Java tutorial
/** * Copyright (C) cedarsoft GmbH. * * Licensed under the GNU General Public License version 3 (the "License") * with Classpath Exception; you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.cedarsoft.org/gpl3ce * (GPL 3 with Classpath Exception) * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 3 only, as * published by the Free Software Foundation. cedarsoft GmbH designates this * particular file as subject to the "Classpath" exception as provided * by cedarsoft GmbH in the LICENSE file that accompanied this code. * * This code 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 General Public License * version 3 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 3 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact cedarsoft GmbH, 72810 Gomaringen, Germany, * or visit www.cedarsoft.com if you need additional information or * have any questions. */ package com.cedarsoft.serialization.jackson.test; import com.cedarsoft.serialization.jackson.AbstractJacksonSerializer; import com.cedarsoft.serialization.jackson.JacksonParserWrapper; import com.cedarsoft.version.Version; import com.cedarsoft.version.VersionException; import com.cedarsoft.version.VersionRange; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.JsonParser; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.core.JsonToken; import javax.annotation.Nonnull; import javax.inject.Inject; import java.io.IOException; import java.util.List; /** * @author Johannes Schneider (<a href="mailto:js@cedarsoft.com">js@cedarsoft.com</a>) */ public class UserSerializer extends AbstractJacksonSerializer<User> { public static final String PROPERTY_NAME = "id"; public static final String PROPERTY_EMAILS = "emails"; public static final String PROPERTY_ROLES = "roles"; public static final String PROPERTY_USER_DETAILS = "userDetails"; public static final String PROPERTY_SINGLE_EMAIL = "singleEmail"; @Inject public UserSerializer(@Nonnull EmailSerializer emailSerializer, @Nonnull RoleSerializer roleSerializer, @Nonnull UserDetailsSerializer userDetailsSerializer) { super("user", VersionRange.from(1, 0, 0).to()); getDelegatesMappings().add(emailSerializer).responsibleFor(Email.class).map(1, 0, 0).toDelegateVersion(1, 0, 0); getDelegatesMappings().add(roleSerializer).responsibleFor(Role.class).map(1, 0, 0).toDelegateVersion(1, 0, 0); getDelegatesMappings().add(userDetailsSerializer).responsibleFor(UserDetails.class).map(1, 0, 0) .toDelegateVersion(1, 0, 0); } @Override public void serialize(@Nonnull JsonGenerator serializeTo, @Nonnull User object, @Nonnull Version formatVersion) throws IOException, VersionException, JsonProcessingException { verifyVersionWritable(formatVersion); serializeTo.writeStringField(PROPERTY_NAME, object.getName()); serializeArray(object.getEmails(), Email.class, PROPERTY_EMAILS, serializeTo, formatVersion); serializeArray(object.getRoles(), Role.class, PROPERTY_ROLES, serializeTo, formatVersion); serialize(object.getUserDetails(), UserDetails.class, PROPERTY_USER_DETAILS, serializeTo, formatVersion); serialize(object.getSingleEmail(), Email.class, PROPERTY_SINGLE_EMAIL, serializeTo, formatVersion); } @Nonnull @Override public User deserialize(@Nonnull JsonParser deserializeFrom, @Nonnull Version formatVersion) throws IOException, VersionException, JsonProcessingException { verifyVersionWritable(formatVersion); List<? extends Email> mails = null; List<? extends Role> roles = null; String name = null; UserDetails userDetails = null; Email singleEmail = null; JacksonParserWrapper parser = new JacksonParserWrapper(deserializeFrom); while (parser.nextToken() == JsonToken.FIELD_NAME) { String currentName = parser.getCurrentName(); if (currentName.equals(PROPERTY_NAME)) { parser.nextToken(JsonToken.VALUE_STRING); name = deserializeFrom.getText(); continue; } if (currentName.equals(PROPERTY_EMAILS)) { parser.nextToken(JsonToken.START_ARRAY); mails = deserializeArray(Email.class, deserializeFrom, formatVersion); continue; } if (currentName.equals(PROPERTY_ROLES)) { parser.nextToken(JsonToken.START_ARRAY); roles = deserializeArray(Role.class, deserializeFrom, formatVersion); continue; } if (currentName.equals(PROPERTY_USER_DETAILS)) { parser.nextToken(JsonToken.START_OBJECT); userDetails = deserialize(UserDetails.class, formatVersion, deserializeFrom); continue; } if (currentName.equals(PROPERTY_SINGLE_EMAIL)) { parser.nextToken(JsonToken.VALUE_STRING); singleEmail = deserialize(Email.class, formatVersion, deserializeFrom); continue; } throw new IllegalStateException("Unexpected field reached <" + currentName + ">"); } //Verify deserialization parser.verifyDeserialized(mails, PROPERTY_EMAILS); parser.verifyDeserialized(roles, PROPERTY_ROLES); parser.verifyDeserialized(userDetails, PROPERTY_USER_DETAILS); parser.verifyDeserialized(singleEmail, PROPERTY_SINGLE_EMAIL); parser.verifyDeserialized(name, PROPERTY_NAME); assert mails != null; assert roles != null; assert name != null; assert userDetails != null; assert singleEmail != null; parser.ensureObjectClosed(); return new User(name, mails, roles, singleEmail, userDetails); } }