/* * This file is part of the GeoLatte project. * * GeoLatte is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * GeoLatte is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with GeoLatte. If not, see <http://www.gnu.org/licenses/>. * * Copyright (C) 2010 - 2010 and Ownership of code is shared by: * Qmino bvba - Romeinsestraat 18 - 3001 Heverlee (http://www.qmino.com) * Geovise bvba - Generaal Eisenhowerlei 9 - 2140 Antwerpen (http://www.geovise.com) */ package org.geolatte.common.dataformats.json.jackson; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.databind.JsonMappingException; import com.fasterxml.jackson.databind.JsonSerializer; import com.fasterxml.jackson.databind.SerializerProvider; import com.fasterxml.jackson.databind.ser.BeanSerializer; import org.geolatte.common.Feature; import org.geolatte.common.reflection.EntityClassReader; import org.geolatte.common.reflection.InvalidObjectReaderException; import org.geolatte.geom.Geometry; import java.io.IOException; import java.util.HashMap; /** * Generic serializer for a feature. This serializer will serialize all properties of the feature and serialize them * seperately according to the serializers present in the system. If for some reason, a part can not be serialized * it is skipped from the feature (ie: the serializer will attempt to deliver a json representation of a part of the * feature if it can) * <p> * <i>Creation-Date</i>: 20-apr-2010<br> * <i>Creation-Time</i>: 9:17:47<br> * </p> * * @author Yves Vandewoude * @author <a href="http://www.qmino.com">Qmino bvba</a> * @since SDK1.5 */ public class FeatureSerializer extends JsonSerializer<Feature> { JsonMapper parent; public FeatureSerializer(JsonMapper jsonTransformation) { parent = jsonTransformation; } /** * Method that can be called to ask implementation to serialize values of type this serializer handles. * * @param value Value to serialize; can not be null. * @param jgen Generator used to output resulting Json content * @param provider Provider that can be used to get serializers for serializing Objects value contains, if any. * @throws java.io.IOException If serialization failed. */ public void serialize(Feature value, JsonGenerator jgen, SerializerProvider provider) throws IOException { jgen.writeStartObject(); jgen.writeStringField("type", "Feature"); if (value != null) { Geometry geom = value.getGeometry(); if (geom == null) { jgen.writeNullField("geometry"); } else { // set beanproperty to null since we are not serializing a real property JsonSerializer ser = provider.findValueSerializer(geom.getClass(), null); if (ser != null && ser instanceof GeometrySerializer) { parent.increaseDepth(); jgen.writeFieldName("geometry"); ser.serialize(geom, jgen, provider); parent.decreaseDepth(); } } Object id = value.getId(); if (id != null) { // Shouldn't happen, but what can you do? jgen.writeObjectField("id", id); } jgen.writeFieldName("properties"); jgen.writeStartObject(); for (String propertyName : value.getProperties()) { Object propertyContents = value.getProperty(propertyName); if (propertyContents != null) { try { // set beanproperty to null since we are not serializing a real property JsonSerializer<Object> ser = provider.findValueSerializer(propertyContents.getClass(), null); if (ser != null) { // Beanserializers have the nasty habit to crash if they don't know how to proceed, leaving // the resulting json in inconsistent state from which it's hard to recover inside a // serialization. We therefore reroute it through the transformer: if it crashes, we just // keep the empty serialization for that specific object instead of invalidating the entire // surrounding json. In addition, they crash with circular references... if (ser instanceof BeanSerializer) { String subPart = parent.recurse( EntityClassReader.getClassReaderFor(propertyContents.getClass()).asFeature(propertyContents)); try { HashMap subPartMap = parent.getObjectMapper().readValue(subPart, HashMap.class); jgen.writeFieldName(propertyName); jgen.writeObject(subPartMap); } catch (IOException ignored) { } } else { jgen.writeFieldName(propertyName); ser.serialize(propertyContents, jgen, provider); } } } catch (JsonMappingException exc) { jgen.writeStartObject(); jgen.writeEndObject(); } catch (InvalidObjectReaderException e) { // Will not happen! } } } jgen.writeEndObject(); } jgen.writeEndObject(); } }