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Java 8 Swing Date Picker. Easy to use, good looking, nice features, and
localized. Uses the JSR-310 standard.
package com.github.lgooddatepicker.zinternaltools;
import java.awt.GridBagConstraints;
import java.util.ArrayList;
import java.util.Locale;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.github.lgooddatepicker.optionalusertools.DateVetoPolicy;
import com.github.lgooddatepicker.optionalusertools.PickerUtilities;
import com.github.lgooddatepicker.optionalusertools.TimeVetoPolicy;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.Window;
import java.io.DataInputStream;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalTime;
import java.time.chrono.IsoChronology;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.format.FormatStyle;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.swing.DefaultCellEditor;
import javax.swing.JTable;
import javax.swing.UIDefaults;
import javax.swing.table.TableCellEditor;
/**
* InternalUtilities, This class contains static functions that are used by the date picker or the
* calendar panel. Some of these functions are large, and were separated out of the date picker
* class or calendar panel class in order to improve the readability of those classes.
*/
public class InternalUtilities {
/**
* areObjectsEqual, This function exists as a workaround for the fact that Objects.equals() did
* not exist in Java 1.6.
*
* Returns {@code true} if the arguments are equal to each other and {@code false} otherwise.
* Consequently, if both arguments are {@code null}, {@code true} is returned and if exactly one
* argument is {@code null}, {@code
* false} is returned. Otherwise, equality is determined by using the
* {@link Object#equals equals} method of the first argument.
*
* @param a an object
* @param b an object to be compared with {@code a} for equality
* @return {@code true} if the arguments are equal to each other and {@code false} otherwise
* @see Object#equals(Object)
*/
public static boolean areObjectsEqual(Object a, Object b) {
return (a == b) || (a != null && a.equals(b));
}
/**
* doesParsedDateMatchText, This compares the numbers in a parsed date, to the original text
* from which the date was parsed. Specifically this compares the day of the month and the year
* of the parsed date to the text. On a technical note, this function is not aware of which
* field is which, but that ambiguity does not prevent it from performing a successful
* comparison on all tested cases. This will return true if the dates are a match, or otherwise
* return false.
*
* Testing note: This function has been thoroughly tested and gives the proper result with all
* valid and invalid dates in the years between -10000 and 10000 inclusive. Valid dates are
* defined as those dates that are returned from the LocalDate class, when using the
* localDate.plusDays(1) function. Invalid dates are defined as any of the following: The 31st
* day of February, April, June, September, or November. The 30th day of February. Or the 29th
* day of February on any year that is not a leap year.
*/
static public boolean doesParsedDateMatchText(LocalDate parsedDate, String text,
Locale formatLocale) {
if (parsedDate == null || text == null) {
return false;
}
text = text.toLowerCase();
// This only matches numbers, and it does not include any hyphen "-".
Pattern pattern = Pattern.compile("\\d+");
Matcher matcher = pattern.matcher(text);
ArrayList unsignedNumbersFound = new ArrayList();
while (matcher.find()) {
String foundString = matcher.group();
foundString = forceNumberStringToTwoDigits(foundString);
unsignedNumbersFound.add(foundString);
}
String parsedDayOfMonth = "" + parsedDate.getDayOfMonth();
parsedDayOfMonth = forceNumberStringToTwoDigits(parsedDayOfMonth);
boolean dayOfMonthFound = unsignedNumbersFound.remove(parsedDayOfMonth);
DateTimeFormatter formatBC = DateTimeFormatter.ofPattern("G", formatLocale);
String eraBCString = LocalDate.of(-100, 1, 1).format(formatBC).toLowerCase();
if (parsedDate.getYear() < 1 && text.contains(eraBCString)) {
String parsedYearForBC = "" + (parsedDate.getYear() - 1);
parsedYearForBC = parsedYearForBC.replace("-", "");
parsedYearForBC = forceNumberStringToTwoDigits(parsedYearForBC);
boolean yearFoundForBC = unsignedNumbersFound.remove(parsedYearForBC);
return yearFoundForBC && dayOfMonthFound;
} else {
String parsedYear = "" + parsedDate.getYear();
parsedYear = parsedYear.replace("-", "");
parsedYear = forceNumberStringToTwoDigits(parsedYear);
boolean yearFound = unsignedNumbersFound.remove(parsedYear);
return yearFound && dayOfMonthFound;
}
}
/**
* getJavaRunningVersionAsDouble, Returns a double with the currently running java version.
