/*
* ============================================================================
* GNU Lesser General Public License
* ============================================================================
*
* JasperReports - Free Java report-generating library.
* Copyright (C) 2001-2005 Teodor Danciu teodord@users.sourceforge.net
*
* 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.
*
* Teodor Danciu
* 173, Calea Calarasilor, Bl. 42, Sc. 1, Ap. 18
* Postal code 030615, Sector 3
* Bucharest, ROMANIA
* Email: teodord@users.sourceforge.net
*/
package net.sf.jasperreports.compilers;
import java.io.IOException;
import java.io.LineNumberReader;
import java.io.StringReader;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExpression;
import net.sf.jasperreports.engine.fill.JRCalculator;
import bsh.EvalError;
import bsh.Interpreter;
import bsh.TargetError;
/**
* @author Teodor Danciu (teodord@users.sourceforge.net)
* @version $Id: JRBshCalculator.java,v 1.1 2005/05/23 08:26:24 sherifo Exp $
*/
public class JRBshCalculator extends JRCalculator
{
/**
*
*/
private String bshScript = null;
private Interpreter interpreter = null;
/**
*
*/
public JRBshCalculator(String bshScript) throws JRException
{
super();
this.bshScript = bshScript;
interpreter = new Interpreter();
interpreter.setClassLoader(Thread.currentThread().getContextClassLoader());
try
{
interpreter.eval(new StringReader(bshScript));
}
catch(EvalError e)
{
throw new JRException(
"Error evaluating report expressions BeanShell script."
+ "\nMessage : " + e.getMessage()
+ "\nLine " + e.getErrorLineNumber() + " : " + extractLineContent(e)
);
}
}
/**
*
*/
public void verify(Collection expressions) throws JRException
{
try
{
interpreter.eval("bshCalculator = createBshCalculator()");
if (expressions != null)
{
for(Iterator it = expressions.iterator(); it.hasNext();)
{
JRExpression expression = (JRExpression)it.next();
interpreter.eval("bshCalculator.evaluateOld(" + expression.getId() + ")");
}
}
}
catch(TargetError te)
{
//ignore
}
catch(EvalError e)
{
throw new JRException(
"Error testing report expressions BeanShell script."
+ "\nMessage : " + e.getMessage()
+ "\nLine " + e.getErrorLineNumber() + " : " + extractLineContent(e)
);
}
}
/**
*
*/
protected void customizedInit(
Map pars,
Map fldsm,
Map varsm
) throws JRException
{
try
{
interpreter.set("calculator", this);
interpreter.set("fldsm", fldsm);
interpreter.set("varsm", varsm);
interpreter.set("parsm", pars);
interpreter.eval("bshCalculator = createBshCalculator()");
interpreter.eval("bshCalculator.init(calculator, parsm, fldsm, varsm)");
}
catch(EvalError e)
{
throw new JRException("Error initializing report BeanShell calculator.", e);
}
}
/**
*
*/
protected Object evaluateOld(int id) throws Throwable
{
try
{
return interpreter.eval("bshCalculator.evaluateOld(" + id + ")");
}
catch(TargetError te)
{
throw te.getTarget();
}
catch(EvalError ee)
{
throw ee;
}
}
/**
*
*/
protected Object evaluateEstimated(int id) throws Throwable
{
try
{
return interpreter.eval("bshCalculator.evaluateEstimated(" + id + ")");
}
catch(TargetError te)
{
throw te.getTarget();
}
catch(EvalError ee)
{
throw ee;
}
}
/**
*
*/
protected Object evaluate(int id) throws Throwable
{
try
{
return interpreter.eval("bshCalculator.evaluate(" + id + ")");
}
catch(TargetError te)
{
throw te.getTarget();
}
catch(EvalError ee)
{
throw ee;
}
}
/**
*
*/
private String extractLineContent(EvalError e)
{
String lineContent = "";
LineNumberReader reader = null;
try
{
reader = new LineNumberReader(new StringReader(bshScript));
int lineNumber = e.getErrorLineNumber();
for(int i = 0; i < lineNumber; i++)
{
lineContent = reader.readLine();
}
}
catch(IOException ioe)
{
}
finally
{
if (reader != null)
{
try
{
reader.close();
}
catch(IOException ioe)
{
}
}
}
return lineContent;
}
}