/*
 * Copyright (c) 1997, 2011, 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.
 *
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package com.sun.tools.internal.xjc.reader.relaxng;

import com.sun.tools.internal.xjc.reader.Const;
import com.sun.tools.internal.xjc.reader.internalizer.AbstractReferenceFinderImpl;
import com.sun.tools.internal.xjc.reader.internalizer.DOMForest;
import com.sun.tools.internal.xjc.reader.internalizer.InternalizationLogic;

import org.w3c.dom.Element;
import org.xml.sax.Attributes;
import org.xml.sax.helpers.XMLFilterImpl;

/**
 * RELAX NG specific internalization logic.
 *
 * @author
 *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
public class RELAXNGInternalizationLogic implements InternalizationLogic {

    /**
     * This filter looks for &lt;xs:import> and &lt;xs:include>
     * and parses those documents referenced by them.
     */
    private static final class ReferenceFinder extends AbstractReferenceFinderImpl {
        ReferenceFinder( DOMForest parent ) {
            super(parent);
        }

        protected String findExternalResource( String nsURI, String localName, Attributes atts) {
            if( Const.RELAXNG_URI.equals(nsURI)
            && ("include".equals(localName) || "externalRef".equals(localName) ) )
                return atts.getValue("href");
            else
                return null;
        }
    };

    public XMLFilterImpl createExternalReferenceFinder(DOMForest parent) {
        return new ReferenceFinder(parent);
    }

    public boolean checkIfValidTargetNode(DOMForest parent, Element bindings, Element target) {
        return Const.RELAXNG_URI.equals(target.getNamespaceURI());
    }

    public Element refineTarget(Element target) {
        // no refinement necessary
        return target;
    }

}
