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.serializers.jackson; import com.cedarsoft.serialization.jackson.JacksonParserWrapper; import com.cedarsoft.version.Version; import com.cedarsoft.version.VersionException; import com.cedarsoft.version.VersionRange; import com.cedarsoft.crypt.Algorithm; import com.cedarsoft.crypt.Hash; import com.cedarsoft.serialization.jackson.AbstractJacksonSerializer; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.JsonParseException; 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; public class HashSerializer extends AbstractJacksonSerializer<Hash> { public static final String PROPERTY_ALGORITHM = "algorithm"; public static final String PROPERTY_VALUE = "hex"; @Inject public HashSerializer() { super("hash", VersionRange.from(1, 0, 0).to(1, 0, 0)); } @Override public void serialize(@Nonnull JsonGenerator serializeTo, @Nonnull Hash object, @Nonnull Version formatVersion) throws IOException, JsonProcessingException { verifyVersionReadable(formatVersion); serializeTo.writeStringField(PROPERTY_ALGORITHM, object.getAlgorithm().name()); serializeTo.writeStringField(PROPERTY_VALUE, object.getValueAsHex()); } @Nonnull @Override public Hash deserialize(@Nonnull JsonParser deserializeFrom, @Nonnull Version formatVersion) throws VersionException, IOException, JsonProcessingException { JacksonParserWrapper parserWrapper = new JacksonParserWrapper(deserializeFrom); parserWrapper.nextToken(); parserWrapper.verifyCurrentToken(JsonToken.FIELD_NAME); String currentName1 = parserWrapper.getCurrentName(); if (!PROPERTY_ALGORITHM.equals(currentName1)) { throw new JsonParseException( "Invalid field. Expected <" + PROPERTY_ALGORITHM + "> but was <" + currentName1 + ">", parserWrapper.getCurrentLocation()); } parserWrapper.nextToken(); Algorithm algorithm = Algorithm.getAlgorithm(deserializeFrom.getText()); parserWrapper.nextToken(); parserWrapper.verifyCurrentToken(JsonToken.FIELD_NAME); String currentName = parserWrapper.getCurrentName(); if (!PROPERTY_VALUE.equals(currentName)) { throw new JsonParseException( "Invalid field. Expected <" + PROPERTY_VALUE + "> but was <" + currentName + ">", parserWrapper.getCurrentLocation()); } parserWrapper.nextToken(); String hex = deserializeFrom.getText(); parserWrapper.nextToken(JsonToken.END_OBJECT); return Hash.fromHex(algorithm, hex); } }