[tinkerpop] 01/01: Implemented EdgeLabelVerificationStrategy
This is an automated email from the ASF dual-hosted git repository.
dkuppitz pushed a commit to branch TINKERPOP-2191
in repository https://gitbox.apache.org/repos/asf/tinkerpop.git
commit 0769976c267183ffb9aa22ab9a379d7163e70d84
Author: Daniel Kuppitz
AuthorDate: Thu Mar 14 15:05:09 2019 -0700
Implemented EdgeLabelVerificationStrategy
---
CHANGELOG.asciidoc | 2 +-
docs/src/upgrade/release-3.3.x.asciidoc| 38 +
.../tinkerpop/gremlin/jsr223/CoreImports.java | 2 +
.../EdgeLabelVerificationStrategy.java | 131 ++
.../structure/io/graphson/GraphSONModule.java | 5 +
.../gremlin/structure/io/gryo/GryoVersion.java | 7 +-
.../EdgeLabelVerificationStrategyTest.java | 188 +
7 files changed, 370 insertions(+), 3 deletions(-)
diff --git a/CHANGELOG.asciidoc b/CHANGELOG.asciidoc
index 88df8ad..106761a 100644
--- a/CHANGELOG.asciidoc
+++ b/CHANGELOG.asciidoc
@@ -24,7 +24,7 @@
image::https://raw.githubusercontent.com/apache/tinkerpop/master/docs/static/ima
=== TinkerPop 3.3.7 (Release Date: NOT OFFICIALLY RELEASED YET)
* Ensure `gremlin.sh` works when directories contain spaces
-
+* Implemented `EdgeLabelVerificationStrategy`
[[release-3-3-6]]
=== TinkerPop 3.3.6 (Release Date: March 18, 2019)
diff --git a/docs/src/upgrade/release-3.3.x.asciidoc
b/docs/src/upgrade/release-3.3.x.asciidoc
index c1911d3..a5ece72 100644
--- a/docs/src/upgrade/release-3.3.x.asciidoc
+++ b/docs/src/upgrade/release-3.3.x.asciidoc
@@ -27,6 +27,44 @@
image::https://raw.githubusercontent.com/apache/tinkerpop/master/docs/static/ima
Please see the
link:https://github.com/apache/tinkerpop/blob/3.3.7/CHANGELOG.asciidoc#release-3-3-7[changelog]
for a complete list of all the modifications that are part of this release.
+=== Upgrading for Providers
+
+ Detection of Anti-Patterns
+
+This release adds a strategy named `EdgeLabelVerificationStrategy`. The
strategy will not be added by default to the traversal source, however,
providers can add it explicitly to encourage (or enforce)
+users to always specify at least one edge label.
`EdgeLabelVerificationStrategy` can be configured to either throw an exception
if no edge label was specified, log a warning or do both.
+
+[source,text]
+
+gremlin> // throw an exception if edge label was not specified
+gremlin> g =
TinkerFactory.createModern().traversal().withStrategies(EdgeLabelVerificationStrategy.build().throwException().create())
+==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
+gremlin> g.V(1).out('knows')
+==>v[2]
+==>v[4]
+gremlin> g.V(1).out()
+The provided traversal contains a vertex step without any specified edge
label: VertexStep(OUT,vertex)
+Type ':help' or ':h' for help.
+Display stack trace? [yN]
+
+
+[source,text]
+
+gremlin> // log a warning if edge label was not specified (Log4j has to be
configured properly)
+gremlin> g =
TinkerFactory.createModern().traversal().withStrategies(EdgeLabelVerificationStrategy.build().logWarning().create())
+==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
+gremlin> g.V(1).out('knows')
+==>v[2]
+==>v[4]
+gremlin> g.V(1).out()
+WARN
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.EdgeLabelVerificationStrategy
- The provided traversal contains a vertex step without any specified edge
label: VertexStep(OUT,vertex)
+==>v[3]
+==>v[2]
+==>v[4]
+
+
+See: link:https://issues.apache.org/jira/browse/TINKERPOP-2191[TINKERPOP-2191]
+
== TinkerPop 3.3.6
*Release Date: March 18, 2019*
diff --git
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
index 576d0de..e298951 100644
---
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
+++
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
@@ -86,6 +86,7 @@ import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.Orde
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.PathProcessorStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.CountStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.ComputerVerificationStrategy;
+import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.EdgeLabelVerificationStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.LambdaRestrictionStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.ReadOnlyStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.StandardVerificationStrategy;
@@ -241,6 +242,7 @@ public final class CoreImports {
CLASS_IMPORTS.add(LambdaRestrictionStrategy.class);
CLASS_IMPORTS.add(ReadOnlyStrategy.class);
[tinkerpop] 01/01: Implemented EdgeLabelVerificationStrategy
This is an automated email from the ASF dual-hosted git repository.
