[Jakarta-Velocity Wiki] Updated: PublicFieldUberspect

[ve...@jakarta.apache.org]

   Date: 2004-11-06T04:38:51
   Editor: ShinobuKawai <sh...@ieee.org>
   Wiki: Jakarta-Velocity Wiki
   Page: PublicFieldUberspect
   URL: http://wiki.apache.org/jakarta-velocity/PublicFieldUberspect

   Added array #clone() #length support.

Change Log:

------------------------------------------------------------------------------
@@ -21,6 +21,7 @@
 
 import org.apache.velocity.util.introspection.Info;
 import org.apache.velocity.util.introspection.UberspectImpl;
+import org.apache.velocity.util.introspection.VelMethod;
 import org.apache.velocity.util.introspection.VelPropertyGet;
 import org.apache.velocity.util.introspection.VelPropertySet;
 
@@ -49,6 +50,22 @@
     }
 
     /**
+     *  Method
+     */
+    public VelMethod getMethod(Object obj, String methodName, Object[] args, Info i)
+            throws Exception
+    {
+        Class clazz = obj.getClass();
+        boolean isArray = clazz.isArray();
+        boolean isClone = methodName.equals("clone") && (args.length == 0);
+        if (isArray && isClone) {
+            return new ArrayCloneMethod(clazz);
+        }
+
+        return super.getMethod(obj, methodName, args, i);
+    }
+
+    /**
      * Property getter - returns VelPropertyGet appropos for #set($foo = $bar.woogie).
      * <br />
      * First tries the regular routine.  If a getter was not found,
@@ -63,6 +80,13 @@
     public VelPropertyGet getPropertyGet(Object obj, String identifier, Info i)
             throws Exception
     {
+        Class clazz = obj.getClass();
+        boolean isArray = clazz.isArray();
+        boolean isLength = identifier.equals("length");
+        if (isArray && isLength) {
+            return new ArrayLengthGetter();
+        }
+
         VelPropertyGet getter = super.getPropertyGet(obj, identifier, i);
         // there is no clean way to see if super succeeded
         // @see http://issues.apache.org/bugzilla/show_bug.cgi?id=31742
@@ -169,6 +193,52 @@
         }
     }
 
+    protected class ArrayLengthGetter implements VelPropertyGet
+    {
+        public ArrayLengthGetter()
+        {
+        }
+
+        public Object invoke(Object o) throws Exception
+        {
+            if (o instanceof boolean[]) {
+                return new Integer(((boolean[]) o).length);
+            }
+            if (o instanceof byte[]) {
+                return new Integer(((byte[]) o).length);
+            }
+            if (o instanceof short[]) {
+                return new Integer(((short[]) o).length);
+            }
+            if (o instanceof int[]) {
+                return new Integer(((int[]) o).length);
+            }
+            if (o instanceof long[]) {
+                return new Integer(((long[]) o).length);
+            }
+            if (o instanceof float[]) {
+                return new Integer(((float[]) o).length);
+            }
+            if (o instanceof double[]) {
+                return new Integer(((double[]) o).length);
+            }
+            if (o instanceof Object[]) {
+                return new Integer(((Object[]) o).length);
+            }
+            return null;
+        }
+
+        public boolean isCacheable()
+        {
+            return true;
+        }
+
+        public String getMethodName()
+        {
+            return "array length getter";
+        }
+    }
+
     /**
      * Implemetetion of {@link VelPropertySet} that sets to public fields.
      *
@@ -222,6 +292,61 @@
         public String getMethodName()
         {
             return "public field setter";
+        }
+    }
+
+    public class ArrayCloneMethod implements VelMethod
+    {
+        private Class clazz = null;
+
+        public ArrayCloneMethod(Class clazz)
+        {
+            this.clazz = clazz;
+        }
+
+        public Object invoke(Object o, Object[] params)
+            throws Exception
+        {
+            if (o instanceof boolean[]) {
+                return ((boolean[]) o).clone();
+            }
+            if (o instanceof byte[]) {
+                return ((byte[]) o).clone();
+            }
+            if (o instanceof short[]) {
+                return ((short[]) o).clone();
+            }
+            if (o instanceof int[]) {
+                return ((int[]) o).clone();
+            }
+            if (o instanceof long[]) {
+                return ((long[]) o).clone();
+            }
+            if (o instanceof float[]) {
+                return ((float[]) o).clone();
+            }
+            if (o instanceof double[]) {
+                return ((double[]) o).clone();
+            }
+            if (o instanceof Object[]) {
+                return ((Object[]) o).clone();
+            }
+            return null;
+        }
+
+        public boolean isCacheable()
+        {
+            return true;
+        }
+
+        public String getMethodName()
+        {
+            return "clone";
+        }
+
+        public Class getReturnType()
+        {
+            return this.clazz;
         }
     }
 

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