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From lburgazz...@apache.org
Subject camel git commit: Add some functional bits
Date Mon, 04 Sep 2017 15:12:05 GMT
Repository: camel
Updated Branches:
  refs/heads/master 5db786a28 -> 70c18da39


Add some functional bits


Project: http://git-wip-us.apache.org/repos/asf/camel/repo
Commit: http://git-wip-us.apache.org/repos/asf/camel/commit/70c18da3
Tree: http://git-wip-us.apache.org/repos/asf/camel/tree/70c18da3
Diff: http://git-wip-us.apache.org/repos/asf/camel/diff/70c18da3

Branch: refs/heads/master
Commit: 70c18da3980e4d39b12bd7c62d6f9cfb3f2dd867
Parents: 5db786a
Author: lburgazzoli <lburgazzoli@gmail.com>
Authored: Mon Sep 4 17:11:35 2017 +0200
Committer: lburgazzoli <lburgazzoli@gmail.com>
Committed: Mon Sep 4 17:11:43 2017 +0200

----------------------------------------------------------------------
 .../apache/camel/util/function/Predicates.java  | 55 ++++++++++++++++++++
 .../camel/util/function/PredicatesTest.java     | 32 ++++++++++++
 2 files changed, 87 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/camel/blob/70c18da3/camel-core/src/main/java/org/apache/camel/util/function/Predicates.java
----------------------------------------------------------------------
diff --git a/camel-core/src/main/java/org/apache/camel/util/function/Predicates.java b/camel-core/src/main/java/org/apache/camel/util/function/Predicates.java
new file mode 100644
index 0000000..d8c8780
--- /dev/null
+++ b/camel-core/src/main/java/org/apache/camel/util/function/Predicates.java
@@ -0,0 +1,55 @@
+/**
+ * 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.camel.util.function;
+
+import java.util.function.Predicate;
+
+import org.apache.camel.util.ObjectHelper;
+
+/**
+ * Predicate helpers, inspired by http://minborgsjavapot.blogspot.it/2016/03/put-your-java-8-method-references-to.html
+ *
+ */
+public final class Predicates {
+    private Predicates() {
+    }
+
+    /**
+     * Wrap a predicate, useful for method references.
+     */
+    public static <T> Predicate<T> of(Predicate<T> predicate) {
+        ObjectHelper.notNull(predicate, "Predicate");
+
+        return predicate;
+    }
+
+
+    /**
+     * Negates a predicate, useful for method references.
+     * 
+     * <pre>
+     *     Stream.of("A", "", "B")
+     *         .filter(Predicates.negate(String::isEmpty))
+     *         .count();
+     * </pre>
+     */
+    public static <T> Predicate<T> negate(Predicate<T> predicate) {
+        ObjectHelper.notNull(predicate, "Predicate");
+
+        return predicate.negate();
+    }
+}

http://git-wip-us.apache.org/repos/asf/camel/blob/70c18da3/camel-core/src/test/java/org/apache/camel/util/function/PredicatesTest.java
----------------------------------------------------------------------
diff --git a/camel-core/src/test/java/org/apache/camel/util/function/PredicatesTest.java b/camel-core/src/test/java/org/apache/camel/util/function/PredicatesTest.java
new file mode 100644
index 0000000..559d223
--- /dev/null
+++ b/camel-core/src/test/java/org/apache/camel/util/function/PredicatesTest.java
@@ -0,0 +1,32 @@
+/**
+ * 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.camel.util.function;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class PredicatesTest {
+
+    @Test
+    public void testNegate() {
+        Assert.assertFalse(Predicates.of(String::isEmpty).test("something"));
+        Assert.assertTrue(Predicates.of(String::isEmpty).negate().test("something"));
+        Assert.assertTrue(Predicates.negate(String::isEmpty).test("something"));
+        Assert.assertFalse(Predicates.negate(String::isEmpty).test(""));
+        Assert.assertFalse(Predicates.of(String::isEmpty).negate().test(""));
+    }
+}


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