OlapInput.java

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 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2013 by Pentaho : http://www.pentaho.com
 *
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 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.pentaho.di.trans.steps.olapinput;

import org.pentaho.di.core.exception.KettleDatabaseException;
import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.core.row.RowDataUtil;
import org.pentaho.di.trans.Trans;
import org.pentaho.di.trans.TransMeta;
import org.pentaho.di.trans.step.BaseStep;
import org.pentaho.di.trans.step.StepDataInterface;
import org.pentaho.di.trans.step.StepInterface;
import org.pentaho.di.trans.step.StepMeta;
import org.pentaho.di.trans.step.StepMetaInterface;

/**
 * Reads information from an OLAP datasource using MDX
 *
 * @author Paul Stoellberger
 * @since 11-MAR-2010
 */
public class OlapInput extends BaseStep implements StepInterface {
  private OlapInputMeta meta;
  private OlapData data;

  public OlapInput( StepMeta stepMeta, StepDataInterface stepDataInterface, int copyNr, TransMeta transMeta,
    Trans trans ) {
    super( stepMeta, stepDataInterface, copyNr, transMeta, trans );
  }

  public boolean processRow( StepMetaInterface smi, StepDataInterface sdi ) throws KettleException {
    try {

      if ( first ) { // we just got started

        first = false;
        meta.initData( this );

        data.rowNumber = 0;
      }

      for ( ; data.rowNumber < data.olapHelper.getRows().length; data.rowNumber++ ) {
        String[] row = data.olapHelper.getRows()[data.rowNumber];
        Object[] outputRowData = RowDataUtil.allocateRowData( row.length );
        outputRowData = row;

        putRow( data.outputRowMeta, outputRowData );

      }

      setOutputDone(); // signal end to receiver(s)
      return false; // end of data or error.

    } catch ( Exception e ) {
      logError( "An error occurred, processing will be stopped", e );
      setErrors( 1 );
      stopAll();
      return false;
    }
  }

  public void dispose( StepMetaInterface smi, StepDataInterface sdi ) {
    if ( log.isBasic() ) {
      logBasic( "Finished reading query, closing connection." );
    }

    try {
      data.olapHelper.close();
    } catch ( KettleDatabaseException e ) {
      logError( "Error closing connection: ", e );
    }

    super.dispose( smi, sdi );
  }

  public boolean init( StepMetaInterface smi, StepDataInterface sdi ) {
    meta = (OlapInputMeta) smi;
    data = (OlapData) sdi;

    if ( super.init( smi, sdi ) ) {
      return true;
    }

    return false;
  }

}