FlattenerDialog.java

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 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2016 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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 * 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.ui.trans.steps.flattener;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CCombo;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.ShellAdapter;
import org.eclipse.swt.events.ShellEvent;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.swt.widgets.Text;
import org.pentaho.di.core.Const;
import org.pentaho.di.core.util.Utils;
import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.core.row.RowMetaInterface;
import org.pentaho.di.i18n.BaseMessages;
import org.pentaho.di.trans.TransMeta;
import org.pentaho.di.trans.step.BaseStepMeta;
import org.pentaho.di.trans.step.StepDialogInterface;
import org.pentaho.di.trans.steps.flattener.FlattenerMeta;
import org.pentaho.di.ui.core.dialog.ErrorDialog;
import org.pentaho.di.ui.core.widget.ColumnInfo;
import org.pentaho.di.ui.core.widget.TableView;
import org.pentaho.di.ui.trans.step.BaseStepDialog;

public class FlattenerDialog extends BaseStepDialog implements StepDialogInterface {
  private static Class<?> PKG = FlattenerMeta.class; // for i18n purposes, needed by Translator2!!

  private Label wlFields;
  private TableView wFields;
  private FormData fdlFields, fdFields;

  private Label wlField;
  private CCombo wField;
  private FormData fdlField, fdField;

  private boolean gotPreviousFields = false;

  private FlattenerMeta input;

  public FlattenerDialog( Shell parent, Object in, TransMeta transMeta, String sname ) {
    super( parent, (BaseStepMeta) in, transMeta, sname );
    input = (FlattenerMeta) in;
  }

  public String open() {
    Shell parent = getParent();
    Display display = parent.getDisplay();

    shell = new Shell( parent, SWT.DIALOG_TRIM | SWT.RESIZE | SWT.MAX | SWT.MIN );
    props.setLook( shell );
    setShellImage( shell, input );

    ModifyListener lsMod = new ModifyListener() {
      public void modifyText( ModifyEvent e ) {
        input.setChanged();
      }
    };
    backupChanged = input.hasChanged();

    FormLayout formLayout = new FormLayout();
    formLayout.marginWidth = Const.FORM_MARGIN;
    formLayout.marginHeight = Const.FORM_MARGIN;

    shell.setLayout( formLayout );
    shell.setText( BaseMessages.getString( PKG, "FlattenerDialog.Shell.Title" ) );

    int middle = props.getMiddlePct();
    int margin = Const.MARGIN;

    // Stepname line
    wlStepname = new Label( shell, SWT.RIGHT );
    wlStepname.setText( BaseMessages.getString( PKG, "FlattenerDialog.Stepname.Label" ) );
    props.setLook( wlStepname );
    fdlStepname = new FormData();
    fdlStepname.left = new FormAttachment( 0, 0 );
    fdlStepname.right = new FormAttachment( middle, -margin );
    fdlStepname.top = new FormAttachment( 0, margin );
    wlStepname.setLayoutData( fdlStepname );
    wStepname = new Text( shell, SWT.SINGLE | SWT.LEFT | SWT.BORDER );
    wStepname.setText( stepname );
    props.setLook( wStepname );
    wStepname.addModifyListener( lsMod );
    fdStepname = new FormData();
    fdStepname.left = new FormAttachment( middle, 0 );
    fdStepname.top = new FormAttachment( 0, margin );
    fdStepname.right = new FormAttachment( 100, 0 );
    wStepname.setLayoutData( fdStepname );

    // Key field...
    wlField = new Label( shell, SWT.RIGHT );
    wlField.setText( BaseMessages.getString( PKG, "FlattenerDialog.FlattenField.Label" ) );
    props.setLook( wlField );
    fdlField = new FormData();
    fdlField.left = new FormAttachment( 0, 0 );
    fdlField.right = new FormAttachment( middle, -margin );
    fdlField.top = new FormAttachment( wStepname, margin );
    wlField.setLayoutData( fdlField );
    wField = new CCombo( shell, SWT.BORDER | SWT.READ_ONLY );
    props.setLook( wField );
    wField.addModifyListener( lsMod );
    fdField = new FormData();
    fdField.left = new FormAttachment( middle, 0 );
    fdField.top = new FormAttachment( wStepname, margin );
    fdField.right = new FormAttachment( 100, 0 );
    wField.setLayoutData( fdField );
    wField.addFocusListener( new FocusListener() {
      public void focusLost( org.eclipse.swt.events.FocusEvent e ) {
      }

      public void focusGained( org.eclipse.swt.events.FocusEvent e ) {
        Cursor busy = new Cursor( shell.getDisplay(), SWT.CURSOR_WAIT );
        shell.setCursor( busy );
        getFields();
        shell.setCursor( null );
        busy.dispose();
      }
    } );

    wlFields = new Label( shell, SWT.NONE );
    wlFields.setText( BaseMessages.getString( PKG, "FlattenerDialog.TargetField.Label" ) );
    props.setLook( wlFields );
    fdlFields = new FormData();
    fdlFields.left = new FormAttachment( 0, 0 );
    fdlFields.top = new FormAttachment( wField, margin );
    wlFields.setLayoutData( fdlFields );

    int nrKeyCols = 1;
    int nrKeyRows = ( input.getTargetField() != null ? input.getTargetField().length : 1 );

