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EMF JSON Jackson

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/*
 * Copyright (c) 2015 Guillaume Hillairet.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Guillaume Hillairet - initial API and implementation
 *
 */
package org.emfjson.jackson.databind.ser;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import org.eclipse.emf.common.util.EMap;

import java.io.IOException;
import java.util.Map;

public class EMapSerializer extends JsonSerializer {

	@Override
	public void serialize(EMap value, JsonGenerator jg, SerializerProvider serializers) throws IOException {
		if (value.keySet().isEmpty()) {
			jg.writeNull();
			return;
		}

		final Map.Entry firstEntry = (Map.Entry) value.get(0);

		if (firstEntry.getKey() instanceof String) {
			jg.writeStartObject();
			for (Object entry: value) {
				jg.writeObject(entry);
			}
			jg.writeEndObject();
		} else {
			jg.writeStartArray();
			for (Object entry: value) {
				jg.writeObject(entry);
			}
			jg.writeEndArray();
		}
	}

	@Override
	public Class handledType() {
		return EMap.class;
	}

}