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java.lang.Objectcom.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.xml.QDomNode
com.trolltech.qt.xml.QDomElement
public class QDomElement
The QDomElement class represents one element in the DOM tree.
Elements have a tagName and zero or more attributes associated with them. The tag name can be changed with setTagName.
Element attributes are represented by QDomAttr objects that can be queried using the attribute and attributeNode functions. You can set attributes with the setAttribute and setAttributeNode functions. Attributes can be removed with removeAttribute. There are namespace-aware equivalents to these functions, i.e. setAttributeNS, setAttributeNodeNS and removeAttributeNS.
If you want to access the text of a node use text, e.g.
QDomElement e = //... //... QString s = e.text()
The text function operates recursively to find the text (since not all elements contain text). If you want to find all the text in all of a node's children, iterate over the children looking for QDomText nodes, e.g.
QString text; QDomElement element = doc.documentElement(); for(QDomNode n = element.firstChild(); !n.isNull(); n = n.nextSibling()) { QDomText t = n.toText(); if (!t.isNull()) text += t.data(); }
Note that we attempt to convert each node to a text node and use text rather than using firstChild.toText.data() or n.toText.data() directly on the node, because the node may not be a text element.
You can get a list of all the decendents of an element which have a specified tag name with elementsByTagName or elementsByTagNameNS.
To browse the elements of a dom document use firstChildElement, lastChildElement, nextSiblingElement and previousSiblingElement. For example, to iterate over all child elements called "entry" in a root element called "database", you can use:
QDomDocument doc = // ... QDomElement root = doc.firstChildElement("database"); QDomElement elt = root.firstChildElement("entry"); for (; !elt.isNull(); elt = elt.nextSiblingElelement("entry")) { // ... }
For further information about the Document Object Model see Level 1 and Level 2 Core. For a more general introduction of the DOM implementation see the QDomDocument documentation.
Nested Class Summary |
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Nested classes/interfaces inherited from class com.trolltech.qt.xml.QDomNode |
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QDomNode.EncodingPolicy, QDomNode.NodeType |
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
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QSignalEmitter.Signal0, QSignalEmitter.Signal1<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I> |
Constructor Summary | |
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QDomElement()
Constructs an empty element. |
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QDomElement(QDomElement x)
Constructs a copy of x. |
Method Summary | |
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java.lang.String |
attribute(java.lang.String name)
Equivalent to attribute(name, QString()). |
java.lang.String |
attribute(java.lang.String name,
java.lang.String defValue)
Returns the attribute called name. |
QDomAttr |
attributeNode(java.lang.String name)
Returns the QDomAttr object that corresponds to the attribute called name. |
QDomAttr |
attributeNodeNS(java.lang.String nsURI,
java.lang.String localName)
Returns the QDomAttr object that corresponds to the attribute with the local name localName and the namespace URI nsURI. |
java.lang.String |
attributeNS(java.lang.String nsURI,
java.lang.String localName)
Equivalent to attributeNS(nsURI, localName, QString()). |
java.lang.String |
attributeNS(java.lang.String nsURI,
java.lang.String localName,
java.lang.String defValue)
Returns the attribute with the local name localName and the namespace URI nsURI. |
QDomNamedNodeMap |
attributes()
Returns a QDomNamedNodeMap containing all this element's attributes. |
QDomNodeList |
elementsByTagName(java.lang.String tagname)
Returns a QDomNodeList containing all descendent elements of this element that are called tagname. |
QDomNodeList |
elementsByTagNameNS(java.lang.String nsURI,
java.lang.String localName)
Returns a QDomNodeList containing all the descendent elements of this element with the local name localName and the namespace URI nsURI. |
static QDomElement |
fromNativePointer(QNativePointer nativePointer)
This function returns the QDomElement instance pointed to by nativePointer |
boolean |
hasAttribute(java.lang.String name)
Returns true if this element has an attribute called name; otherwise returns false. |
boolean |
hasAttributeNS(java.lang.String nsURI,
java.lang.String localName)
Returns true if this element has an attribute with the local name localName and the namespace URI nsURI; otherwise returns false. |
static QNativePointer |
nativePointerArray(QDomElement[] array)
This function returns a QNativePointer that is pointing to the specified QDomElement array. |
void |
removeAttribute(java.lang.String name)
Removes the attribute called name name from this element. |
QDomAttr |
removeAttributeNode(QDomAttr oldAttr)
Removes the attribute oldAttr from the element and returns it. |
void |
removeAttributeNS(java.lang.String nsURI,
java.lang.String localName)
Removes the attribute with the local name localName and the namespace URI nsURI from this element. |
void |
setAttribute(java.lang.String name,
double value)
This is an overloaded method provided for convenience. |
void |
setAttribute(java.lang.String name,
float value)
This is an overloaded method provided for convenience. |
void |
setAttribute(java.lang.String name,
int value)
This is an overloaded method provided for convenience. |
void |
setAttribute(java.lang.String name,
long value)
This is an overloaded method provided for convenience. |
void |
setAttribute(java.lang.String name,
java.lang.String value)
Adds an attribute called name with value value. |
QDomAttr |
setAttributeNode(QDomAttr newAttr)
Adds the attribute newAttr to this element. |
QDomAttr |
setAttributeNodeNS(QDomAttr newAttr)
Adds the attribute newAttr to this element. |
void |
setAttributeNS(java.lang.String nsURI,
java.lang.String qName,
double value)
This is an overloaded method provided for convenience. |
void |
setAttributeNS(java.lang.String nsURI,
java.lang.String qName,
int value)
This is an overloaded method provided for convenience. |
void |
setAttributeNS(java.lang.String nsURI,
java.lang.String qName,
long value)
This is an overloaded method provided for convenience. |
void |
setAttributeNS(java.lang.String nsURI,
java.lang.String qName,
java.lang.String value)
Adds an attribute with the qualified name qName and the namespace URI nsURI with the value value. |
void |
setTagName(java.lang.String name)
Sets this element's tag name to name. |
java.lang.String |
tagName()
Returns the tag name of this element. |
java.lang.String |
text()
Returns the element's text or an empty string. |
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
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blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread |
Methods inherited from class java.lang.Object |
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clone, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Constructor Detail |
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public QDomElement()
Constructs an empty element. Use the QDomDocument::createElement() function to construct elements with content.
public QDomElement(QDomElement x)
Constructs a copy of x.
