gov.nasa.pds.harvest.dd.DDNJsonWriter Maven / Gradle / Ivy

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package gov.nasa.pds.harvest.dd;

import java.io.File;
import com.google.gson.stream.JsonWriter;

import gov.nasa.pds.harvest.util.json.BaseNJsonWriter;


/**
 * NJSON (new-line delimited JSON) writer for data dictionary records.
 * 
 * @author karpenko
 *
 */
public class DDNJsonWriter extends BaseNJsonWriter
{
    /**
     * Constructor
     * @param file output file
     * @throws Exception an exception
     */
    public DDNJsonWriter(File file, boolean overwrite) throws Exception
    {
        super(file, overwrite ? "index" : "create");
    }

    
    /**
     * Write one data record.
     */
    @Override
    public void writeDataRecord(JsonWriter jw, DDRecord data) throws Exception
    {
        String fieldName = (data.esFieldName != null) ? data.esFieldName : data.esFieldNameFromComponents();
        writeField(jw, "es_field_name", fieldName);
        
        writeField(jw, "es_data_type", data.esDataType);

        writeField(jw, "class_ns", data.classNs);
        writeField(jw, "class_name", data.className);
        
        writeField(jw, "attr_ns", data.attrNs);
        writeField(jw, "attr_name", data.attrName);
        
        writeField(jw, "data_type", data.dataType);
        writeField(jw, "description", data.description);

        writeField(jw, "im_version", data.imVersion);
        writeField(jw, "ldd_version", data.lddVersion);
        writeField(jw, "date", data.date);
    }


    private void writeField(JsonWriter jw, String name, String value) throws Exception
    {
        if(value == null) return;
        jw.name(name).value(value);
    }
}