110 lines
3.5 KiB
Java
110 lines
3.5 KiB
Java
/*
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* Copyright 2008 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.zxing.common;
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import java.util.Hashtable;
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/**
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* Encapsulates a Character Set ECI, according to "Extended Channel Interpretations" 5.3.1.1
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* of ISO 18004.
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*
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* @author Sean Owen
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*/
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public final class CharacterSetECI extends ECI {
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private static Hashtable VALUE_TO_ECI;
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private static Hashtable NAME_TO_ECI;
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private static void initialize() {
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VALUE_TO_ECI = new Hashtable(29);
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NAME_TO_ECI = new Hashtable(29);
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// TODO figure out if these values are even right!
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addCharacterSet(0, "Cp437");
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addCharacterSet(1, new String[] {"ISO8859_1", "ISO-8859-1"});
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addCharacterSet(2, "Cp437");
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addCharacterSet(3, new String[] {"ISO8859_1", "ISO-8859-1"});
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addCharacterSet(4, "ISO8859_2");
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addCharacterSet(5, "ISO8859_3");
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addCharacterSet(6, "ISO8859_4");
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addCharacterSet(7, "ISO8859_5");
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addCharacterSet(8, "ISO8859_6");
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addCharacterSet(9, "ISO8859_7");
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addCharacterSet(10, "ISO8859_8");
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addCharacterSet(11, "ISO8859_9");
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addCharacterSet(12, "ISO8859_10");
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addCharacterSet(13, "ISO8859_11");
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addCharacterSet(15, "ISO8859_13");
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addCharacterSet(16, "ISO8859_14");
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addCharacterSet(17, "ISO8859_15");
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addCharacterSet(18, "ISO8859_16");
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addCharacterSet(20, new String[] {"SJIS", "Shift_JIS"});
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}
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private final String encodingName;
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private CharacterSetECI(int value, String encodingName) {
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super(value);
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this.encodingName = encodingName;
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}
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public String getEncodingName() {
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return encodingName;
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}
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private static void addCharacterSet(int value, String encodingName) {
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CharacterSetECI eci = new CharacterSetECI(value, encodingName);
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VALUE_TO_ECI.put(new Integer(value), eci); // can't use valueOf
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NAME_TO_ECI.put(encodingName, eci);
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}
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private static void addCharacterSet(int value, String[] encodingNames) {
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CharacterSetECI eci = new CharacterSetECI(value, encodingNames[0]);
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VALUE_TO_ECI.put(new Integer(value), eci); // can't use valueOf
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for (int i = 0; i < encodingNames.length; i++) {
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NAME_TO_ECI.put(encodingNames[i], eci);
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}
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}
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/**
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* @param value character set ECI value
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* @return CharacterSetECI representing ECI of given value, or null if it is legal but
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* unsupported
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* @throws IllegalArgumentException if ECI value is invalid
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*/
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public static CharacterSetECI getCharacterSetECIByValue(int value) {
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if (VALUE_TO_ECI == null) {
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initialize();
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}
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if (value < 0 || value >= 900) {
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throw new IllegalArgumentException("Bad ECI value: " + value);
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}
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return (CharacterSetECI) VALUE_TO_ECI.get(new Integer(value));
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}
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/**
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* @param name character set ECI encoding name
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* @return CharacterSetECI representing ECI for character encoding, or null if it is legal
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* but unsupported
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*/
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public static CharacterSetECI getCharacterSetECIByName(String name) {
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if (NAME_TO_ECI == null) {
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initialize();
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}
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return (CharacterSetECI) NAME_TO_ECI.get(name);
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}
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} |