dkuppitz pushed a commit to branch TINKERPOP-2191
in repository https://gitbox.apache.org/repos/asf/tinkerpop.git
commit 402e5401ddd5e4898013b972842d0db781664147
Author: Daniel Kuppitz
AuthorDate: Thu Mar 14 15:05:09 2019 -0700
Implemented EdgeLabelVerificationStrategy
---
CHANGELOG.asciidoc | 2 +-
docs/src/upgrade/release-3.3.x.asciidoc| 38 +
.../tinkerpop/gremlin/jsr223/CoreImports.java | 2 +
.../EdgeLabelVerificationStrategy.java | 130 ++
.../structure/io/graphson/GraphSONModule.java | 5 +
.../gremlin/structure/io/gryo/GryoVersion.java | 7 +-
.../EdgeLabelVerificationStrategyTest.java | 188 +
7 files changed, 369 insertions(+), 3 deletions(-)
diff --git a/CHANGELOG.asciidoc b/CHANGELOG.asciidoc
index 88df8ad..106761a 100644
--- a/CHANGELOG.asciidoc
+++ b/CHANGELOG.asciidoc
@@ -24,7 +24,7 @@
image::https://raw.githubusercontent.com/apache/tinkerpop/master/docs/static/ima
=== TinkerPop 3.3.7 (Release Date: NOT OFFICIALLY RELEASED YET)
* Ensure `gremlin.sh` works when directories contain spaces
-
+* Implemented `EdgeLabelVerificationStrategy`
[[release-3-3-6]]
=== TinkerPop 3.3.6 (Release Date: March 18, 2019)
diff --git a/docs/src/upgrade/release-3.3.x.asciidoc
b/docs/src/upgrade/release-3.3.x.asciidoc
index c1911d3..a5ece72 100644
--- a/docs/src/upgrade/release-3.3.x.asciidoc
+++ b/docs/src/upgrade/release-3.3.x.asciidoc
@@ -27,6 +27,44 @@
image::https://raw.githubusercontent.com/apache/tinkerpop/master/docs/static/ima
Please see the
link:https://github.com/apache/tinkerpop/blob/3.3.7/CHANGELOG.asciidoc#release-3-3-7[changelog]
for a complete list of all the modifications that are part of this release.
+=== Upgrading for Providers
+
+ Detection of Anti-Patterns
+
+This release adds a strategy named `EdgeLabelVerificationStrategy`. The
strategy will not be added by default to the traversal source, however,
providers can add it explicitly to encourage (or enforce)
+users to always specify at least one edge label.
`EdgeLabelVerificationStrategy` can be configured to either throw an exception
if no edge label was specified, log a warning or do both.
+
+[source,text]
+
+gremlin> // throw an exception if edge label was not specified
+gremlin> g =
TinkerFactory.createModern().traversal().withStrategies(EdgeLabelVerificationStrategy.build().throwException().create())
+==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
+gremlin> g.V(1).out('knows')
+==>v[2]
+==>v[4]
+gremlin> g.V(1).out()
+The provided traversal contains a vertex step without any specified edge
label: VertexStep(OUT,vertex)
+Type ':help' or ':h' for help.
