| /* |
| * 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.ode.utils; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.Map; |
| |
| /** |
| * Utility class for dealing with arrays. |
| */ |
| public class CollectionUtils { |
| |
| public static final Object[] EMPTY_OBJECT_ARRAY = new Object[]{}; |
| public static final Class[] EMPTY_CLASS_ARRAY = new Class[]{}; |
| |
| /** |
| * Make a {@link Collection} out of an array. |
| * |
| * @param type the type of {@link Collection} to make. |
| * @param elements objects to put into the collection. |
| * @return a {@link Collection} of the type given in the <code>type</type> argument containing <code>elements</code> |
| */ |
| @SuppressWarnings("unchecked") |
| public static <T> Collection<T> makeCollection(Class<? extends Collection> type, T[] elements) { |
| if (elements == null) { |
| return null; |
| } |
| try { |
| Collection<T> c = type.newInstance(); |
| |
| for (int i = 0; i < elements.length; ++i) { |
| c.add(elements[i]); |
| } |
| |
| return c; |
| } catch (Exception ex) { |
| throw new IllegalArgumentException("Invalid arguments.", ex); |
| } |
| } |
| |
| /** |
| * Compares the two specified maps for equality. Returns |
| * <tt>true</tt> if the two maps represent the same mappings. More formally, two maps <tt>m1</tt> and |
| * <tt>m2</tt> represent the same mappings if |
| * <tt>m1.keySet().equals(m2.keySet())</tt> and for every key <tt>k</tt> |
| * in <tt>m1.keySet()</tt>, <tt> (m1.get(k)==null ? m2.get(k)==null : |
| * m1.get(k).equals(m2.get(k))) </tt>. |
| * <p/> |
| * This implementation first checks if the <tt>m1</tt> and <tt>m2</tt> are the same object; |
| * if so it returns <tt>true</tt>. Then, it checks if the two maps have the same sizw; if |
| * not, it returns <tt>false</tt>. If so, it iterates over <tt>m1</tt>'s |
| * <tt>entrySet</tt> collection, and checks that map <tt>m1</tt> |
| * contains each mapping that map <tt>m2</tt> contains. If map <tt>m1</tt> |
| * fails to contain such a mapping, <tt>false</tt> is returned. If the |
| * iteration completes, <tt>true</tt> is returned. |
| * |
| * @return <tt>true</tt> if the specified object is equal to this map. |
| */ |
| public static boolean equals(Map m1, Map m2) { |
| if (m2 == m1) return true; |
| if (m1 == null) return false; |
| if (m2 == null) return false; |
| if (m2.size() != m1.size()) return false; |
| |
| try { |
| for (Iterator it = m1.entrySet().iterator(); it.hasNext();) { |
| Map.Entry e = (Map.Entry) it.next(); |
| Object key = e.getKey(); |
| Object value = e.getValue(); |
| if (value == null) { |
| if (!(m2.get(key) == null && m2.containsKey(key))) |
| return false; |
| } else { |
| if (!value.equals(m2.get(key))) |
| return false; |
| } |
| } |
| } catch (ClassCastException unused) { |
| return false; |
| } catch (NullPointerException unused) { |
| return false; |
| } |
| return true; |
| } |
| |
| } |