EmbedListEncoder.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 com.mongodb.DBObject;
import net.tooan.ynpay.third.mongodb.annotations.Default;
import net.tooan.ynpay.third.mongodb.annotations.EmbedList;
import net.tooan.ynpay.third.mongodb.mapper.DataType;
import net.tooan.ynpay.third.mongodb.mapper.MapperUtil;

import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.util.*;

/**
 * @author Frank Wen(xbwen@hotmail.com)
 */
@SuppressWarnings("unchecked")
public class EmbedListEncoder extends AbstractEncoder {

    public EmbedListEncoder(Object obj, Field field) {
        super(obj, field);
    }

    @Override
    public String getFieldName() {
        String fieldName = field.getName();
        EmbedList embedList = field.getAnnotation(EmbedList.class);
        String name = embedList.name();
        if (!name.equals(Default.NAME)) {
            fieldName = name;
        }
        return fieldName;
    }

    @Override
    public Object encode() {
        Class<?> type = field.getType();
        if (type.isArray()) {
            return encodeArray();
        } else {
            return encodeList(type);
        }
    }

    private Object encodeArray() {
        int len = Array.getLength(value);
        List<DBObject> result = new ArrayList<DBObject>();
        for (int i = 0; i < len; i++) {
            Object o = Array.get(value, i);
            if (o != null) {
                result.add(MapperUtil.toDBObject(o));
            }
        }
        return result;
    }

    private Object encodeList(Class type) {
        if (DataType.isList(type)) {
            List list = (ArrayList) value;
            List<DBObject> result = new ArrayList<DBObject>();
            for (Object o : list) {
                if (o != null) {
                    result.add(MapperUtil.toDBObject(o));
                }
            }
            return result;
        } else if (DataType.isSet(type)) {
            Set set = (Set) value;
            Set<DBObject> result = new HashSet<DBObject>();
            for (Object o : set) {
                if (o != null) {
                    result.add(MapperUtil.toDBObject(o));
                }
            }
            return result;
        } else if (DataType.isMap(type)) {
            Map map = (Map) value;
            Map result = new HashMap();
            for (Object key : map.keySet()) {
                Object o = map.get(key);
                if (o != null) {
                    result.put(key, MapperUtil.toDBObject(o));
                } else {
                    result.put(key, null);
                }
            }
            return result;
        } else {
            return null;
        }
    }

}