/*
 * Copyright (c) 2005, 2020, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.org.apache.xalan.internal.xsltc.trax;

import java.util.ArrayList;
import java.util.List;
import javax.xml.stream.Location;
import javax.xml.stream.XMLReporter;
import javax.xml.stream.XMLStreamException;
import org.xml.sax.Attributes;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.ext.LexicalHandler;
import org.xml.sax.ext.Locator2;
import org.xml.sax.helpers.DefaultHandler;

public abstract class SAX2StAXBaseWriter extends DefaultHandler
        implements
        LexicalHandler {

    protected boolean isCDATA;

    protected StringBuffer CDATABuffer;

    protected List<String> namespaces;

    protected Locator docLocator;

    protected XMLReporter reporter;

    String xmlVersion = null, encoding = null;

    public SAX2StAXBaseWriter() {
    }

    public SAX2StAXBaseWriter(XMLReporter reporter) {
        this.reporter = reporter;
    }

    public void setXMLReporter(XMLReporter reporter) {
        this.reporter = reporter;
    }

    public void setDocumentLocator(Locator locator) {
        this.docLocator = locator;
    }

    private void updateVersionAndEncoding() {
        if (docLocator != null && docLocator instanceof Locator2) {
            Locator2 l2 = (Locator2) docLocator;
            xmlVersion = l2.getXMLVersion();
            encoding = l2.getEncoding();
        }
    }

    public void setXmlVersion(String version) {
        this.xmlVersion = version;
    }

    public void setEncoding(String encoding) {
        this.encoding = encoding;
    }

    void writeStartDocument() throws SAXException {
        updateVersionAndEncoding();
    }

    public Location getCurrentLocation() {
        if (docLocator != null) {
            return new SAXLocation(docLocator);
        } else {
            return null;
        }
    }

    public void error(SAXParseException e) throws SAXException {
        reportException("ERROR", e);
    }

    public void fatalError(SAXParseException e) throws SAXException {
        reportException("FATAL", e);
    }

    public void warning(SAXParseException e) throws SAXException {
        reportException("WARNING", e);
    }

    public void startDocument() throws SAXException {
        namespaces = new ArrayList<>(2);
    }

    public void endDocument() throws SAXException {
        namespaces = null;
    }

    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
        namespaces = null;
    }

    public void endElement(String uri, String localName, String qName)
            throws SAXException {
        namespaces = null;
    }

    public void startPrefixMapping(String prefix, String uri)
            throws SAXException {

        if (prefix == null) {
            prefix = "";
        } else if (prefix.equals("xml")) {
            return;
        }

        if (namespaces == null) {
            namespaces = new ArrayList<>(2);
        }
        namespaces.add(prefix);
        namespaces.add(uri);
    }

    public void endPrefixMapping(String prefix) throws SAXException {
    }

    public void startCDATA() throws SAXException {
        isCDATA = true;
        if (CDATABuffer == null) {
            CDATABuffer = new StringBuffer();
        } else {
            CDATABuffer.setLength(0);
        }
    }

    public void characters(char[] ch, int start, int length)
            throws SAXException {
        if (isCDATA) {
            CDATABuffer.append(ch, start, length);
        }
    }

    public void endCDATA() throws SAXException {
        isCDATA = false;
        CDATABuffer.setLength(0);
    }

    public void comment(char[] ch, int start, int length) throws SAXException {
    }

    public void endDTD() throws SAXException {
    }

    public void endEntity(String name) throws SAXException {
    }

    public void startDTD(String name, String publicId, String systemId)
            throws SAXException {
    }

    public void startEntity(String name) throws SAXException {
    }

    /**
     * Used to report a {@link SAXException}to the {@link XMLReporter}
     * registered with this handler.
     */
    protected void reportException(String type, SAXException e)
            throws SAXException {

        if (reporter != null) {
            try {
                reporter.report(e.getMessage(), type, e, getCurrentLocation());
            } catch (XMLStreamException e1) {
                throw new SAXException(e1);
            }
        }
    }

    /**
     * Parses an XML qualified name, and places the resulting prefix and local
     * name in the provided String array.
     *
     * @param qName The qualified name to parse.
     * @param results An array where parse results will be placed. The prefix
     *            will be placed at <code>results[0]</code>, and the local
     *            part at <code>results[1]</code>
     */
    public static final void parseQName(String qName, String[] results) {

        String prefix, local;
        int idx = qName.indexOf(':');
        if (idx >= 0) {
            prefix = qName.substring(0, idx);
            local = qName.substring(idx + 1);
        } else {
            prefix = "";
            local = qName;
        }
        results[0] = prefix;
        results[1] = local;
    }

    /**
     * {@Link Location}implementation used to expose details from a SAX
     * {@link Locator}.
     *
     * @author christian
     */
    private static final class SAXLocation implements Location {

        private int lineNumber;
        private int columnNumber;
        private String publicId;
        private String systemId;
        private SAXLocation(Locator locator) {
            lineNumber = locator.getLineNumber();
            columnNumber = locator.getColumnNumber();
            publicId = locator.getPublicId();
            systemId = locator.getSystemId();
        }

        public int getLineNumber() {
            return lineNumber;
        }

        public int getColumnNumber() {
            return columnNumber;
        }

        public int getCharacterOffset() {
            return -1;
        }

        public String getPublicId() {
            return publicId;
        }

        public String getSystemId() {
            return systemId;
        }
    }
}