org.nomin.util.ArrayHelper Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of nomin Show documentation

Nomin is a mapping engine for the Java platform. It provides abilities to transform object trees according to declarative mapping rules. Main features of Nomin are no XML configuration, intuitively looking mapping, using arbitrary expressions and method invocations in mappings, pre and postprocessing right in a mapping listing, customizations. It's applicable for any Java compatible classes, not only JavaBeans.

There is a newer version: 1.2.2

Show newest version

package org.nomin.util;

import java.util.*;
import org.nomin.core.preprocessing.Preprocessing;
import static org.nomin.core.preprocessing.Preprocessing.preprocess;

/**
 * Assists to manipulate with arrays.
 * @author Dmitry Dobrynin
 *         Date: 25.10.2010 Time: 21:54:18
*/
public class ArrayHelper extends ContainerHelper {
    public ArrayHelper(TypeInfo typeInfo) {
        super(typeInfo.getParameter(0).type, typeInfo.getParameter(0));
    }

    public Object[] createContainer(int size) throws Exception {
        return (Object[]) java.lang.reflect.Array.newInstance(containerClass, size);
    }

    public Object[] convert(Collection source, Preprocessing[] preprocessings) throws Exception {
        Object[] target = createContainer(source.size());
        int index = 0;
        for (Object object : source) target[index++] = preprocess(object, preprocessings, 0);
        return target;
    }

    public Object setElement(Object target, Object index, Object element, Preprocessing[] preprocessing) throws Exception {
        Integer i = (Integer) index;
        Object[] targetArray = (Object[]) target;
        if (targetArray != null && (i < 0 || i >= targetArray.length))
            targetArray = Arrays.copyOf(targetArray, i < 0 ? targetArray.length + 1 : i + 1);
        else
            targetArray = createContainer(i < 0 ? 1 : i + 1);
        targetArray[i < 0 ? targetArray.length - 1 : i] = preprocess(element, preprocessing, 0);
        return targetArray;
    }

    public Object getElement(Object source, Object index) {
        Object[] array = (Object[]) source;
        return array.length > (Integer) index ? array[(Integer) index] : null;
    }
}