/*
* 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 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;
import java.beans.IntrospectionException;
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;
}
}