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 * 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.

 *

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package com.sun.xml.internal.bind.v2.runtime;

import java.io.IOException;

import javax.xml.stream.XMLStreamException;

import com.sun.istack.internal.FinalArrayList;

import com.sun.istack.internal.SAXException2;

import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.DefaultHandler;

/**

 * Receives SAX2 events and send the equivalent events to

 * {@link XMLSerializer}

 *

 * @author

 *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)

 */

final class ContentHandlerAdaptor extends DefaultHandler {

    /** Stores newly declared prefix-URI mapping. */

    private final FinalArrayList<String> prefixMap = new FinalArrayList<String>();

    /** Events will be sent to this object. */

    private final XMLSerializer serializer;

    private final StringBuffer text = new StringBuffer();

    ContentHandlerAdaptor( XMLSerializer _serializer ) {

        this.serializer = _serializer;

    }

    public void startDocument() {

        prefixMap.clear();

    }

    public void startPrefixMapping(String prefix, String uri) {

        prefixMap.add(prefix);

        prefixMap.add(uri);

    }

    private boolean containsPrefixMapping(String prefix, String uri) {

        for( int i=0; i<prefixMap.size(); i+=2 ) {

            if(prefixMap.get(i).equals(prefix)

            && prefixMap.get(i+1).equals(uri))

                return true;

        }

        return false;

    }

    public void startElement(String namespaceURI, String localName, String qName, Attributes atts)

        throws SAXException {

        try {

            flushText();

            int len = atts.getLength();

            String p = getPrefix(qName);

            // is this prefix going to be declared on this element?

            if(containsPrefixMapping(p,namespaceURI))

                serializer.startElementForce(namespaceURI,localName,p,null);

            else

                serializer.startElement(namespaceURI,localName, p,null);

            // declare namespace events

            for( int i=0; i<prefixMap.size(); i+=2 ) {

                // forcibly set this binding, instead of using declareNsUri.

                // this guarantees that namespaces used in DOM will show up

                // as-is in the marshalled output (instead of reassigned to something else,

                // which may happen if you'd use declareNsUri.)

                serializer.getNamespaceContext().force(

                    prefixMap.get(i+1), prefixMap.get(i) );

            }

            // make sure namespaces needed by attributes are bound

            for( int i=0; i<len; i++ ) {

                String qname = atts.getQName(i);

                if(qname.startsWith("xmlns") || atts.getURI(i).length() == 0)

                    continue;

                String prefix = getPrefix(qname);

                serializer.getNamespaceContext().declareNamespace(

                    atts.getURI(i), prefix, true );

            }

            serializer.endNamespaceDecls(null);

            // fire attribute events

            for( int i=0; i<len; i++ ) {

                // be defensive.

                if(atts.getQName(i).startsWith("xmlns"))

                    continue;

                serializer.attribute( atts.getURI(i), atts.getLocalName(i), atts.getValue(i));

            }

            prefixMap.clear();

            serializer.endAttributes();

        } catch (IOException e) {

            throw new SAXException2(e);

        } catch (XMLStreamException e) {

            throw new SAXException2(e);

        }

    }

    private String getPrefix(String qname) {

        int idx = qname.indexOf(':');

        String prefix = (idx==-1)?qname:qname.substring(0,idx);

        return prefix;

    }

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

        try {

            flushText();

            serializer.endElement();

        } catch (IOException e) {

            throw new SAXException2(e);

        } catch (XMLStreamException e) {

            throw new SAXException2(e);

        }

    }

    private void flushText() throws SAXException, IOException, XMLStreamException {

        if( text.length()!=0 ) {

            serializer.text(text.toString(),null);

            text.setLength(0);

        }

    }

    public void characters(char[] ch, int start, int length) {

        text.append(ch,start,length);

    }

}