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/*
 * Copyright (C) 2014-2018 D3X Systems - All Rights Reserved
 *
 * 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 com.d3x.morpheus.viz.table;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.TableColumnModelEvent;
import javax.swing.event.TableColumnModelListener;
import javax.swing.table.DefaultTableColumnModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;

import com.d3x.morpheus.frame.DataFrame;
import com.d3x.morpheus.index.Index;

/**
 * A Swing GUI component that displays a DataFrame in a standard JTable with additional functionality.
 *
 * @author Xavier Witdouck
 *
 * 

This is open source software released under the Apache 2.0 License

*/ public class DataFrameTable extends javax.swing.JPanel { private static final Logger LOG = Logger.getLogger(DataFrameTable.class.getName()); private static Map fontStyleNameMap = new LinkedHashMap<>(); private static Map fontStyleIconMap = new LinkedHashMap<>(); private static Map alignmentNameMap = new LinkedHashMap<>(); private static Map alignmentIconMap = new LinkedHashMap<>(); private static Map formatNameMap = new LinkedHashMap<>(); private static Map formatIconMap = new LinkedHashMap<>(); private int decimalCount = 4; private JScrollPane scrollPane; private JTable leftTable = new JTable(); private JTable rightTable = new JTable(); private DataFrameCellEditor editor = new DataFrameCellEditor(); private DataFrameTableModel model = new DataFrameTableModel(); private DataFrameCellRenderer renderer = new DataFrameCellRenderer(this); private DataFrameCellFormat defaultCellFormat = new DataFrameCellFormat(); private ListSelectionModel selectionModel = new DefaultListSelectionModel(); private TableRowSorter sorter = new TableRowSorter<>(model); private Map formatMap = new HashMap<>(); private Index rowIndex = Index.of(Object.class, 2000); private Index colIndex = Index.of(Object.class, 100); private DataFrame formatFrame = DataFrame.ofObjects(rowIndex, colIndex); private JPopupMenu popupMenu = new JPopupMenu(); private JMenu fontMenu = new JMenu("Font..."); private JMenu styleMenu = new JMenu("Style...."); private JMenu dateFormatMenu = new JMenu("Date Format..."); private JMenu decimalFormatMenu = new JMenu("Number Format..."); private JMenu alignmentMenu = new JMenu("Alignment..."); private Action bestFitAction = createBestFitAction(); private Action exportCsvAction = createCsvExportAction(); private Action backgroundAction = createFillColorAction(); private Action foregroundAction = createFontColorAction(); private Action increasePrecisionAction = createIncreasePrecisionAction(); private Action decreasePrecisionAction = createDecreasePrecisionAction(); private TableColumnModelListener columnModelListener = new TableColumnModelListener() { public void columnAdded(TableColumnModelEvent e) { resizeLeftTable(); } public void columnMarginChanged(ChangeEvent e) { resizeLeftTable(); } public void columnMoved(TableColumnModelEvent e) { resizeLeftTable(); } public void columnRemoved(TableColumnModelEvent e) { resizeLeftTable(); } public void columnSelectionChanged(ListSelectionEvent e) { resizeLeftTable(); } }; private MouseListener mouseListener = new MouseAdapter() { @Override() public void mousePressed(MouseEvent event) { if (event.isPopupTrigger() && !popupMenu.isVisible()) { popupMenu.show((Component)event.getSource(), event.getX(), event.getY()); } else if (event.getSource() == rightTable) { if (!rightTable.getCellSelectionEnabled()) { leftTable.clearSelection(); leftTable.setRowSelectionAllowed(false); leftTable.setCellSelectionEnabled(true); rightTable.setRowSelectionAllowed(false); rightTable.setCellSelectionEnabled(true); } } else if (event.getSource() == leftTable) { if (rightTable.getCellSelectionEnabled()) { leftTable.setCellSelectionEnabled(false); leftTable.setRowSelectionAllowed(true); rightTable.setCellSelectionEnabled(false); rightTable.setRowSelectionAllowed(true); } } } @Override() public void mouseClicked(MouseEvent event) { if (event.isPopupTrigger() && !popupMenu.isVisible()) { popupMenu.show((Component)event.getSource(), event.getX(), event.getY()); } } @Override() public void mouseReleased(MouseEvent event) { if (event.isPopupTrigger() && !popupMenu.isVisible()) { popupMenu.show((Component)event.getSource(), event.getX(), event.getY()); } } }; /** * Static initializer */ static { try { fontStyleNameMap.put(Font.PLAIN, "Plain Text"); fontStyleNameMap.put(Font.BOLD, "Bold Text"); fontStyleNameMap.put(Font.ITALIC, "Italic Text"); fontStyleIconMap.put(Font.PLAIN, getIcon(16, "font.png")); fontStyleIconMap.put(Font.BOLD, getIcon(16, "text_bold.png")); fontStyleIconMap.put(Font.ITALIC, getIcon(16, "text_italic.png")); formatNameMap.put(DataFrameCellFormat.DECIMAL, "Decimal"); formatNameMap.put(DataFrameCellFormat.PERCENT, "Percent"); formatNameMap.put(DataFrameCellFormat.SCIENTIFIC, "Scientific"); formatNameMap.put(DataFrameCellFormat.BASIS_POINTS, "Basis