X-Git-Url: https://git.argeo.org/?a=blobdiff_plain;f=org.argeo.cms%2Fsrc%2Forg%2Fargeo%2Fcms%2Futil%2FDictionaryKeys.java;fp=org.argeo.cms%2Fsrc%2Forg%2Fargeo%2Fcms%2Futil%2FDictionaryKeys.java;h=a9f6a318feddb1fe1626381f46ff063ad3b967ad;hb=54df376a9c2dd458a82eaa09bfbb718fe699dd0d;hp=0000000000000000000000000000000000000000;hpb=3c1cdc594d954520b14646102b366290bdad58c7;p=lgpl%2Fargeo-commons.git

diff --git a/org.argeo.cms/src/org/argeo/cms/util/DictionaryKeys.java b/org.argeo.cms/src/org/argeo/cms/util/DictionaryKeys.java
new file mode 100644
index 000000000..a9f6a318f
--- /dev/null
+++ b/org.argeo.cms/src/org/argeo/cms/util/DictionaryKeys.java
@@ -0,0 +1,42 @@
+package org.argeo.cms.util;
+
+import java.util.Dictionary;
+import java.util.Enumeration;
+import java.util.Iterator;
+
+/**
+ * Access the keys of a {@link String}-keyed {@link Dictionary} (common throughout
+ * the OSGi APIs) as an {@link Iterable} so that they are easily usable in
+ * for-each loops.
+ */
+class DictionaryKeys implements Iterable<String> {
+	private final Dictionary<String, ?> dictionary;
+
+	public DictionaryKeys(Dictionary<String, ?> dictionary) {
+		this.dictionary = dictionary;
+	}
+
+	@Override
+	public Iterator<String> iterator() {
+		return new KeyIterator(dictionary.keys());
+	}
+
+	private static class KeyIterator implements Iterator<String> {
+		private final Enumeration<String> keys;
+
+		KeyIterator(Enumeration<String> keys) {
+			this.keys = keys;
+		}
+
+		@Override
+		public boolean hasNext() {
+			return keys.hasMoreElements();
+		}
+
+		@Override
+		public String next() {
+			return keys.nextElement();
+		}
+
+	}
+}