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*
* 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.prioritizestreams;
import java.util.List;
import org.pentaho.di.core.CheckResult;
import org.pentaho.di.core.CheckResultInterface;
import org.pentaho.di.core.Const;
import org.pentaho.di.core.database.DatabaseMeta;
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.variables.VariableSpace;
import org.pentaho.di.core.xml.XMLHandler;
import org.pentaho.di.i18n.BaseMessages;
import org.pentaho.di.repository.ObjectId;
import org.pentaho.di.repository.Repository;
import org.pentaho.di.shared.SharedObjectInterface;
import org.pentaho.di.trans.Trans;
import org.pentaho.di.trans.TransMeta;
import org.pentaho.di.trans.step.BaseStepMeta;
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.metastore.api.IMetaStore;
import org.w3c.dom.Node;
/*
* Created on 30-06-2008
*
*/
public class PrioritizeStreamsMeta extends BaseStepMeta implements StepMetaInterface {
private static Class<?> PKG = PrioritizeStreamsMeta.class; // for i18n purposes, needed by Translator2!!
/** by which steps to display? */
private String[] stepName;
public PrioritizeStreamsMeta() {
super(); // allocate BaseStepMeta
}
public void loadXML( Node stepnode, List<DatabaseMeta> databases, IMetaStore metaStore ) throws KettleXMLException {
readData( stepnode, databases );
}
public Object clone() {
PrioritizeStreamsMeta retval = (PrioritizeStreamsMeta) super.clone();
int nrfields = stepName.length;
retval.allocate( nrfields );
System.arraycopy( stepName, 0, retval.stepName, 0, nrfields );
return retval;
}
public void allocate( int nrfields ) {
stepName = new String[nrfields];
}
/**
* @return Returns the stepName.
*/
public String[] getStepName() {
return stepName;
}
/**
* @param stepName
* The stepName to set.
*/
public void setStepName( String[] stepName ) {
this.stepName = stepName;
}
public void getFields( RowMetaInterface rowMeta, String origin, RowMetaInterface[] info, StepMeta nextStep,
VariableSpace space, Repository repository, IMetaStore metaStore ) throws KettleStepException {
// Default: nothing changes to rowMeta
}
private void readData( Node stepnode, List<? extends SharedObjectInterface> databases ) throws KettleXMLException {
try {
Node steps = XMLHandler.getSubNode( stepnode, "steps" );
int nrsteps = XMLHandler.countNodes( steps, "step" );
allocate( nrsteps );
for ( int i = 0; i < nrsteps; i++ ) {
Node fnode = XMLHandler.getSubNodeByNr( steps, "step", i );
stepName[i] = XMLHandler.getTagValue( fnode, "name" );
}
} catch ( Exception e ) {
throw new KettleXMLException( "Unable to load step info from XML", e );
}
}
public String getXML() {
StringBuilder retval = new StringBuilder();
retval.append( " <steps>" + Const.CR );
for ( int i = 0; i < stepName.length; i++ ) {
retval.append( " <step>" + Const.CR );
retval.append( " " + XMLHandler.addTagValue( "name", stepName[i] ) );
retval.append( " </step>" + Const.CR );
}
retval.append( " </steps>" + Const.CR );
return retval.toString();
}
public void setDefault() {
int nrsteps = 0;
allocate( nrsteps );
for ( int i = 0; i < nrsteps; i++ ) {
stepName[i] = "step" + i;
}
}
public void readRep( Repository rep, IMetaStore metaStore, ObjectId id_step, List<DatabaseMeta> databases ) throws KettleException {
try {
int nrsteps = rep.countNrStepAttributes( id_step, "step_name" );
allocate( nrsteps );
for ( int i = 0; i < nrsteps; i++ ) {
stepName[i] = rep.getStepAttributeString( id_step, i, "step_name" );
}
} catch ( Exception e ) {
throw new KettleException( "Unexpected error reading step information from the repository", e );
}
}
public void saveRep( Repository rep, IMetaStore metaStore, ObjectId id_transformation, ObjectId id_step ) throws KettleException {
try {
for ( int i = 0; i < stepName.length; i++ ) {
rep.saveStepAttribute( id_transformation, id_step, i, "step_name", stepName[i] );
}
} catch ( Exception e ) {
throw new KettleException( "Unable to save step information to the repository for id_step=" + id_step, e );
}
}
public void check( List<CheckResultInterface> remarks, TransMeta transMeta, StepMeta stepMeta,
RowMetaInterface prev, String[] input, String[] output, RowMetaInterface info, VariableSpace space,
Repository repository, IMetaStore metaStore ) {
CheckResult cr;
if ( prev == null || prev.size() == 0 ) {
cr =
new CheckResult( CheckResult.TYPE_RESULT_WARNING, BaseMessages.getString(
PKG, "PrioritizeStreamsMeta.CheckResult.NotReceivingFields" ), stepMeta );
remarks.add( cr );
} else {
if ( stepName.length > 0 ) {
cr =
new CheckResult( CheckResult.TYPE_RESULT_OK, BaseMessages.getString(
PKG, "PrioritizeStreamsMeta.CheckResult.AllStepsFound" ), stepMeta );
remarks.add( cr );
} else {
cr =
new CheckResult( CheckResult.TYPE_RESULT_WARNING, BaseMessages.getString(
PKG, "PrioritizeStreamsMeta.CheckResult.NoStepsEntered" ), stepMeta );
remarks.add( cr );
}
}
// See if we have input streams leading to this step!
if ( input.length > 0 ) {
cr =
new CheckResult( CheckResult.TYPE_RESULT_OK, BaseMessages.getString(
PKG, "PrioritizeStreamsMeta.CheckResult.StepRecevingData2" ), stepMeta );
remarks.add( cr );
} else {
cr =
new CheckResult( CheckResult.TYPE_RESULT_ERROR, BaseMessages.getString(
PKG, "PrioritizeStreamsMeta.CheckResult.NoInputReceivedFromOtherSteps" ), stepMeta );
remarks.add( cr );
}
}
public StepInterface getStep( StepMeta stepMeta, StepDataInterface stepDataInterface, int cnr, TransMeta tr,
Trans trans ) {
return new PrioritizeStreams( stepMeta, stepDataInterface, cnr, tr, trans );
}
public StepDataInterface getStepData() {
return new PrioritizeStreamsData();
}
}