[java-support] branch main updated: Add an Iterator wrapper allowing reflective iteration on Java 17.

[Scott Cantor]

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

View the commit online:
http://git.shibboleth.net/view/?p=java-support.git;a=commit;h=181ab99a354115bf01743df8c5a903446cc9196d

The following commit(s) were added to refs/heads/main by this push:
     new 181ab99  Add an Iterator wrapper allowing reflective iteration on Java 17.
181ab99 is described below

commit 181ab99a354115bf01743df8c5a903446cc9196d
Author: Scott Cantor <cantor.2 at osu.edu>
AuthorDate: Tue Feb 1 13:52:01 2022 -0500

    Add an Iterator wrapper allowing reflective iteration on Java 17.
---
 .../support/collection/ReflectionSafeIterator.java | 62 ++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/src/main/java/net/shibboleth/utilities/java/support/collection/ReflectionSafeIterator.java b/src/main/java/net/shibboleth/utilities/java/support/collection/ReflectionSafeIterator.java
new file mode 100644
index 0000000..28dd168
--- /dev/null
+++ b/src/main/java/net/shibboleth/utilities/java/support/collection/ReflectionSafeIterator.java
@@ -0,0 +1,62 @@
+/*
+ * 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.Iterator;
+
+import javax.annotation.Nonnull;
+
+import net.shibboleth.utilities.java.support.logic.Constraint;
+
+/**
+ *  Wrapper class for delegating publically to {@link Iterator} implementations that
+ *  may themselves be private.
+ *  
+ *  <p>This addresses bugs in Java that result from old implementations of collection classes
+ *  that were never cleaned up to work properly in Java 17+ after access to JDK internals was
+ *  clossed off.</p>
+ *  
+ *  @param <T> iterator type
+ *  
+ *  @since 8.2.0
+ */
+public class ReflectionSafeIterator<T> implements Iterator<T> {
+
+    /** Wrapped iterator. */
+    @Nonnull private final Iterator<T> iter;
+    
+    /**
+     * Constructor.
+     *
+     * @param i iterator to wrap
+     */
+    public ReflectionSafeIterator(@Nonnull final Iterator<T> i) {
+        iter = Constraint.isNotNull(i, "Wrapped Iterator cannot be null");
+    }
+    
+    /** {@inheritDoc} */
+    public boolean hasNext() {
+        return iter.hasNext();
+    }
+
+    /** {@inheritDoc} */
+    public T next() {
+        return iter.next();
+    }
+
+}
\ No newline at end of file

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