Java tutorial
/* * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* * InstancesSummaryPanel.java * Copyright (C) 1999-2012 University of Waikato, Hamilton, New Zealand * */ package weka.gui; import java.awt.BorderLayout; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.BorderFactory; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.SwingConstants; import weka.core.Instances; import weka.core.Utils; /** * This panel just displays relation name, number of instances, and number of * attributes. * * @author Len Trigg (trigg@cs.waikato.ac.nz) * @version $Revision$ */ public class InstancesSummaryPanel extends JPanel { /** for serialization */ private static final long serialVersionUID = -5243579535296681063L; /** Message shown when no instances have been loaded */ protected static final String NO_SOURCE = "None"; /** Displays the name of the relation */ protected JLabel m_RelationNameLab = new JLabel(NO_SOURCE); /** Displays the number of instances */ protected JLabel m_NumInstancesLab = new JLabel(NO_SOURCE); /** Displays the number of attributes */ protected JLabel m_NumAttributesLab = new JLabel(NO_SOURCE); /** Displays the sum of instance weights */ protected JLabel m_sumOfWeightsLab = new JLabel(NO_SOURCE); /** The instances we're playing with */ protected Instances m_Instances; /** * Whether to display 0 or ? for the number of instances in cases where a * dataset has only structure. Depending on where this panel is used from, the * user may have loaded a dataset with no instances or a Loader that can read * incrementally may be being used (in which case we don't know how many * instances are in the dataset... yet). */ protected boolean m_showZeroInstancesAsUnknown = false; /** * Creates the instances panel with no initial instances. */ public InstancesSummaryPanel() { GridBagLayout gbLayout = new GridBagLayout(); setLayout(gbLayout); JLabel lab = new JLabel("Relation:", SwingConstants.RIGHT); lab.setBorder(BorderFactory.createEmptyBorder(0, 10, 0, 0)); GridBagConstraints gbConstraints = new GridBagConstraints(); gbConstraints.anchor = GridBagConstraints.EAST; gbConstraints.fill = GridBagConstraints.HORIZONTAL; gbConstraints.gridy = 0; gbConstraints.gridx = 0; gbLayout.setConstraints(lab, gbConstraints); add(lab); gbConstraints = new GridBagConstraints(); gbConstraints.anchor = GridBagConstraints.WEST; gbConstraints.fill = GridBagConstraints.HORIZONTAL; gbConstraints.gridy = 0; gbConstraints.gridx = 1; gbConstraints.weightx = 100; // gbConstraints.gridwidth = // GridBagConstraints.RELATIVE; gbLayout.setConstraints(m_RelationNameLab, gbConstraints); add(m_RelationNameLab); m_RelationNameLab.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 10)); lab = new JLabel("Instances:", SwingConstants.RIGHT); lab.setBorder(BorderFactory.createEmptyBorder(0, 10, 0, 0)); gbConstraints = new GridBagConstraints(); gbConstraints.anchor = GridBagConstraints.EAST; gbConstraints.fill = GridBagConstraints.HORIZONTAL; gbConstraints.gridy = 1; gbConstraints.gridx = 0; gbLayout.setConstraints(lab, gbConstraints); add(lab); gbConstraints = new GridBagConstraints(); gbConstraints.anchor = GridBagConstraints.WEST; gbConstraints.fill = GridBagConstraints.HORIZONTAL; gbConstraints.gridy = 1; gbConstraints.gridx = 1; gbConstraints.weightx = 100; gbLayout.setConstraints(m_NumInstancesLab, gbConstraints); add(m_NumInstancesLab); m_NumInstancesLab.