/*
* 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) 2001 - 2013 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.modules.parser.bundle.layout.elements;
import java.beans.IntrospectionException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.pentaho.reporting.engine.classic.core.function.Expression;
import org.pentaho.reporting.engine.classic.core.function.FormulaExpression;
import org.pentaho.reporting.engine.classic.core.modules.parser.base.common.ExpressionPropertiesReadHandler;
import org.pentaho.reporting.engine.classic.core.modules.parser.base.compat.CompatibilityMapperUtil;
import org.pentaho.reporting.libraries.base.util.ObjectUtilities;
import org.pentaho.reporting.libraries.xmlns.parser.AbstractXmlReadHandler;
import org.pentaho.reporting.libraries.xmlns.parser.ParseException;
import org.pentaho.reporting.libraries.xmlns.parser.XmlReadHandler;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
public class AttributeExpressionReadHandler extends AbstractXmlReadHandler
{
private static final Log logger = LogFactory.getLog(AttributeExpressionReadHandler.class);
private Expression expression;
private String name;
private String namespace;
private String originalExpressionClass;
private String expressionClassName;
public AttributeExpressionReadHandler()
{
}
/**
* Starts parsing.
*
* @param attrs the attributes.
* @throws SAXException if there is a parsing error.
*/
protected void startParsing(final Attributes attrs)
throws SAXException
{
name = attrs.getValue(getUri(), "name");
if (name == null)
{
throw new SAXException("Required attribute 'name' is missing.");
}
namespace = attrs.getValue(getUri(), "namespace");
if (namespace == null)
{
throw new SAXException("Required attribute 'namespace' is missing.");
}
originalExpressionClass = attrs.getValue(getUri(), "class");
expressionClassName = CompatibilityMapperUtil.mapClassName(originalExpressionClass);
final String formula = attrs.getValue(getUri(), "formula");
if (expressionClassName == null)
{
if (formula != null)
{
final FormulaExpression expression = new FormulaExpression();
expression.setFormula(formula);
this.expression = expression;
this.expression.setName(name); // doesnt matter anyway, but it feels good :)
}
else
{
logger.warn("Required attribute 'class' is missing. Gracefully ignoring the error." + getLocator());
}
}
if (expression == null && expressionClassName != null)
{
expression = ObjectUtilities.loadAndInstantiate(expressionClassName, getClass(), Expression.class);
if (expression == null)
{
throw new ParseException("Expression '" + expressionClassName +
"' is not valid.", getLocator());
}
}
}
/**
* 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 ("properties".equals(tagName) && expression != null)
{
try
{
return new ExpressionPropertiesReadHandler(expression, originalExpressionClass, expressionClassName);
}
catch (IntrospectionException e)
{
throw new SAXException
("Unable to create Introspector for the specified expression.");
}
}
return null;
}
/**
* Returns the object for this element or null, if this element does not create an object.
*
* @return the object.
*/
public Object getObject()
{
return expression;
}
public Expression getExpression()
{
return expression;
}
public String getName()
{
return name;
}
public String getNamespace()
{
return namespace;
}
}