help methods for manipulating arrays

tools/cooja/java/se/sics/cooja/util/ArrayUtils.java

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+/*
+ * Copyright (c) 2009, Swedish Institute of Computer Science. All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. 3. Neither the name of the
+ * Institute nor the names of its contributors may be used to endorse or promote
+ * products derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $Id: ArrayUtils.java,v 1.1 2009/07/02 11:58:37 fros4943 Exp $
+ */
+
+package se.sics.cooja.util;
+
+/**
+ * Some utility methods for managing arrays.
+ *
+ * @author Niclas Finne, Fredrik Osterlind
+ */
+public class ArrayUtils {
+
+  @SuppressWarnings("unchecked")
+  public static <T> T[] add(T[] array, T value) {
+    T[] tmp = (T[]) java.lang.reflect.Array.newInstance(
+        ((Class<? extends T>)array.getClass()).getComponentType(),
+        array.length + 1);
+    System.arraycopy(array, 0, tmp, 0, array.length);
+    tmp[array.length] = value;
+    return tmp;
+  }
+
+  @SuppressWarnings("unchecked")
+  public static <T> T[] remove(T[] array, int index) {
+    if ((index < 0) || (index >= array.length)) {
+      throw new ArrayIndexOutOfBoundsException(index);
+    }
+
+    T[] tmp = (T[]) java.lang.reflect.Array.newInstance(
+        ((Class<? extends T>)array.getClass()).getComponentType(),
+        array.length - 1);
+    if (index > 0) {
+      System.arraycopy(array, 0, tmp, 0, index);
+    }
+    if (index < tmp.length) {
+      System.arraycopy(array, index + 1, tmp, index, tmp.length - index);
+    }
+    return tmp;
+  }
+
+  public static <T> T[] remove(T[] array, T element) {
+    int index = indexOf(array, element);
+    return (index >= 0) ? remove(array, index) : array;
+  }
+
+  public static <T> int indexOf(T[] array, T element) {
+    if (array != null) {
+      if (element == null) {
+        for (int i = 0, n = array.length; i < n; i++) {
+          if (array[i] == null) {
+            return i;
+          }
+        }
+      } else {
+        for (int i = 0, n = array.length; i < n; i++) {
+          if (element.equals(array[i])) {
+            return i;
+          }
+        }
+      }
+    }
+    return -1;
+  }
+}