ final NumberOption other = (NumberOption) o;
return 0 == NumberHelper.compare(number, other.number);
}
@@ -262,5 +287,40 @@ public class BranchStep<S, E, M> extends
ComputerAwareStep<S, E> implements Trav
public String toString() {
return number.toString();
}
+
+ @Override
+ public int compareTo(final Number other) {
+ return NumberHelper.compare(this.number, other);
+ }
+ }
+
+ /**
+ * Wraps a single predicate and overrides equals/hashCode so that the
predicate can be matched against a concrete value.
+ */
+ private static class PredicateOption {
+
+ final Predicate predicate;
+
+ PredicateOption(final Predicate predicate) {
+ this.predicate = predicate;
+ }
+
+ @SuppressWarnings({"EqualsWhichDoesntCheckParameterClass",
"unchecked"})
+ @Override
+ public boolean equals(final Object o) {
+ if (o instanceof PredicateOption)
+ return ((PredicateOption) o).predicate.equals(predicate);
+ return predicate.test(o);
+ }
+
+ @Override
+ public int hashCode() {
+ return 0;
+ }
+
+ @Override
+ public String toString() {
+ return predicate.toString();
+ }
}
-}
+}
\ No newline at end of file
diff --git
a/gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/ComplexTest.java
b/gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/ComplexTest.java
index 75dd0f5..a3bb1cd 100644
---
a/gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/ComplexTest.java
+++
b/gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/ComplexTest.java
@@ -44,24 +44,14 @@ import java.util.Map;
import static java.util.Collections.emptyList;
import static org.apache.tinkerpop.gremlin.LoadGraphWith.GraphData.MODERN;
import static org.apache.tinkerpop.gremlin.process.traversal.P.eq;
+import static org.apache.tinkerpop.gremlin.process.traversal.P.gte;
import static org.apache.tinkerpop.gremlin.process.traversal.P.lt;
import static org.apache.tinkerpop.gremlin.process.traversal.P.neq;
import static org.apache.tinkerpop.gremlin.process.traversal.Pop.all;
import static org.apache.tinkerpop.gremlin.process.traversal.Pop.first;
import static org.apache.tinkerpop.gremlin.process.traversal.Pop.last;
import static org.apache.tinkerpop.gremlin.process.traversal.Scope.local;
-import static org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.both;
-import static
org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.constant;
-import static
org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.count;
-import static
org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.group;
-import static org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.in;
-import static org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.out;
-import static org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.outE;
-import static
org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.project;
-import static
org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.select;
-import static
org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.unfold;
-import static
org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.values;
-import static
org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.where;
+import static org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.*;
import static org.apache.tinkerpop.gremlin.structure.Column.keys;
import static org.apache.tinkerpop.gremlin.structure.Column.values;
import static org.junit.Assert.assertEquals;
@@ -86,6 +76,8 @@ public abstract class ComplexTest extends
AbstractGremlinProcessTest {
public abstract Traversal<Vertex, Map<String, List<String>>>
getPlaylistPaths();
+ public abstract Traversal<Vertex, Map<String, List<String>>>
getAgeComments();
+
/**
* Checks the result of both coworkerSummary tests, which is expected to
look as follows:
* <p>
@@ -243,6 +235,31 @@ public abstract class ComplexTest extends
AbstractGremlinProcessTest {
assertTrue(map.get("artists").contains("Grateful_Dead"));
}
+ @Test
+ @LoadGraphWith(LoadGraphWith.GraphData.MODERN)
+ public void ageComments() {
+ final Traversal<Vertex, Map<String, List<String>>> traversal =
getAgeComments();
+ printTraversalForm(traversal);
+ assertTrue(traversal.hasNext());
+ Map<String, List<String>> map = traversal.next();
+ assertEquals(4, map.size());
+ assertTrue(map.containsKey("marko"));
+ assertEquals(2, map.get("marko").size());
+ assertTrue(map.get("marko").contains("almost old"));
+ assertTrue(map.get("marko").contains("younger than peter"));
+ assertTrue(map.containsKey("vadas"));
+ assertEquals(2, map.get("vadas").size());
+ assertTrue(map.get("vadas").contains("pretty young"));
+ assertTrue(map.get("vadas").contains("younger than peter"));
+ assertTrue(map.containsKey("josh"));
+ assertEquals(2, map.get("josh").size());
+ assertTrue(map.get("josh").contains("younger than peter"));
+ assertTrue(map.get("josh").contains("pretty old"));
+ assertTrue(map.containsKey("peter"));
+ assertEquals(1, map.get("peter").size());
+ assertTrue(map.get("peter").contains("pretty old"));
+ }
+
public static class Traversals extends ComplexTest {
@Override
@@ -265,7 +282,7 @@ public abstract class ComplexTest extends
AbstractGremlinProcessTest {
public Traversal<Vertex, Map<String, Map<String, Map<String,
Object>>>> getCoworkerSummary() {
return
g.V().hasLabel("person").filter(outE("created")).aggregate("p").as("p1").values("name").as("p1n")
.select("p").unfold().where(neq("p1")).as("p2").values("name").as("p2n").select("p2")
- .out("created").choose(in("created").where(eq("p1")),
values("name"), constant(emptyList()))
+ .out("created").choose(in("created").where(eq("p1")),
__.values("name"), constant(emptyList()))
.<String, Map<String, Map<String,
Object>>>group().by(select("p1n")).
