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

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Here is the source code for com.cedarsoft.serialization.jackson.ListSerializer.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.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.Nullable;

import javax.annotation.Nonnull;
import javax.inject.Inject;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * Serializes a collection of primitive types (java.lang.Number or java.lang.String) into a json array
 */
public class ListSerializer extends AbstractJacksonSerializer<List<? extends Object>> {
    @Inject
    public ListSerializer() {
        super("list", VersionRange.single(1, 0, 0));
    }

    @Override
    public void serialize(@Nonnull JsonGenerator serializeTo, @Nonnull List<? extends Object> object,
            @Nonnull Version formatVersion) throws IOException, VersionException, JsonProcessingException {
        serializeTo.writeStartArray();

        for (int i = 0; i < object.size(); i++) {
            Object current = object.get(i);
            serializeElement(serializeTo, current, i);
        }

        serializeTo.writeEndArray();
    }

    protected void serializeElement(@Nonnull JsonGenerator serializeTo, @Nullable Object element, int index)
            throws IOException {
        if (element == null) {
            serializeTo.writeNull();
        } else if (element instanceof Integer) {
            serializeTo.writeNumber((Integer) element);
        } else if (element instanceof Float) {
            serializeTo.writeNumber((Float) element);
        } else if (element instanceof Double) {
            serializeTo.writeNumber((Double) element);
        } else if (element instanceof Long) {
            serializeTo.writeNumber((Long) element);
        } else if (element instanceof Boolean) {
            serializeTo.writeBoolean((Boolean) element);
        } else {
            serializeTo.writeString(String.valueOf(element));
        }
    }

    @Nonnull
    @Override
    public List<? extends Object> deserialize(@Nonnull JsonParser deserializeFrom, @Nonnull Version formatVersion)
            throws IOException, VersionException, JsonProcessingException {
        List<Object> deserialized = new ArrayList<Object>();

        int index = 0;
        while (deserializeFrom.nextToken() != JsonToken.END_ARRAY) {
            deserialized.add(deserializeElement(deserializeFrom, index));
            index++;
        }

        return deserialized;
    }

    @Nullable
    protected Object deserializeElement(@Nonnull JsonParser deserializeFrom, int index) throws IOException {
        //noinspection EnumSwitchStatementWhichMissesCases
        switch (deserializeFrom.getCurrentToken()) {
        case VALUE_STRING:
            return deserializeFrom.getText();
        case VALUE_NUMBER_INT:
            return deserializeFrom.getIntValue();
        case VALUE_NUMBER_FLOAT:
            return deserializeFrom.getDoubleValue();
        case VALUE_TRUE:
            return true;
        case VALUE_FALSE:
            return false;
        case VALUE_NULL:
            return null;
        }

        return deserializeFrom.getText();
    }

    @Override
    public boolean isObjectType() {
        return false;
    }
}