    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 *     http://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    /** Stores the actual configuration. */
    033    private Configuration config;
    034
    035    /**
    036     * Creates a new instance of {@code BaseConfigurationXMLReader}.
    037     */
    038    public BaseConfigurationXMLReader() {
    039    }
    040
    041    /**
    042     * Creates a new instance of {@code BaseConfigurationXMLReader} and sets the configuration object to be parsed.
    043     *
    044     * @param conf the configuration to be parsed
    045     */
    046    public BaseConfigurationXMLReader(final Configuration conf) {
    047        this();
    048        setConfiguration(conf);
    049    }
    050
    051    /**
    052     * Gets the actual configuration to be processed.
    053     *
    054     * @return the actual configuration
    055     */
    056    public Configuration getConfiguration() {
    057        return config;
    058    }
    059
    060    /**
    061     * Sets the configuration to be processed.
    062     *
    063     * @param conf the configuration
    064     */
    065    public void setConfiguration(final Configuration conf) {
    066        config = conf;
    067    }
    068
    069    /**
    070     * Gets the configuration to be processed.
    071     *
    072     * @return the actual configuration
    073     */
    074    @Override
    075    public Configuration getParsedConfiguration() {
    076        return getConfiguration();
    077    }
    078
    079    /**
    080     * The main SAX event generation method. This element uses an internal {@code HierarchicalConfigurationConverter} object
    081     * to iterate over all keys in the actual configuration and to generate corresponding SAX events.
    082     */
    083    @Override
    084    protected void processKeys() {
    085        fireElementStart(getRootName(), null);
    086        new SAXConverter().process(getConfiguration());
    087        fireElementEnd(getRootName());
    088    }
    089
    090    /**
    091     * An internally used helper class to iterate over all configuration keys ant to generate corresponding SAX events.
    092     */
    093    final class SAXConverter extends HierarchicalConfigurationConverter {
    094        /**
    095         * Callback for the start of an element.
    096         *
    097         * @param name the element name
    098         * @param value the element value
    099         */
    100        @Override
    101        protected void elementStart(final String name, final Object value) {
    102            fireElementStart(name, null);
    103            if (value != null) {
    104                fireCharacters(value.toString());
    105            }
    106        }
    107
    108        /**
    109         * Callback for the end of an element.
    110         *
    111         * @param name the element name
    112         */
    113        @Override
    114        protected void elementEnd(final String name) {
    115            fireElementEnd(name);
    116        }
    117    }
    118}