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Posted to commits@flink.apache.org by mb...@apache.org on 2014/12/05 18:26:08 UTC
[03/34] incubator-flink git commit: [streaming] Introduced extractor
interface to enable flexible handling of arbitrary input data types.
[streaming] Introduced extractor interface to enable flexible handling of arbitrary input data types.
Project: http://git-wip-us.apache.org/repos/asf/incubator-flink/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-flink/commit/40c3ae48
Tree: http://git-wip-us.apache.org/repos/asf/incubator-flink/tree/40c3ae48
Diff: http://git-wip-us.apache.org/repos/asf/incubator-flink/diff/40c3ae48
Branch: refs/heads/master
Commit: 40c3ae481f538cebe7ecb265a796474e07517eee
Parents: d731b3b
Author: Jonas Traub (powibol) <jo...@s-traub.com>
Authored: Mon Oct 27 13:29:38 2014 +0100
Committer: mbalassi <mb...@apache.org>
Committed: Fri Dec 5 16:45:08 2014 +0100
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.../api/windowing/extractor/Extractor.java | 43 ++++++++++++++++++++
1 file changed, 43 insertions(+)
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http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/40c3ae48/flink-addons/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/windowing/extractor/Extractor.java
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diff --git a/flink-addons/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/windowing/extractor/Extractor.java b/flink-addons/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/windowing/extractor/Extractor.java
new file mode 100644
index 0000000..b103ca3
--- /dev/null
+++ b/flink-addons/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/windowing/extractor/Extractor.java
@@ -0,0 +1,43 @@
+/*
+ * 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.streaming.api.windowing.extractor;
+
+import java.io.Serializable;
+
+/**
+ * Extractors allow to extract/convert one type to another. They are mostly used
+ * to extract some fields out of a more complex structure (Tuple/Array) to run
+ * further calculation on the extraction result.
+ *
+ * @param <FROM>
+ * The input data type.
+ * @param <TO>
+ * The output data type.
+ */
+public interface Extractor<FROM, TO> extends Serializable {
+
+ /**
+ * Extracts/Converts the given input to an object of the output type
+ *
+ * @param in
+ * the input data
+ * @return the extracted/converted data
+ */
+ public TO extract(FROM in);
+
+}