+Display stack trace? [yN]
+
+
+[source,text]
+
+gremlin> // log a warning if edge label was not specified (Log4j has to be
configured properly)
+gremlin> g =
TinkerFactory.createModern().traversal().withStrategies(EdgeLabelVerificationStrategy.build().logWarning().create())
+==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
+gremlin> g.V(1).out('knows')
+==>v[2]
+==>v[4]
+gremlin> g.V(1).out()
+WARN
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.EdgeLabelVerificationStrategy
- The provided traversal contains a vertex step without any specified edge
label: VertexStep(OUT,vertex)
+==>v[3]
+==>v[2]
+==>v[4]
+
+
+See: link:https://issues.apache.org/jira/browse/TINKERPOP-2191[TINKERPOP-2191]
+
== TinkerPop 3.3.6
*Release Date: March 18, 2019*
diff --git
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
index 576d0de..e298951 100644
---
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
+++
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
@@ -86,6 +86,7 @@ import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.Orde
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.PathProcessorStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.CountStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.ComputerVerificationStrategy;
+import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.EdgeLabelVerificationStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.LambdaRestrictionStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.ReadOnlyStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.StandardVerificationStrategy;
@@ -241,6 +242,7 @@ public final class CoreImports {
CLASS_IMPORTS.add(LambdaRestrictionStrategy.class);
CLASS_IMPORTS.add(ReadOnlyStrategy.class);
[tinkerpop] 01/01: Implemented EdgeLabelVerificationStrategy
This is an automated email from the ASF dual-hosted git repository.
dkuppitz pushed a commit to branch TINKERPOP-2191
in repository https://gitbox.apache.org/repos/asf/tinkerpop.git
commit ce7c5ea4503c651210cc7e4dfb444eadb0df9099
Author: Daniel Kuppitz
AuthorDate: Thu Mar 14 15:05:09 2019 -0700
Implemented EdgeLabelVerificationStrategy
---
CHANGELOG.asciidoc | 2 +-
docs/src/upgrade/release-3.3.x.asciidoc| 38 +
.../tinkerpop/gremlin/jsr223/CoreImports.java | 2 +
.../EdgeLabelVerificationStrategy.java | 130 ++
.../structure/io/graphson/GraphSONModule.java | 5 +
.../gremlin/structure/io/gryo/GryoVersion.java | 7 +-
.../EdgeLabelVerificationStrategyTest.java | 188 +
7 files changed, 369 insertions(+), 3 deletions(-)
diff --git a/CHANGELOG.asciidoc b/CHANGELOG.asciidoc
index 88df8ad..106761a 100644
--- a/CHANGELOG.asciidoc
+++ b/CHANGELOG.asciidoc
@@ -24,7 +24,7 @@
image::https://raw.githubusercontent.com/apache/tinkerpop/master/docs/static/ima
=== TinkerPop 3.3.7 (Release Date: NOT OFFICIALLY RELEASED YET)
* Ensure `gremlin.sh` works when directories contain spaces
-
+* Implemented `EdgeLabelVerificationStrategy`
[[release-3-3-6]]
=== TinkerPop 3.3.6 (Release Date: March 18, 2019)
diff --git a/docs/src/upgrade/release-3.3.x.asciidoc
b/docs/src/upgrade/release-3.3.x.asciidoc
index c1911d3..a5ece72 100644
--- a/docs/src/upgrade/release-3.3.x.asciidoc
+++ b/docs/src/upgrade/release-3.3.x.asciidoc
@@ -27,6 +27,44 @@
image::https://raw.githubusercontent.com/apache/tinkerpop/master/docs/static/ima
Please see the
link:https://github.com/apache/tinkerpop/blob/3.3.7/CHANGELOG.asciidoc#release-3-3-7[changelog]
for a complete list of all the modifications that are part of this release.
+=== Upgrading for Providers
+
+ Detection of Anti-Patterns
+
+This release adds a strategy named `EdgeLabelVerificationStrategy`. The
strategy will not be added by default to the traversal source, however,
providers can add it explicitly to encourage (or enforce)
+users to always specify at least one edge label.
`EdgeLabelVerificationStrategy` can be configured to either throw an exception
if no edge label was specified, log a warning or do both.
+
+[source,text]
+
+gremlin> // throw an exception if edge label was not specified
+gremlin> g =
TinkerFactory.createModern().traversal().withStrategies(EdgeLabelVerificationStrategy.build().throwException().create())
+==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
+gremlin> g.V(1).out('knows')
+==>v[2]
+==>v[4]
+gremlin> g.V(1).out()
+The provided traversal contains a vertex step without any specified edge
label: VertexStep(OUT,vertex)
+Type ':help' or ':h' for help.
