Java tutorial
/* Copyright (c) 2012-2014, terrestris GmbH & Co. KG * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. Neither the name of the copyright holder nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * (This is the BSD 3-Clause, sometimes called 'BSD New' or 'BSD Simplified', * see http://opensource.org/licenses/BSD-3-Clause) */ package de.terrestris.shogun.serializer; import java.io.IOException; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.JsonSerializer; import com.fasterxml.jackson.databind.SerializerProvider; import de.terrestris.shogun.model.User; /** * A serializer that takes the user object of a model * and returns an id of the corresponding user. * * @author terrestris GmbH & Co. KG * */ public class SimpleUserSerializer extends JsonSerializer<User> { @Override public void serialize(User value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException { jgen.writeNumber(value.getId()); // Also serialize the name of the user into a field "ownerName" // TODO We shouldn't assume that we always are serializing // an "owner" (hence "ownerName" might be not very good decision) // TODO In case we have multiple User.class entities that are serialized // this might lead to an illegal (?) JSON, as duplicate keys might // be produced. I do not know how all parsers deal with this. // "The names within an object SHOULD be unique." // http://www.ietf.org/rfc/rfc4627.txt String ownerName = null; if (value.getUser_firstname() != null) { ownerName = value.getUser_firstname(); } if (value.getUser_lastname() != null) { if (ownerName == null) { ownerName = ""; } else { ownerName += " "; } ownerName += value.getUser_lastname(); } jgen.writeStringField("ownerName", ownerName); } }