svn commit: r662589 - /ofbiz/trunk/framework/base/src/base/org/ofbiz/base/util/UtilGenerics.java

[ad...@apache.org]

Author: adrianc
Date: Mon Jun  2 15:20:54 2008
New Revision: 662589

URL: http://svn.apache.org/viewvc?rev=662589&view=rev
Log:
Small enhancement to the UtilGenerics class. Added two helper methods to make it easier to write type-safe code.

Now you can do things like

Map<String, Object> params = UtilGenerics.toMap(context.get("parameters"));

without causing compiler errors or throwing ClassCast exceptions.

Modified:
    ofbiz/trunk/framework/base/src/base/org/ofbiz/base/util/UtilGenerics.java

Modified: ofbiz/trunk/framework/base/src/base/org/ofbiz/base/util/UtilGenerics.java
URL: http://svn.apache.org/viewvc/ofbiz/trunk/framework/base/src/base/org/ofbiz/base/util/UtilGenerics.java?rev=662589&r1=662588&r2=662589&view=diff
==============================================================================
--- ofbiz/trunk/framework/base/src/base/org/ofbiz/base/util/UtilGenerics.java (original)
+++ ofbiz/trunk/framework/base/src/base/org/ofbiz/base/util/UtilGenerics.java Mon Jun  2 15:20:54 2008
@@ -46,6 +46,7 @@
         }
     }
 
+    @SuppressWarnings("unchecked")
     public static <T> Collection<T> checkCollection(Object object) {
         return (Collection<T>) checkCollectionCast(object, Collection.class);
     }
@@ -55,6 +56,7 @@
         return checkCollection(object);
     }
 
+    @SuppressWarnings("unchecked")
     public static <T> List<T> checkList(Object object) {
         return (List<T>) checkCollectionCast(object, List.class);
     }
@@ -64,6 +66,7 @@
         return checkList(object);
     }
 
+    @SuppressWarnings("unchecked")
     public static <K, V> Map<K, V> checkMap(Object object) {
         if (object != null && !(object instanceof Map)) throw new ClassCastException("Not a map");
         return (Map<K, V>) object;
@@ -87,6 +90,7 @@
         return checkMap(object);
     }
 
+    @SuppressWarnings("unchecked")
     public static <T> Set<T> checkSet(Object object) {
         return (Set<T>) checkCollectionCast(object, Set.class);
     }
@@ -96,6 +100,24 @@
         return checkSet(object);
     }
 
+    /** Returns the Object argument as a parameterized List if the Object argument
+     * is an instance of List. Otherwise returns null.
+     */
+    @SuppressWarnings("unchecked")
+    public static <T> List<T> toList(Object object) {
+        if (object != null && !(object instanceof List)) return null;
+        return (List<T>) object;
+    }
+
+    /** Returns the Object argument as a parameterized Map if the Object argument
+     * is an instance of Map. Otherwise returns null.
+     */
+    @SuppressWarnings("unchecked")
+    public static <K, V> Map<K, V> toMap(Object object) {
+        if (object != null && !(object instanceof Map)) return null;
+        return (Map<K, V>) object;
+    }
+
     public static <K, V> Map<K, V> toMap(Class<K> keyType, Class<V> valueType, Object... data) {
         if (data == null) {
             return null;
@@ -116,6 +138,7 @@
         return map;
     }
 
+    @SuppressWarnings("hiding")
     public static <K, Object> Map<K, Object> toMap(Class<K> keyType, Object... data) {
         if (data == null) {
             return null;