com.trolltech.qt.xml
Class QDomDocument

java.lang.Object
  com.trolltech.qt.internal.QSignalEmitterInternal
      com.trolltech.qt.QSignalEmitter
          com.trolltech.qt.QtJambiObject
              com.trolltech.qt.xml.QDomNode
                  com.trolltech.qt.xml.QDomDocument

All Implemented Interfaces:

QtJambiInterface, java.lang.Cloneable

public class QDomDocument
extends QDomNode
implements java.lang.Cloneable

The QDomDocument class represents an XML document. The QDomDocument class represents the entire XML document. Conceptually, it is the root of the document tree, and provides the primary access to the document's data.

Since elements, text nodes, comments, processing instructions, etc., cannot exist outside the context of a document, the document class also contains the factory functions needed to create these objects. The node objects created have an ownerDocument() function which associates them with the document within whose context they were created. The DOM classes that will be used most often are QDomNode, QDomDocument, QDomElement and QDomText.

The parsed XML is represented internally by a tree of objects that can be accessed using the various QDom classes. All QDom classes only reference objects in the internal tree. The internal objects in the DOM tree will get deleted once the last QDom object referencing them and the QDomDocument itself are deleted.

Creation of elements, text nodes, etc. is done using the various factory functions provided in this class. Using the default constructors of the QDom classes will only result in empty objects that cannot be manipulated or inserted into the Document.

The QDomDocument class has several functions for creating document data, for example, createElement(), createTextNode(), createComment(), createCDATASection(), createProcessingInstruction(), createAttribute() and createEntityReference(). Some of these functions have versions that support namespaces, i.e. createElementNS() and createAttributeNS(). The createDocumentFragment() function is used to hold parts of the document; this is useful for manipulating for complex documents.

The entire content of the document is set with setContent(). This function parses the string it is passed as an XML document and creates the DOM tree that represents the document. The root element is available using documentElement(). The textual representation of the document can be obtained using toString().

It is possible to insert a node from another document into the document using importNode().

You can obtain a list of all the elements that have a particular tag with elementsByTagName() or with elementsByTagNameNS().

The QDom classes are typically used as follows:

    QDomDocument domDoc = new QDomDocument("mydocument");
    QFile file = new QFile("mydocument.xml");
    QFile.OpenMode mode = new QFile.OpenMode();
    mode.set(QFile.OpenModeFlag.ReadOnly);

    if (!file.open(mode))
        return;
    if (!domDoc.setContent(file).success) {
        file.close();
        return;
    }
    file.close();

    // print out the element names of all elements that are direct children
    // of the outermost element.
    QDomElement docElem = doc.documentElement();

    QDomNode domNode = docElem.firstChild();
    while(!domNode.isNull()) {
        QDomElement e = domNode.toElement(); // try to convert the node to an element.
        if(!e.isNull()) {
            System.out.println(e.tagName()); // the node really is an element.
        }
        domNode = domNode.nextSibling();
    }

    // Here we append a new element to the end of the document
    QDomElement elem = doc.createElement("img");
    elem.setAttribute("src", "myimage.png");
    docElem.appendChild(elem);

Once doc and elem go out of scope, the whole internal tree representing the XML document is deleted.

To create a document using DOM use code like this:

    QDomDocument doc = new QDomDocument("MyML");
    QDomElement root = doc.createElement("MyML");
    doc.appendChild(root);

    QDomElement tag = doc.createElement("Greeting");
    root.appendChild(tag);

    QDomText t = doc.createTextNode("Hello World");
    tag.appendChild(t);

    java.lang.String xml = doc.toString();

For further information about the Document Object Model see the Document Object Model (DOM) Level 1 and Level 2 Core Specifications.

See also:

DOM Bookmarks Example, and Simple DOM Model Example.

Nested Class Summary

class

QDomDocument.Result

Nested classes/interfaces inherited from class com.trolltech.qt.xml.QDomNode

QDomNode.EncodingPolicy, QDomNode.NodeType

Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter

QSignalEmitter.AbstractSignal, QSignalEmitter.PrivateSignal0, QSignalEmitter.PrivateSignal1, QSignalEmitter.PrivateSignal2, QSignalEmitter.PrivateSignal3, QSignalEmitter.PrivateSignal4, QSignalEmitter.PrivateSignal5, QSignalEmitter.PrivateSignal6, QSignalEmitter.PrivateSignal7, QSignalEmitter.PrivateSignal8, QSignalEmitter.PrivateSignal9, 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

Field Summary

Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal

currentSender

Constructor Summary

QDomDocument()
Constructs an empty document.

QDomDocument(QDomDocument x)
Constructs a copy of x.

