[flink] branch master updated: [hotfix][table-common] Add a default data type visitor

[tw...@apache.org]

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twalthr pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/flink.git


The following commit(s) were added to refs/heads/master by this push:
     new 0469292  [hotfix][table-common] Add a default data type visitor
0469292 is described below

commit 0469292a4f957eba872972fc701b8fa12054582f
Author: Timo Walther <tw...@apache.org>
AuthorDate: Mon May 13 15:56:30 2019 +0200

    [hotfix][table-common] Add a default data type visitor
---
 .../table/types/utils/DataTypeDefaultVisitor.java  | 57 ++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/utils/DataTypeDefaultVisitor.java b/flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/utils/DataTypeDefaultVisitor.java
new file mode 100644
index 0000000..57ffe59
--- /dev/null
+++ b/flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/utils/DataTypeDefaultVisitor.java
@@ -0,0 +1,57 @@
+/*
+ * 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.table.types.utils;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.table.types.AtomicDataType;
+import org.apache.flink.table.types.CollectionDataType;
+import org.apache.flink.table.types.DataType;
+import org.apache.flink.table.types.DataTypeVisitor;
+import org.apache.flink.table.types.FieldsDataType;
+import org.apache.flink.table.types.KeyValueDataType;
+
+/**
+ * Implementation of {@link DataTypeVisitor} that redirects all calls to
+ * {@link DataTypeDefaultVisitor#defaultMethod(DataType)}.
+ */
+@Internal
+public abstract class DataTypeDefaultVisitor<R> implements DataTypeVisitor<R>{
+
+	@Override
+	public R visit(AtomicDataType atomicDataType) {
+		return defaultMethod(atomicDataType);
+	}
+
+	@Override
+	public R visit(CollectionDataType collectionDataType) {
+		return defaultMethod(collectionDataType);
+	}
+
+	@Override
+	public R visit(FieldsDataType fieldsDataType) {
+		return defaultMethod(fieldsDataType);
+	}
+
+	@Override
+	public R visit(KeyValueDataType keyValueDataType) {
+		return defaultMethod(keyValueDataType);
+	}
+
+	protected abstract R defaultMethod(DataType dataType);
+}