svn commit: r733177 - /incubator/openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/util/ArrayUtil.java

[ge...@apache.org]

Author: gerdogdu
Date: Fri Jan  9 14:35:18 2009
New Revision: 733177

URL: http://svn.apache.org/viewvc?rev=733177&view=rev
Log:
Adding array related utility class.

Added:
    incubator/openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/util/ArrayUtil.java   (with props)

Added: incubator/openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/util/ArrayUtil.java
URL: http://svn.apache.org/viewvc/incubator/openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/util/ArrayUtil.java?rev=733177&view=auto
==============================================================================
--- incubator/openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/util/ArrayUtil.java (added)
+++ incubator/openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/util/ArrayUtil.java Fri Jan  9 14:35:18 2009
@@ -0,0 +1,98 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF 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 org.apache.webbeans.util;
+
+public final class ArrayUtil
+{
+    
+    private ArrayUtil()
+    {
+        
+    }
+
+    /**
+     * TODO please review this function and move to some place where all tests
+     * can use it! See also
+     * EJBInterceptComponentTest#testMultipleInterceptedComponent and other test
+     * functions
+     * 
+     * Compare two arrays regardless of the position of the elements in the
+     * arrays. 
+     * The complex handling with temporary flags is necessary due to the
+     * possibility of having multiple occurrences of the same element in the
+     * arrays. In this case both arrays have to contain the exactly same amount
+     * of those elements.
+     * 
+     * This is only suited for smaller arrays (e.g. count < 100) since the
+     * algorithm uses a product of both arrays.
+     * 
+     * If one likes to use this for larger arrays, we'd have to use hashes.
+     * 
+     * @param arr1
+     * @param arr2
+     * @return
+     */
+    public static boolean equalsIgnorePosition(Object[] arr1, Object[] arr2)
+    {
+        if (arr1 == null && arr2 == null)
+        {
+            return true;
+        }
+
+        if (arr1 == null || arr2 == null)
+        {
+            return false;
+        }
+
+        if (arr1.length != arr2.length)
+        {
+            return false;
+        }
+
+        boolean[] found1 = new boolean[arr1.length];
+        boolean[] found2 = new boolean[arr2.length];
+
+        for (int i1 = 0; i1 < arr1.length; i1++)
+        {
+            Object o1 = arr1[i1];
+
+            for (int i2 = 0; i2 < arr2.length; i2++)
+            {
+                Object o2 = arr2[i2];
+
+                // if they are equal and not found already
+                if (o1.equals(o2) && found2[i2] == false)
+                {
+                    // mark the entries in both arrays as found
+                    found1[i1] = true;
+                    found2[i2] = true;
+                    break;
+                }
+            }
+        }
+
+        for (int i = 0; i < found1.length; i++)
+        {
+            if (!found1[i] || !found2[i])
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+    
+}

Propchange: incubator/openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/util/ArrayUtil.java
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