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/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* Copyright (c) 2006 - 2009 Object Refinery Ltd, Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.xmlns.parser;
import java.util.ArrayList;
import java.util.Properties;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* A read handler that creates property-structures (name-value-pairs) and returns the properties as java.util.Properties
* collection.
*
* @author Thomas Morgner
*/
public class PropertiesReadHandler extends AbstractXmlReadHandler
{
private ArrayList propertyHandlers;
private String propertyTagName;
private Properties result;
/**
* Creates a properties read-handler using "property" as child-tagname.
*/
public PropertiesReadHandler()
{
this("property");
}
/**
* Creates a properties read-handler using the specified propertyTagName as child-tagname.
*
* @param propertyTagName the tag name for the child elements that define the properties.
*/
public PropertiesReadHandler(final String propertyTagName)
{
if (propertyTagName == null)
{
throw new NullPointerException();
}
this.propertyHandlers = new ArrayList();
this.propertyTagName = propertyTagName;
}
/**
* Returns the handler for a child element.
*
* @param tagName the tag name.
* @param atts the attributes.
* @return the handler or null, if the tagname is invalid.
* @throws SAXException if there is a parsing error.
*/
protected XmlReadHandler getHandlerForChild(final String uri,
final String tagName,
final Attributes atts)
throws SAXException
{
if (isSameNamespace(uri) == false)
{
return null;
}
if (tagName.equals(propertyTagName))
{
final PropertyReadHandler prh = new PropertyReadHandler();
propertyHandlers.add(prh);
return prh;
}
return null;
}
/**
* Done parsing.
*
* @throws SAXException if there is a parsing error.
*/
protected void doneParsing() throws SAXException
{
result = new Properties();
for (int i = 0; i < propertyHandlers.size(); i++)
{
final PropertyReadHandler handler =
(PropertyReadHandler) propertyHandlers.get(i);
result.setProperty(handler.getName(), handler.getResult());
}
}
/**
* Returns the resulting properties collection, never null.
*
* @return the properties.
*/
public Properties getResult()
{
return result;
}
/**
* Returns the resulting properties collection, never null.
*
* @return the properties.
* @throws SAXException if there is a parsing error.
*/
public Object getObject() throws SAXException
{
return result;
}
}
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