/*

 * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package build.tools.cldrconverter;

import java.io.File;

import java.io.IOException;

import org.xml.sax.Attributes;

import org.xml.sax.InputSource;

import org.xml.sax.SAXException;

/**

 * Handles parsing of files in Locale Data Markup Language for numberingSystems.xml

 * and produces a map that uses the keys and values of JRE locale data.

 */

class NumberingSystemsParseHandler extends AbstractLDMLHandler<String> {

    NumberingSystemsParseHandler() {

    }

    @Override

    public InputSource resolveEntity(String publicID, String systemID) throws IOException, SAXException {

        // avoid HTTP traffic to unicode.org

        if (systemID.startsWith(CLDRConverter.SPPL_LDML_DTD_SYSTEM_ID)) {

            return new InputSource((new File(CLDRConverter.LOCAL_SPPL_LDML_DTD)).toURI().toString());

        }

        return null;

    }

    @Override

    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {

        switch (qName) {

        case "numberingSystem":

            numberingSystem: {

                if ("numeric".equals(attributes.getValue("type"))) {

                    // eg, <numberingSystem id="latn" type="numeric" digits="0123456789"/>

                    String script = attributes.getValue("id");

                    String digits = attributes.getValue("digits");

                    if (Character.isSurrogate(digits.charAt(0))) {

                        // DecimalFormatSymbols doesn't support supplementary characters as digit zero.

                        // Replace supplementary digits with latin digits. This is a restriction till JDK-8204092 is resolved.

                        digits = "0123456789";

                        put(script, digits);

                        break numberingSystem;

                    }

                    // in case digits are in the reversed order, reverse back the order.

                    if (digits.charAt(0) > digits.charAt(digits.length() - 1)) {

                        StringBuilder sb = new StringBuilder(digits);

                        digits = sb.reverse().toString();

                    }

                    // Check if the order is sequential.

                    char c0 = digits.charAt(0);

                    for (int i = 1; i < digits.length(); i++) {

                        if (digits.charAt(i) != c0 + i) {

                            break numberingSystem;

                        }

                    }

                    // script/digits are acceptable.

                    put(script, digits);

                }

            }

            pushIgnoredContainer(qName);

            break;

        case "version":

        case "generation":

            pushIgnoredContainer(qName);

            break;

        default:

            // treat anything else as a container

            pushContainer(qName, attributes);

            break;

        }

    }

    @Override

    public void endElement(String uri, String localName, String qName) throws SAXException {

        assert qName.equals(currentContainer.getqName()) : "current=" + currentContainer.getqName() + ", param=" + qName;

        currentContainer = currentContainer.getParent();

    }

}