001 /**
002 * =========================================
003 * LibFormula : a free Java formula library
004 * =========================================
005 *
006 * Project Info: http://reporting.pentaho.org/libformula/
007 *
008 * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
009 *
010 * This library is free software; you can redistribute it and/or modify it under the terms
011 * of the GNU Lesser General Public License as published by the Free Software Foundation;
012 * either version 2.1 of the License, or (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016 * See the GNU Lesser General Public License for more details.
017 *
018 * You should have received a copy of the GNU Lesser General Public License along with this
019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020 * Boston, MA 02111-1307, USA.
021 *
022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
023 * in the United States and other countries.]
024 *
025 *
026 * ------------
027 * $Id: ArrayConverter.java 3521 2007-10-16 10:55:14Z tmorgner $
028 * ------------
029 * (C) Copyright 2006-2007, by Pentaho Corporation.
030 */
031 package org.jfree.formula.util;
032
033 import java.util.ArrayList;
034 import java.util.List;
035 import java.lang.reflect.Array;
036
037 /**
038 * Creation-Date: 08.10.2006, 17:37:50
039 *
040 * @author Thomas Morgner
041 */
042 public class ArrayConverter
043 {
044 private ArrayConverter()
045 {
046 }
047
048 public static Object[] getAsList(final Object maybeArray,
049 final Class arrayType)
050 {
051 if (maybeArray == null)
052 {
053 return null;
054 }
055
056 if (maybeArray.getClass().isArray() == false)
057 {
058 return new Object[]{maybeArray};
059 }
060
061 final ArrayList list = new ArrayList();
062 ArrayConverter.addToList(list, maybeArray);
063 final Object o = Array.newInstance(arrayType, list.size());
064 return list.toArray((Object[]) o);
065 }
066
067 private static void addToList (final List list, final Object array)
068 {
069 final int length = Array.getLength(array);
070 for (int i = 0; i < length; i++)
071 {
072 final Object value = Array.get(array, i);
073 if (value == null)
074 {
075 list.add(null);
076 continue;
077 }
078
079 if (value.getClass().isArray() == false)
080 {
081 list.add(value);
082 continue;
083 }
084
085 ArrayConverter.addToList(list, value);
086 }
087 }
088
089
090 /**
091 * @param maybeArray
092 * @param dimensions
093 * @return
094 */
095 public static Object[] getArray(final Object maybeArray,
096 final Class arrayType,
097 final int dims)
098 {
099 if (maybeArray == null)
100 {
101 return null;
102 }
103 if (dims <= 0)
104 {
105 return null;
106 }
107
108 if (maybeArray.getClass().isArray() == false)
109 {
110 Object object = maybeArray;
111 for (int i = 0; i < dims; i++)
112 {
113 final Object[] array = (Object[]) Array.newInstance(arrayType, 1);
114 array[0] = object;
115 object = array;
116 }
117 return (Object[]) object;
118 }
119
120 if (ArrayConverter.getDimensionCount(maybeArray.getClass()) < dims)
121 {
122 return null;
123 }
124 return (Object[]) maybeArray;
125 }
126
127 public static int getDimensionCount(Class arrayClass)
128 {
129 int count = 0;
130 while (arrayClass != null && arrayClass.isArray())
131 {
132 count += 1;
133 arrayClass = arrayClass.getComponentType();
134 }
135 return count;
136 }
137
138 }