FixedDtdEntityResolver.java

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/*
 * Gridarta MMORPG map editor for Crossfire, Daimonin and similar games.
 * Copyright (C) 2000-2015 The Gridarta Developers.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

package net.sf.gridarta.utils.xml;

import java.io.IOException;
import java.io.InputStream;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class FixedDtdEntityResolver implements EntityResolver {

    @NotNull
    private final String systemId;

    @NotNull
    private final String resourceName;

    public FixedDtdEntityResolver(@NotNull final String systemId, @NotNull final String resourceName) {
        this.systemId = systemId;
        this.resourceName = resourceName;
    }

    @NotNull
    @Override
    public InputSource resolveEntity(@Nullable final String publicId, @NotNull final String systemId) throws SAXException, IOException {
        if (!systemId.equals(this.systemId) && !systemId.endsWith("/" + this.systemId)) {
            throw new SAXException("unsupported system ID '" + systemId + "'");
        }
        final InputStream inputStream = FixedDtdEntityResolver.class.getResourceAsStream(resourceName);
        if (inputStream == null) {
            throw new IOException("the resource '" + resourceName + "' does not exist");
        }
        return new InputSource(inputStream);
    }

}