    ColumnInfo[] ciKey = new ColumnInfo[nrKeyCols];
    ciKey[0] =
      new ColumnInfo(
        BaseMessages.getString( PKG, "FlattenerDialog.ColumnInfo.TargetField" ), ColumnInfo.COLUMN_TYPE_TEXT,
        false );

    wFields =
      new TableView(
        transMeta, shell, SWT.BORDER | SWT.FULL_SELECTION | SWT.MULTI | SWT.V_SCROLL | SWT.H_SCROLL, ciKey,
        nrKeyRows, lsMod, props );

    fdFields = new FormData();
    fdFields.left = new FormAttachment( 0, 0 );
    fdFields.top = new FormAttachment( wlFields, margin );
    fdFields.right = new FormAttachment( 100, -margin );
    fdFields.bottom = new FormAttachment( 100, -50 );
    wFields.setLayoutData( fdFields );

    // THE BUTTONS
    wOK = new Button( shell, SWT.PUSH );
    wOK.setText( BaseMessages.getString( PKG, "System.Button.OK" ) );
    wCancel = new Button( shell, SWT.PUSH );
    wCancel.setText( BaseMessages.getString( PKG, "System.Button.Cancel" ) );

    setButtonPositions( new Button[] { wOK, wCancel }, margin, null );

    // Add listeners
    lsOK = new Listener() {
      public void handleEvent( Event e ) {
        ok();
      }
    };
    lsCancel = new Listener() {
      public void handleEvent( Event e ) {
        cancel();
      }
    };

    wOK.addListener( SWT.Selection, lsOK );
    wCancel.addListener( SWT.Selection, lsCancel );

    lsDef = new SelectionAdapter() {
      public void widgetDefaultSelected( SelectionEvent e ) {
        ok();
      }
    };

    wStepname.addSelectionListener( lsDef );

    // Detect X or ALT-F4 or something that kills this window...
    shell.addShellListener( new ShellAdapter() {
      public void shellClosed( ShellEvent e ) {
        cancel();
      }
    } );

    // Set the shell size, based upon previous time...
    setSize();

    getData();
    input.setChanged( backupChanged );

    shell.open();
    while ( !shell.isDisposed() ) {
      if ( !display.readAndDispatch() ) {
        display.sleep();
      }
    }
    return stepname;
  }

  private void getFields() {
    if ( !gotPreviousFields ) {
      try {
        String field = wField.getText();
        RowMetaInterface r = transMeta.getPrevStepFields( stepname );
        if ( r != null ) {
          wField.setItems( r.getFieldNames() );
        }
        if ( field != null ) {
          wField.setText( field );
        }
      } catch ( KettleException ke ) {
        new ErrorDialog(
          shell, BaseMessages.getString( PKG, "FlattenerDialog.FailedToGetFields.DialogTitle" ), BaseMessages
            .getString( PKG, "FlattenerDialog.FailedToGetFields.DialogMessage" ), ke );
      }
      gotPreviousFields = true;
    }
  }

  /**
   * Copy information from the meta-data input to the dialog fields.
   */
  public void getData() {
    if ( log.isDebug() ) {
      logDebug( BaseMessages.getString( PKG, "FlattenerDialog.Log.GettingKeyInfo" ) );
    }

    if ( input.getFieldName() != null ) {
      wField.setText( input.getFieldName() );
    }

    if ( input.getTargetField() != null ) {
      for ( int i = 0; i < input.getTargetField().length; i++ ) {
        TableItem item = wFields.table.getItem( i );
        if ( input.getTargetField()[i] != null ) {
          item.setText( 1, input.getTargetField()[i] );
        }
      }
    }

    wFields.setRowNums();
    wFields.optWidth( true );

    wStepname.selectAll();
    wStepname.setFocus();
  }

  private void cancel() {
    stepname = null;
    dispose();
  }

  private void ok() {
    if ( Utils.isEmpty( wStepname.getText() ) ) {
      return;
    }

    int nrTargets = wFields.nrNonEmpty();

    input.setFieldName( wField.getText() );

    input.allocate( nrTargets );

    for ( int i = 0; i < nrTargets; i++ ) {
      TableItem item = wFields.getNonEmpty( i );
      //CHECKSTYLE:Indentation:OFF
      input.getTargetField()[i] = item.getText( 1 );
    }
    stepname = wStepname.getText();

    dispose();
  }
}