info.freelibrary.marc4j.converter.impl.CodeTable Maven / Gradle / Ivy

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/**
 * Copyright (C) 2002 Bas Peters
 *
 * This file is part of MARC4J
 *
 * MARC4J is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * MARC4J 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 MARC4J; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package info.freelibrary.marc4j.converter.impl;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.URI;
import java.util.HashMap;
import java.util.Vector;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.marc4j.MarcException;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

/**
 * 
 * CodeTable defines a data structure to facilitate
 * AnselToUnicode character conversion.
 * 
 *
 * @author Corey Keith
 */
public class CodeTable implements CodeTableInterface {

    protected static HashMap> charsets =
            null;

    protected static HashMap> combining = null;

    /**
     * Returns true if combining; else, false.
     *
     * @param i
     * @param g0
     * @param g1
     * @return
     */
    @Override
    public boolean isCombining(final int i, final int g0, final int g1) {
        if (i <= 0x7E) {
            final Vector v = combining.get(new Integer(g0));
            return (v != null && v.contains(new Integer(i)));
        } else {
            final Vector v = combining.get(new Integer(g1));
            return (v != null && v.contains(new Integer(i)));
        }
    }

    /**
     * Returns the char for the supplied int and mode.
     *
     * @param c
     * @param mode
     * @return
     */
    @Override
    public char getChar(final int c, final int mode) {
        if (c == 0x20) {
            return (char) c;
        } else {
            final HashMap charset =
                    charsets.get(new Integer(mode));

            if (charset == null) {
                // System.err.println("Hashtable not found: "
                // + Integer.toHexString(mode));
                return (char) c;
            } else {
                Character ch = charset.get(new Integer(c));
                if (ch == null) {
                    final int newc = (c < 0x80) ? c + 0x80 : c - 0x80;
                    ch = charset.get(new Integer(newc));
                    if (ch == null) {
                        // System.err.println("Character not found: "
                        // + Integer.toHexString(c) + " in Code Table: "
                        // + Integer.toHexString(mode));
                        return (char) 0;
                    } else {
                        return ch.charValue();
                    }
                } else {
                    return ch.charValue();
                }
            }
        }
    }

    /**
     * Creates a CodeTable from the supplied {@link InputStream}.
     *
     * @param byteStream
     */
    public CodeTable(final InputStream byteStream) {
        try {
            final SAXParserFactory factory = SAXParserFactory.newInstance();
            factory.setNamespaceAware(true);
            factory.setValidating(false);
            final SAXParser saxParser = factory.newSAXParser();
            final XMLReader rdr = saxParser.getXMLReader();
            final InputSource src = new InputSource(byteStream);
            final CodeTableHandler saxUms = new CodeTableHandler();

            rdr.setContentHandler(saxUms);
            rdr.parse(src);

            charsets = saxUms.getCharSets();
            combining = saxUms.getCombiningChars();
        } catch (final Exception e) {
            throw new MarcException(e.getMessage(), e);
        }
    }

    /**
     * Creates a CodeTable from the supplied file name.
     *
     * @param filename
     */
    public CodeTable(final String filename) {
        try {
            final SAXParserFactory factory = SAXParserFactory.newInstance();
            factory.setNamespaceAware(true);
            factory.setValidating(false);
            final SAXParser saxParser = factory.newSAXParser();
            final XMLReader rdr = saxParser.getXMLReader();
            final File file = new File(filename);
            final InputSource src = new InputSource(new FileInputStream(file));
            final CodeTableHandler saxUms = new CodeTableHandler();

            rdr.setContentHandler(saxUms);
            rdr.parse(src);

            charsets = saxUms.getCharSets();
            combining = saxUms.getCombiningChars();
        } catch (final Exception e) {
            throw new MarcException(e.getMessage(), e);
        }
    }

    /**
     * Creates a CodeTable from the supplied {@link URI}.
     *
     * @param uri
     */
    public CodeTable(final URI uri) {
        try {
            final SAXParserFactory factory = SAXParserFactory.newInstance();
            factory.setNamespaceAware(true);
            factory.setValidating(false);
            final SAXParser saxParser = factory.newSAXParser();
            final XMLReader rdr = saxParser.getXMLReader();
            final InputSource src = new InputSource(uri.toURL().openStream());
            final CodeTableHandler saxUms = new CodeTableHandler();

            rdr.setContentHandler(saxUms);
            rdr.parse(src);

            charsets = saxUms.getCharSets();
            combining = saxUms.getCombiningChars();
        } catch (final Exception e) {
            throw new MarcException(e.getMessage(), e);
        }
    }
}