[java-support] branch master updated: Add a Function to Predicate adapter.

[Scott Cantor]

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scantor pushed a commit to branch master
in repository java-support.

View the commit online:
http://git.shibboleth.net/view/?p=java-support.git;a=commit;h=b3430003e971799ceae9350814422b5fb3041c90

The following commit(s) were added to refs/heads/master by this push:
       new  b343000   Add a Function to Predicate adapter.
b343000 is described below

commit b3430003e971799ceae9350814422b5fb3041c90
Author: Scott Cantor <cantor.2 at osu.edu>
AuthorDate: Thu Mar 23 15:48:32 2017 -0400

    Add a Function to Predicate adapter.
---
 .../java/support/logic/PredicateSupport.java       | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/src/main/java/net/shibboleth/utilities/java/support/logic/PredicateSupport.java b/src/main/java/net/shibboleth/utilities/java/support/logic/PredicateSupport.java
index 4f6e764..0831f46 100644
--- a/src/main/java/net/shibboleth/utilities/java/support/logic/PredicateSupport.java
+++ b/src/main/java/net/shibboleth/utilities/java/support/logic/PredicateSupport.java
@@ -18,7 +18,9 @@
 package net.shibboleth.utilities.java.support.logic;
 
 import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
 
+import com.google.common.base.Function;
 import com.google.common.base.Predicate;
 
 /**
@@ -65,4 +67,26 @@ public final class PredicateSupport {
     @Nonnull public static Predicate<CharSequence> caseInsensitiveMatch(@Nonnull final String target) {
         return new CaseInsensitiveStringMatchPredicate(target);
     }
+    
+    /**
+     * Creates a predicate that applies a function to an input and returns its result, or a default value
+     * if null.
+     * 
+     * @param <T> type of function input
+     * 
+     * @param function function to apply to input
+     * @param defValue default value if function returns null
+     * 
+     * @return a predicate adapter 
+     */
+    @Nonnull public static <T> Predicate<T> fromFunction(@Nonnull final Function<T,Boolean> function,
+            final boolean defValue) {
+        return new Predicate<T>() {
+            public boolean apply(@Nullable final T input) {
+                final Boolean result = function.apply(input);
+                return result != null ? result : defValue;
+            }
+        };
+    }
+    
 }
\ No newline at end of file

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