+Display stack trace? [yN]
+
+
+[source,text]
+
+gremlin> // log a warning if edge label was not specified (Log4j has to be
configured properly)
+gremlin> g =
TinkerFactory.createModern().traversal().withStrategies(EdgeLabelVerificationStrategy.build().logWarning().create())
+==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
+gremlin> g.V(1).out('knows')
+==>v[2]
+==>v[4]
+gremlin> g.V(1).out()
+WARN
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.EdgeLabelVerificationStrategy
- The provided traversal contains a vertex step without any specified edge
label: VertexStep(OUT,vertex)
+==>v[3]
+==>v[2]
+==>v[4]
+
+
+See: link:https://issues.apache.org/jira/browse/TINKERPOP-2191[TINKERPOP-2191]
+
== TinkerPop 3.3.6
*Release Date: March 18, 2019*
diff --git
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
index 576d0de..e298951 100644
---
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
+++
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
@@ -86,6 +86,7 @@ import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.Orde
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.PathProcessorStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.CountStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.ComputerVerificationStrategy;
+import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.EdgeLabelVerificationStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.LambdaRestrictionStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.ReadOnlyStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.StandardVerificationStrategy;
@@ -241,6 +242,7 @@ public final class CoreImports {
CLASS_IMPORTS.add(LambdaRestrictionStrategy.class);
CLASS_IMPORTS.add(ReadOnlyStrategy.class);
[tinkerpop] 01/01: Implemented EdgeLabelVerificationStrategy
This is an automated email from the ASF dual-hosted git repository.
dkuppitz pushed a commit to branch TINKERPOP-2191
in repository https://gitbox.apache.org/repos/asf/tinkerpop.git
commit ee7433c076a7cc0d36fa3566d622bbe96a3d308f
Author: Daniel Kuppitz
AuthorDate: Thu Mar 14 15:05:09 2019 -0700
Implemented EdgeLabelVerificationStrategy
---
.../tinkerpop/gremlin/jsr223/CoreImports.java | 2 +
.../EdgeLabelVerificationStrategy.java | 130 ++
.../structure/io/graphson/GraphSONModule.java | 5 +
.../gremlin/structure/io/gryo/GryoVersion.java | 7 +-
.../EdgeLabelVerificationStrategyTest.java | 188 +
5 files changed, 330 insertions(+), 2 deletions(-)
diff --git
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
index 576d0de..e298951 100644
---
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
+++
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
@@ -86,6 +86,7 @@ import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.Orde
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.PathProcessorStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.CountStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.ComputerVerificationStrategy;
+import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.EdgeLabelVerificationStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.LambdaRestrictionStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.ReadOnlyStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.StandardVerificationStrategy;
@@ -241,6 +242,7 @@ public final class CoreImports {
CLASS_IMPORTS.add(LambdaRestrictionStrategy.class);
CLASS_IMPORTS.add(ReadOnlyStrategy.class);
CLASS_IMPORTS.add(StandardVerificationStrategy.class);
+CLASS_IMPORTS.add(EdgeLabelVerificationStrategy.class);
// graph traversal
CLASS_IMPORTS.add(AnonymousTraversalSource.class);
CLASS_IMPORTS.add(__.class);
diff --git
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/verification/EdgeLabelVerificationStrategy.java
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/verification/EdgeLabelVerificationStrategy.java
new file mode 100644
index 000..a4fd804
--- /dev/null
+++
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/verification/EdgeLabelVerificationStrategy.java
@@ -0,0 +1,130 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tinkerpop.gremlin.process.traversal.strategy.verification;
+
+import org.apache.commons.configuration.Configuration;
+import org.apache.commons.configuration.MapConfiguration;
+import org.apache.tinkerpop.gremlin.process.traversal.Step;
+import org.apache.tinkerpop.gremlin.process.traversal.Traversal;
+import org.apache.tinkerpop.gremlin.process.traversal.TraversalStrategy;
+import org.apache.tinkerpop.gremlin.process.traversal.step.map.VertexStep;
+import
org.apache.tinkerpop.gremlin.process.traversal.strategy.AbstractTraversalStrategy;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * {@code EdgeLabelVerificationStrategy} does not allow edge traversal steps
to have no label specified.
