/**
* ========================================
* JFreeReport : a free Java report library
* ========================================
*
* Project Info: http://reporting.pentaho.org/
*
* (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library 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.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------
* $Id: RunningExpressionSlot.java 6659 2008-12-02 15:35:06Z tmorgner $
* ------------
* (C) Copyright 2000-2005, by Object Refinery Limited.
* (C) Copyright 2005-2007, by Pentaho Corporation.
*/
package org.jfree.report.data;
import org.jfree.report.DataRow;
import org.jfree.report.DataSourceException;
import org.jfree.report.ReportData;
import org.jfree.report.expressions.Expression;
import org.jfree.report.expressions.ExpressionRuntime;
import org.jfree.report.expressions.Function;
import org.jfree.report.flow.ReportContext;
import org.jfree.report.i18n.ResourceBundleFactory;
import org.pentaho.reporting.libraries.base.config.Configuration;
/**
* Creation-Date: 25.11.2006, 15:18:58
*
* @author Thomas Morgner
*/
public class RunningExpressionSlot
implements ExpressionSlot, ExpressionRuntime
{
private StaticExpressionRuntimeData staticRuntimeData;
private Expression expression;
private Object value;
private String name;
private boolean queried;
private DataRow dataRow;
public RunningExpressionSlot(final Expression expression,
final StaticExpressionRuntimeData runtimeData,
final PrecomputeNode precomputeNode)
{
this.staticRuntimeData = runtimeData;
this.expression = expression;
this.name = expression.getName();
this.expression.setRuntime(this);
this.expression.setRuntime(null);
}
public Expression getExpression()
{
return expression;
}
public Object getValue() throws DataSourceException
{
if (queried == false)
{
//noinspection SynchronizeOnNonFinalField
synchronized (expression)
{
expression.setRuntime(this);
value = expression.computeValue();
expression.setRuntime(null);
}
queried = true;
}
return value;
}
public String getName()
{
return name;
}
public DataRow getDataRow()
{
return dataRow;
}
public Object clone() throws CloneNotSupportedException
{
return super.clone();
}
public void updateDataRow(final DataRow dataRow)
{
this.dataRow = dataRow;
}
/**
* Returns the report data used in this section. If subreports are used, this
* does not reflect the complete report data.
* <p/>
* All access to the report data must be properly synchronized. Failure to do
* so may result in funny results. Do not assume that the report data will be
* initialized on the current cursor positon.
*
* @return
*/
public ReportData getData()
{
return staticRuntimeData.getData();
}
public Object getDeclaringParent()
{
return staticRuntimeData.getDeclaringParent();
}
public Configuration getConfiguration()
{
return staticRuntimeData.getConfiguration();
}
public ResourceBundleFactory getResourceBundleFactory()
{
return staticRuntimeData.getResourceBundleFactory();
}
public void advance() throws DataSourceException
{
if (expression instanceof Function)
{
Function f = (Function) expression;
expression.setRuntime(this);
expression = f.advance();
f.setRuntime(null);
expression.setRuntime(null);
}
value = null;
queried = false;
}
public boolean isDeepTraversing()
{
return expression.isDeepTraversing();
}
public int getCurrentRow()
{
return staticRuntimeData.getCurrentRow();
}
public ReportContext getReportContext()
{
return staticRuntimeData.getReportContext();
}
public boolean isPreserve()
{
return expression.isPreserve();
}
}