de.schlichtherle.truezip.nio.charset.ZipCharsetProvider Maven / Gradle / Ivy

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The file system driver family for ZIP and related archive file types. Add the JAR artifact of this module to the run time class path to make its file system drivers available for service location in the client API modules.

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/*
 * Copyright (C) 2005-2013 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package de.schlichtherle.truezip.nio.charset;

import java.nio.charset.Charset;
import java.nio.charset.spi.CharsetProvider;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.concurrent.Immutable;

/**
 * A charset provider that only provides the {@code IBM437} character set,
 * also known as {@code CP437}.
 *
 * @author  Christian Schlichtherle
 */
@Immutable
public final class ZipCharsetProvider extends CharsetProvider {

    private static final Map CHARSETS;
    static {
        Logger logger = Logger.getLogger(   ZipCharsetProvider.class.getName(),
                                            ZipCharsetProvider.class.getName());
        Map charsets = new HashMap();
        for (Charset charset : new Charset[] {
            new Ibm437Charset(),
        }) {
            charsets.put(lowerCase(charset.name()), charset);
            for (String alias : charset.aliases())
                charsets.put(lowerCase(alias), charset);
            logger.log(Level.CONFIG, "providing",
                    new Object[] { charset.displayName(), charset.aliases() });
        }
        CHARSETS = Collections.unmodifiableMap(charsets);
    }

    private static String lowerCase(String s) {
        return s.toLowerCase(Locale.ROOT);
    }

    @Override
    public Iterator charsets() {
        return CHARSETS.values().iterator();
    }

    @Override
    public Charset charsetForName(String charset) {
        return CHARSETS.get(lowerCase(charset));
    }
}