/*

 * Copyright (c) 2015, 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

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 */

package javax.xml.catalog;

import java.io.StringReader;

import java.util.Iterator;

import org.xml.sax.InputSource;

/**

 * A SAX EntityResolver/JAXP URIResolver that uses catalogs.

 *

 * <p>

 * This class implements both a SAX EntityResolver and a JAXP URIResolver.

 *

 *

 * @since 9

 */

final class CatalogResolverImpl implements CatalogResolver {

    Catalog catalog;

    /**

     * Construct an instance of the CatalogResolver from a Catalog.

     *

     * @param catalog A Catalog.

     */

    public CatalogResolverImpl(Catalog catalog) {

        this.catalog = catalog;

    }

    @Override

    public InputSource resolveEntity(String publicId, String systemId) {

        //Normalize publicId and systemId

        systemId = Normalizer.normalizeURI(systemId);

        publicId = Normalizer.normalizePublicId(Normalizer.decodeURN(publicId));

        //check whether systemId is an urn

        if (systemId != null && systemId.startsWith("urn:publicid:")) {

            systemId = Normalizer.decodeURN(systemId);

            if (publicId != null && !publicId.equals(systemId)) {

                systemId = null;

            } else {

                publicId = systemId;

                systemId = null;

            }

        }

        CatalogImpl c = (CatalogImpl)catalog;

        String resolvedSystemId = resolve(c, publicId, systemId);

        if (resolvedSystemId != null) {

            return new InputSource(resolvedSystemId);

        }

        GroupEntry.ResolveType resolveType = ((CatalogImpl) catalog).getResolve();

        switch (resolveType) {

            case IGNORE:

                return new InputSource(new StringReader(""));

            case STRICT:

                CatalogMessages.reportError(CatalogMessages.ERR_NO_MATCH,

                        new Object[]{publicId, systemId});

        }

        //no action, allow the parser to continue

        return null;

    }

    /**

     * Resolves the publicId or systemId to one specified in the catalog.

     * @param catalog the catalog

     * @param publicId the publicId

     * @param systemId the systemId

     * @return the resolved systemId if a match is found, null otherwise

     */

    String resolve(CatalogImpl catalog, String publicId, String systemId) {

        String resolvedSystemId = null;

        //search the current catalog

        catalog.reset();

        if (systemId != null) {

            resolvedSystemId = catalog.matchSystem(systemId);

        }

        if (resolvedSystemId == null) {

            resolvedSystemId = catalog.matchPublic(publicId);

        }

        //mark the catalog as having been searched before trying alternatives

        catalog.markAsSearched();

        //search alternative catalogs

        if (resolvedSystemId == null) {

            Iterator<Catalog> iter = catalog.catalogs().iterator();

            while (iter.hasNext()) {

                resolvedSystemId = resolve((CatalogImpl)iter.next(), publicId, systemId);

                if (resolvedSystemId != null) {

                    break;

                }

            }

        }

        return resolvedSystemId;

    }

}