Package org.pentaho.reporting.engine.classic.extensions.drilldown

Source Code of org.pentaho.reporting.engine.classic.extensions.drilldown.DrillDownFunction

package org.pentaho.reporting.engine.classic.extensions.drilldown;

import java.util.Collection;

import org.pentaho.reporting.libraries.formula.EvaluationException;
import org.pentaho.reporting.libraries.formula.FormulaContext;
import org.pentaho.reporting.libraries.formula.LibFormulaErrorValue;
import org.pentaho.reporting.libraries.formula.function.Function;
import org.pentaho.reporting.libraries.formula.function.ParameterCallback;
import org.pentaho.reporting.libraries.formula.lvalues.TypeValuePair;
import org.pentaho.reporting.libraries.formula.typing.ArrayCallback;
import org.pentaho.reporting.libraries.formula.typing.Sequence;
import org.pentaho.reporting.libraries.formula.typing.TypeRegistry;
import org.pentaho.reporting.libraries.formula.typing.TypeUtil;
import org.pentaho.reporting.libraries.formula.typing.coretypes.TextType;

/**
* Todo: Document me!
* <p/>
* Date: 08.02.2010
* Time: 18:11:43
*
* @author Thomas Morgner.
*/
public class DrillDownFunction implements Function
{
  public DrillDownFunction()
  {
  }

  public String getCanonicalName()
  {
    return "DRILLDOWN";
  }

  public TypeValuePair evaluate(final FormulaContext context,
                                final ParameterCallback parameters) throws EvaluationException
  {
    if (parameters.getParameterCount() != 3)
    {
      throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
    }

    // 0: Configuration-indicator (gives the pattern indirectly) never the pattern itself
    // 1: the report-path
    // 2: the parameter as 2d-array (name value pairs)

    final TypeRegistry typeRegistry = context.getTypeRegistry();
    final String configIndicator = typeRegistry.convertToText(parameters.getType(0), parameters.getValue(0));
    String path;
    try
    {
      path = typeRegistry.convertToText(parameters.getType(1), parameters.getValue(1));
    }
    catch (EvaluationException ee)
    {
      if (LibFormulaErrorValue.ERROR_NA_VALUE.equals(ee.getErrorValue()))
      {
        path = null;
      }
      else
      {
        throw ee;
      }
    }
    final ArrayCallback parameter = typeRegistry.convertToArray(parameters.getType(2), parameters.getValue(2));

    final LinkCustomizer pattern = createLinkCustomizer(configIndicator);
    return new TypeValuePair(TextType.TYPE, pattern.format(context, configIndicator, path,
        computeParameterEntries(parameter, typeRegistry)));
  }

  private ParameterEntry[] computeParameterEntries(final ArrayCallback paraCallback,
                                                   final TypeRegistry typeRegistry) throws EvaluationException
  {
    if (paraCallback.getColumnCount() == 0)
    {
      return new ParameterEntry[0];
    }
    if (paraCallback.getColumnCount() != 2)
    {
      throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
    }

    final int rowCount = paraCallback.getRowCount();
    final ParameterEntry[] retval = new ParameterEntry[rowCount];
    for (int r = 0; r < rowCount; r++)
    {
      final String name = typeRegistry.convertToText(paraCallback.getType(r, 0), paraCallback.getValue(r, 0));
      try
      {
        final Object value = paraCallback.getValue(r, 1);
        if (value instanceof ArrayCallback)
        {
          retval[r] = new ParameterEntry(name, TypeUtil.normalize((ArrayCallback) value));
        }
        else if (value instanceof Sequence)
        {
          retval[r] = new ParameterEntry(name, TypeUtil.normalize((Sequence) value));
        }
        else if (value instanceof Collection)
        {
          final Collection c = (Collection) value;
          retval[r] = new ParameterEntry(name, c.toArray());
        }
        else
        {
          retval[r] = new ParameterEntry(name, value);
        }
      }
      catch (EvaluationException ee)
      {
        if (ee.getErrorValue() == LibFormulaErrorValue.ERROR_NA_VALUE)
        {
          retval[r] = new ParameterEntry(name, null);
        }
        else
        {
          throw ee;
        }
      }
    }
    return retval;
  }

  private LinkCustomizer createLinkCustomizer(final String configIndicator) throws EvaluationException
  {
    final DrillDownProfile downProfile = DrillDownProfileMetaData.getInstance().getDrillDownProfile(configIndicator);
    if (downProfile == null)
    {
      throw new EvaluationException(LibFormulaErrorValue.ERROR_UNEXPECTED_VALUE);
    }
    try
    {
      return (LinkCustomizer) downProfile.getLinkCustomizerType().newInstance();
    }
    catch (InstantiationException e)
    {
      throw new EvaluationException(LibFormulaErrorValue.ERROR_UNEXPECTED_VALUE);
    }
    catch (IllegalAccessException e)
    {
      throw new EvaluationException(LibFormulaErrorValue.ERROR_UNEXPECTED_VALUE);
    }
  }
}
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