/**
 * DataCleaner (community edition)
 * Copyright (C) 2014 Neopost - Customer Information Management
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.datacleaner.beans;

import javax.inject.Named;

import org.datacleaner.api.Categorized;
import org.datacleaner.api.Configured;
import org.datacleaner.api.Description;
import org.datacleaner.api.ExternalDocumentation;
import org.datacleaner.api.ExternalDocumentation.DocumentationLink;
import org.datacleaner.api.ExternalDocumentation.DocumentationType;
import org.datacleaner.api.InputColumn;
import org.datacleaner.api.InputRow;
import org.datacleaner.api.OutputColumns;
import org.datacleaner.api.Transformer;
import org.datacleaner.components.categories.EncodingCategory;

import com.ibm.icu.text.Transliterator;

@Named("Transliterate")
@Description("Converts non-latin characters to latin (or even ASCII) characters.")
@ExternalDocumentation({ @DocumentationLink(title = "Internationalization in DataCleaner",
        url = "https://www.youtube.com/watch?v=ApA-nhtLbhI", type = DocumentationType.VIDEO, version = "3.0") })
@Categorized(EncodingCategory.class)
public class TransliterateTransformer implements Transformer {

    private final Transliterator latinTransliterator = Transliterator.getInstance("Any-Latin");
    private final Transliterator asciiTransformer = Transliterator.getInstance("Latin-ASCII");
    @Configured
    InputColumn<String> column;
    @Configured(required = false)
    @Description("Should latin characters and diacritics be converted to plain ASCII?")
    boolean latinToAscii = true;

    @Override
    public OutputColumns getOutputColumns() {
        return new OutputColumns(String.class, column.getName() + " (transliterated)");
    }

    @Override
    public String[] transform(final InputRow inputRow) {
        String value = inputRow.getValue(column);
        if (value == null) {
            return new String[1];
        }
        value = latinTransliterator.transform(value);
        if (latinToAscii) {
            value = asciiTransformer.transform(value);
        }
        return new String[] { value };
    }

}