QDomDocument(QDomDocumentType doctype)
Creates a document with the document type doctype.

QDomDocument(java.lang.String name)
Creates a document and sets the name of the document type to name.

Method Summary

QDomDocument	clone() This method is reimplemented for internal reasons
QDomAttr	createAttribute(java.lang.String name) Creates a new attribute called name that can be inserted into an element, e.
QDomAttr	createAttributeNS(java.lang.String nsURI, java.lang.String qName) Creates a new attribute with namespace support that can be inserted into an element.
QDomCDATASection	createCDATASection(java.lang.String data) Creates a new CDATA section for the string value that can be inserted into the document, e.
QDomComment	createComment(java.lang.String data) Creates a new comment for the string value that can be inserted into the document, e.
QDomDocumentFragment	createDocumentFragment() Creates a new document fragment, that can be used to hold parts of the document, e.g.
QDomElement	createElement(java.lang.String tagName) Creates a new element called tagName that can be inserted into the DOM tree, e.
QDomElement	createElementNS(java.lang.String nsURI, java.lang.String qName) Creates a new element with namespace support that can be inserted into the DOM tree.
QDomEntityReference	createEntityReference(java.lang.String name) Creates a new entity reference called name that can be inserted into the document, e.
QDomProcessingInstruction	createProcessingInstruction(java.lang.String target, java.lang.String data) Creates a new processing instruction that can be inserted into the document, e.
QDomText	createTextNode(java.lang.String data) Creates a text node for the string value that can be inserted into the document tree, e.
QDomDocumentType	doctype() Returns the document type of this document.
QDomElement	documentElement() Returns the root element of the document.
QDomElement	elementById(java.lang.String elementId) Returns the element whose ID is equal to elementId.
QDomNodeList	elementsByTagName(java.lang.String tagname) Returns a QDomNodeList, that contains all the elements in the document with the name tagname.
QDomNodeList	elementsByTagNameNS(java.lang.String nsURI, java.lang.String localName) Returns a QDomNodeList that contains all the elements in the document with the local name localName and a namespace URI of nsURI.
QDomImplementation	implementation() Returns a QDomImplementation object.
QDomNode	importNode(QDomNode importedNode, boolean deep) Imports the node importedNode from another document to this document.
QDomDocument.Result	setContent(QByteArray buffer) This is an overloaded method provided for convenience.
QDomDocument.Result	setContent(QByteArray text, boolean namespaceProcessing) This function reads the XML document from the byte array text, returning true if the content was successfully parsed; otherwise returns false.
QDomDocument.Result	setContent(QIODevice dev) This is an overloaded method provided for convenience.
QDomDocument.Result	setContent(QIODevice dev, boolean namespaceProcessing) This function reads the XML document from the IO device dev, returning true if the content was successfully parsed; otherwise returns false.
QDomDocument.Result	setContent(QXmlInputSource source, boolean namespaceProcessing) This is an overloaded method provided for convenience.
QDomDocument.Result	setContent(QXmlInputSource source, QXmlReader reader) This function reads the XML document from the QXmlInputSource source and parses it with the QXmlReader reader, returning true if the content was successfully parsed; otherwise returns false.
QDomDocument.Result	setContent(java.lang.String text) This is an overloaded method provided for convenience.
QDomDocument.Result	setContent(java.lang.String text, boolean namespaceProcessing) This function reads the XML document from the string text, returning true if the content was successfully parsed; otherwise returns false.
QByteArray	toByteArray() Converts the parsed document back to its textual representation and returns a QByteArray containing the data encoded as UTF-8.
QByteArray	toByteArray(int arg__1) Converts the parsed document back to its textual representation and returns a QByteArray containing the data encoded as UTF-8.
java.lang.String	toString() Returns a string representation of the this QDomDocument.
java.lang.String	toString(int arg__1) Returns a string representation of the int argument.

Methods inherited from class com.trolltech.qt.xml.QDomNode

appendChild, childNodes, clear, cloneNode, cloneNode, columnNumber, firstChild, firstChildElement, firstChildElement, hasAttributes, hasChildNodes, insertAfter, insertBefore, isAttr, isCDATASection, isCharacterData, isComment, isDocument, isDocumentFragment, isDocumentType, isElement, isEntity, isEntityReference, isNotation, isNull, isProcessingInstruction, isSupported, isText, lastChild, lastChildElement, lastChildElement, lineNumber, localName, namedItem, namespaceURI, nextSibling, nextSiblingElement, nextSiblingElement, nodeName, nodeType, nodeValue, normalize, ownerDocument, parentNode, prefix, previousSibling, previousSiblingElement, previousSiblingElement, removeChild, replaceChild, save, save, setNodeValue, setPrefix, toAttr, toCDATASection, toCharacterData, toComment, toDocument, toDocumentFragment, toDocumentType, toElement, toEntity, toEntityReference, toNotation, toProcessingInstruction, toText, writeTo

Methods inherited from class com.trolltech.qt.QtJambiObject

dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr

Methods inherited from class com.trolltech.qt.QSignalEmitter

blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread

Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal

__qt_signalInitialization

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.trolltech.qt.QtJambiInterface

disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership

Constructor Detail

QDomDocument

public QDomDocument()

Constructs an empty document.

