/*
* 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 - 2009 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.modules.parser.extwriter;
import java.io.IOException;
import java.util.Iterator;
import org.pentaho.reporting.engine.classic.core.modules.parser.ext.ExtParserModule;
import org.pentaho.reporting.engine.classic.core.modules.parser.ext.factory.templates.TemplateDescription;
import org.pentaho.reporting.libraries.base.util.ObjectUtilities;
import org.pentaho.reporting.libraries.xmlns.common.AttributeList;
import org.pentaho.reporting.libraries.xmlns.writer.XmlWriter;
import org.pentaho.reporting.libraries.xmlns.writer.XmlWriterSupport;
/**
* The template writer writes a single template definition to the xml-definition stream. This writer requires report
* builder hints to be present for all templates.
*
* @author Thomas Morgner
*/
public class TemplateWriter extends ObjectWriter
{
/**
* The template that should be written.
*/
private TemplateDescription template;
/**
* The parent of the current template.
*/
private TemplateDescription parent;
/**
* Creates a new template writer.
*
* @param reportWriter the report writer that is used to coordinate the writing.
* @param indentLevel the current indention level.
* @param template the template that should be written.
* @param parent the parent of the template.
*/
public TemplateWriter(final ReportWriterContext reportWriter,
final XmlWriter indentLevel,
final TemplateDescription template,
final TemplateDescription parent)
{
super(reportWriter, template, indentLevel);
if (template == null)
{
throw new NullPointerException("Template is null.");
}
if (parent == null)
{
throw new NullPointerException("Parent is null.");
}
this.parent = parent;
this.template = template;
}
/**
* Writes the report definition portion. Every DefinitionWriter handles one or more elements of the JFreeReport object
* tree, DefinitionWriter traverse the object tree and write the known objects or forward objects to other definition
* writers.
*
* @throws java.io.IOException if there is an I/O problem.
* @throws ReportWriterException if the report serialisation failed.
*/
public void write()
throws IOException, ReportWriterException
{
final AttributeList attList = new AttributeList();
if (template.getName() != null)
{
// dont copy the parent name for anonymous templates ...
if (template.getName().equals(parent.getName()) == false)
{
attList.setAttribute(ExtParserModule.NAMESPACE, "name", template.getName());
}
}
attList.setAttribute(ExtParserModule.NAMESPACE, "references", parent.getName());
boolean tagWritten = false;
final XmlWriter writer = getXmlWriter();
final Iterator it = template.getParameterNames();
while (it.hasNext())
{
final String name = (String) it.next();
if (shouldWriteParameter(name))
{
if (tagWritten == false)
{
writer.writeTag(ExtParserModule.NAMESPACE, AbstractXMLDefinitionWriter.TEMPLATE_TAG, attList,
XmlWriterSupport.OPEN);
tagWritten = true;
}
writeParameter(name);
}
}
if (tagWritten)
{
writer.writeCloseTag();
}
else
{
writer.writeTag
(ExtParserModule.NAMESPACE, AbstractXMLDefinitionWriter.TEMPLATE_TAG, attList, XmlWriterSupport.CLOSE);
}
}
/**
* Tests, whether the given parameter should be written in this template. This will return false, if the parameter is
* not set, or the parent contains the same value.
*
* @param parameterName the name of the parameter that should be tested
* @return true, if the parameter should be written, false otherwise.
*/
private boolean shouldWriteParameter(final String parameterName)
{
final Object parameterObject = template.getParameter(parameterName);
if (parameterObject == null)
{
//Log.debug ("Should not write: Parameter is null.");
return false;
}
final Object parentObject = parent.getParameter(parameterName);
if (ObjectUtilities.equal(parameterObject, parentObject))
{
//Log.debug ("Should not write: Parameter objects are equal.");
return false;
}
return true;
}
}