Points"); formatIconMap.put(DataFrameCellFormat.DECIMAL, getIcon(16, "number.png")); formatIconMap.put(DataFrameCellFormat.PERCENT, getIcon(16, "percent.png")); formatIconMap.put(DataFrameCellFormat.SCIENTIFIC, getIcon(16, "scientific.png")); formatIconMap.put(DataFrameCellFormat.BASIS_POINTS, getIcon(16, "bps.png")); alignmentNameMap.put(SwingConstants.LEFT, "Align Left"); alignmentNameMap.put(SwingConstants.CENTER, "Align Center"); alignmentNameMap.put(SwingConstants.RIGHT, "Align Right"); alignmentIconMap.put(SwingConstants.LEFT, getIcon(16, "text_align_left.png")); alignmentIconMap.put(SwingConstants.CENTER, getIcon(16, "text_align_center.png")); alignmentIconMap.put(SwingConstants.RIGHT, getIcon(16, "text_align_right.png")); } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } } /** * Constructor */ public DataFrameTable() { this(null); } /** * Constructor * @param frame the DataFrame for this table */ public DataFrameTable(DataFrame frame) { try { this.initPopupMenu(); this.initTable(leftTable); this.initTable(rightTable); this.leftTable.getColumnModel().addColumnModelListener(columnModelListener); this.scrollPane = new JScrollPane(rightTable); this.scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, leftTable.getTableHeader()); this.scrollPane.setRowHeaderView(leftTable); this.setLayout(new BorderLayout(0, 0)); this.add(scrollPane, BorderLayout.CENTER); this.setDataFrame(frame); this.scrollPane.getRowHeader().addChangeListener(new ChangeListener() { public void stateChanged(ChangeEvent event) { final JViewport leftViewPort = scrollPane.getRowHeader(); final JViewport rightViewPort = scrollPane.getViewport(); final Point leftPoint = leftViewPort.getViewPosition(); final Point rightPoint = rightViewPort.getViewPosition(); if (leftPoint.y != rightPoint.y) { rightViewPort.setViewPosition(new Point(rightPoint.x, leftPoint.y)); } } }); } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } } /** * Initializes a table component for this component * @param table the table */ private void initTable(JTable table) { try { table.setAutoCreateColumnsFromModel(false); table.setModel(model); table.setRowSorter(sorter); table.setShowGrid(true); table.setRowHeight(16); table.setGridColor(Color.GRAY); table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); table.setDefaultRenderer(Object.class, renderer); table.setDefaultRenderer(String.class, renderer); table.setDefaultRenderer(Double.class, renderer); table.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION); table.setSelectionModel(selectionModel); table.addMouseListener(mouseListener); } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } finally { createColumns(table); } } /** * Called to ofInts columns for the target table * @param table the table reference */ protected void createColumns(JTable table) { table.setColumnModel(new DefaultTableColumnModel()); if (table == leftTable) { table.addColumn(new TableColumn(0, 100, renderer, editor)); } else { for (int i=1; i DataFrame getDataFrame() { return (DataFrame)model.getFrame(); } /** * Sets the data frame instance to display in this viewer * @param frame the data frame to display, can be null */ public void setDataFrame(DataFrame frame) { try { this.model.setFrame(frame); this.leftTable.getColumnModel().removeColumnModelListener(columnModelListener); this.createColumns(leftTable); this.createColumns(rightTable); this.leftTable.getColumnModel().addColumnModelListener(columnModelListener); this.model.fireTableStructureChanged(); } finally { this.resizeLeftTable(); this.validateActions(); } } /** * Returns the default format for cells * @return the default format for cells */ public DataFrameCellFormat getDefaultCellFormat() { return defaultCellFormat; } /** * Sets the default cell format for this table * @param defaultCellFormat the default cell format */ public void setDefaultCellFormat(DataFrameCellFormat defaultCellFormat) { this.defaultCellFormat = defaultCellFormat; } /** * Returns the cell format for the row header cell (ie fixed column) * @param row the row key * @param create if true, ofInts a new cell format if none exists * @return the cell format, null if none exists and ofInts == false */ public DataFrameCellFormat getRowHeaderFormat(Object row, boolean create) { DataFrameCellFormat format = formatMap.get(row); if (format != null) return format; else if (!create) format = defaultCellFormat; else { format = new DataFrameCellFormat(); formatMap.put(row, format); } return format; } /** * Returns the cell format for row and column key * @param row the row key * @param column the column key * @param create if true, ofInts a new cell format if none exists * @return the cell format, null if none