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package edu.ucsb.cs.nws.nwsprotocol;
import java.awt.*;
import java.util.*;
/**
* The NwsObjectList class is a List component for NWS name server objects.
* Objects are entered in the list in sorted order, and elision of duplicate
* attributes values can be used to tidy the display.
*/
public class NwsObjectList extends java.awt.List {
/**
* Produces a NwsObjectList with <i>rows</i> visible entries that shows the
* values of each of the attribute named in <i>displayAttributes</i>. If
* <i>multipleMode</i> is true, the user is allowed to choose multiple
* items from the list. If <i>elide</i> is true, duplicated attribute
* values in the display are replace by elipses.
*/
public NwsObjectList(int rows,
boolean multipleMode,
String[] displayAttributes,
boolean elide) {
super(rows, multipleMode);
this.displayAttributes = displayAttributes;
this.elide = elide;
}
/** Adds a new object with the specified attributes to the list. */
public void add(NwsNameServer.Attribute[] nwsObject) {
String display = getDisplay(nwsObject);
int i;
String oldDisplay = "";
/* Find where to insert the item (in sorted order). */
for(i = 0; i < getItemCount(); i++) {
oldDisplay = getDisplay(getAttributes(i));
if(oldDisplay.compareTo(display) > 0)
break;
}
if(elide) {
if(i < getItemCount()) {
remove(i);
add(getElidedDisplay(oldDisplay, display), i);
}
if(i > 0)
display = getElidedDisplay(display, getDisplay(getAttributes(i - 1)));
}
add(display, i);
entries.insertElementAt(nwsObject, i);
}
/** Deselects every element of the list. */
public void deselectAll() {
int[] selected = getSelectedIndexes();
for(int i = 0; i < selected.length; i++)
deselect(selected[i]);
}
/** Returns the attributes associated with the <i>index</i>th list entry. */
public NwsNameServer.Attribute[] getAttributes(int index) {
return (NwsNameServer.Attribute[])entries.elementAt(index);
}
/**
* Given two returnValues from <i>getDisplay()</i>, returns <i>display</i>
* with any leading components that duplicate those in <i>prior</i>
* replaced with elipses.
*/
protected static String getElidedDisplay(String display,
String prior) {
int substringStart = 0;
String returnValue = "";
for(int dashPlace = prior.indexOf("-");
dashPlace != -1;
dashPlace = prior.indexOf("-", substringStart)) {
if(!display.regionMatches(0, prior, 0, dashPlace))
break;
returnValue = returnValue + "...-";
substringStart = dashPlace + 1;
}
return returnValue + display.substring(substringStart);
}
/** Returns the string to add to the list to represent <i>nwsObject</i>. */
protected String getDisplay(NwsNameServer.Attribute[] nwsObject) {
String returnValue = "";
String separator = "";
String value;
for(int i = 0; i < displayAttributes.length; i++) {
value = NwsNameServer.getAttributeValue(nwsObject,displayAttributes[i]);
if(value != null) {
returnValue = returnValue + separator + value;
separator = "-";
}
}
return returnValue;
}
String[] displayAttributes;
boolean elide;
Vector entries = new Vector();
}
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