ArrayConverter.java Source code

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Here is the source code for ArrayConverter.java

Source

/**
 * 
 * LibFormula : a free Java formula library
 * 
 *
 * Project Info:  http://reporting.pentaho.org/libformula/
 *
 * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 *
 * ------------
 * $Id: ArrayConverter.java 3521 2007-10-16 10:55:14Z tmorgner $
 * ------------
 * (C) Copyright 2006-2007, by Pentaho Corporation.
 */

import java.util.ArrayList;
import java.util.List;
import java.lang.reflect.Array;

/**
 * Creation-Date: 08.10.2006, 17:37:50
 *
 * @author Thomas Morgner
 */
public class ArrayConverter {
    private ArrayConverter() {
    }

    public static Object[] getAsList(final Object maybeArray, final Class arrayType) {
        if (maybeArray == null) {
            return null;
        }

        if (maybeArray.getClass().isArray() == false) {
            return new Object[] { maybeArray };
        }

        final ArrayList list = new ArrayList();
        ArrayConverter.addToList(list, maybeArray);
        final Object o = Array.newInstance(arrayType, list.size());
        return list.toArray((Object[]) o);
    }

    private static void addToList(final List list, final Object array) {
        final int length = Array.getLength(array);
        for (int i = 0; i < length; i++) {
            final Object value = Array.get(array, i);
            if (value == null) {
                list.add(null);
                continue;
            }

            if (value.getClass().isArray() == false) {
                list.add(value);
                continue;
            }

            ArrayConverter.addToList(list, value);
        }
    }

    /**
     * @param maybeArray
     * @param dimensions
     * @return
     */
    public static Object[] getArray(final Object maybeArray, final Class arrayType, final int dims) {
        if (maybeArray == null) {
            return null;
        }
        if (dims <= 0) {
            return null;
        }

        if (maybeArray.getClass().isArray() == false) {
            Object object = maybeArray;
            for (int i = 0; i < dims; i++) {
                final Object[] array = (Object[]) Array.newInstance(arrayType, 1);
                array[0] = object;
                object = array;
            }
            return (Object[]) object;
        }

        if (ArrayConverter.getDimensionCount(maybeArray.getClass()) < dims) {
            return null;
        }
        return (Object[]) maybeArray;
    }

    public static int getDimensionCount(Class arrayClass) {
        int count = 0;
        while (arrayClass != null && arrayClass.isArray()) {
            count += 1;
            arrayClass = arrayClass.getComponentType();
        }
        return count;
    }

}