/*

 * Copyright (c) 1997, 2012, 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.tools.internal.xjc.reader.internalizer;

import javax.xml.XMLConstants;

import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.SAXNotRecognizedException;

import org.xml.sax.SAXNotSupportedException;

import org.xml.sax.XMLReader;

import org.xml.sax.helpers.AttributesImpl;

import org.xml.sax.helpers.XMLFilterImpl;

/**

 * {@link XMLReader} filter for supporting

 *

 * @author Kohsuke Kawaguchi

 */

final class ContentHandlerNamespacePrefixAdapter extends XMLFilterImpl {

    /**

     */

    private boolean namespacePrefixes = false;

    private String[] nsBinding = new String[8];

    private int len;

    public ContentHandlerNamespacePrefixAdapter() {

    }

    public ContentHandlerNamespacePrefixAdapter(XMLReader parent) {

        setParent(parent);

    }

    @Override

    public boolean getFeature(String name) throws SAXNotRecognizedException, SAXNotSupportedException {

        if(name.equals(PREFIX_FEATURE))

            return namespacePrefixes;

        return super.getFeature(name);

    }

    @Override

    public void setFeature(String name, boolean value) throws SAXNotRecognizedException, SAXNotSupportedException {

        if(name.equals(PREFIX_FEATURE)) {

            this.namespacePrefixes = value;

            return;

        }

        if(name.equals(NAMESPACE_FEATURE) && value)

            return;

        super.setFeature(name, value);

    }

    @Override

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

        if (XMLConstants.XML_NS_URI.equals(uri)) return; //xml prefix shall not be declared based on jdk api javadoc

        if(len==nsBinding.length) {

            // reallocate

            String[] buf = new String[nsBinding.length*2];

            System.arraycopy(nsBinding,0,buf,0,nsBinding.length);

            nsBinding = buf;

        }

        nsBinding[len++] = prefix;

        nsBinding[len++] = uri;

        super.startPrefixMapping(prefix,uri);

    }

    @Override

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

        if(namespacePrefixes) {

            this.atts.setAttributes(atts);

            // add namespace bindings back as attributes

            for( int i=0; i<len; i+=2 ) {

                String prefix = nsBinding[i];

                if(prefix.length()==0)

                    this.atts.addAttribute(XMLConstants.XML_NS_URI,"xmlns","xmlns","CDATA",nsBinding[i+1]);

                else

                    this.atts.addAttribute(XMLConstants.XML_NS_URI,prefix,"xmlns:"+prefix,"CDATA",nsBinding[i+1]);

            }

            atts = this.atts;

        }

        len=0;

        super.startElement(uri, localName, qName, atts);

    }

    private final AttributesImpl atts = new AttributesImpl();

    private static final String PREFIX_FEATURE = "http://xml.org/sax/features/namespace-prefixes";

    private static final String NAMESPACE_FEATURE = "http://xml.org/sax/features/namespaces";

}