/*

 * 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 com.sun.xml.internal.bind.v2.runtime.output;

import java.io.IOException;

import javax.xml.stream.XMLStreamException;

import com.sun.xml.internal.bind.util.AttributesImpl;

import com.sun.xml.internal.bind.v2.runtime.XMLSerializer;

import org.xml.sax.ContentHandler;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.LocatorImpl;

/**

 * {@link XmlOutput} implementation that writes to SAX {@link ContentHandler}.

 *

 * @author Kohsuke Kawaguchi

 */

public class SAXOutput extends XmlOutputAbstractImpl {

    protected final ContentHandler out;

    public SAXOutput(ContentHandler out) {

        this.out = out;

        out.setDocumentLocator(new LocatorImpl());

    }

    private String elementNsUri,elementLocalName,elementQName;

    private char[] buf = new char[256];

    private final AttributesImpl atts = new AttributesImpl();

    // not called if we are generating fragments

    @Override

    public void startDocument(XMLSerializer serializer, boolean fragment, int[] nsUriIndex2prefixIndex, NamespaceContextImpl nsContext) throws SAXException, IOException, XMLStreamException {

        super.startDocument(serializer, fragment,nsUriIndex2prefixIndex,nsContext);

        if(!fragment)

            out.startDocument();

    }

    public void endDocument(boolean fragment) throws SAXException, IOException, XMLStreamException {

        if(!fragment)

            out.endDocument();

        super.endDocument(fragment);

    }

    public void beginStartTag(int prefix, String localName) {

        elementNsUri = nsContext.getNamespaceURI(prefix);

        elementLocalName = localName;

        elementQName = getQName(prefix,localName);

        atts.clear();

    }

    public void attribute(int prefix, String localName, String value) {

        String qname;

        String nsUri;

        if(prefix==-1) {

            nsUri = "";

            qname = localName;

        } else {

            nsUri = nsContext.getNamespaceURI(prefix);

            String p = nsContext.getPrefix(prefix);

            if(p.length()==0)

                // this is more likely a bug in the application code (NamespacePrefixMapper implementation)

                // this only happens when it tries to assign "" prefix to a non-"" URI,

                // which is by itself violation of namespace rec. But let's just be safe.

                // See http://forums.java.net/jive/thread.jspa?messageID=212598#212598

                qname = localName;

            else

                qname = p +':'+localName;

        }

        atts.addAttribute( nsUri, localName, qname, "CDATA", value );

    }

    public void endStartTag() throws SAXException {

        NamespaceContextImpl.Element ns = nsContext.getCurrent();

        if(ns!=null) {

            int sz = ns.count();

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

                String p = ns.getPrefix(i);

                String uri = ns.getNsUri(i);

                if(uri.length()==0 && ns.getBase()==1)

                    continue;   // no point in defining xmlns='' on the root

                out.startPrefixMapping(p,uri);

            }

        }

        out.startElement(elementNsUri,elementLocalName,elementQName,atts);

    }

    public void endTag(int prefix, String localName) throws SAXException {

        out.endElement(

            nsContext.getNamespaceURI(prefix),

            localName,

            getQName(prefix, localName)

        );

        NamespaceContextImpl.Element ns = nsContext.getCurrent();

        if(ns!=null) {

            int sz = ns.count();

            for( int i=sz-1; i>=0; i-- ) {

                String p = ns.getPrefix(i);

                String uri = ns.getNsUri(i);

                if(uri.length()==0 && ns.getBase()==1)

                    continue;   // no point in definint xmlns='' on the root

                out.endPrefixMapping(p);

            }

        }

    }

    private String getQName(int prefix, String localName) {

        String qname;

        String p = nsContext.getPrefix(prefix);

        if(p.length()==0)

            qname = localName;

        else

            qname = p+':'+localName;

        return qname;

    }

    public void text(String value, boolean needsSP) throws IOException, SAXException, XMLStreamException {

        int vlen = value.length();

        if(buf.length<=vlen) {

            buf = new char[Math.max(buf.length*2,vlen+1)];

        }

        if(needsSP) {

            value.getChars(0,vlen,buf,1);

            buf[0] = ' ';

        } else {

            value.getChars(0,vlen,buf,0);

        }

        out.characters(buf,0,vlen+(needsSP?1:0));

    }

    public void text(Pcdata value, boolean needsSP) throws IOException, SAXException, XMLStreamException {

        int vlen = value.length();

        if(buf.length<=vlen) {

            buf = new char[Math.max(buf.length*2,vlen+1)];

        }

        if(needsSP) {

            value.writeTo(buf,1);

            buf[0] = ' ';

        } else {

            value.writeTo(buf,0);

        }

        out.characters(buf,0,vlen+(needsSP?1:0));

    }

}