/*! ******************************************************************************
*
* Pentaho Data Integration
*
* Copyright (C) 2002-2016 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
* limitations under the License.
*
******************************************************************************/
package org.pentaho.di.trans;
import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.core.exception.KettleStepException;
import org.pentaho.di.core.exception.KettleXMLException;
import org.pentaho.di.core.row.RowMetaInterface;
import org.pentaho.di.core.row.ValueMetaInterface;
import org.pentaho.di.core.util.Utils;
import org.pentaho.di.core.xml.XMLHandler;
import org.pentaho.di.repository.ObjectId;
import org.pentaho.di.repository.Repository;
import org.w3c.dom.Node;
public class ModPartitioner extends BasePartitioner {
private String fieldName;
protected int partitionColumnIndex = -1;
public ModPartitioner() {
super();
}
public Partitioner getInstance() {
Partitioner partitioner = new ModPartitioner();
partitioner.setId( getId() );
partitioner.setDescription( getDescription() );
return partitioner;
}
public ModPartitioner clone() {
ModPartitioner modPartitioner = (ModPartitioner) super.clone();
modPartitioner.fieldName = fieldName;
return modPartitioner;
}
public String getDialogClassName() {
return "org.pentaho.di.ui.trans.dialog.ModPartitionerDialog";
}
public int getPartition( RowMetaInterface rowMeta, Object[] row ) throws KettleException {
init( rowMeta );
if ( partitionColumnIndex < 0 ) {
partitionColumnIndex = rowMeta.indexOfValue( fieldName );
if ( partitionColumnIndex < 0 ) {
throw new KettleStepException( "Unable to find partitioning field name ["
+ fieldName + "] in the output row..." + rowMeta );
}
}
long value;
ValueMetaInterface valueMeta = rowMeta.getValueMeta( partitionColumnIndex );
Object valueData = row[partitionColumnIndex];
switch ( valueMeta.getType() ) {
case ValueMetaInterface.TYPE_INTEGER:
Long longValue = rowMeta.getInteger( row, partitionColumnIndex );
if ( longValue == null ) {
value = valueMeta.hashCode( valueData );
} else {
value = longValue.longValue();
}
break;
default:
value = valueMeta.hashCode( valueData );
}
/*
* value = rowMeta.getInteger(row, partitionColumnIndex);
*/
int targetLocation = (int) ( Math.abs( value ) % nrPartitions );
return targetLocation;
}
public String getDescription() {
String description = "Mod partitioner";
if ( !Utils.isEmpty( fieldName ) ) {
description += "(" + fieldName + ")";
}
return description;
}
public String getXML() {
StringBuilder xml = new StringBuilder( 150 );
xml.append( " " ).append( XMLHandler.addTagValue( "field_name", fieldName ) );
return xml.toString();
}
public void loadXML( Node partitioningMethodNode ) throws KettleXMLException {
fieldName = XMLHandler.getTagValue( partitioningMethodNode, "field_name" );
}
public void saveRep( Repository rep, ObjectId id_transformation, ObjectId id_step ) throws KettleException {
rep.saveStepAttribute( id_transformation, id_step, "PARTITIONING_FIELDNAME", fieldName ); // The fieldname to
// partition on
}
public void loadRep( Repository rep, ObjectId id_step ) throws KettleException {
fieldName = rep.getStepAttributeString( id_step, "PARTITIONING_FIELDNAME" );
}
public String getFieldName() {
return fieldName;
}
public void setFieldName( String fieldName ) {
this.fieldName = fieldName;
}
}