Package net.sf.jasperreports.compilers

Source Code of net.sf.jasperreports.compilers.JRBshEvaluator

/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2009 Jaspersoft Corporation. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports 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 3 of the License, or
* (at your option) any later version.
*
* JasperReports 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 JasperReports. If not, see <http://www.gnu.org/licenses/>.
*/
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.JREvaluator;
import bsh.EvalError;
import bsh.Interpreter;
import bsh.TargetError;


/**
* @author Teodor Danciu (teodord@users.sourceforge.net)
* @version $Id: JRBshEvaluator.java 3939 2010-08-20 09:52:00Z teodord $
*/
public class JRBshEvaluator extends JREvaluator
{


  /**
   *
   */
  private String bshScript;
  private Interpreter interpreter;


  /**
   *
   */
  public JRBshEvaluator(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("bshEvaluator = createBshEvaluator()");
     
      if (expressions != null)
      {
        for(Iterator it = expressions.iterator(); it.hasNext();)
        {
          JRExpression expression = (JRExpression)it.next();
          interpreter.eval("bshEvaluator.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("bshEvaluator = createBshEvaluator()");
      interpreter.eval("bshEvaluator.init(calculator, parsm, fldsm, varsm)");
    }
    catch(EvalError e)
    {
      throw new JRException("Error initializing report BeanShell calculator.", e);
    }
  }


  /**
   *
   */
  protected Object evaluateOld(int id) throws Throwable //NOSONAR
  {
    try
    {
      return interpreter.eval("bshEvaluator.evaluateOld(" + id + ")");
    }
    catch(TargetError te)
    {
      throw te.getTarget();
    }
    catch(EvalError ee)
    {
      throw ee;
    }
  }


  /**
   *
   */
  protected Object evaluateEstimated(int id) throws Throwable //NOSONAR
  {
    try
    {
      return interpreter.eval("bshEvaluator.evaluateEstimated(" + id + ")");
    }
    catch(TargetError te)
    {
      throw te.getTarget();
    }
    catch(EvalError ee)
    {
      throw ee;
    }
  }


  /**
   *
   */
  protected Object evaluate(int id) throws Throwable //NOSONAR
  {
    try
    {
      return interpreter.eval("bshEvaluator.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;
  }


}
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