[java-support] branch master updated: IDP-1647 Add helper method to deduplicate UnmodifiableMaps during construction

[Rod Widdowson]

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View the commit online:
http://git.shibboleth.net/view/?p=java-support.git;a=commit;h=64c8f923610ee001fc1564b8b62ba18b62f42d6e

The following commit(s) were added to refs/heads/master by this push:
       new  64c8f92   IDP-1647 Add helper method to deduplicate UnmodifiableMaps during construction
64c8f92 is described below

commit 64c8f923610ee001fc1564b8b62ba18b62f42d6e
Author: Rod Widdowson <rdw at steadingsoftware.com>
AuthorDate: Sun Jul 26 15:42:17 2020 +0100

    IDP-1647 Add helper method to deduplicate UnmodifiableMaps during construction
    
    https://issues.shibboleth.net/jira/browse/IDP-1647
---
 .../java/support/collection/CollectionSupport.java | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/src/main/java/net/shibboleth/utilities/java/support/collection/CollectionSupport.java b/src/main/java/net/shibboleth/utilities/java/support/collection/CollectionSupport.java
new file mode 100644
index 0000000..13db57d
--- /dev/null
+++ b/src/main/java/net/shibboleth/utilities/java/support/collection/CollectionSupport.java
@@ -0,0 +1,58 @@
+/*
+ * Licensed to the University Corporation for Advanced Internet Development,
+ * Inc. (UCAID) under one or more contributor license agreements.  See the
+ * NOTICE file distributed with this work for additional information regarding
+ * copyright ownership. The UCAID 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 net.shibboleth.utilities.java.support.collection;
+
+import java.util.function.BinaryOperator;
+import java.util.stream.Collectors;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Support functions for Collection and Map Management.
+ */
+public final class CollectionSupport {
+    
+    /** logger. */
+    private static Logger log = LoggerFactory.getLogger(CollectionSupport.class);
+    
+    /** Constructor. */
+    private CollectionSupport() {
+    }
+
+    /** Build something we can plug in into {@link 
+     * Collectors#toMap(java.util.function.Function, java.util.function.Function, BinaryOperator)}.
+     * @param <T> the type we'll be looking at
+     * @param what What we are building (i.e. IdpUI) 
+     * @param takeFirst do we want the first of the last to win.
+     * @return an appropriate {@link BinaryOperator}
+     */
+    public static <T> BinaryOperator<T> warningMergeFunction(final String what, final boolean takeFirst) {
+        
+        return new BinaryOperator<>() {
+
+            public T apply(final T current, final T lookingAt) {
+                log.warn("Duplicate detected building {}", what);
+                log.debug("Values provided are {} and {} taking {}", current, lookingAt,
+                        takeFirst ?"first":"last");
+                return takeFirst? current:lookingAt ;
+            }
+            
+        };        
+    }
+}

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