com.cedarsoft.serialization.jackson.AbstractDelegatingJacksonSerializer.java Source code

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Here is the source code for com.cedarsoft.serialization.jackson.AbstractDelegatingJacksonSerializer.java

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/**
 * 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;

import com.cedarsoft.version.Version;
import com.cedarsoft.version.VersionException;
import com.cedarsoft.version.VersionRange;
import com.cedarsoft.serialization.SerializingStrategy;
import com.cedarsoft.serialization.SerializingStrategySupport;
import com.cedarsoft.serialization.VersionMapping;
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 java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collection;

/**
 * @param <T> the type
 * @author Johannes Schneider (<a href="mailto:js@cedarsoft.com">js@cedarsoft.com</a>)
 */
public abstract class AbstractDelegatingJacksonSerializer<T> extends AbstractJacksonSerializer<T> {
    @Nonnull
    protected final SerializingStrategySupport<T, JsonGenerator, JsonParser, JsonProcessingException, OutputStream, InputStream> serializingStrategySupport;

    protected AbstractDelegatingJacksonSerializer(@Nonnull String nameSpaceUriBase,
            @Nonnull VersionRange formatVersionRange) {
        super(nameSpaceUriBase, formatVersionRange);
        this.serializingStrategySupport = new SerializingStrategySupport<T, JsonGenerator, JsonParser, JsonProcessingException, OutputStream, InputStream>(
                formatVersionRange);
    }

    @Override
    public void serialize(@Nonnull JsonGenerator serializeTo, @Nonnull T object, @Nonnull Version formatVersion)
            throws IOException, VersionException, JsonProcessingException {
        assert isVersionWritable(formatVersion);

        SerializingStrategy<T, JsonGenerator, JsonParser, JsonProcessingException, OutputStream, InputStream> strategy = serializingStrategySupport
                .findStrategy(object);
        Version resolvedVersion = serializingStrategySupport.resolveVersion(strategy, formatVersion);
        serializeTo.writeStringField(PROPERTY_SUB_TYPE, strategy.getId());

        strategy.serialize(serializeTo, object, resolvedVersion);
    }

    @Nonnull
    @Override
    public T deserialize(@Nonnull JsonParser deserializeFrom, @Nonnull Version formatVersion)
            throws IOException, VersionException, JsonProcessingException {
        assert isVersionReadable(formatVersion);

        JacksonParserWrapper parserWrapper = new JacksonParserWrapper(deserializeFrom);
        parserWrapper.nextToken();
        parserWrapper.verifyCurrentToken(JsonToken.FIELD_NAME);
        String currentName = parserWrapper.getCurrentName();

        if (!PROPERTY_SUB_TYPE.equals(currentName)) {
            throw new JsonParseException(
                    "Invalid field. Expected <" + PROPERTY_SUB_TYPE + "> but was <" + currentName + ">",
                    parserWrapper.getCurrentLocation());
        }
        parserWrapper.nextToken();
        String type = deserializeFrom.getText();

        if (type == null) {
            throw new JsonParseException("Attribute" + PROPERTY_SUB_TYPE + " not found. Cannot find strategy.",
                    deserializeFrom.getCurrentLocation());
        }

        SerializingStrategy<? extends T, JsonGenerator, JsonParser, JsonProcessingException, OutputStream, InputStream> strategy = serializingStrategySupport
                .findStrategy(type);
        Version resolvedVersion = serializingStrategySupport.resolveVersion(strategy, formatVersion);
        return strategy.deserialize(deserializeFrom, resolvedVersion);
    }

    @Nonnull
    public Collection<? extends SerializingStrategy<? extends T, JsonGenerator, JsonParser, JsonProcessingException, OutputStream, InputStream>> getStrategies() {
        return serializingStrategySupport.getStrategies();
    }

    @Nonnull
    public VersionMapping addStrategy(
            @Nonnull SerializingStrategy<? extends T, JsonGenerator, JsonParser, JsonProcessingException, OutputStream, InputStream> strategy) {
        return serializingStrategySupport.addStrategy(strategy);
    }

    @Nonnull
    public SerializingStrategySupport<T, JsonGenerator, JsonParser, JsonProcessingException, OutputStream, InputStream> getSerializingStrategySupport() {
        return serializingStrategySupport;
    }
}