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displayStrings[numberDisplayLines++] = indent +
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elem2getText();
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else{
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if(elem2getTagName()equals("INDENTDOUBLE")){
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ind = indent + "
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If the tag is <INDENT>, we set the ind string to the current indentation string plus two spaces: void doTree(Element elem, String indent)
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String ind = "";
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Enumeration enum = elemgetChildren();
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while (enumhasMoreElements()) {
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Element elem2 = (Element)enumnextElement();
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if(elem2getType() != commsxmlElementELEMENT){
int textLength = elem2getText()length();
displayStrings[numberDisplayLines++] = indent + elem2getText();
else{
if(elem2getTagName()equals("INDENTDOUBLE")){
ind = indent + "
if(elem2getTagName()equals("INDENT")){
ind = indent + "
Now that we've filled the new indentation string correctly, we can call doTree() again for the current element: void doTree(Element elem, String indent)
String ind = "";
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
if(elem2getType() != commsxmlElementELEMENT){
int textLength = elem2getText()length();
displayStrings[numberDisplayLines++] = indent + elem2getText();
else{
if(elem2getTagName()equals("INDENTDOUBLE")){
ind = indent + "
if(elem2getTagName()equals("INDENT")){
ind = indent + "
doTree(elem2, ind);
And that's it for doTree() All that remains is to display the strings in the displayStrings[] array in the paint() method That method looks like this: public void paint(Graphics g)
int y = 0;
FontMetrics fontmetrics = getFontMetrics(getFont());
for(int index = 0; index < numberDisplayLines; index++){
y += fontmetricsgetHeight();
gdrawString(displayStrings[index], 0, y);
That's it[md]run the indenter application now, as shown in Figure 43 As you can see in that figure, we present the user with a window holding one button marked Browse
Figure 43 The indenter application When the user clicks the Browse button, the program reads the indenterxml file in and displays that text indented properly, as you see in Figure 44
Figure 44 Indenting an XML document using its tags to format the document To make the action of this program clearer, we might have indenter use xes instead of spaces to indent; the result appears in Figure 45, where we display the formatted indenterxml document
Figure 45 The indenter application using xes
The indenter application is a success[md]now we've added considerable power to our browser applications We've not only started interpreting XML tags, but also have handled mixed content The code for this application, indenterjava, appears in Listing 45 The XML document it reads in, indenterxml, appears in Listing 46 Listing 45 indenterjava import commsxmlParseException;
import commsxmlDocument;
import commsxmlElement;
import javautilEnumeration;
import javaawt*;
import javanet*;
import javaappletApplet;
public class indenter extends Applet{
Button button1;
static String filename;
static String displayStrings[] = new String[100];
static int numberDisplayLines = 0;
public static void main(String args[])
indenterFrame frame = new indenterFrame("The indenter application");
frameshow();
framehide();
frameresize(400, 400);
indenter applet = new indenter();
frameadd("Center", applet);
appletinit();
appletstart();
frameshow();
public void init(){
button1 = new Button("Browse");
add(button1);
public boolean action (Event e, Object o){
URL url = null;
try {
url = new URL("file:////c://xml//indenter//indenter xml");
catch (MalformedURLException e1) {
Systemoutprintln("Cannot create URL for: " + filename);
Systemexit(0);
Document d = new Document();
try {
dload(url);
catch (ParseException e3) {
dreportError(e3, Systemout);
if (d != null) {
doTree(dgetRoot(), "");
repaint();
return true;
void doTree(Element elem, String indent)
String ind = "";
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
if(elem2getType() != commsxmlElementELEMENT){
displayStrings[numberDisplayLines++] = indent + elem2getText();
else{
if(elem2getTagName()equals("INDENTDOUBLE")){
ind = indent + "
if(elem2getTagName()equals("INDENT")){
ind = indent + "
doTree(elem2, ind);
public void paint(Graphics g)
int y = 0;
FontMetrics fontmetrics = getFontMetrics(getFont());
for(int index = 0; index < numberDisplayLines; index++){
y += fontmetricsgetHeight();
gdrawString(displayStrings[index], 0, y);
class indenterFrame extends Frame
public indenterFrame(String str)
super (str);
public boolean handleEvent(Event evt)
switch (evtid)
case EventWINDOW_DESTROY:
dispose();
Systemexit(0);
return true;
default:
return superhandleEvent(evt);
Listing 46 indenterxml < XML VERSION = "10" >
<!DOCTYPE DOCUMENT [
<!ELEMENT DOCUMENT (INDENT|INDENTDOUBLE)*>
<!ELEMENT INDENT (#PCDATA|INDENT|INDENTDOUBLE)*>
<!ELEMENT INDENTDOUBLE (#PCDATA|INDENT|INDENTDOUBLE)*>
<DOCUMENT>
<INDENTDOUBLE>Britta</INDENTDOUBLE>
<INDENTDOUBLE>
<INDENTDOUBLE>
Adam
</INDENTDOUBLE>
<INDENT>
Christina
<INDENTDOUBLE>
<INDENT>Phoebe</INDENT>
<INDENT>Fred</INDENT>
Edward
</INDENTDOUBLE>
</INDENT>
</INDENTDOUBLE>
<INDENT>
Sammy
</INDENT>
</DOCUMENT>
We'll take look at one more example in this chapter[md]the capsjava XML browser, which will capitalize text using XML tags
The caps Example
In this next example, we'll let the user specify the capitalization of text with two new tags: <UPPER> and <LOWER> The <UPPER> tag converts its enclosed text to upper case, and the <LOWER> tag converts its text to lower caseHere's how a document which uses those tags, capsxml, looks: < XML version = "10" >
<!DOCTYPE DOCUMENT [
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