/**
 * This file is part of pinyin4j (http://sourceforge.net/projects/pinyin4j/) 
 * and distributed under GNU GENERAL PUBLIC LICENSE (GPL).
 * 
 * pinyin4j is free software; you can redistribute it and/or modify 
 * it under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 2 of the License, or 
 * (at your option) any later version. 
 * 
 * pinyin4j 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 for more details. 
 * 
 * You should have received a copy of the GNU General Public License 
 * along with pinyin4j.
 */

package net.sourceforge.pinyin4j;

import java.io.FileNotFoundException;
import java.io.IOException;

import com.hp.hpl.sparta.Document;
import com.hp.hpl.sparta.ParseException;
import com.hp.hpl.sparta.Parser;

/**
 * Contains the resource supporting translations among different Chinese
 * Romanization systems
 * 
 * @author Li Min (xmlerlimin@gmail.com)
 * 
 */
class PinyinRomanizationResource
{
    /**
     * A DOM model contains variable pinyin presentations
     */
    private Document pinyinMappingDoc;

    /**
     * @param pinyinMappingDoc
     *            The pinyinMappingDoc to set.
     */
    private void setPinyinMappingDoc(Document pinyinMappingDoc)
    {
        this.pinyinMappingDoc = pinyinMappingDoc;
    }

    /**
     * @return Returns the pinyinMappingDoc.
     */
    Document getPinyinMappingDoc()
    {
        return pinyinMappingDoc;
    }

    /**
     * Private constructor as part of the singleton pattern.
     */
    private PinyinRomanizationResource()
    {
        initializeResource();
    }

    /**
     * Initialiez a DOM contains variable PinYin representations
     */
    private void initializeResource()
    {
        try
        {
            final String mappingFileName = "/pinyindb/pinyin_mapping.xml";
            final String systemId = "";

            // Parse file to DOM Document
            setPinyinMappingDoc(Parser.parse(systemId, ResourceHelper.getResourceInputStream(mappingFileName)));

        } catch (FileNotFoundException ex)
        {
            ex.printStackTrace();
        } catch (IOException ex)
        {
            ex.printStackTrace();
        } catch (ParseException e)
        {
            e.printStackTrace();
        }
    }

    /**
     * Singleton factory method.
     * 
     * @return the one and only MySingleton.
     */
    static PinyinRomanizationResource getInstance()
    {
        return PinyinRomanizationSystemResourceHolder.theInstance;
    }

    /**
     * Singleton implementation helper.
     */
    private static class PinyinRomanizationSystemResourceHolder
    {
        static final PinyinRomanizationResource theInstance = new PinyinRomanizationResource();
    }
}