/*
* 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.parameters;
import java.util.HashMap;
import javax.swing.table.TableModel;
import org.pentaho.reporting.engine.classic.core.DataRow;
import org.pentaho.reporting.engine.classic.core.ReportProcessingException;
import org.pentaho.reporting.engine.classic.core.ResourceBundleFactory;
import org.pentaho.reporting.engine.classic.core.function.FormulaExpression;
import org.pentaho.reporting.engine.classic.core.util.IntegerCache;
import org.pentaho.reporting.libraries.base.config.Configuration;
import org.pentaho.reporting.libraries.base.util.ObjectUtilities;
import org.pentaho.reporting.libraries.base.util.StringUtils;
/**
* Todo: Document me!
*
* @author : Thomas Morgner
*/
public class ComputedParameterValues extends DefaultParameterValues
{
private static class TableDataRow implements DataRow
{
private TableModel data;
private int currentRow;
private String[] columnNames;
private HashMap nameindex;
private String valueColumn;
private Object value;
private TableDataRow(final TableModel data, final String valueColumn)
{
if (data == null)
{
throw new NullPointerException();
}
this.data = data;
this.columnNames = new String[data.getColumnCount()];
this.nameindex = new HashMap();
this.valueColumn = valueColumn;
for (int i = 0; i < columnNames.length; i++)
{
final String name = data.getColumnName(i);
columnNames[i] = name;
nameindex.put(name, IntegerCache.getInteger(i));
}
this.currentRow = -1;
}
public int getCurrentRow()
{
return currentRow;
}
public void setCurrentRow(final int currentRow)
{
if (currentRow < -1 || currentRow >= data.getRowCount())
{
throw new IndexOutOfBoundsException();
}
this.currentRow = currentRow;
}
/**
* Returns the value of the function, expression or column using its specific name. The given name is translated
* into a valid column number and the the column is queried. For functions and expressions, the
* <code>getValue()</code> method is called and for columns from the tablemodel the tablemodel method
* <code>getValueAt(row, column)</code> gets called.
*
* @param col the item index.
* @return the value.
*/
public Object get(final String col)
{
if (col == null)
{
throw new NullPointerException();
}
if (currentRow >= 0)
{
final Integer o = (Integer) nameindex.get(col);
if (o == null)
{
if (ObjectUtilities.equal(col, valueColumn))
{
return getValue();
}
return null;
}
return data.getValueAt(currentRow, o.intValue());
}
return null;
}
public String[] getColumnNames()
{
if (StringUtils.isEmpty(valueColumn))
{
return (String[]) columnNames.clone();
}
final String[] columnNames = new String[this.columnNames.length + 1];
System.arraycopy(this.columnNames, 0, columnNames, 0, this.columnNames.length);
columnNames[this.columnNames.length] = valueColumn;
return columnNames;
}
/**
* Checks whether the value contained in the column has changed since the last advance-operation.
*
* @param name the name of the column.
* @return true, if the value has changed, false otherwise.
*/
public boolean isChanged(final String name)
{
return false;
}
public TableModel getData()
{
return data;
}
public Object getValue()
{
return value;
}
public void setValue(final Object value)
{
this.value = value;
}
}
private static class ComputedParameterExpressionRuntime extends ParameterExpressionRuntime
{
private TableDataRow dataRow;
private ComputedParameterExpressionRuntime(final ParameterContext parameterContext,
final TableDataRow dataRow)
throws ReportProcessingException
{
super(parameterContext, dataRow);
this.dataRow = dataRow;
}
/**
* Returns the report configuration that was used to initiate this processing run.
*
* @return the report configuration.
*/
public Configuration getConfiguration()
{
return getProcessingContext().getConfiguration();
}
/**
* Returns the resource-bundle factory of current processing context.
*
* @return the current resource-bundle factory.
*/
public ResourceBundleFactory getResourceBundleFactory()
{
return getProcessingContext().getResourceBundleFactory();
}
/**
* Grants access to the tablemodel was granted using report properties, now direct.
*
* @return the current tablemodel used in the report.
*/
public TableModel getData()
{
return dataRow.getData();
}
/**
* Returns the number of the row in the tablemodel that is currently being processed.
*
* @return the current row number.
*/
public int getCurrentRow()
{
return dataRow.getCurrentRow();
}
public void setCurrentRow(final int currentRow)
{
this.dataRow.setCurrentRow(currentRow);
}
public Object getValue()
{
return dataRow.getValue();
}
public void setValue(final Object value)
{
dataRow.setValue(value);
}
}
private FormulaExpression formula;
private ComputedParameterExpressionRuntime expressionRuntime;
public ComputedParameterValues(final TableModel parent,
final String keyColumn,
final String valueColumn,
final String valueFormula,
final ParameterContext context) throws ReportProcessingException
{
super(parent, keyColumn, valueColumn);
if (valueFormula == null)
{
throw new NullPointerException();
}
if (context == null)
{
throw new NullPointerException();
}
this.expressionRuntime = new ComputedParameterExpressionRuntime(context, new TableDataRow(parent, valueColumn));
final FormulaExpression expression = new FormulaExpression();
expression.setFormula(valueFormula);
this.formula = expression;
}
public Object getTextValue(final int row)
{
expressionRuntime.setCurrentRow(row);
expressionRuntime.setValue(super.getTextValue(row));
formula.setRuntime(expressionRuntime);
try
{
return formula.getValue();
}
finally
{
formula.setRuntime(null);
}
}
}