exists and ofInts == false */ public DataFrameCellFormat getCellFormat(Object row, Object column, boolean create) { if (formatFrame.rows().contains(row) && formatFrame.cols().contains(column)) { final int rowIndex = formatFrame.rows().ordinal(row); final int colIndex = formatFrame.cols().ordinal(column); DataFrameCellFormat format = formatFrame.getValueAt(rowIndex, colIndex); if (format == null && create) { format = new DataFrameCellFormat(); formatFrame.setValue(row, column, format); } return format; } else if (!create) { return defaultCellFormat; } else { formatFrame.rows().add(row); formatFrame.cols().add(column, DataFrameCellFormat.class); final DataFrameCellFormat format = new DataFrameCellFormat(); this.formatFrame.setValue(row, column, format); return format; } } /** * Returns the cell format for the row and column index * @param rowIndex the row index in view space * @param colIndex the column index in view space * @param create if true, ofInts a new cell format if none exists * @return the cell format, null if none exists and ofInts == false */ @SuppressWarnings("unchecked") public final DataFrameCellFormat getCellFormat(int rowIndex, int colIndex, boolean create) { final DataFrame data = model.getFrame(); if (colIndex < leftTable.getColumnCount()) { final int rowModelIndex = leftTable.convertRowIndexToModel(rowIndex); final Object row = data.rows().key(rowModelIndex); return getRowHeaderFormat(row, create); } else { final int actualColIndex = colIndex - leftTable.getColumnCount(); final int rowModelIndex = rightTable.convertRowIndexToModel(rowIndex); final int colModelIndex = rightTable.convertColumnIndexToModel(actualColIndex); final Object row = data.rows().key(rowModelIndex); final Object column = data.cols().key(colModelIndex - 1); return getCellFormat(row, column, create); } } /** * Returns the column index of the combined table * @param table the JTable reference * @param colIndex the column index on the JTable * @return the mapped column index */ int getColumnIndex(JTable table, int colIndex) { return leftTable == table ? colIndex : colIndex + leftTable.getColumnCount(); } /** * Called to set the decimal count for this editor * @param decimalCount the decimal count for editor */ public void setDecimalCount(int decimalCount) { this.decimalCount = decimalCount; } /** * Returns a new action to change the alignment for selected cells * @param alignment the alignment as per SwingConstants * @return the newly created action */ private Action createAlignmentAction(final int alignment) { final String name = alignmentNameMap.get(alignment); final Icon icon = alignmentIconMap.get(alignment); final String description = null; return new CustomAction(name, icon, description) { @SuppressWarnings("unchecked") public void actionPerformed(ActionEvent e) { try { final int[] rows = getSelectedRows(); final int[] columns = getSelectedColumns(); for (int row : rows) { for (int column : columns) { final DataFrameCellFormat format = getCellFormat(row, column, true); format.setAlignment(alignment); } } } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } finally { model.fireTableDataChanged(); } } }; } /** * Returns a new action to change the font type * @return the newly created action */ private Action createFontAction() { return new CustomAction("Font Face", null, null) { @SuppressWarnings("unchecked") public void actionPerformed(ActionEvent e) { try { final DataFrameTable parent = DataFrameTable.this; final String msg = "Select that font to accept to selected cells"; final GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); final String[] fonts = ge.getAvailableFontFamilyNames(); final String fontName = (String) JOptionPane.showInputDialog(parent, msg, "Font", JOptionPane.INFORMATION_MESSAGE, null, fonts, fonts[0]); if (fontName != null) { final Font font = new Font(fontName, Font.PLAIN, 11); final int[] rows = getSelectedRows(); final int[] columns = getSelectedColumns(); for (int row : rows) { for (int column : columns) { getCellFormat(row, column, true).setFont(font); } } } } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } finally { model.fireTableDataChanged(); } } }; } /** * Returns a new action to change the font style for selected cells * @param style the font style * @return the newly created action */ private Action createFontStyleAction(final int style) { final String name = fontStyleNameMap.get(style); final Icon icon = fontStyleIconMap.get(style); final String description = null; return new CustomAction(name, icon, description) { @SuppressWarnings("unchecked") public void actionPerformed(ActionEvent e) { try { final int[] rows = getSelectedRows(); final int[] columns = getSelectedColumns(); for (int row : rows) { for (int column : columns) { final DataFrameCellFormat cellFormat = getCellFormat(row, column, true); final Font font = cellFormat.getFont() != null ? cellFormat.getFont() : rightTable.getFont(); cellFormat.setFont(new Font(font.getName(), style, font.getSize())); } } } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } finally { model.fireTableDataChanged(); } } }; } /** * Returns a new action to accept a specific date format to selected cells * @param pattern the date format pattern * @return the newly created action */ private Action createDateFormatAction(final String pattern) { final Icon icon = getIcon(16, "date.png"); final String name = pattern + " (" + new SimpleDateFormat(pattern).format(new Date()) + ")"; return new CustomAction(name, icon, name) { @SuppressWarnings("unchecked") public void actionPerformed(ActionEvent e) { try { final int[] rows = getSelectedRows(); final int[] columns = getSelectedColumns(); for (int row : rows) { for (int column : columns) { getCellFormat(row, column, true).setDatePattern(pattern); } } } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } finally { model.fireTableDataChanged(); } } }; } /** * Creates a new action to accept a specific type of formatting to selected cells * @param numberType the number type * @param description the action description * @return newly created action */ private Action createNumberTypeAction(final Integer numberType, String description) { final Icon icon = formatIconMap.get(numberType); final String name = formatNameMap.get(numberType); return new CustomAction(name, icon, description) { @SuppressWarnings("unchecked") public void actionPerformed(ActionEvent e) { try { final int[] rows = getSelectedRows(); final int[] columns = getSelectedColumns(); for (int row : rows) { for (int column : columns) { final DataFrameCellFormat format = getCellFormat(row, column, true); if (format != null) { format.setNumberType(numberType); } } } } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } finally { model.fireTableDataChanged(); } } }; } /** * Creates a new action to increase decimal precision * @return newly created action */ private Action createIncreasePrecisionAction() { final Icon icon = getIcon(16, "add-decimal-place.png"); return new CustomAction("Increase Preicision", icon, "Increases numeric precision of selected cells") { @SuppressWarnings("unchecked") public void actionPerformed(ActionEvent e) { try { final int[] rows = getSelectedRows(); final int[] columns = getSelectedColumns(); for (int row : rows) { for (int column : columns) { getCellFormat(row, column, true).increasePrecision(); } } } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } finally { model.fireTableDataChanged(); } } }; } /** * Creates a new action to decrease decimal precision * @return newly created action */ private Action createDecreasePrecisionAction() { final Icon icon = getIcon(16, "delete-decimal-place.png"); return new CustomAction("Decrease Preicision", icon, "Decreases numeric precision of selected cells") { @SuppressWarnings("unchecked") public void actionPerformed(ActionEvent e) { try { final int[] rows = getSelectedRows(); final int[] columns = getSelectedColumns(); for (int row : rows) { for (int column : columns) { getCellFormat(row, column, true).decreasePrecision(); } } } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } finally { model.fireTableDataChanged(); } } }; } /** * Creates a new action to export data to excel * @return newly created action */ private Action createCsvExportAction() { final Icon icon = getIcon(16, "excel.png"); return new CustomAction("Export to CSV", icon, "Decreases numeric precision of selected cells") { public void actionPerformed(ActionEvent e) { try { if (decimalCount > 0) { decimalCount--; } } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } } }; } /** * Creates a new action to best fit columns * @return newly created action */ private Action createBestFitAction() { final Icon icon = getIcon(16, "table_best_fit.png"); return new CustomAction("Best Fit Columns", icon, "Resizes columns to optimal widths based on content") { public void actionPerformed(ActionEvent e) { try { final TableColumnModel columnModel = rightTable.getColumnModel(); for (int j = 0; j < columnModel.getColumnCount(); ++j) { int width = -1; final TableColumn column = columnModel.getColumn(j); final int modelIndex = column.getModelIndex(); final int columnIndex = rightTable.convertColumnIndexToView(modelIndex); final TableCellRenderer headerRenderer = rightTable.getTableHeader().getDefaultRenderer(); if (headerRenderer != null) { final String columnName = rightTable.getColumnName(j); final Component component = headerRenderer.getTableCellRendererComponent(rightTable, columnName, false, false, 0, columnIndex); if (component instanceof JComponent) { final JComponent jcomp = (JComponent) component; int stringWidth = (int) jcomp.getPreferredSize().getWidth(); stringWidth = stringWidth + jcomp.getInsets().left + jcomp.getInsets().right + 30; width = (stringWidth > width ? stringWidth : width); } } final TableModel model = rightTable.getModel(); for (int i = 0; i < model.getRowCount(); ++i) { final Object value = model.getValueAt(i, modelIndex); final Component component = renderer.getTableCellRendererComponent(rightTable, value, false, false, i, columnIndex); if (component instanceof JLabel) { final JLabel label = (JLabel) component; int stringWidth = (int) label.getPreferredSize().getWidth(); stringWidth = stringWidth + label.getInsets().left + label.getInsets().right + 4; width = (stringWidth > width ? stringWidth : width); } } if (width > 0) { column.setPreferredWidth(width); } } } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } } }; } /** * Creates a new action to change fill color of selected cells * @return newly created action */ private Action createFillColorAction() { final Icon icon = getIcon(16, "color.png"); return new CustomAction("Fill Color", icon, "Sets the background for selected cells") { @SuppressWarnings("unchecked") public void actionPerformed(ActionEvent e) { try { final Color color = JColorChooser.showDialog(DataFrameTable.this, "Background", Color.WHITE); if (color != null) { final int[] rows = getSelectedRows(); final int[] columns = getSelectedColumns(); for (int row : rows) { for (int column : columns) { final DataFrameCellFormat format = getCellFormat(row, column, true); format.setBackground(color); } } } } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } finally { model.fireTableDataChanged(); } } }; } /** * Creates a new action to change font color of selected cells * @return newly created action */ private Action createFontColorAction() { final Icon icon = getIcon(16, "edit-color.png"); return new CustomAction("Font Color", icon, "Sets the font color for selected cells") { @SuppressWarnings("unchecked") public void actionPerformed(ActionEvent e) { try { final Color color = JColorChooser.showDialog(DataFrameTable.this, "Foreground", Color.WHITE); if (color != null) { final int[] rows = getSelectedRows(); final int[] columns = getSelectedColumns(); for (int row : rows) { for (int column : columns) { final DataFrameCellFormat format = getCellFormat(row, column, true); format.setForeground(color); } } } } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } finally { model.fireTableDataChanged(); } } }; } /** * Creates a new action to change font color of selected cells * @return newly created action */ private Action createConditionalFontColorAction() { final Icon icon = getIcon(16, "edit-color.png"); return new CustomAction("Green / Red Font Color", icon, "Sets the font color for selected cells") { @SuppressWarnings("unchecked") public void actionPerformed(ActionEvent e) { try { final int[] rows = getSelectedRows(); final int[] columns = getSelectedColumns(); for (int row : rows) { for (int column : columns) { final Color zero = leftTable.getForeground(); final Color positive = Color.GREEN; final Color negative = Color.RED; final DataFrameCellFormat format = getCellFormat(row, column, true); format.setForeground(DataFrameCellRenderer.createColorProperty(zero, positive, negative)); } } } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } finally { model.fireTableDataChanged(); } } }; } /** * Creates a new action to clear the formatting on selected cells * @return newly created action */ private Action createClearFormatAction() { final Icon icon = getIcon(16, "edit-color.png"); return new CustomAction("Clear Formatting", icon, "Removes any formatting applied to the selected cells") { @SuppressWarnings("unchecked") public void actionPerformed(ActionEvent e) { try { final int[] rows = getSelectedRows(); final int[] columns = getSelectedColumns(); for (int row : rows) { for (int column : columns) { final DataFrameCellFormat format = getCellFormat(row, column, false); if (format != null) { //format.clear(); } } } } catch (Throwable t) { LOG.log(Level.SEVERE, t.getMessage(), t); } finally { model.fireTableDataChanged(); } } }; } /** * Called to validate this components actions */ private void validateActions() { this.increasePrecisionAction.setEnabled(true); this.decreasePrecisionAction.setEnabled(true); this.exportCsvAction.setEnabled(model.getRowCount() > 0); } /** * Returns the selected row indices in view space * @return the selected row indices */ public int[] getSelectedRows() { return rightTable.getSelectedRows(); } /** * Returns the selected column indices in view space * @return the selected column indices */ public int[] getSelectedColumns() { final int[] columns1 = leftTable.getSelectedColumns(); final int[] columns2 = rightTable.getSelectedColumns(); final int[] columns = new int[columns1.length + columns2.length]; System.arraycopy(columns1, 0, columns, 0, columns1.length); for (int i=0; i