1 files changed, 88 insertions, 0 deletions
diff --git a/src/org/apache/http/util/LangUtils.java b/src/org/apache/http/util/LangUtils.java
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+++ b/src/org/apache/http/util/LangUtils.java
@@ -0,0 +1,88 @@
+/*
+ * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/util/LangUtils.java $
+ * $Revision: 503413 $
+ * $Date: 2007-02-04 06:22:14 -0800 (Sun, 04 Feb 2007) $
+ *
+ * ====================================================================
+ * 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+package org.apache.http.util;
+
+/**
+ * A set of utility methods to help produce consistent
+ * {@link Object#equals equals} and {@link Object#hashCode hashCode} methods.
+ *  
+ * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
+ * 
+ * @since 4.0
+ */
+public final class LangUtils {
+    
+    public static final int HASH_SEED = 17;
+    public static final int HASH_OFFSET = 37;
+
+    /** Disabled default constructor. */
+    private LangUtils() {
+    }
+
+    public static int hashCode(final int seed, final int hashcode) {
+        return seed * HASH_OFFSET + hashcode;
+    }
+
+    public static int hashCode(final int seed, final boolean b) {
+        return hashCode(seed, b ? 1 : 0);
+    }
+    
+    public static int hashCode(final int seed, final Object obj) {
+        return hashCode(seed, obj != null ? obj.hashCode() : 0);
+    }
+    
+    public static boolean equals(final Object obj1, final Object obj2) {
+        return obj1 == null ? obj2 == null : obj1.equals(obj2);
+    }
+
+    public static boolean equals(final Object[] a1, final Object[] a2) {
+        if (a1 == null) {
+            if (a2 == null) {
+                return true;
+            } else {
+                return false;
+            }
+        } else {
+            if (a2 != null && a1.length == a2.length) {
+                for (int i = 0; i < a1.length; i++) {
+                    if (!equals(a1[i], a2[i])) {
+                        return false;
+                    }
+                }
+                return true;
+            } else {
+                return false;
+            }
+        }
+    }
+    
+}