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a java development framework with aggregation, repository and process

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package arp.repository;

import java.lang.reflect.Field;

import arp.util.Unsafe;

public class CommonMemRepository extends MemRepository {

	private Class idFieldType;
	private long idFieldOffset;

	public CommonMemRepository(Class cls) {
		try {
			Field idField = cls.getDeclaredField("id");
			idFieldType = idField.getType();
			idFieldOffset = Unsafe.getFieldOffset(idField);
		} catch (Exception e) {
		}
	}

	@Override
	protected Object getId(E entity) {
		try {
			if (byte.class.equals(idFieldType)) {
				return Unsafe.getByteFieldOfObject(entity, idFieldOffset);
			} else if (short.class.equals(idFieldType)) {
				return Unsafe.getShortFieldOfObject(entity, idFieldOffset);
			} else if (char.class.equals(idFieldType)) {
				return Unsafe.getCharFieldOfObject(entity, idFieldOffset);
			} else if (int.class.equals(idFieldType)) {
				return Unsafe.getIntFieldOfObject(entity, idFieldOffset);
			} else if (float.class.equals(idFieldType)) {
				return Unsafe.getFloatFieldOfObject(entity, idFieldOffset);
			} else if (long.class.equals(idFieldType)) {
				return Unsafe.getLongFieldOfObject(entity, idFieldOffset);
			} else if (double.class.equals(idFieldType)) {
				return Unsafe.getDoubleFieldOfObject(entity, idFieldOffset);
			} else if (boolean.class.equals(idFieldType)) {
				return Unsafe.getBooleanFieldOfObject(entity, idFieldOffset);
			} else {
				return Unsafe.getObjectFieldOfObject(entity, idFieldOffset);
			}
		} catch (Exception e) {
			return null;
		}
	}

}