+ * Providing one or more labels is considered to be a best practice, however,
TinkerPop will not force the specification
+ * of edge labels; instead, providers or users will have to enable this
strategy explicitly.
+ *
+ *
+ * @author Daniel Kuppitz (http://gremlin.guru)
+ * @example
+ * __.outE() // throws an IllegalStateException
+ * __.out()// throws an IllegalStateException
+ * __.bothE() // throws an IllegalStateException
+ * __.to(OUT) // throws an IllegalStateException
+ *
[tinkerpop] 01/01: Implemented EdgeLabelVerificationStrategy
This is an automated email from the ASF dual-hosted git repository.
dkuppitz pushed a commit to branch TINKERPOP-2191
in repository https://gitbox.apache.org/repos/asf/tinkerpop.git
commit 21bfb55e12ffd86dad9de39bbaf155ae6bac39fc
Author: Daniel Kuppitz
AuthorDate: Thu Mar 14 15:05:09 2019 -0700
Implemented EdgeLabelVerificationStrategy
---
.../tinkerpop/gremlin/jsr223/CoreImports.java | 2 +
.../EdgeLabelVerificationStrategy.java | 130 ++
.../structure/io/graphson/GraphSONModule.java | 5 +
.../gremlin/structure/io/gryo/GryoVersion.java | 7 +-
.../EdgeLabelVerificationStrategyTest.java | 188 +
5 files changed, 330 insertions(+), 2 deletions(-)
diff --git
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
index 576d0de..e298951 100644
---
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
+++
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/CoreImports.java
@@ -86,6 +86,7 @@ import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.Orde
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.PathProcessorStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.optimization.CountStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.ComputerVerificationStrategy;
+import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.EdgeLabelVerificationStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.LambdaRestrictionStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.ReadOnlyStrategy;
import
org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.StandardVerificationStrategy;
@@ -241,6 +242,7 @@ public final class CoreImports {
CLASS_IMPORTS.add(LambdaRestrictionStrategy.class);
CLASS_IMPORTS.add(ReadOnlyStrategy.class);
CLASS_IMPORTS.add(StandardVerificationStrategy.class);
+CLASS_IMPORTS.add(EdgeLabelVerificationStrategy.class);
// graph traversal
CLASS_IMPORTS.add(AnonymousTraversalSource.class);
CLASS_IMPORTS.add(__.class);
diff --git
a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/verification/EdgeLabelVerificationStrategy.java
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/verification/EdgeLabelVerificationStrategy.java
new file mode 100644
index 000..1b8876a
--- /dev/null
+++
b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/verification/EdgeLabelVerificationStrategy.java
@@ -0,0 +1,130 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tinkerpop.gremlin.process.traversal.strategy.verification;
+
+import org.apache.commons.configuration.Configuration;
+import org.apache.commons.configuration.MapConfiguration;
+import org.apache.tinkerpop.gremlin.process.traversal.Step;
+import org.apache.tinkerpop.gremlin.process.traversal.Traversal;
+import org.apache.tinkerpop.gremlin.process.traversal.TraversalStrategy;
+import org.apache.tinkerpop.gremlin.process.traversal.step.map.VertexStep;
+import
org.apache.tinkerpop.gremlin.process.traversal.strategy.AbstractTraversalStrategy;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * {@code EdgeLabelVerificationStrategy} does not allow edge traversal steps
to have no label specified.
+ * Providing one or more labels is considered to be a best practice, however,
TinkerPop will not force the specification
+ * of edge labels; instead, providers or users will have to enable this
strategy explicitly.
+ *
+ *
+ * @author Daniel Kujppitz (http://gremlin.guru)
+ * @example
+ * __.outE() // throws an IllegalStateException
+ * __.out()// throws an IllegalStateException
+ * __.bothE() // throws an IllegalStateException
+ * __.to(OUT) // throws an IllegalStateException
+ *
