001/**
002 * Copyright 2011-2015 John Ericksen
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *    http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.parceler.converter;
017
018import android.os.Parcel;
019import org.parceler.TypeRangeParcelConverter;
020
021import java.util.Map;
022
023/**
024 *
025 * @author u61173
026 */
027public abstract class MapParcelConverter<K, V, M extends Map<K, V>> implements TypeRangeParcelConverter<Map<K, V>, M> {
028
029    private static final int NULL = -1;
030    
031    @Override
032    public void toParcel(Map<K, V> input, Parcel parcel) {
033        if (input == null) {
034            parcel.writeInt(NULL);
035        } else {
036            parcel.writeInt(input.size());
037            for (Map.Entry<K, V> entry : input.entrySet()) {
038                mapKeyToParcel(entry.getKey(), parcel);
039                mapValueToParcel(entry.getValue(), parcel);
040            }
041        }
042    }
043
044    @Override
045    public M fromParcel(Parcel parcel) {
046        M map;
047        int size = parcel.readInt();
048        if (size == NULL) {
049            map = null;
050        } else {
051            map = createMap();
052            for (int i = 0; (i < size); i++) {
053                K key = mapKeyFromParcel(parcel);
054                V value = mapValueFromParcel(parcel);
055                map.put(key, value);
056            }
057        }
058        return map;
059    }
060
061    public abstract M createMap();
062
063    public abstract void mapKeyToParcel(K key, Parcel parcel);
064    public abstract void mapValueToParcel(V value, Parcel parcel);
065
066    public abstract K mapKeyFromParcel(Parcel parcel);
067    public abstract V mapValueFromParcel(Parcel parcel);
068}