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https://issues.apache.org/jira/browse/FLINK-3708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15249785#comment-15249785
]
ASF GitHub Bot commented on FLINK-3708:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/1905#discussion_r60398887
--- Diff:
flink-libraries/flink-cep-scala/src/main/scala/org/apache/flink/cep/scala/CEP.scala
---
@@ -0,0 +1,46 @@
+/*
+ * 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.flink.cep.scala
+
+import org.apache.flink.api.common.typeinfo.TypeInformation
+import org.apache.flink.cep.scala.pattern.Pattern
+import org.apache.flink.cep.{CEP => JCEP}
+import org.apache.flink.streaming.api.scala.DataStream
+
+import scala.reflect.ClassTag
+
+/**
+ * Utility method to transform a { @link DataStream} into a { @link
PatternStream} to do CEP.
+ */
+
+object CEP {
+ /**
+ * Transforms a { @link DataStream[T]} into a { @link PatternStream[T]}
in the Scala API.
+ * See { @link org.apache.flink.cep.CEP} for a more detailed
description how the underlying
+ * Java API works.
+ *
+ * @param input DataStream containing the input events
+ * @param pattern Pattern specification which shall be detected
+ * @tparam T Type of the input events
+ * @return Resulting pattern stream
+ */
+ def pattern[T: TypeInformation : ClassTag](input: DataStream[T],
pattern: Pattern[T, _]): PatternStream[T] = {
--- End diff --
`ClassTag` not needed
> Scala API for CEP
> -----------------
>
> Key: FLINK-3708
> URL: https://issues.apache.org/jira/browse/FLINK-3708
> Project: Flink
> Issue Type: Improvement
> Components: CEP
> Affects Versions: 1.1.0
> Reporter: Till Rohrmann
> Assignee: Stefan Richter
>
> Currently, The CEP library does not support Scala case classes, because the
> {{TypeExtractor}} cannot handle them. In order to support them, it would be
> necessary to offer a Scala API for the CEP library.
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