The data of the copy is shared (shallow copy): modifying one node will also change the other. If you want to make a deep copy, use cloneNode.
Method Detail |
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public final java.lang.String attribute(java.lang.String name)
Equivalent to attribute(name, QString()).
public final java.lang.String attribute(java.lang.String name, java.lang.String defValue)
Returns the attribute called name. If the attribute does not exist defValue is returned.
public final java.lang.String attributeNS(java.lang.String nsURI, java.lang.String localName)
Equivalent to attributeNS(nsURI, localName, QString()).
public final java.lang.String attributeNS(java.lang.String nsURI, java.lang.String localName, java.lang.String defValue)
Returns the attribute with the local name localName and the namespace URI nsURI. If the attribute does not exist defValue is returned.
public final QDomAttr attributeNode(java.lang.String name)
Returns the QDomAttr object that corresponds to the attribute called name. If no such attribute exists a null attribute is returned.
public final QDomAttr attributeNodeNS(java.lang.String nsURI, java.lang.String localName)
Returns the QDomAttr object that corresponds to the attribute with the local name localName and the namespace URI nsURI. If no such attribute exists a null attribute is returned.
public final QDomNamedNodeMap attributes()
Returns a QDomNamedNodeMap containing all this element's attributes.
public final QDomNodeList elementsByTagName(java.lang.String tagname)
Returns a QDomNodeList containing all descendent elements of this element that are called tagname. The order they are in the node list is the order they are encountered in a preorder traversal of the element tree.
public final QDomNodeList elementsByTagNameNS(java.lang.String nsURI, java.lang.String localName)
Returns a QDomNodeList containing all the descendent elements of this element with the local name localName and the namespace URI nsURI. The order they are in the node list is the order they are encountered in a preorder traversal of the element tree.
public final boolean hasAttribute(java.lang.String name)
Returns true if this element has an attribute called name; otherwise returns false.
Note: This function does not take the presence of namespaces into account. As a result, the specified name will be tested against fully-qualified attribute names that include any namespace prefixes that may be present.
Use hasAttributeNS to explicitly test for attributes with specific namespaces and names.
public final boolean hasAttributeNS(java.lang.String nsURI, java.lang.String localName)
Returns true if this element has an attribute with the local name localName and the namespace URI nsURI; otherwise returns false.
public final void removeAttribute(java.lang.String name)
Removes the attribute called name name from this element.
public final void removeAttributeNS(java.lang.String nsURI, java.lang.String localName)
Removes the attribute with the local name localName and the namespace URI nsURI from this element.
public final QDomAttr removeAttributeNode(QDomAttr oldAttr)
Removes the attribute oldAttr from the element and returns it.
public final void setAttribute(java.lang.String name, java.lang.String value)
Adds an attribute called name with value value. If an attribute with the same name exists, its value is replaced by value.
public final void setAttribute(java.lang.String name, int value)
public final void setAttribute(java.lang.String name, double value)
public final void setAttribute(java.lang.String name, float value)
public final void setAttribute(java.lang.String name, long value)
public final void setAttributeNS(java.lang.String nsURI, java.lang.String qName, double value)
public final void setAttributeNS(java.lang.String nsURI, java.lang.String qName, int value)
public final void setAttributeNS(java.lang.String nsURI, java.lang.String qName, long value)
public final void setAttributeNS(java.lang.String nsURI, java.lang.String qName, java.lang.String value)
Adds an attribute with the qualified name qName and the namespace URI nsURI with the value value. If an attribute with the same local name and namespace URI exists, its prefix is replaced by the prefix of qName and its value is repaced by value.
Although qName is the qualified name, the local name is used to decide if an existing attribute's value should be replaced.
public final QDomAttr setAttributeNode(QDomAttr newAttr)
Adds the attribute newAttr to this element.
If the element has another attribute that has the same name as newAttr, this function replaces that attribute and returns it; otherwise the function returns a null attribute.
public final QDomAttr setAttributeNodeNS(QDomAttr newAttr)
Adds the attribute newAttr to this element.
If the element has another attribute that has the same local name and namespace URI as newAttr, this function replaces that attribute and returns it; otherwise the function returns a null attribute.
public final void setTagName(java.lang.String name)
Sets this element's tag name to name.
public final java.lang.String tagName()
Returns the tag name of this element. For an XML element like this:
<img src="myimg.png">
the tagname would return "img".
public final java.lang.String text()
Returns the element's text or an empty string.
Example:
<h1>Hello <b>Qt</b> <![CDATA[<xml is cool>]]></h1>
The function text of the QDomElement for the <h1> tag, will return the following text:
Hello Qt <xml is cool>
Comments are ignored by this function. It only evaluates QDomText and QDomCDATASection objects.
public static QDomElement fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.public static QNativePointer nativePointerArray(QDomElement[] array)
array
- the array that the returned pointer will point to.
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