*/
public static double getJavaRunningVersionAsDouble() {
String version = System.getProperty("java.version");
int pos = version.indexOf('.');
pos = version.indexOf('.', pos + 1);
return Double.parseDouble(version.substring(0, pos));
}
/**
* getJavaRunningVersionAsString, Returns a string with the currently running java version.
*/
public static String getJavaRunningVersionAsString() {
String version = System.getProperty("java.version");
return version;
}
/**
* getJavaTargetVersionFromPom, Returns a string with the java "target" version, as it was
* specified in the pom file at compile time.
*/
public static String getJavaTargetVersionFromPom() {
try {
Properties properties = new Properties();
ClassLoader classLoader = ClassLoader.getSystemClassLoader();
properties.load(classLoader.getResourceAsStream("project.properties"));
return "" + properties.getProperty("targetJavaVersion");
} catch (Exception ex) {
return "";
}
}
/**
* getMostCommonElementInList, This returns the most common element in the supplied list. In the
* event of a tie, any element that is tied as the "largest element" may be returned. If the
* list has no elements, or if the list is null, then this will return null. This can also
* return null if null happens to be the most common element in the source list.
*/
public static T getMostCommonElementInList(List sourceList) {
if (sourceList == null || sourceList.isEmpty()) {
return null;
}
Map hashMap = new HashMap();
for (T element : sourceList) {
Integer countOrNull = hashMap.get(element);
int newCount = (countOrNull == null) ? 1 : (countOrNull + 1);
hashMap.put(element, newCount);
}
// Find the largest entry.
// In the event of a tie, the first entry (the first entry in the hash map, not in the list)
// with the maximum count will be returned.
Entry largestEntry = null;
for (Entry currentEntry : hashMap.entrySet()) {
if (largestEntry == null || currentEntry.getValue() > largestEntry.getValue()) {
largestEntry = currentEntry;
}
}
T result = (largestEntry == null) ? null : largestEntry.getKey();
return result;
}
/**
* getProjectVersionString, Returns a string with the project version number.
*/
public static String getProjectVersionString() {
try {
Properties properties = new Properties();
ClassLoader classLoader = ClassLoader.getSystemClassLoader();
properties.load(classLoader.getResourceAsStream("project.properties"));
return "v" + properties.getProperty("projectVersion");
} catch (Exception ex) {
return "";
}
}
/**
* getScreenInsets, This returns the insets of the screen, which are defined by any task bars
* that have been set up by the user. This function accounts for multi-monitor setups. If a
* window is supplied, then the the monitor that contains the window will be used. If a window
* is not supplied, then the primary monitor will be used.
*/
static public Insets getScreenInsets(Window windowOrNull) {
Insets insets;
if (windowOrNull == null) {
insets = Toolkit.getDefaultToolkit().getScreenInsets(GraphicsEnvironment
.getLocalGraphicsEnvironment().getDefaultScreenDevice()
.getDefaultConfiguration());
} else {
insets = windowOrNull.getToolkit().getScreenInsets(
windowOrNull.getGraphicsConfiguration());
}
return insets;
}
/**
* getScreenTotalArea, This returns the total area of the screen. (The total area includes any
* task bars.) This function accounts for multi-monitor setups. If a window is supplied, then
* the the monitor that contains the window will be used. If a window is not supplied, then the
* primary monitor will be used.
