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/*
 * Enhydra Java Application Server Project
 * 
 * The contents of this file are subject to the Enhydra Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License on
 * the Enhydra web site ( http://www.enhydra.org/ ).
 * 
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See 
 * the License for the specific terms governing rights and limitations
 * under the License.
 * 
 * The Initial Developer of the Enhydra Application Server is Lutris
 * Technologies, Inc. The Enhydra Application Server and portions created
 * by Lutris Technologies, Inc. are Copyright Lutris Technologies, Inc.
 * All Rights Reserved.
 * 
 * Contributor(s):
 * 
 * $Id: ISO8859CharacterSet.java,v 1.2 2003/06/29 05:58:48 jkjome Exp $
 */
package org.enhydra.xml.io;

/**
 * Information and operations associated with the ISO-8859-* group of character sets.
 */
class ISO8859CharacterSet extends CharacterSet {
    /** Constructor */
    public ISO8859CharacterSet(String name,
                                int charSize,
                                String mimePreferred,
                                String[] aliases) {
        super(name, charSize, mimePreferred, aliases);
    }

    /** 
     * Basic implementation for ISO 8859 character sets. Considers all 
     * characters in the range of 0x0081 through 0x0099 to be invalid. 
     * Note: Acdcording to the specs, these characters are valid. 
     * But they are control characters and rarely ever used on purpose. 
     * In most cases, these characters are encountered by confusing the Windows 
     * CP 1252 character set with ISO-8859-1.
     * @see CharacterSet#isValid
     */
    public boolean isValid(char ch) {
        return super.isValid(ch) && (ch <= 0x80 || ch >= 0xA0);
    }

    /**
     * @see CharacterSet#isCompatible
     */
    public boolean sameValidCharRange(CharacterSet otherSet) {
        // Only valid if otherSet has the same character range and if none of 
        // the control characters in the rang 0x81 through 0x99 are valid in otherSet
        if (!super.isCompatible(otherSet)) { return false; } 
        
        for (char c = 0x81; c < 0xA0; c++) {
            if (otherSet.isValid(c)) return false;
        }
        return true;
    }
}