com.ibatis.sqlmap.engine.builder.xml.SqlMapClasspathEntityResolver Maven / Gradle / Ivy

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The jBATIS persistence framework will help you to significantly reduce the amount of Java code that you normally need to access a relational database. iBATIS simply maps JavaBeans to SQL statements using a very simple XML descriptor.

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/*
 *  Copyright 2004 Clinton Begin
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.ibatis.sqlmap.engine.builder.xml;

import com.ibatis.common.resources.*;
import org.xml.sax.*;

import java.io.*;
import java.util.*;

/**
 * Offline entity resolver for the iBATIS DTDs
 */
public class SqlMapClasspathEntityResolver implements EntityResolver {

    private static final String SQL_MAP_CONFIG_DTD = "com/ibatis/sqlmap/engine/builder/xml/sql-map-config-2.dtd";
    private static final String SQL_MAP_DTD = "com/ibatis/sqlmap/engine/builder/xml/sql-map-2.dtd";
    private static final String SQL_MAP_DTD_2_4 = "com/ibatis/sqlmap/engine/builder/xml/sql-map-2.4.dtd";

    private static final Map doctypeMap = new HashMap();

    static {
        doctypeMap.put("http://www.ibatis.com/dtd/sql-map-config-2.dtd".toUpperCase(Locale.ROOT), SQL_MAP_CONFIG_DTD);
        doctypeMap.put("http://ibatis.apache.org/dtd/sql-map-config-2.dtd".toUpperCase(Locale.ROOT), SQL_MAP_CONFIG_DTD);
        doctypeMap.put("-//iBATIS.com//DTD SQL Map Config 2.0//EN".toUpperCase(Locale.ROOT), SQL_MAP_CONFIG_DTD);
        doctypeMap.put("-//ibatis.apache.org//DTD SQL Map Config 2.0//EN".toUpperCase(Locale.ROOT), SQL_MAP_CONFIG_DTD);

        doctypeMap.put("http://www.ibatis.com/dtd/sql-map-2.dtd".toUpperCase(Locale.ROOT), SQL_MAP_DTD);
        doctypeMap.put("http://ibatis.apache.org/dtd/sql-map-2.dtd".toUpperCase(Locale.ROOT), SQL_MAP_DTD);
        doctypeMap.put("-//iBATIS.com//DTD SQL Map 2.0//EN".toUpperCase(Locale.ROOT), SQL_MAP_DTD);
        doctypeMap.put("-//iBATIS.org//DTD SQL Map 2.4//EN".toUpperCase(Locale.ROOT), SQL_MAP_DTD_2_4);
        doctypeMap.put("-//ibatis.apache.org//DTD SQL Map 2.0//EN".toUpperCase(Locale.ROOT), SQL_MAP_DTD);
    }

    /**
     * Converts a public DTD into a local one
     *
     * @param publicId
     *            Unused but required by EntityResolver interface
     * @param systemId
     *            The DTD that is being requested
     * @return The InputSource for the DTD
     * @throws SAXException
     *             If anything goes wrong
     */
    @Override
    public InputSource resolveEntity(String publicId, String systemId) throws SAXException {

        if (publicId != null)
            publicId = publicId.toUpperCase(Locale.ROOT);
        if (systemId != null)
            systemId = systemId.toUpperCase(Locale.ROOT);

        InputSource source = null;
        try {
            String path = (String) doctypeMap.get(publicId);
            source = getInputSource(path, source);
            if (source == null) {
                path = (String) doctypeMap.get(systemId);
                source = getInputSource(path, source);
            }
        } catch (Exception e) {
            throw new SAXException(e.toString());
        }
        return source;
    }

    private InputSource getInputSource(String path, InputSource source) {
        if (path != null) {
            InputStream in = null;
            try {
                in = Resources.getResourceAsStream(path);
                source = new InputSource(in);
            } catch (IOException e) {
                // ignore, null is ok
            }
        }
        return source;
    }

}