*/
static public Rectangle getScreenTotalArea(Window windowOrNull) {
Rectangle bounds;
if (windowOrNull == null) {
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
bounds = ge.getDefaultScreenDevice().getDefaultConfiguration().getBounds();
} else {
GraphicsConfiguration gc = windowOrNull.getGraphicsConfiguration();
bounds = gc.getBounds();
}
return bounds;
}
/**
* getScreenWorkingArea, This returns the working area of the screen. (The working area excludes
* any task bars.) This function accounts for multi-monitor setups. If a window is supplied,
* then the the monitor that contains the window will be used. If a window is not supplied, then
* the primary monitor will be used.
*/
static public Rectangle getScreenWorkingArea(Window windowOrNull) {
Insets insets;
Rectangle bounds;
if (windowOrNull == null) {
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
insets = Toolkit.getDefaultToolkit().getScreenInsets(ge.getDefaultScreenDevice()
.getDefaultConfiguration());
bounds = ge.getDefaultScreenDevice().getDefaultConfiguration().getBounds();
} else {
GraphicsConfiguration gc = windowOrNull.getGraphicsConfiguration();
insets = windowOrNull.getToolkit().getScreenInsets(gc);
bounds = gc.getBounds();
}
bounds.x += insets.left;
bounds.y += insets.top;
bounds.width -= (insets.left + insets.right);
bounds.height -= (insets.top + insets.bottom);
return bounds;
}
/**
* forceNumberStringToTwoDigits, This takes a string of digits, and forces it to be two digits
* long. First any extra leftmost digits are truncated, leaving only the right one digit or
* right two digits. If there is only one digit, it is zero padded to enforce a two digit string
* result. This function is used by the DatePickerUtilities.doesParsedDateMatchText() function.
*/
private static String forceNumberStringToTwoDigits(String text) {
while (text.length() < 2) {
text = "0" + text;
}
if (text.length() > 2) {
text = text.substring(text.length() - 2, text.length());
}
return text;
}
/**
* generateDefaultFormatterCE, This returns a default formatter for the specified locale, that
* can be used for displaying or parsing AD dates. The formatter is generated from the default
* FormatStyle.LONG formatter in the specified locale.
*/
public static DateTimeFormatter generateDefaultFormatterCE(Locale pickerLocale) {
DateTimeFormatter formatCE = new DateTimeFormatterBuilder().parseLenient().
parseCaseInsensitive().appendLocalized(FormatStyle.LONG, null).
toFormatter(pickerLocale);
// Get the local language as a string.
String language = pickerLocale.getLanguage();
// Override the format for the turkish locale to remove the name of the weekday.
if ("tr".equals(language)) {
formatCE = PickerUtilities.createFormatterFromPatternString(
"dd MMMM yyyy", pickerLocale);
}
// Return the generated format.
return formatCE;
}
/**
* generateDefaultFormatterBCE, This returns a default formatter for the specified locale, that
* can be used for displaying or parsing BC dates. The formatter is generated from the default
* FormatStyle.LONG formatter in the specified locale. The resulting format is intended to be
* nearly identical to the default formatter used for AD dates.
*/
public static DateTimeFormatter generateDefaultFormatterBCE(Locale pickerLocale) {
// This is verified to work for the following locale languages:
// en, de, fr, pt, ru, it, nl, es, pl, da, ro, sv, zh.
String displayFormatterBCPattern = DateTimeFormatterBuilder.getLocalizedDateTimePattern(
FormatStyle.LONG, null, IsoChronology.INSTANCE, pickerLocale);
displayFormatterBCPattern = displayFormatterBCPattern.replace("y", "u");
// Note: We could have used DateUtilities.createFormatterFromPatternString(), which should
// have the same formatter options as this line. We kept this code independent in case
// anyone ever mistakenly changes that utility function.
DateTimeFormatter displayFormatterBC = new DateTimeFormatterBuilder().parseLenient()
.parseCaseInsensitive().appendPattern(displayFormatterBCPattern)
.toFormatter(pickerLocale);
// Get the local language as a string.
