/*! ******************************************************************************
*
* Pentaho Data Integration
*
* Copyright (C) 2002-2013 by Pentaho : http://www.pentaho.com
*
*******************************************************************************
*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
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package org.pentaho.di.trans.steps.rules;
import java.util.Arrays;
import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.core.exception.KettleStepException;
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;
import org.pentaho.di.trans.steps.rules.Rules.Column;
/**
* This Transformation Step allows a user to execute a rule set against an individual rule or a collection of rules.
*
* Additional columns can be added to the output from the rules and these (of course) can be used for routing if
* desired.
*
* @author cboyden
*
*/
public class RulesExecutor extends BaseStep implements StepInterface {
// private static Class<?> PKG = Rules.class; // for i18n purposes
private RulesExecutorMeta meta;
private RulesExecutorData data;
public RulesExecutor( StepMeta stepMeta, StepDataInterface stepDataInterface, int copyNr, TransMeta transMeta,
Trans trans ) {
super( stepMeta, stepDataInterface, copyNr, transMeta, trans );
}
public boolean init( StepMetaInterface smi, StepDataInterface sdi ) {
meta = (RulesExecutorMeta) smi;
data = (RulesExecutorData) sdi;
if ( super.init( smi, sdi ) ) {
return true;
}
return false;
}
public boolean runtimeInit() throws KettleStepException {
data.setOutputRowMeta( getInputRowMeta().clone() );
meta.getFields( data.getOutputRowMeta(), getStepname(), null, null, this, repository, metaStore );
data.setRuleFilePath( meta.getRuleFile() );
data.setRuleString( meta.getRuleDefinition() );
data.initializeRules();
data.initializeColumns( getInputRowMeta() );
return true;
}
public void dispose( StepMetaInterface smi, StepDataInterface sdi ) {
meta = (RulesExecutorMeta) smi;
data = (RulesExecutorData) sdi;
super.dispose( smi, sdi );
}
public boolean processRow( StepMetaInterface smi, StepDataInterface sdi ) throws KettleException {
meta = (RulesExecutorMeta) smi;
data = (RulesExecutorData) sdi;
Object[] r = getRow(); // get row, set busy!
if ( r == null ) { // no more input to be expected...
data.shutdown();
setOutputDone();
return false;
}
if ( first ) {
if ( !runtimeInit() ) {
return false;
}
first = false;
}
// Load the column objects
data.loadRow( r );
data.execute();
Object[] outputRow;
int beginOutputRowFill = 0;
String[] expectedResults = meta.getExpectedResultList();
if ( meta.isKeepInputFields() ) {
int inputRowSize = getInputRowMeta().size();
outputRow = Arrays.copyOf( r, inputRowSize + expectedResults.length );
beginOutputRowFill = inputRowSize;
} else {
outputRow = new Object[expectedResults.length];
}
Column result = null;
for ( int i = 0; i < expectedResults.length; i++ ) {
result = (Column) data.fetchResult( expectedResults[i] );
outputRow[i + beginOutputRowFill] = result == null ? null : result.getPayload();
}
putRow( data.getOutputRowMeta(), outputRow );
return true;
}
}