com.trolltech.qt.xmlpatterns
Class QXmlFormatter
java.lang.Object
com.trolltech.qt.internal.QSignalEmitterInternal
com.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.xmlpatterns.QAbstractXmlReceiver
com.trolltech.qt.xmlpatterns.QXmlSerializer
com.trolltech.qt.xmlpatterns.QXmlFormatter
- All Implemented Interfaces:
- QtJambiInterface, java.lang.Cloneable
public class QXmlFormatter
- extends QXmlSerializer
The QXmlFormatter class is an implementation of QXmlSerializer
for transforming XQuery output into formatted XML. QXmlFormatter is a subclass of QXmlSerializer
that formats the XML output to make it easier for humans to read.
QXmlSerializer
outputs XML without adding unnecessary whitespace. In particular, it does not add newlines and indentation. To make the XML output easier to read, QXmlFormatter adds newlines and indentation by adding, removing, and modifying sequence nodes
that only consist of whitespace. It also modifies whitespace in other places where it is not significant; e.g., between attributes and in the document prologue.
For example, where the base class QXmlSerializer
would output this:
<a><b/><c/><p>Some Text</p></a>
QXmlFormatter outputs this:<a>
<b/>
<c/>
<p>Some Text</p>
</a>
If you just want to serialize your XML in a human-readable format, use QXmlFormatter as it is. The default indentation level is 4 spaces, but you can set your own indentation value setIndentationDepth()
. The newlines and indentation added by QXmlFormatter are suitable for common formats, such as XHTML, SVG, or Docbook, where whitespace is not significant. However, if your XML will be used as input where whitespace is significant, then you must write your own subclass of QXmlSerializer
or QAbstractXmlReceiver
.
Note that using QXmlFormatter instead of QXmlSerializer
will increase computational overhead and document storage size due to the insertion of whitespace.
Note also that the indentation style used by QXmlFormatter remains loosely defined and may change in future versions of Qt. If a specific indentation style is required then either use the base class QXmlSerializer
directly, or write your own subclass of QXmlSerializer
or QAbstractXmlReceiver
. Alternatively, you can subclass QXmlFormatter and reimplement the callbacks there.
QXmlQuery query = new QXmlQuery();
query.setQuery("doc('index.html')/html/body/p[1]");
QXmlFormatterPointer formatter(new QXmlFormatter(query, myOutputDevice));
formatter.setIndentationDepth(2);
query.evaluateToReceiver(formatter);
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9 |
Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal |
Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
currentSender |
Constructor Summary |
QXmlFormatter(QXmlQuery query,
QIODevice outputDevice)
Constructs a formatter that uses the name pool and message handler in query, and writes the result to outputDevice as formatted XML. |
Method Summary |
int |
indentationDepth()
Returns the number of spaces QXmlFormatter will output for each indentation level. |
void |
setIndentationDepth(int depth)
Sets depth to be the number of spaces QXmlFormatter will output for level of indentation. |
Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
__qt_signalInitialization |
Methods inherited from class java.lang.Object |
getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
QXmlFormatter
public QXmlFormatter(QXmlQuery query,
QIODevice outputDevice)
- Constructs a formatter that uses the name pool and message handler in query, and writes the result to outputDevice as formatted XML.
outputDevice is passed directly to QXmlSerializer
's constructor.
- See also:
QXmlSerializer
.
indentationDepth
public final int indentationDepth()
- Returns the number of spaces QXmlFormatter will output for each indentation level. The default is four.
- See also:
setIndentationDepth()
.
setIndentationDepth
public final void setIndentationDepth(int depth)
- Sets depth to be the number of spaces QXmlFormatter will output for level of indentation. The default is four.
- See also:
indentationDepth()
.