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.beanutils;
019
020import java.util.ArrayList;
021import java.util.Iterator;
022import java.util.List;
023
024import org.apache.commons.beanutils.DynaBean;
025import org.apache.commons.beanutils.DynaClass;
026import org.apache.commons.beanutils.DynaProperty;
027import org.apache.commons.configuration2.Configuration;
028import org.apache.commons.logging.Log;
029import org.apache.commons.logging.LogFactory;
030
031/**
032 * The {@code ConfigurationDynaClass} dynamically determines properties for a {@code ConfigurationDynaBean} from a
033 * wrapped configuration-collection {@link org.apache.commons.configuration2.Configuration} instance.
034 *
035 * @since 1.0-rc1
036 */
037public class ConfigurationDynaClass implements DynaClass {
038
039    /** The logger. */
040    private static final Log LOG = LogFactory.getLog(ConfigurationDynaClass.class);
041
042    /** Stores the associated configuration. */
043    private final Configuration configuration;
044
045    /**
046     * Constructs an instance of a {@code ConfigurationDynaClass} wrapping the specified {@code Configuration} instance.
047     *
048     * @param configuration {@code Configuration} instance.
049     */
050    public ConfigurationDynaClass(final Configuration configuration) {
051        if (LOG.isTraceEnabled()) {
052            LOG.trace("ConfigurationDynaClass(" + configuration + ")");
053        }
054        this.configuration = configuration;
055    }
056
057    @Override
058    public DynaProperty getDynaProperty(final String name) {
059        if (LOG.isTraceEnabled()) {
060            LOG.trace("getDynaProperty(" + name + ")");
061        }
062
063        if (name == null) {
064            throw new IllegalArgumentException("Property name must not be null!");
065        }
066
067        final Object value = configuration.getProperty(name);
068        if (value == null) {
069            return null;
070        }
071        Class<?> type = value.getClass();
072
073        if (type == Byte.class) {
074            type = Byte.TYPE;
075        }
076        if (type == Character.class) {
077            type = Character.TYPE;
078        } else if (type == Boolean.class) {
079            type = Boolean.TYPE;
080        } else if (type == Double.class) {
081            type = Double.TYPE;
082        } else if (type == Float.class) {
083            type = Float.TYPE;
084        } else if (type == Integer.class) {
085            type = Integer.TYPE;
086        } else if (type == Long.class) {
087            type = Long.TYPE;
088        } else if (type == Short.class) {
089            type = Short.TYPE;
090        }
091
092        return new DynaProperty(name, type);
093    }
094
095    @Override
096    public DynaProperty[] getDynaProperties() {
097        if (LOG.isTraceEnabled()) {
098            LOG.trace("getDynaProperties()");
099        }
100
101        final Iterator<String> keys = configuration.getKeys();
102        final List<DynaProperty> properties = new ArrayList<>();
103        while (keys.hasNext()) {
104            final String key = keys.next();
105            final DynaProperty property = getDynaProperty(key);
106            properties.add(property);
107        }
108
109        final DynaProperty[] propertyArray = new DynaProperty[properties.size()];
110        properties.toArray(propertyArray);
111        if (LOG.isDebugEnabled()) {
112            LOG.debug("Found " + properties.size() + " properties.");
113        }
114
115        return propertyArray;
116    }
117
118    @Override
119    public String getName() {
120        return ConfigurationDynaBean.class.getName();
121    }
122
123    @Override
124    public DynaBean newInstance() throws IllegalAccessException, InstantiationException {
125        return new ConfigurationDynaBean(configuration);
126    }
127}