org.openmrs.module.odkconnector.serialization.serializer.ListSerializer.java Source code

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Here is the source code for org.openmrs.module.odkconnector.serialization.serializer.ListSerializer.java

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/**
 * The contents of this file are subject to the OpenMRS Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://license.openmrs.org
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * Copyright (C) OpenMRS, LLC.  All Rights Reserved.
 */

package org.openmrs.module.odkconnector.serialization.serializer;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.lang.ClassUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.openmrs.annotation.Handler;
import org.openmrs.module.odkconnector.serialization.Serializer;
import org.openmrs.util.HandlerUtil;

@Handler(supports = List.class, order = 50)
public class ListSerializer implements Serializer {

    private static final Log log = LogFactory.getLog(ListSerializer.class);

    /**
     * Write the data to the output stream.
     *
     * @param stream the output stream
     * @param data   the data that need to be written to the output stream
     * @throws java.io.IOException thrown when the writing process encounter is failing
     */
    @Override
    public void write(final OutputStream stream, final Object data) throws IOException {

        DataOutputStream outputStream = new DataOutputStream(stream);

        List list = null;
        if (ClassUtils.isAssignable(data.getClass(), List.class))
            list = (List) data;

        if (list == null || CollectionUtils.isEmpty(list))
            outputStream.writeInt(Serializer.ZERO);
        else {
            outputStream.writeInt(list.size());
            for (Object object : list) {
                Serializer serializer = HandlerUtil.getPreferredHandler(Serializer.class, object.getClass());
                serializer.write(outputStream, object);
            }
            outputStream.flush();
        }
    }
}