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The DiscoveryLocatorManagement interface defines methods related to the management of the set of LookupLocator objects corresponding to the specific lookup services that are to be discovered using the unicast discovery protocol; that is, lookup services that are discovered by way of locator discovery The methods of this interface define how an entity retrieves or modifies the managed set of locators to discover Phrases such as "the locators to discover" and "discovering the desired locators" refer to the discovery of the lookup services that are associated with those locators The methods that modify the managed set of locators each take a single input parameter: an array of LookupLocator objects, none of whose elements may be null Each of these methods throws a NullPointerException when at least one element of the input array is null Invoking any of these methods with an input array that contains duplicate locators (as determined by LookupLocatorequals) is equivalent to performing the invocation with the duplicates removed from the array The getLocators method returns an array containing the set of LookupLocator objects in the managed set of locators; that is, the locators of the specific lookup services that the implementation object is currently interested in discovering The returned set includes both the set of locators corresponding to lookup services that have already been discovered and the set of those that have not yet been discovered If the managed set is empty, this method returns an empty array This method takes no arguments as input, and returns a new array upon each invocation The addLocators method adds a set of locators to the managed set The array input to this method contains the set of LookupLocator objects to add to the managed set If null is input to addLocators, a NullPointerException will be thrown If an empty array is input, the managed set of locators will not change The setLocators method replaces all of the locators in the managed set with LookupLocator objects from a new set The array input to this method contains the set of LookupLocator objects with which to replace the current locators in the managed set DU2 The Discovery Management Interfaces 172.

public class cellRenderer extends JLabel implements ListCellRenderer { public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean hasFocus) { Person p = (Person)value; //get the person setText(pgetName()); //display name setIcon(pgetIcon()); //and image if(isSelected) setBackground(ColorlightGray ); else setBackground(Colorwhite); return this; } }

NET provides many more components that can be used with WinForms applications, but a survey of all those is beyond the scope of this book

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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition If null is input to setLocators, a NullPointerException will be thrown If an empty array is input to setLocators, then locator discovery will be halted until the managed set of locators is changed through a subsequent call to this method or to addLocators to a set that is nonnull and non empty The removeLocators method deletes a set of locators from the managed set The array input to this method contains the set of LookupLocator objects to remove from the managed set If null is input to removeLocators, a NullPointerException will be thrown If any element of the set of locators to remove is not contained in the managed set, removeLocators takes no action with respect to that element If an empty array is input, the managed set of locators will not change Any already discovered lookup service, corresponding to a locator that is a member of the set of locators removed from the managed set as a result of an invocation of either setLocators or removeLocators, will be discarded and will no longer be eligible for discovery; but only if it is not currently eligible for discovery through other means (such as group discovery) DU26 Supporting Interfaces and Classes Discovery management depends on the interfaces DiscoveryListener and DiscoveryChangeListener, and on the concrete class DiscoveryEvent

WinForms provides several standard dialog components that act as wrappers on the standard dialogs in the Windows shell[2] All the standard print-related components PageSetupDialog, PrintDialog, PrintPreviewDialog, and PrintDocument are covered in 7: Printing

We also connect this cell renderer class to the JList with the following method call:

Because the need for previewing print output is prevalent, WinForms provides a standard PrintPreviewDialog even though the Windows shell does not

The public methods specified by the DiscoveryListener interface are as follows:

nListsetCellRenderer (new cellRenderer());

Figures D2,D3,D4,D5, and D6 show the four remaining standard dialogs as provided by the ColorDialog, FontDialog, OpenFileDialog, SaveFileDialog, and FolderBrowserDialog components

Generally, you're most concerned with the Color property of ColorDialog, the Font property of FontDialog, and the FileName property of OpenFileDialog and SaveFileDialog However, all the dialogs provide other properties you'll want to examine, including the DefaultExt and Filter properties of OpenFileDialog and SaveFileDialog Here's an example of the standard dialog components assuming that each of the components was created by dropping it onto a design surface: // Use the ColorDialog void chooseColor_Click(object sender, EventArgs e) { // Set initial color thiscolorDialog1Color = thisBackColor;

package netjinidiscovery; public interface DiscoveryListener extends EventListener { public void discovered(DiscoveryEvent e); public void discarded(DiscoveryEvent e); }

The resulting display is shown in Figure 316 Figure 316 A sorted list with pictures added via a custom cell renderer

// Ask the user to pick a color if( thiscolorDialog1ShowDialog() == DialogResultOK ) { // Pull out the user's choice thisBackColor = thiscolorDialog1Color; } } // Use the FontDialog void chooseFont_Click(object sender, EventArgs e) { // Set initial font thisfontDialog1Font = thisFont; // Ask the user to pick a font if( thisfontDialog1ShowDialog() == DialogResultOK ) { // Pull out the user's choice thisFont = thisfontDialog1Font; } } // Use the OpenFileDialog (used just like the SaveFileDialog) void chooseFileToOpen_Click(object sender, EventArgs e) { // Set initial file name thisopenFileDialog1FileName = thisfileNameTextBoxText; // Ask the user to pick a file if( thisopenFileDialog1ShowDialog() == DialogResultOK ) { // Pull out the user's choice thisfileNameTextBoxText = thisopenFileDialog1FileName; } } All the standard dialogs, including the print-related dialogs (except for PrintPreviewDialog), are limited to only modal operation via ShowDialog because that's what the shell dialogs support Only PrintPreviewDialog, which is provided in WinForms but not provided in the shell, supports the modeless Show method

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