com.github.ltsopensource.json.deserializer.CollectionDeserializer Maven / Gradle / Ivy

Go to download
package com.github.ltsopensource.json.deserializer;

import com.github.ltsopensource.json.JSONArray;
import com.github.ltsopensource.json.JSONException;
import com.github.ltsopensource.json.JSONParser;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.*;

/**
 * @author Robert HG ([email protected]) on 12/30/15.
 */
public class CollectionDeserializer implements Deserializer {

    public static final CollectionDeserializer INSTANCE = new CollectionDeserializer();

    @SuppressWarnings({"unchecked", "rawtypes"})
    public  T deserialize(Object object, Type type) {

        if (object instanceof String) {
            object = new JSONArray(object);
        }

        if (!(object instanceof JSONArray || object instanceof Collection)) {
            throw new IllegalArgumentException("object=" + object);
        }

        Class rawClass = getRawClass(type);

        Collection list;
        if (rawClass == AbstractCollection.class) {
            list = new ArrayList();
        } else if (rawClass.isAssignableFrom(HashSet.class)) {
            list = new HashSet();
        } else if (rawClass.isAssignableFrom(LinkedHashSet.class)) {
            list = new LinkedHashSet();
        } else if (rawClass.isAssignableFrom(TreeSet.class)) {
            list = new TreeSet();
        } else if (rawClass.isAssignableFrom(ArrayList.class)) {
            list = new ArrayList();
        } else if (rawClass.isAssignableFrom(EnumSet.class)) {
            Type itemType;
            if (type instanceof ParameterizedType) {
                itemType = ((ParameterizedType) type).getActualTypeArguments()[0];
            } else {
                itemType = Object.class;
            }
            list = EnumSet.noneOf((Class) itemType);
        } else {
            try {
                list = (Collection) rawClass.newInstance();
            } catch (Exception e) {
                throw new JSONException("create instance error, class " + rawClass.getName());
            }
        }

        Type itemType;
        if (type instanceof ParameterizedType) {
            itemType = ((ParameterizedType) type).getActualTypeArguments()[0];
        } else {
            itemType = Object.class;
        }

        Iterable