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 10)); lab = new JLabel("Attributes:", SwingConstants.RIGHT); lab.setBorder(BorderFactory.createEmptyBorder(0, 10, 0, 0)); gbConstraints = new GridBagConstraints(); gbConstraints.anchor = GridBagConstraints.EAST; gbConstraints.fill = GridBagConstraints.HORIZONTAL; gbConstraints.gridy = 0; gbConstraints.gridx = 2; gbLayout.setConstraints(lab, gbConstraints); add(lab); gbConstraints = new GridBagConstraints(); gbConstraints.anchor = GridBagConstraints.WEST; gbConstraints.fill = GridBagConstraints.HORIZONTAL; gbConstraints.gridy = 0; gbConstraints.gridx = 3; // gbConstraints.weightx = 100; gbLayout.setConstraints(m_NumAttributesLab, gbConstraints); add(m_NumAttributesLab); m_NumAttributesLab.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 10)); lab = new JLabel("Sum of weights:", SwingConstants.RIGHT); lab.setBorder(BorderFactory.createEmptyBorder(0, 10, 0, 0)); gbConstraints = new GridBagConstraints(); gbConstraints.anchor = GridBagConstraints.EAST; gbConstraints.fill = GridBagConstraints.HORIZONTAL; gbConstraints.gridy = 1; gbConstraints.gridx = 2; gbLayout.setConstraints(lab, gbConstraints); add(lab); gbConstraints = new GridBagConstraints(); gbConstraints.anchor = GridBagConstraints.WEST; gbConstraints.fill = GridBagConstraints.HORIZONTAL; gbConstraints.gridy = 1; gbConstraints.gridx = 3; // gbConstraints.weightx = 100; gbLayout.setConstraints(m_sumOfWeightsLab, gbConstraints); add(m_sumOfWeightsLab); m_sumOfWeightsLab.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 10)); } /** * Set whether to show zero instances as unknown (i.e. "?" rather than zero). * This is useful if header information has been read and the instances * themselves will be loaded incrementally. * * @param zeroAsUnknown true if zero instances will be displayed as "unknown", * i.e. "?" */ public void setShowZeroInstancesAsUnknown(boolean zeroAsUnknown) { m_showZeroInstancesAsUnknown = zeroAsUnknown; } /** * Get whether to show zero instances as unknown (i.e. "?" rather than zero). * This is useful if header information has been read and the instances * themselves will be loaded incrementally. * * @return true if zero instances will be displayed as "unknown", i.e. "?" */ public boolean getShowZeroInstancesAsUnknown() { return m_showZeroInstancesAsUnknown; } /** * Tells the panel to use a new set of instances. * * @param inst a set of Instances */ public void setInstances(Instances inst) { m_Instances = inst; m_RelationNameLab.setText(m_Instances.relationName()); m_RelationNameLab.setToolTipText(m_Instances.relationName()); m_NumInstancesLab.setText("" + ((m_showZeroInstancesAsUnknown && m_Instances.numInstances() == 0) ? "?" : "" + m_Instances.numInstances())); m_NumAttributesLab.setText("" + m_Instances.numAttributes()); m_sumOfWeightsLab.setText("" + ((m_showZeroInstancesAsUnknown && m_Instances.numInstances() == 0) ? "?" : "" + Utils.doubleToString(m_Instances.sumOfWeights(), 3))); } /** * Tests out the instance summary panel from the command line. * * @param args optional name of dataset to load */ public static void main(String[] args) { try { final javax.swing.JFrame jf = new javax.swing.JFrame("Instances Panel"); jf.getContentPane().setLayout(new BorderLayout()); final InstancesSummaryPanel p = new InstancesSummaryPanel(); p.setBorder(BorderFactory.createTitledBorder("Relation")); jf.getContentPane().add(p, BorderLayout.CENTER); jf.addWindowListener(new java.awt.event.WindowAdapter() { @Override public void windowClosing(java.awt.event.WindowEvent e) { jf.dispose(); System.exit(0); } }); jf.pack(); jf.setVisible(true); if (args.length == 1) { java.io.Reader r = new java.io.BufferedReader(new java.io.FileReader(args[0])); Instances i = new Instances(r); p.setInstances(i); } } catch (Exception ex) { ex.printStackTrace(); System.err.println(ex.getMessage()); } } }