PackedGSMCharset.java

package com.cloudhopper.commons.charset;

/*
 * #%L
 * ch-commons-charset
 * %%
 * Copyright (C) 2012 Cloudhopper by Twitter
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

/**
 * The <b>PackedGSMCharset</b> class handles the encoding and decoding of the
 * GSM default encoding charset, with packing as per GSM 03.38 spec.
 *
 * The encoding and decoding are based on the mapping at
 * http://www.unicode.org/Public/MAPPINGS/ETSI/GSM0338.TXT
 * 
 * @author joelauer (twitter: @jjlauer or <a href="http://twitter.com/jjlauer" target=window>http://twitter.com/jjlauer</a>)
 */
public class PackedGSMCharset extends GSMCharset {

    @Override
    public byte[] encode(CharSequence str0) {
        // delete to parent first
        byte[] unpacked = super.encode(str0);
        // return a "packed" version of it
        return GSMBitPacker.pack(unpacked);
    }

    @Override
    public void decode(byte[] bytes, StringBuilder buffer) {
        // unpack the byte array first
        byte[] unpacked = GSMBitPacker.unpack(bytes);
        // delegate to parent
        super.decode(unpacked, buffer);
    }

}