org.eclipse.scada.base.json.VariantJsonSerializer.java Source code

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Here is the source code for org.eclipse.scada.base.json.VariantJsonSerializer.java

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/*******************************************************************************
 * Copyright (c) 2013 IBH SYSTEMS GmbH and others.
 * 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:
 *     IBH SYSTEMS GmbH - initial API and implementation
 *******************************************************************************/
package org.eclipse.scada.base.json;

import java.lang.reflect.Type;

import org.eclipse.scada.core.Variant;

import com.google.gson.JsonElement;
import com.google.gson.JsonNull;
import com.google.gson.JsonObject;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

public final class VariantJsonSerializer implements JsonSerializer<Variant> {
    @Override
    public JsonElement serialize(final Variant src, final Type typeOfSrc, final JsonSerializationContext context) {
        if (src == null) {
            return JsonNull.INSTANCE;
        }

        final JsonObject result = new JsonObject();
        result.addProperty(VariantJson.FIELD_TYPE, src.getType().toString());
        switch (src.getType()) {
        case BOOLEAN:
            result.addProperty(VariantJson.FIELD_VALUE, src.asBoolean(null));
            break;
        case DOUBLE: //$FALL-THROUGH$
        case INT32: //$FALL-THROUGH$
        case INT64:
            result.addProperty(VariantJson.FIELD_VALUE, (Number) src.getValue());
            break;
        case STRING:
            result.addProperty(VariantJson.FIELD_VALUE, src.asString(null));
            break;
        case NULL:
            result.add(VariantJson.FIELD_VALUE, JsonNull.INSTANCE);
            break;
        default:
            throw new RuntimeException(String.format("Unknown variant type '%s' encountered", src.getType()));
        }
        return result;
    }
}