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
033 * a {@code ConfigurationDynaBean} from a wrapped configuration-collection
034 * {@link org.apache.commons.configuration2.Configuration} instance.
035 *
036 * @since 1.0-rc1
037 */
038public class ConfigurationDynaClass implements DynaClass
039{
040    /** The logger.*/
041    private static final Log LOG = LogFactory.getLog(ConfigurationDynaClass.class);
042
043    /** Stores the associated configuration.*/
044    private final Configuration configuration;
045
046    /**
047     * Construct an instance of a {@code ConfigurationDynaClass}
048     * wrapping the specified {@code Configuration} instance.
049     * @param configuration {@code Configuration} instance.
050     */
051    public ConfigurationDynaClass(final Configuration configuration)
052    {
053        super();
054        if (LOG.isTraceEnabled())
055        {
056            LOG.trace("ConfigurationDynaClass(" + configuration + ")");
057        }
058        this.configuration = configuration;
059    }
060
061    @Override
062    public DynaProperty getDynaProperty(final String name)
063    {
064        if (LOG.isTraceEnabled())
065        {
066            LOG.trace("getDynaProperty(" + name + ")");
067        }
068
069        if (name == null)
070        {
071            throw new IllegalArgumentException("Property name must not be null!");
072        }
073
074        final Object value = configuration.getProperty(name);
075        if (value == null)
076        {
077            return null;
078        }
079        Class<?> type = value.getClass();
080
081        if (type == Byte.class)
082        {
083            type = Byte.TYPE;
084        }
085        if (type == Character.class)
086        {
087            type = Character.TYPE;
088        }
089        else if (type == Boolean.class)
090        {
091            type = Boolean.TYPE;
092        }
093        else if (type == Double.class)
094        {
095            type = Double.TYPE;
096        }
097        else if (type == Float.class)
098        {
099            type = Float.TYPE;
100        }
101        else if (type == Integer.class)
102        {
103            type = Integer.TYPE;
104        }
105        else if (type == Long.class)
106        {
107            type = Long.TYPE;
108        }
109        else if (type == Short.class)
110        {
111            type = Short.TYPE;
112        }
113
114        return new DynaProperty(name, type);
115    }
116
117    @Override
118    public DynaProperty[] getDynaProperties()
119    {
120        if (LOG.isTraceEnabled())
121        {
122            LOG.trace("getDynaProperties()");
123        }
124
125        final Iterator<String> keys = configuration.getKeys();
126        final List<DynaProperty> properties = new ArrayList<>();
127        while (keys.hasNext())
128        {
129            final String key = keys.next();
130            final DynaProperty property = getDynaProperty(key);
131            properties.add(property);
132        }
133
134        final DynaProperty[] propertyArray = new DynaProperty[properties.size()];
135        properties.toArray(propertyArray);
136        if (LOG.isDebugEnabled())
137        {
138            LOG.debug("Found " + properties.size() + " properties.");
139        }
140
141        return propertyArray;
142    }
143
144    @Override
145    public String getName()
146    {
147        return ConfigurationDynaBean.class.getName();
148    }
149
150    @Override
151    public DynaBean newInstance() throws IllegalAccessException, InstantiationException
152    {
153        return new ConfigurationDynaBean(configuration);
154    }
155}