| /******************************************************************************* |
| * Copyright (c) 2013 RCP Vision (http://www.rcp-vision.com) and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Lorenzo Bettini - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.emf.parsley.util; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.eclipse.emf.ecore.EObject; |
| |
| import com.google.common.collect.Lists; |
| |
| /** |
| * Some utility static methods. |
| * |
| * @author Lorenzo Bettini - Initial Contribution and API |
| * |
| */ |
| public class EmfParsleyUtil { |
| |
| protected EmfParsleyUtil() { |
| |
| } |
| |
| /** |
| * Given the passed object it ensures that it is a {@link Collection}; if it |
| * is not, it returns a singleton {@link Collection}; if it is null it |
| * returns an empty {@link Collection}. |
| * |
| * @param contents |
| * @return |
| */ |
| public static Collection<Object> ensureCollection(Object contents) { |
| if (contents == null) { |
| return Collections.emptyList(); |
| } |
| return ensureCollectionInternal(contents); |
| } |
| |
| @SuppressWarnings("unchecked") |
| private static Collection<Object> ensureCollectionInternal(Object contents) { |
| if (contents instanceof Collection<?>) { |
| return (Collection<Object>) contents; |
| } else if (contents instanceof Iterable<?>) { |
| return Lists.newArrayList((Iterable<?>) contents); |
| } else if (contents instanceof Iterator<?>) { |
| return Lists.newArrayList((Iterator<?>) contents); |
| } else if (contents.getClass().isArray()) { |
| return Arrays.asList((Object[]) contents); |
| } |
| return Collections.singleton(contents); |
| } |
| |
| /** |
| * Given a List of Integer it returns an array of int |
| * |
| * @param intList |
| * @return |
| */ |
| public static int[] toIntArray(List<Integer> intList) { |
| int[] result = new int[intList.size()]; |
| int i = 0; |
| for (Integer e : intList) { |
| result[i++] = e; |
| } |
| return result; |
| } |
| |
| /** |
| * If the passed object is not an EObject simply returns null. |
| * |
| * @param o |
| * @return |
| */ |
| public static EObject getEObjectOrNull(Object o) { |
| if (o instanceof EObject) { |
| return (EObject) o; |
| } |
| return null; |
| } |
| |
| /** |
| * @since 1.1 |
| */ |
| @SuppressWarnings({ "rawtypes", "unchecked" }) |
| public static int compareValues(Object value1, Object value2) { |
| if (comparables(value1, value2)) { |
| return ((Comparable) value1).compareTo(value2); |
| } else if (value1 != null && value2 != null) { |
| return value1.toString().compareTo(value2.toString()); |
| } else if (value1 != null) { |
| return 1; |
| } else if (value2 != null) { |
| return -1; |
| } |
| return 0; |
| } |
| |
| private static boolean comparables(Object value1, Object value2) { |
| return value1 instanceof Comparable && value2 instanceof Comparable; |
| } |
| } |