IdEncoder.java

/*
 * Copyright (c) www.bugull.com
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.tooan.ynpay.third.mongodb.encoder;

import net.tooan.ynpay.third.jfinal.log.Logger;
import net.tooan.ynpay.third.mongodb.annotations.Id;
import net.tooan.ynpay.third.mongodb.cache.DaoCache;
import net.tooan.ynpay.third.mongodb.exception.IdException;
import net.tooan.ynpay.third.mongodb.mapper.InternalDao;
import net.tooan.ynpay.third.mongodb.mapper.Operator;
import org.bson.types.ObjectId;

import java.lang.reflect.Field;

/**
 * @author Frank Wen(xbwen@hotmail.com)
 */
public class IdEncoder extends AbstractEncoder {

    private final static Logger logger = Logger.getLogger(IdEncoder.class);

    private Id id;

    public IdEncoder(Object obj, Field field) {
        super(obj, field);
        id = field.getAnnotation(Id.class);
    }

    @Override
    public boolean isNullField() {
        return false;
    }

    @Override
    public String getFieldName() {
        return Operator.ID;
    }

    @Override
    public Object encode() {
        Object result = null;
        try {
            result = fixIdValue();
        } catch (IdException ex) {
            logger.error(ex.getMessage(), ex);
        }
        return result;
    }

    private Object fixIdValue() throws IdException {
        Object result = null;
        switch (id.type()) {
            case AUTO_GENERATE:
                if (value == null) {
                    result = new ObjectId();
                } else {
                    result = new ObjectId(value.toString());
                }
                break;
            case AUTO_INCREASE:
                if (value == null) {
                    InternalDao dao = DaoCache.getInstance().get(obj.getClass());
                    long max = dao.getMaxId();
                    if (max == 0) {
                        result = id.start();
                    } else {
                        result = max + 1L;
                    }
                } else {
                    result = Long.parseLong(value.toString());
                }
                break;
            case USER_DEFINE:
                if (value == null) {
                    throw new IdException("User define id haven't given a value!");
                } else {
                    result = value.toString();
                }
                break;
        }
        return result;
    }

}