    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *     https://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.configuration2;
    019
    020/**
    021 * <p>
    022 * A specialized SAX2 XML parser that processes configuration objects.
    023 * </p>
    024 *
    025 * <p>
    026 * This class mimics to be a SAX compliant XML parser. It is able to iterate over the keys in a configuration object and
    027 * to generate corresponding SAX events. By registering a {@code ContentHandler} at an instance it is possible to
    028 * perform XML processing on a configuration object.
    029 * </p>
    030 */
    031public class BaseConfigurationXMLReader extends ConfigurationXMLReader {
    032
    033    /**
    034     * An internally used helper class to iterate over all configuration keys ant to generate corresponding SAX events.
    035     */
    036    final class SAXConverter extends HierarchicalConfigurationConverter {
    037
    038        /**
    039         * Callback for the end of an element.
    040         *
    041         * @param name the element name
    042         */
    043        @Override
    044        protected void elementEnd(final String name) {
    045            fireElementEnd(name);
    046        }
    047
    048        /**
    049         * Callback for the start of an element.
    050         *
    051         * @param name the element name
    052         * @param value the element value
    053         */
    054        @Override
    055        protected void elementStart(final String name, final Object value) {
    056            fireElementStart(name, null);
    057            if (value != null) {
    058                fireCharacters(value.toString());
    059            }
    060        }
    061    }
    062
    063    /** Stores the actual configuration. */
    064    private Configuration config;
    065
    066    /**
    067     * Creates a new instance of {@code BaseConfigurationXMLReader}.
    068     */
    069    public BaseConfigurationXMLReader() {
    070    }
    071
    072    /**
    073     * Creates a new instance of {@code BaseConfigurationXMLReader} and sets the configuration object to be parsed.
    074     *
    075     * @param conf the configuration to be parsed
    076     */
    077    public BaseConfigurationXMLReader(final Configuration conf) {
    078        this();
    079        setConfiguration(conf);
    080    }
    081
    082    /**
    083     * Gets the actual configuration to be processed.
    084     *
    085     * @return the actual configuration
    086     */
    087    public Configuration getConfiguration() {
    088        return config;
    089    }
    090
    091    /**
    092     * Gets the configuration to be processed.
    093     *
    094     * @return the actual configuration
    095     */
    096    @Override
    097    public Configuration getParsedConfiguration() {
    098        return getConfiguration();
    099    }
    100
    101    /**
    102     * The main SAX event generation method. This element uses an internal {@code HierarchicalConfigurationConverter} object
    103     * to iterate over all keys in the actual configuration and to generate corresponding SAX events.
    104     */
    105    @Override
    106    protected void processKeys() {
    107        fireElementStart(getRootName(), null);
    108        new SAXConverter().process(getConfiguration());
    109        fireElementEnd(getRootName());
    110    }
    111
    112    /**
    113     * Sets the configuration to be processed.
    114     *
    115     * @param conf the configuration
    116     */
    117    public void setConfiguration(final Configuration conf) {
    118        config = conf;
    119    }
    120}