com.cedarsoftware.io.factory.EnumClassFactory Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of json-io Show documentation

Java JSON serialization

There is a newer version: 4.30.0

package com.cedarsoftware.io.factory;

import java.util.Optional;

import com.cedarsoftware.io.JsonIoException;
import com.cedarsoftware.io.JsonObject;
import com.cedarsoftware.io.JsonReader;
import com.cedarsoftware.io.MetaUtils;
import com.cedarsoftware.io.Resolver;

/**
 * @author Kenny Partlow ([email protected])
 *         

 *         Copyright (c) Cedar Software LLC
 *         


 *         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
 *         


 *         License
 *         


 *         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.
 */
public class EnumClassFactory implements JsonReader.ClassFactory {
    @Override
    public Object newInstance(Class c, JsonObject jObj, Resolver resolver) {

        String name = getEnumName(jObj);
        Optional> cls = MetaUtils.getClassIfEnum(c);

        if (!cls.isPresent()) {
            throw new JsonIoException("Unable to load enum: " + c + ", class not found or is not an Enum.");
        }

        if (name != null) {
            return jObj.setFinishedTarget(this.fromString(cls.get(), name), false);
        }

        Object value = jObj.getValue();

        if (value instanceof String) {
            return jObj.setFinishedTarget(this.fromString(c, (String) value), true);
        }

        throw new JsonIoException("Unable to instantiate enum: " + c + ", class not found or is not an Enum.");
    }

    @SuppressWarnings({"unchecked", "rawtypes"})
    protected Enum fromString(Class c, String s) {
        return Enum.valueOf((Class) c, s);
    }


    protected String getEnumName(JsonObject jObj) {
        String name = (String) jObj.get("Enum.name");
        return name != null ? name : (String) jObj.get("name");
    }
}