Multiple user referentials working with IPA.

[lgpl/argeo-commons.git] / org.argeo.util / src / org / argeo / util / LangUtils.java

diff --git a/org.argeo.util/src/org/argeo/util/LangUtils.java b/org.argeo.util/src/org/argeo/util/LangUtils.java
index 36bec240e83601aedd915a342f377b5aef89b1d4..1aee28c03c776d7438cc266e4842dee7e21af671 100644 (file)
--- a/org.argeo.util/src/org/argeo/util/LangUtils.java
+++ b/org.argeo.util/src/org/argeo/util/LangUtils.java
@@ -11,11 +11,12 @@ import java.time.ZonedDateTime;
 import java.time.temporal.ChronoUnit;
 import java.time.temporal.Temporal;
 import java.util.ArrayList;
-import java.util.Collections;
+import java.util.Collection;
 import java.util.Dictionary;
 import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.Hashtable;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
@@ -93,6 +94,20 @@ public class LangUtils {
                return res;
        }
 
+       /** Converts a {@link Dictionary} to a {@link Map}. */
+       public static Map<String, Object> dictToMap(Dictionary<String, ?> properties) {
+               if (properties == null) {
+                       return null;
+               }
+               Map<String, Object> res = new HashMap<>(properties.size());
+               Enumeration<String> keys = properties.keys();
+               while (keys.hasMoreElements()) {
+                       String key = keys.nextElement();
+                       res.put(key, properties.get(key));
+               }
+               return res;
+       }
+
        /**
         * Get a string property from this map, expecting to find it, or
         * <code>null</code> if not found.
@@ -236,6 +251,34 @@ public class LangUtils {
                return values;
        }
 
+       /** Size of an {@link Iterable}, optimised if it is a {@link Collection}. */
+       public static int size(Iterable<?> iterable) {
+               if (iterable instanceof Collection)
+                       return ((Collection<?>) iterable).size();
+
+               int size = 0;
+               for (Iterator<?> it = iterable.iterator(); it.hasNext(); size++)
+                       it.next();
+               return size;
+       }
+
+       public static <T> T getAt(Iterable<T> iterable, int index) {
+               if (iterable instanceof List) {
+                       List<T> lst = ((List<T>) iterable);
+                       if (index >= lst.size())
+                               throw new IllegalArgumentException("Index " + index + " is not available (size is " + lst.size() + ")");
+                       return lst.get(index);
+               }
+               int i = 0;
+               for (Iterator<T> it = iterable.iterator(); it.hasNext(); i++) {
+                       if (i == index)
+                               return it.next();
+                       else
+                               it.next();
+               }
+               throw new IllegalArgumentException("Index " + index + " is not available (size is " + i + ")");
+       }
+
        /*
         * EXCEPTIONS
         */