String language = pickerLocale.getLanguage();
// Override the format for the turkish locale to remove the name of the weekday.
if ("tr".equals(language)) {
displayFormatterBC = PickerUtilities.createFormatterFromPatternString(
"dd MMMM uuuu", pickerLocale);
}
return displayFormatterBC;
}
/**
* getParsedDateOrNull, This takes text from the date picker text field, and tries to parse it
* into a java.time.LocalDate instance. If the text cannot be parsed, this will return null.
*
* Implementation note: The DateTimeFormatter parsing class was accepting invalid dates like
* February 31st, and returning the last valid date of the month, like Feb 28. This could be
* seen as an attempt to be lenient, but in the context of the date picker class it is
* considered a mistake or a bug. There was no setting to disable that functionality. So, this
* function calls another function called doesParsedDateMatchText(), to analyze and reject those
* kinds of mistakes. If the parsed text does not match the day of the month (and year) of the
* parsed date, then this function will return null.
*/
static public LocalDate getParsedDateOrNull(String text, DateTimeFormatter displayFormatterAD,
DateTimeFormatter displayFormatterBC, ArrayList parsingFormatters,
Locale formatLocale) {
if (text == null || text.trim().isEmpty()) {
return null;
}
text = text.trim().toLowerCase();
LocalDate parsedDate = null;
if (parsedDate == null) {
try {
parsedDate = LocalDate.parse(text, displayFormatterAD);
} catch (Exception ex) {
}
}
if (parsedDate == null) {
try {
// Note: each parse attempt must have its own try/catch block.
parsedDate = LocalDate.parse(text, displayFormatterBC);
} catch (Exception ex) {
}
}
for (int i = 0; ((parsedDate == null) && (i < parsingFormatters.size())); ++i) {
try {
parsedDate = LocalDate.parse(text, parsingFormatters.get(i));
} catch (Exception ex) {
}
}
// Check for any "successfully" parsed but nonexistent dates like Feb 31.
// Note, this function has been thoroughly tested. See the function docs for details.
if ((parsedDate != null) && (!InternalUtilities.doesParsedDateMatchText(
parsedDate, text, formatLocale))) {
return null;
}
return parsedDate;
}
public static LocalTime getParsedTimeOrNull(String timeText,
DateTimeFormatter formatForDisplayTime, DateTimeFormatter formatForMenuTimes,
ArrayList formatsForParsing, Locale timePickerLocale) {
if (timeText == null || timeText.trim().isEmpty()) {
return null;
}
timeText = timeText.trim().toLowerCase();
LocalTime parsedTime = null;
if (parsedTime == null) {
try {
parsedTime = LocalTime.parse(timeText, formatForDisplayTime);
} catch (Exception ex) {
}
}
if (parsedTime == null) {
try {
// Note: each parse attempt must have its own try/catch block.
parsedTime = LocalTime.parse(timeText, formatForMenuTimes);
} catch (Exception ex) {
}
}
for (int i = 0; ((parsedTime == null) && (i < formatsForParsing.size())); ++i) {
try {
parsedTime = LocalTime.parse(timeText, formatsForParsing.get(i));
} catch (Exception ex) {
}
}
return parsedTime;
}
/**
* capitalizeFirstLetterOfString, This capitalizes the first letter of the supplied string, in a
* way that is sensitive to the specified locale.
*/
static String capitalizeFirstLetterOfString(String text, Locale locale) {
if (text == null || text.length() < 1) {
return text;
}
String textCapitalized = text.substring(0, 1).toUpperCase(locale) + text.substring(1);
return textCapitalized;
}
/**
* getConstraints, This returns a grid bag constraints object that can be used for placing a
* component appropriately into a grid bag layout.
*/
static public GridBagConstraints getConstraints(int gridx, int gridy) {
GridBagConstraints gc = new GridBagConstraints();
gc.fill = GridBagConstraints.BOTH;
gc.gridx = gridx;
gc.gridy = gridy;
return gc;
}
/**
* isDateVetoed, This is a convenience function for checking whether or not a particular date is
* vetoed. Note that veto policies do not have any say about null dates, so this function always
* returns false for null dates.
