jadex.transformation.jsonserializer.processors.JsonEnumProcessor Maven / Gradle / Ivy

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package jadex.transformation.jsonserializer.processors;

import java.lang.reflect.Type;
import java.util.List;

import com.eclipsesource.json.JsonObject;
import com.eclipsesource.json.JsonValue;

import jadex.common.SReflect;
import jadex.common.transformation.IStringConverter;
import jadex.common.transformation.traverser.ITraverseProcessor;
import jadex.common.transformation.traverser.Traverser;
import jadex.common.transformation.traverser.Traverser.MODE;
import jadex.transformation.jsonserializer.JsonTraverser;

public class JsonEnumProcessor extends AbstractJsonProcessor
{
	/**
	 *  Test if the processor is applicable.
	 *  @param object The object.
	 *  @param targetcl	If not null, the traverser should make sure that the result object is compatible with the class loader,
	 *    e.g. by cloning the object using the class loaded from the target class loader.
	 *  @return True, if is applicable. 
	 */
	protected boolean isApplicable(Object object, Type type, ClassLoader targetcl, JsonReadContext context)
	{
		Class clazz = SReflect.getClass(type);
		return (object instanceof JsonObject || object instanceof JsonValue) && clazz!=null && clazz.isEnum();
	}
	
	/**
	 *  Test if the processor is applicable.
	 *  @param object The object.
	 *  @param targetcl	If not null, the traverser should make sure that the result object is compatible with the class loader,
	 *    e.g. by cloning the object using the class loaded from the target class loader.
	 *  @return True, if is applicable. 
	 */
	protected boolean isApplicable(Object object, Type type, ClassLoader targetcl, JsonWriteContext context)
	{
		Class clazz = SReflect.getClass(type);
		return clazz.isEnum();
	}
	
	/**
	 *  Process an object.
	 *  @param object The object.
	 * @param targetcl	If not null, the traverser should make sure that the result object is compatible with the class loader,
	 *    e.g. by cloning the object using the class loaded from the target class loader.
	 *  @return The processed object.
	 */
	protected Object readObject(Object object, Type type, Traverser traverser, List conversionprocessors, List processors, IStringConverter converter, MODE mode, ClassLoader targetcl, JsonReadContext context)
	{
		Enum ret = null;
		
		if(object instanceof JsonObject)
		{
			JsonObject obj = (JsonObject)object;
			Class clazz = SReflect.getClass(type);
			
			String val = obj.getString("value", null);
			
			ret = Enum.valueOf((Class)clazz, val);
			
			JsonValue idx = (JsonValue)obj.get(JsonTraverser.ID_MARKER);
			if(idx!=null)
				((JsonReadContext)context).addKnownObject(ret, idx.asInt());
//			traversed.put(object, ret);
//			((JsonReadContext)context).addKnownObject(ret);
		}
		else if(object instanceof JsonValue)
		{
			String val = ((JsonValue)object).asString();
			Class clazz = SReflect.getClass(type);
			
			ret = Enum.valueOf((Class)clazz, val);
		}
		
		return ret;
	}
	
	/**
	 *  Process an object.
	 *  @param object The object.
	 * @param targetcl	If not null, the traverser should make sure that the result object is compatible with the class loader,
	 *    e.g. by cloning the object using the class loaded from the target class loader.
	 *  @return The processed object.
	 */
	@SuppressWarnings("rawtypes")
	protected Object writeObject(Object object, Type type, Traverser traverser, List conversionprocessors, List processors, IStringConverter converter, MODE mode, ClassLoader targetcl, JsonWriteContext wr)
	{
		wr.addObject(wr.getCurrentInputObject());
		
		wr.write("{");
		wr.writeNameString("value", ((Enum)object).name());
		if(wr.isWriteClass())
			wr.write(",").writeClass(object.getClass());
		if(wr.isWriteId())
			wr.write(",").writeId();

		// Write an extra marker that this is an enum (for javascript side)
		wr.write(",").writeNameValue("enum", true);
		
		wr.write("}");
		return object;
	}
}