arp.repository.copy.EntityCopier Maven / Gradle / Ivy

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a java development framework with aggregation, repository and process
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package arp.repository.copy;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import arp.util.Unsafe;

public class EntityCopier {

	private static Map typeFieldCopiers = new ConcurrentHashMap<>();

	public static  T copy(T entity) {
		if (entity == null) {
			return null;
		}

		if (Enum.class.equals(entity.getClass().getSuperclass())) {
			return entity;
		}

		T copyOfEntity = Unsafe.allocateInstance(entity.getClass());
		String clsName = entity.getClass().getName();
		FieldCopier[] fieldCopiers = typeFieldCopiers.get(clsName);
		if (fieldCopiers == null) {
			fieldCopiers = buildFieldCopiers(entity.getClass());
			typeFieldCopiers.putIfAbsent(clsName, fieldCopiers);
		}
		for (FieldCopier fieldCopier : fieldCopiers) {
			fieldCopier.copyField(entity, copyOfEntity);
		}
		return copyOfEntity;
	}

	private static FieldCopier[] buildFieldCopiers(Class cls) {
		Field[] fields = cls.getDeclaredFields();
		FieldCopier[] copiers = new FieldCopier[fields.length];
		for (int i = 0; i < fields.length; i++) {
			Field field = fields[i];
			Class fieldType = field.getType();
			if (byte.class.equals(fieldType)) {
				copiers[i] = new ByteFieldCopier(field);
			} else if (short.class.equals(fieldType)) {
				copiers[i] = new ShortFieldCopier(field);
			} else if (char.class.equals(fieldType)) {
				copiers[i] = new CharFieldCopier(field);
			} else if (int.class.equals(fieldType)) {
				copiers[i] = new IntFieldCopier(field);
			} else if (long.class.equals(fieldType)) {
				copiers[i] = new LongFieldCopier(field);
			} else if (float.class.equals(fieldType)) {
				copiers[i] = new FloatFieldCopier(field);
			} else if (double.class.equals(fieldType)) {
				copiers[i] = new DoubleFieldCopier(field);
			} else if (boolean.class.equals(fieldType)) {
				copiers[i] = new BooleanFieldCopier(field);
			} else if (Object.class.equals(fieldType)) {
				copiers[i] = new ValueObjectFieldCopier(field);
			} else if (Byte.class.equals(fieldType)) {
				copiers[i] = new ValueObjectFieldCopier(field);
			} else if (Short.class.equals(fieldType)) {
				copiers[i] = new ValueObjectFieldCopier(field);
			} else if (Character.class.equals(fieldType)) {
				copiers[i] = new ValueObjectFieldCopier(field);
			} else if (Integer.class.equals(fieldType)) {
				copiers[i] = new ValueObjectFieldCopier(field);
			} else if (Long.class.equals(fieldType)) {
				copiers[i] = new ValueObjectFieldCopier(field);
			} else if (Float.class.equals(fieldType)) {
				copiers[i] = new ValueObjectFieldCopier(field);
			} else if (Double.class.equals(fieldType)) {
				copiers[i] = new ValueObjectFieldCopier(field);
			} else if (Boolean.class.equals(fieldType)) {
				copiers[i] = new ValueObjectFieldCopier(field);
			} else if (String.class.equals(fieldType)) {
				copiers[i] = new ValueObjectFieldCopier(field);
			} else if (Enum.class.equals(fieldType.getSuperclass())) {
				copiers[i] = new ValueObjectFieldCopier(field);
			} else if (byte[].class.equals(fieldType)) {
				copiers[i] = new ByteArrayFieldCopier(field);
			} else if (short[].class.equals(fieldType)) {
				copiers[i] = new ShortArrayFieldCopier(field);
			} else if (char[].class.equals(fieldType)) {
				copiers[i] = new CharArrayFieldCopier(field);
			} else if (int[].class.equals(fieldType)) {
				copiers[i] = new IntArrayFieldCopier(field);
			} else if (long[].class.equals(fieldType)) {
				copiers[i] = new LongArrayFieldCopier(field);
			} else if (float[].class.equals(fieldType)) {
				copiers[i] = new FloatArrayFieldCopier(field);
			} else if (double[].class.equals(fieldType)) {
				copiers[i] = new DoubleArrayFieldCopier(field);
			} else if (boolean[].class.equals(fieldType)) {
				copiers[i] = new BooleanArrayFieldCopier(field);
			} else if (fieldType.getName().startsWith("[L")) {
				copiers[i] = new ValueObjectArrayFieldCopier(field);
			} else if (ArrayList.class.equals(fieldType)) {
				copiers[i] = new ArrayListFieldCopier(field);
			} else if (LinkedList.class.equals(fieldType)) {
				copiers[i] = new LinkedListFieldCopier(field);
			} else if (List.class.equals(fieldType)) {
				copiers[i] = new ListFieldCopier(field);
			} else if (Queue.class.equals(fieldType)) {
				copiers[i] = new QueueFieldCopier(field);
			} else if (HashSet.class.equals(fieldType)) {
				copiers[i] = new HashSetFieldCopier(field);
			} else if (Set.class.equals(fieldType)) {
				copiers[i] = new SetFieldCopier(field);
			} else if (HashMap.class.equals(fieldType)) {
				copiers[i] = new HashMapFieldCopier(field);
			} else if (Map.class.equals(fieldType)) {
				copiers[i] = new MapFieldCopier(field);
			} else {
				copiers[i] = new EntityFieldCopier(field);
			}
		}
		return copiers;
	}

}