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Tools to assist in the reading of configuration/preferences files in
various formats
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.commons.configuration.beanutils;
import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.beanutils.DynaClass;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationMap;
import org.apache.commons.configuration.SubsetConfiguration;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* The ConfigurationDynaBean dynamically reads and writes
* configurations properties from a wrapped configuration-collection
* {@link org.apache.commons.configuration.Configuration} instance. It also
* implements a {@link java.util.Map} interface so that it can be used in
* JSP 2.0 Expression Language expressions.
*
* The ConfigurationDynaBean maps nested and mapped properties
* to the appropriate Configuration subset using the
* {@link org.apache.commons.configuration.Configuration#subset}
* method. Similarly, indexed properties reference lists of configuration
* properties using the
* {@link org.apache.commons.configuration.Configuration#getList(String)}
* method. Setting an indexed property is supported, too.
*
* Note: Some of the methods expect that a dot (".") is used as
* property delimiter for the wrapped configuration. This is true for most of
* the default configurations. Hierarchical configurations, for which a specific
* expression engine is set, may cause problems.
*
* @author Ricardo Gladwell
* @version $Id: ConfigurationDynaBean.java 1067771 2011-02-06 21:24:09Z oheger $
* @since 1.0-rc1
*/
public class ConfigurationDynaBean extends ConfigurationMap implements DynaBean
{
/** Constant for the property delimiter.*/
private static final String PROPERTY_DELIMITER = ".";
/** The logger.*/
private static Log log = LogFactory.getLog(ConfigurationDynaBean.class);
/**
* Creates a new instance of ConfigurationDynaBean and sets
* the configuration this bean is associated with.
*
* @param configuration the configuration
*/
public ConfigurationDynaBean(Configuration configuration)
{
super(configuration);
if (log.isTraceEnabled())
{
log.trace("ConfigurationDynaBean(" + configuration + ")");
}
}
public void set(String name, Object value)
{
if (log.isTraceEnabled())
{
log.trace("set(" + name + "," + value + ")");
}
if (value == null)
{
throw new NullPointerException("Error trying to set property to null.");
}
if (value instanceof Collection)
{
Collection collection = (Collection) value;
Iterator iterator = collection.iterator();
while (iterator.hasNext())
{
getConfiguration().addProperty(name, iterator.next());
}
}
else if (value.getClass().isArray())
{
int length = Array.getLength(value);
for (int i = 0; i < length; i++)
{
getConfiguration().addProperty(name, Array.get(value, i));
}
}
else
{
getConfiguration().setProperty(name, value);
}
}
public Object get(String name)
{
if (log.isTraceEnabled())
{
log.trace("get(" + name + ")");
}
// get configuration property
Object result = getConfiguration().getProperty(name);
if (result == null)
{
// otherwise attempt to create bean from configuration subset
Configuration subset = new SubsetConfiguration(getConfiguration(), name, PROPERTY_DELIMITER);
if (!subset.isEmpty())
{
result = new ConfigurationDynaBean(subset);
}
}
if (log.isDebugEnabled())
{
log.debug(name + "=[" + result + "]");
}
if (result == null)
{
throw new IllegalArgumentException("Property '" + name + "' does not exist.");
}
return result;
}
public boolean contains(String name, String key)
{
Configuration subset = getConfiguration().subset(name);
if (subset == null)
{
throw new IllegalArgumentException("Mapped property '" + name + "' does not exist.");
}
return subset.containsKey(key);
}
public Object get(String name, int index)
{
if (!checkIndexedProperty(name))
{
throw new IllegalArgumentException("Property '" + name
+ "' is not indexed.");
}
List list = getConfiguration().getList(name);
return list.get(index);
}
public Object get(String name, String key)
{
Configuration subset = getConfiguration().subset(name);
if (subset == null)
{
throw new IllegalArgumentException("Mapped property '" + name + "' does not exist.");
}
return subset.getProperty(key);
}
public DynaClass getDynaClass()
{
return new ConfigurationDynaClass(getConfiguration());
}
public void remove(String name, String key)
{
Configuration subset = new SubsetConfiguration(getConfiguration(), name, PROPERTY_DELIMITER);
subset.setProperty(key, null);
}
public void set(String name, int index, Object value)
{
if (!checkIndexedProperty(name) && index > 0)
{
throw new IllegalArgumentException("Property '" + name
+ "' is not indexed.");
}
Object property = getConfiguration().getProperty(name);
if (property instanceof List)
{
List list = (List) property;
list.set(index, value);
getConfiguration().setProperty(name, list);
}
else if (property.getClass().isArray())
{
Array.set(property, index, value);
}
else if (index == 0)
{
getConfiguration().setProperty(name, value);
}
}
public void set(String name, String key, Object value)
{
getConfiguration().setProperty(name + "." + key, value);
}
/**
* Tests whether the given name references an indexed property. This
* implementation tests for properties of type list or array. If the
* property does not exist, an exception is thrown.
*
* @param name the name of the property to check
* @return a flag whether this is an indexed property
* @throws IllegalArgumentException if the property does not exist
*/
private boolean checkIndexedProperty(String name)
{
Object property = getConfiguration().getProperty(name);
if (property == null)
{
throw new IllegalArgumentException("Property '" + name
+ "' does not exist.");
}
return (property instanceof List) || property.getClass().isArray();
}
}