*/
static public boolean isDateVetoed(DateVetoPolicy policy, LocalDate date) {
if (policy == null || date == null) {
return false;
}
return (!policy.isDateAllowed(date));
}
public static boolean isTimeVetoed(TimeVetoPolicy policy, LocalTime time) {
if (policy == null) {
return false;
}
return (!policy.isTimeAllowed(time));
}
/**
* safeSubstring, This is a version of the substring function which is guaranteed to never throw
* an exception. If the supplied string is null then this will return null. If the beginIndex or
* endIndexExclusive are out of range for the string, then the indexes will be compressed to fit
* within the bounds of the supplied string. If the beginIndex is greater than or equal to
* endIndexExclusive, then this will return an empty string.
*/
static public String safeSubstring(String text, int beginIndex, int endIndexExclusive) {
if (text == null) {
return null;
}
int textLength = text.length();
if (beginIndex < 0) {
beginIndex = 0;
}
if (endIndexExclusive < 0) {
endIndexExclusive = 0;
}
if (endIndexExclusive > textLength) {
endIndexExclusive = textLength;
}
if (beginIndex > endIndexExclusive) {
beginIndex = endIndexExclusive;
}
if (beginIndex == endIndexExclusive) {
return "";
}
return text.substring(beginIndex, endIndexExclusive);
}
/**
* getCompiledJavaVersionFromJavaClassFile, Given an input stream to a Java class file, this
* will return the major or minor version of Java that was used to compile the file. In a Maven
* POM file, this is known as the "target" version of Java that was used to compile the file.
*
* Getting an input stream for a class file inside a jar file:
*
* InputStream input = getClass().getResourceAsStream("/classpath/to/my/file.class");
*/
public static int getCompiledJavaVersionFromJavaClassFile(
InputStream classByteStream, boolean majorVersionRequested)
throws Exception {
DataInputStream dataInputStream = new DataInputStream(classByteStream);
// Skip the "magic number".
dataInputStream.readInt();
int minorVersion = dataInputStream.readUnsignedShort();
int majorVersion = dataInputStream.readUnsignedShort();
return (majorVersionRequested) ? majorVersion : minorVersion;
}
/**
* getCompiledJavaMajorVersionFromJavaClassFileAsString, Given an input stream to a Java class
* file, this will return the major version of Java that was used to compile the file (as a
* string). In a Maven POM file, this is known as the "target" version of Java that was used to
* compile the file.
*
* Getting an input stream for a class file inside a jar file:
*
* InputStream input = getClass().getResourceAsStream("/classpath/to/my/file.class");
*/
public static String getCompiledJavaMajorVersionFromJavaClassFileAsString(
InputStream classByteStream) throws Exception {
int majorVersion = getCompiledJavaVersionFromJavaClassFile(classByteStream, true);
switch (majorVersion) {
case 50:
return "Java 6";
case 51:
return "Java 7";
case 52:
return "Java 8";
default:
return "Could not find version string for major version: " + majorVersion;
}
}
/**
* setDefaultTableEditorsClicks, This sets the number of clicks required to start the default
* table editors in the supplied table. Typically you would set the table editors to start after
* 1 click or 2 clicks, as desired.
*
* The default table editors of the table editors that are supplied by the JTable class, for
* Objects, Numbers, and Booleans. Note, the editor which is used to edit Objects, is the same
* editor used for editing Strings.
*/
public static void setDefaultTableEditorsClicks(JTable table, int clickCountToStart) {
TableCellEditor editor;
editor = table.getDefaultEditor(Object.class);
if (editor instanceof DefaultCellEditor) {
((DefaultCellEditor) editor).setClickCountToStart(clickCountToStart);
}
editor = table.getDefaultEditor(Number.class);
if (editor instanceof DefaultCellEditor) {
((DefaultCellEditor) editor).setClickCountToStart(clickCountToStart);
}
editor = table.getDefaultEditor(Boolean.class);
if (editor instanceof DefaultCellEditor) {
((DefaultCellEditor) editor).setClickCountToStart(clickCountToStart);
}
}
}
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