by(group().by(select("p2n")).
by(unfold().fold().project("numCoCreated",
"coCreated").by(count(local)).by()));
@@ -323,6 +340,17 @@ public abstract class ComplexTest extends
AbstractGremlinProcessTest {
by("name").
by(__.coalesce(out("sungBy",
"writtenBy").dedup().values("name"), constant("Unknown")).fold());
}
- }
-}
+ @Override
+ public Traversal<Vertex, Map<String, List<String>>> getAgeComments() {
+ return g.V().hasLabel("person")
+ .<String, List<String>> group()
+ .by("name")
+ .by(branch(__.values("age"))
+ .option(29, constant("almost old"))
+ .option(lt(29), constant("pretty young"))
+ .option(lt(35), constant("younger than peter"))
+ .option(gte(30), constant("pretty
old")).fold());
+ }
+ }
+}
\ No newline at end of file
diff --git
a/tinkergraph-gremlin/src/test/java/org/apache/tinkerpop/gremlin/tinkergraph/structure/TinkerGraphPlayTest.java
b/tinkergraph-gremlin/src/test/java/org/apache/tinkerpop/gremlin/tinkergraph/structure/TinkerGraphPlayTest.java
index d4f7d5d..3b241bc 100644
---
a/tinkergraph-gremlin/src/test/java/org/apache/tinkerpop/gremlin/tinkergraph/structure/TinkerGraphPlayTest.java
+++
b/tinkergraph-gremlin/src/test/java/org/apache/tinkerpop/gremlin/tinkergraph/structure/TinkerGraphPlayTest.java
@@ -27,6 +27,7 @@ import
org.apache.tinkerpop.gremlin.process.traversal.Traverser;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal;
import
org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__;
+import
org.apache.tinkerpop.gremlin.process.traversal.step.TraversalOptionParent;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.EarlyLimitStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.PathRetractionStrategy;
import org.apache.tinkerpop.gremlin.structure.*;
@@ -45,6 +46,10 @@ import java.util.function.BiFunction;
import java.util.function.Supplier;
import static org.apache.tinkerpop.gremlin.process.traversal.Operator.sum;
+import static org.apache.tinkerpop.gremlin.process.traversal.P.between;
+import static org.apache.tinkerpop.gremlin.process.traversal.P.gt;
+import static org.apache.tinkerpop.gremlin.process.traversal.P.gte;
+import static org.apache.tinkerpop.gremlin.process.traversal.P.lt;
import static org.apache.tinkerpop.gremlin.process.traversal.P.neq;
import static org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.*;
@@ -124,12 +129,17 @@ public class TinkerGraphPlayTest {
@Ignore
public void testPlayDK() throws Exception {
- final GraphTraversalSource g =
TinkerFactory.createModern().traversal();
- g.V().match(
- __.as("b").out("created").as("c"),
- __.as("a").hasLabel("person"),
- __.as("b").hasLabel("person"),
-
__.as("a").out("knows").as("b")).forEachRemaining(System.out::println);
+ GraphTraversalSource g = TinkerFactory.createModern().traversal();
+ g./*withComputer().*/V().hasLabel("person")
+ .project("name", "age", "comments")
+ .by("name")
+ .by("age")
+ .by(branch(values("age"))
+ .option(29, constant("almost old"))
+ .option(lt(29), constant("pretty young"))
+ .option(lt(35), constant("younger than peter"))
+ .option(gte(30), constant("pretty old")).fold())
+ .forEachRemaining(System.out::println);
}
@Test
