/*
* 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.metadata.parser;
import org.pentaho.reporting.engine.classic.core.function.Expression;
import org.pentaho.reporting.engine.classic.core.metadata.DefaultExpressionMetaData;
import org.pentaho.reporting.engine.classic.core.metadata.SharedBeanInfo;
import org.pentaho.reporting.engine.classic.core.metadata.builder.ExpressionMetaDataBuilder;
import org.pentaho.reporting.libraries.base.util.ObjectUtilities;
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.util.ArrayList;
/**
* @noinspection HardCodedStringLiteral
*/
public class ExpressionReadHandler extends AbstractMetaDataReadHandler {
private ArrayList<ExpressionPropertyReadHandler> propertyHandlers;
private SharedBeanInfo beanInfo;
private ExpressionMetaDataBuilder builder;
public ExpressionReadHandler() {
propertyHandlers = new ArrayList<ExpressionPropertyReadHandler>();
builder = new ExpressionMetaDataBuilder();
}
public ExpressionMetaDataBuilder getBuilder() {
return builder;
}
protected boolean isDerivedName() {
return true;
}
/**
* Starts parsing.
*
* @param attrs
* the attributes.
* @throws SAXException
* if there is a parsing error.
*/
protected void startParsing( final Attributes attrs ) throws SAXException {
super.startParsing( attrs );
getBuilder().layoutComputation( parseLayoutProcessorMode( attrs ) );
getBuilder().impl( parseExpressionImpl( attrs ) );
getBuilder().resultType( parseResultType( attrs ) );
getBuilder().bundle( getBundle(), "" );
this.beanInfo = new SharedBeanInfo( getBuilder().getImpl() );
}
private Class<?> parseResultType( final Attributes attrs ) throws ParseException {
final Class<?> resultType;
final String resultTypeText = attrs.getValue( getUri(), "result" );
if ( resultTypeText == null ) {
throw new ParseException( "Attribute 'result' is undefined", getLocator() );
}
try {
final ClassLoader loader = ObjectUtilities.getClassLoader( ExpressionReadHandler.class );
resultType = Class.forName( resultTypeText, false, loader );
} catch ( final Exception e ) {
throw new ParseException( "Attribute 'result' is not valid", e, getLocator() );
}
return resultType;
}
private int parseLayoutProcessorMode( final Attributes attrs ) {
final String layoutProcessorMode = attrs.getValue( getUri(), "layout-processor-mode" );
int layoutComputation;
if ( "global".equals( layoutProcessorMode ) ) {
layoutComputation = DefaultExpressionMetaData.GLOBAL_LAYOUT_PROCESSOR;
} else if ( "element".equals( layoutProcessorMode ) ) {
layoutComputation = DefaultExpressionMetaData.ELEMENT_LAYOUT_PROCESSOR;
} else {
layoutComputation = DefaultExpressionMetaData.NO_LAYOUT_PROCESSOR;
}
return layoutComputation;
}
private Class<? extends Expression> parseExpressionImpl( final Attributes attrs ) throws ParseException {
final String implText = attrs.getValue( getUri(), "class" );
Class<? extends Expression> expressionClass;
if ( implText == null ) {
throw new ParseException( "Attribute 'class' is undefined", getLocator() );
}
try {
expressionClass = ObjectUtilities.loadAndValidate( implText, ExpressionReadHandler.class, Expression.class );
if ( expressionClass == null ) {
throw new ParseException( "Attribute 'class' is not valid", getLocator() );
}
} catch ( final ParseException pe ) {
throw pe;
} catch ( final Exception e ) {
throw new ParseException( "Attribute 'class' is not valid", e, getLocator() );
}
return expressionClass;
}
/**
* Returns the handler for a child element.
*
* @param uri
* the URI of the namespace of the current 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 ( getUri().equals( uri ) == false ) {
return null;
}
if ( "property".equals( tagName ) ) {
final ExpressionPropertyReadHandler readHandler = new ExpressionPropertyReadHandler( beanInfo, getBundle() );
propertyHandlers.add( readHandler );
return readHandler;
}
return null;
}
/**
* Done parsing.
*
* @throws SAXException
* if there is a parsing error.
*/
protected void doneParsing() throws SAXException {
for ( int i = 0; i < propertyHandlers.size(); i++ ) {
final ExpressionPropertyReadHandler handler = propertyHandlers.get( i );
getBuilder().property( handler.getObject() );
}
}
/**
* Returns the object for this element or null, if this element does not create an object.
*
* @return the object.
* @throws SAXException
* if an parser error occured.
*/
public Object getObject() throws SAXException {
return new DefaultExpressionMetaData( getBuilder() );
}
}