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Posted to server-dev@james.apache.org by ad...@apache.org on 2017/11/15 11:15:52 UTC
[11/19] james-project git commit: PROTOCOLS-117 Add a stream helper
PROTOCOLS-117 Add a stream helper
We need a more readable way to concat (n) streams than chaining Stream.concat calls
Project: http://git-wip-us.apache.org/repos/asf/james-project/repo
Commit: http://git-wip-us.apache.org/repos/asf/james-project/commit/5c904e1e
Tree: http://git-wip-us.apache.org/repos/asf/james-project/tree/5c904e1e
Diff: http://git-wip-us.apache.org/repos/asf/james-project/diff/5c904e1e
Branch: refs/heads/master
Commit: 5c904e1ea778803c6d391c424f8ebe40317bb15b
Parents: 20a6c64
Author: benwa <bt...@linagora.com>
Authored: Wed Nov 8 11:31:26 2017 +0700
Committer: benwa <bt...@linagora.com>
Committed: Wed Nov 15 18:05:45 2017 +0700
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.../java/org/apache/james/util/StreamUtils.java | 34 +++++++++
.../org/apache/james/util/StreamUtilsTest.java | 80 ++++++++++++++++++++
2 files changed, 114 insertions(+)
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http://git-wip-us.apache.org/repos/asf/james-project/blob/5c904e1e/server/container/util-java8/src/main/java/org/apache/james/util/StreamUtils.java
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diff --git a/server/container/util-java8/src/main/java/org/apache/james/util/StreamUtils.java b/server/container/util-java8/src/main/java/org/apache/james/util/StreamUtils.java
new file mode 100644
index 0000000..f980802
--- /dev/null
+++ b/server/container/util-java8/src/main/java/org/apache/james/util/StreamUtils.java
@@ -0,0 +1,34 @@
+/****************************************************************
+ * 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.james.util;
+
+import java.util.Collection;
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+public class StreamUtils {
+ public static <T> Stream<T> flatten(Collection<Stream<T>> streams) {
+ return flatten(streams.stream());
+ }
+
+ public static <T> Stream<T> flatten(Stream<Stream<T>> streams) {
+ return streams.flatMap(Function.identity());
+ }
+}
http://git-wip-us.apache.org/repos/asf/james-project/blob/5c904e1e/server/container/util-java8/src/test/java/org/apache/james/util/StreamUtilsTest.java
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diff --git a/server/container/util-java8/src/test/java/org/apache/james/util/StreamUtilsTest.java b/server/container/util-java8/src/test/java/org/apache/james/util/StreamUtilsTest.java
new file mode 100644
index 0000000..c14cd4c
--- /dev/null
+++ b/server/container/util-java8/src/test/java/org/apache/james/util/StreamUtilsTest.java
@@ -0,0 +1,80 @@
+/****************************************************************
+ * 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.james.util;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.stream.Stream;
+
+import org.junit.Test;
+import org.testcontainers.shaded.com.google.common.collect.ImmutableList;
+
+import com.github.steveash.guavate.Guavate;
+
+public class StreamUtilsTest {
+
+ @Test
+ public void flattenShouldReturnEmptyWhenEmptyStreams() {
+ assertThat(
+ StreamUtils.<Integer>flatten(ImmutableList.of())
+ .collect(Guavate.toImmutableList()))
+ .isEmpty();
+ }
+
+ @Test
+ public void flattenShouldPreserveSingleStreams() {
+ assertThat(
+ StreamUtils.flatten(ImmutableList.of(
+ Stream.of(1, 2, 3)))
+ .collect(Guavate.toImmutableList()))
+ .containsExactly(1, 2, 3);
+ }
+
+ @Test
+ public void flattenShouldMergeSeveralStreamsTogether() {
+ assertThat(
+ StreamUtils.flatten(ImmutableList.of(
+ Stream.of(1, 2, 3),
+ Stream.of(4, 5)))
+ .collect(Guavate.toImmutableList()))
+ .containsExactly(1, 2, 3, 4, 5);
+ }
+
+ @Test
+ public void flattenShouldAcceptEmptyStreams() {
+ assertThat(
+ StreamUtils.flatten(ImmutableList.of(
+ Stream.of()))
+ .collect(Guavate.toImmutableList()))
+ .isEmpty();
+ }
+
+ @Test
+ public void flattenShouldMergeEmptyStreamsWithOtherData() {
+ assertThat(
+ StreamUtils.flatten(ImmutableList.of(
+ Stream.of(1, 2),
+ Stream.of(),
+ Stream.of(3)))
+ .collect(Guavate.toImmutableList()))
+ .containsExactly(1, 2, 3);
+ }
+
+}
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