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JCommon is a free general purpose Java class library that is used in
several projects at www.jfree.org, including JFreeChart and
JFreeReport.
/* ========================================================================
* JCommon : a free general purpose class library for the Java(tm) platform
* ========================================================================
*
* (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jcommon/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* -------------------------------
* SystemPropertiesTableModel.java
* -------------------------------
* (C) Copyright 2000-2008, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* $Id: SystemPropertiesTableModel.java,v 1.6 2008/12/18 09:57:32 mungady Exp $
*
* Changes (from 26-Oct-2001)
* --------------------------
* 26-Oct-2001 : Changed package to com.jrefinery.ui (DG);
* 28-Feb-2001 : Changed package to com.jrefinery.ui.about (DG);
* 15-Mar-2002 : Modified to use a ResourceBundle for elements that require
* localisation (DG);
* 08-Oct-2002 : Fixed errors reported by Checkstyle (DG);
* 18-Dec-2008 : Use ResourceBundleWrapper - see JFreeChart patch 1607918 by
* Jess Thrysoee (DG);
*
*/
package org.jfree.ui.about;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.ResourceBundle;
import org.jfree.ui.SortableTableModel;
import org.jfree.util.ResourceBundleWrapper;
/**
* A sortable table model containing the system properties.
*
* @author David Gilbert
*/
public class SystemPropertiesTableModel extends SortableTableModel {
/**
* Useful class for holding the name and value of a system property.
*
*/
protected static class SystemProperty {
/** The property name. */
private String name;
/** The property value. */
private String value;
/**
* Standard constructor - builds a new SystemProperty.
*
* @param name the property name.
* @param value the property value.
*/
public SystemProperty(final String name, final String value) {
this.name = name;
this.value = value;
}
/**
* Returns the property name.
*
* @return the property name.
*/
public String getName() {
return this.name;
}
/**
* Returns the property value.
*
* @return the property value.
*/
public String getValue() {
return this.value;
}
}
/**
* A class for comparing SystemProperty objects.
*
*/
protected static class SystemPropertyComparator implements Comparator {
/** Indicates the sort order. */
private boolean ascending;
/**
* Standard constructor.
*
* @param ascending a flag that controls the sort order (ascending or
* descending).
*/
public SystemPropertyComparator(final boolean ascending) {
this.ascending = ascending;
}
/**
* Compares two objects.
*
* @param o1 the first object.
* @param o2 the second object.
*
* @return an integer that indicates the relative order of the objects.
*/
public int compare(final Object o1, final Object o2) {
if ((o1 instanceof SystemProperty)
&& (o2 instanceof SystemProperty)) {
final SystemProperty sp1 = (SystemProperty) o1;
final SystemProperty sp2 = (SystemProperty) o2;
if (this.ascending) {
return sp1.getName().compareTo(sp2.getName());
}
else {
return sp2.getName().compareTo(sp1.getName());
}
}
else {
return 0;
}
}
/**
* Returns true if this object is equal to the specified
* object, and false otherwise.
*
* @param o the other object.
*
* @return A boolean.
*/
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (!(o instanceof SystemPropertyComparator)) {
return false;
}
final SystemPropertyComparator systemPropertyComparator
= (SystemPropertyComparator) o;
if (this.ascending != systemPropertyComparator.ascending) {
return false;
}
return true;
}
/**
* Returns a hash code value for the object.
*
* @return the hashcode
*/
public int hashCode() {
return (this.ascending ? 1 : 0);
}
}
/** Storage for the properties. */
private List properties;
/** Localised name column label. */
private String nameColumnLabel;
/** Localised property column label. */
private String valueColumnLabel;
/**
* Creates a new table model using the properties of the current Java
* Virtual Machine.
*/
public SystemPropertiesTableModel() {
this.properties = new java.util.ArrayList();
try {
final Properties p = System.getProperties();
final Iterator iterator = p.keySet().iterator();
while (iterator.hasNext()) {
final String name = (String) iterator.next();
final String value = System.getProperty(name);
final SystemProperty sp = new SystemProperty(name, value);
this.properties.add(sp);
}
}
catch (SecurityException se) {
// ignore SecurityExceptions
}
Collections.sort(this.properties, new SystemPropertyComparator(true));
final String baseName = "org.jfree.ui.about.resources.AboutResources";
final ResourceBundle resources = ResourceBundleWrapper.getBundle(
baseName);
this.nameColumnLabel = resources.getString(
"system-properties-table.column.name");
this.valueColumnLabel = resources.getString(
"system-properties-table.column.value");
}
/**
* Returns true for the first column, and false otherwise - sorting is only
* allowed on the first column.
*
* @param column the column index.
*
* @return true for column 0, and false for all other columns.
*/
public boolean isSortable(final int column) {
if (column == 0) {
return true;
}
else {
return false;
}
}
/**
* Returns the number of rows in the table model (that is, the number of
* system properties).
*
* @return the row count.
*/
public int getRowCount() {
return this.properties.size();
}
/**
* Returns the number of columns in the table model. In this case, there
* are two columns: one for the property name, and one for the property
* value.
*
* @return the column count (always 2 in this case).
*/
public int getColumnCount() {
return 2;
}
/**
* Returns the name of the specified column.
*
* @param column the column index.
*
* @return the column name.
*/
public String getColumnName(final int column) {
if (column == 0) {
return this.nameColumnLabel;
}
else {
return this.valueColumnLabel;
}
}
/**
* Returns the value at the specified row and column. This method supports
* the TableModel interface.
*
* @param row the row index.
* @param column the column index.
*
* @return the value.
*/
public Object getValueAt(final int row, final int column) {
final SystemProperty sp = (SystemProperty) this.properties.get(row);
if (column == 0) {
return sp.getName();
}
else {
if (column == 1) {
return sp.getValue();
}
else {
return null;
}
}
}
/**
* Sorts on the specified column.
*
* @param column the column index.
* @param ascending a flag that controls the sort order.
*
*/
public void sortByColumn(final int column, final boolean ascending) {
if (isSortable(column)) {
super.sortByColumn(column, ascending);
Collections.sort(this.properties,
new SystemPropertyComparator(ascending));
}
}
}
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