001    /*
002     *  Copyright 2001-2010 Stephen Colebourne
003     *
004     *  Licensed under the Apache License, Version 2.0 (the "License");
005     *  you may not use this file except in compliance with the License.
006     *  You may obtain a copy of the License at
007     *
008     *      http://www.apache.org/licenses/LICENSE-2.0
009     *
010     *  Unless required by applicable law or agreed to in writing, software
011     *  distributed under the License is distributed on an "AS IS" BASIS,
012     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     *  See the License for the specific language governing permissions and
014     *  limitations under the License.
015     */
016    package org.joda.primitives;
017    
018    import java.util.Collection;
019    import java.util.Iterator;
020    
021    import org.joda.primitives.collection.IntCollection;
022    
023    /**
024     * Provides utility methods and constants for <code>int</code>.
025     * 
026     * @author Stephen Colebourne
027     * @author Jason Tiscione
028     * @version CODE GENERATED
029     * @since 1.0
030     */
031    public class IntUtils {
032        // This file is CODE GENERATED. Do not change manually.
033        
034        /**
035         * Immutable empty array.
036         */
037        public static final int[] EMPTY_INT_ARRAY = new int[0];
038        
039        /**
040         * Constructor that should not usually be used.
041         */
042        public IntUtils() {
043            super();
044        }
045    
046        /**
047         * Wraps an <code>int</code> with an Object wrapper.
048         * 
049         * @param value  the primitive value
050         * @return the Object wrapper
051         */
052        public static Integer toObject(int value) {
053            return new Integer(value);
054        }
055    
056        /**
057         * Unwraps the <code>Integer</code> to retrieve the primitive <code>int</code>.
058         * 
059         * @param value  the Object wrapper, must not be null
060         * @return the primitive value
061         * @throws NullPointerException if the value if null
062         * @throws ClassCastException if the object is not <code>Integer</code>
063         */
064        public static int toPrimitive(Object value) {
065            return ((Integer) value).intValue();
066        }
067    
068        /**
069         * Unwraps a <code>Collection</code> to retrieve the primitive <code>int</code>.
070         * 
071         * @param coll  the Collection of Integer, must not be null
072         * @return the primitive value array
073         * @throws NullPointerException if the collection if null
074         * @throws ClassCastException if any object is not <code>Integer</code>
075         */
076        public static int[] toPrimitiveArray(Collection <?> coll) {
077            if (coll instanceof IntCollection) {
078                return ((IntCollection) coll).toIntArray();
079            }
080            int[] result = new int[coll.size()];
081            int i = 0;
082            for (Iterator<?> it = coll.iterator(); it.hasNext(); i++) {
083                Integer value = (Integer) it.next();
084                result[i] = value.intValue();
085            }
086            return result;
087        }
088    
089    }