QDomDocument

public QDomDocument(QDomDocument 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().

QDomDocument

public QDomDocument(QDomDocumentType doctype)

Creates a document with the document type doctype.

See also:

QDomImplementation::createDocumentType().

QDomDocument

public QDomDocument(java.lang.String name)

Creates a document and sets the name of the document type to name.

Method Detail

createAttribute

public final QDomAttr createAttribute(java.lang.String name)

Creates a new attribute called name that can be inserted into an element, e. . using QDomElement::setAttributeNode().

If name is not a valid XML name, the behavior of this function is governed by QDomImplementation::InvalidDataPolicy .

See also:

createAttributeNS().

createAttributeNS

public final QDomAttr createAttributeNS(java.lang.String nsURI,
                                        java.lang.String qName)

Creates a new attribute with namespace support that can be inserted into an element. The name of the attribute is qName and the namespace URI is nsURI. This function also sets QDomNode::prefix() and QDomNode::localName() to appropriate values (depending on qName).

If qName is not a valid XML name, the behavior of this function is governed by QDomImplementation::InvalidDataPolicy .

See also:

createAttribute().

createCDATASection

public final QDomCDATASection createCDATASection(java.lang.String data)

Creates a new CDATA section for the string value that can be inserted into the document, e. . using QDomNode::appendChild().

If value contains characters which cannot be stored in a CDATA section, the behavior of this function is governed by QDomImplementation::InvalidDataPolicy .

See also:

QDomNode::appendChild(), QDomNode::insertBefore(), and QDomNode::insertAfter().

createComment

public final QDomComment createComment(java.lang.String data)

Creates a new comment for the string value that can be inserted into the document, e. . using QDomNode::appendChild().

If value contains characters which cannot be stored in an XML comment, the behavior of this function is governed by QDomImplementation::InvalidDataPolicy .

See also:

QDomNode::appendChild(), QDomNode::insertBefore(), and QDomNode::insertAfter().

createDocumentFragment

public final QDomDocumentFragment createDocumentFragment()

Creates a new document fragment, that can be used to hold parts of the document, e.g. when doing complex manipulations of the document tree.

createElement

public final QDomElement createElement(java.lang.String tagName)

Creates a new element called tagName that can be inserted into the DOM tree, e. . using QDomNode::appendChild().

If tagName is not a valid XML name, the behavior of this function is governed by QDomImplementation::InvalidDataPolicy .

QDomNode::insertAfter()

See also:

createElementNS(), QDomNode::appendChild(), and QDomNode::insertBefore().

createElementNS

public final QDomElement createElementNS(java.lang.String nsURI,
                                         java.lang.String qName)

Creates a new element with namespace support that can be inserted into the DOM tree. The name of the element is qName and the namespace URI is nsURI. This function also sets QDomNode::prefix() and QDomNode::localName() to appropriate values (depending on qName).

If qName is an empty string, returns a null element regardless of whether the invalid data policy is set.

See also:

createElement().

createEntityReference

public final QDomEntityReference createEntityReference(java.lang.String name)

Creates a new entity reference called name that can be inserted into the document, e. . using QDomNode::appendChild().

If name is not a valid XML name, the behavior of this function is governed by QDomImplementation::InvalidDataPolicy .

See also:

QDomNode::appendChild(), QDomNode::insertBefore(), and QDomNode::insertAfter().

createProcessingInstruction

public final QDomProcessingInstruction createProcessingInstruction(java.lang.String target,
                                                                   java.lang.String data)

Creates a new processing instruction that can be inserted into the document, e. . using QDomNode::appendChild(). This function sets the target for the processing instruction to target and the data to data.

If target is not a valid XML name, or data if contains characters which cannot appear in a processing instruction, the behavior of this function is governed by QDomImplementation::InvalidDataPolicy .

See also:

QDomNode::appendChild(), QDomNode::insertBefore(), and QDomNode::insertAfter().

createTextNode

public final QDomText createTextNode(java.lang.String data)

Creates a text node for the string value that can be inserted into the document tree, e. . using QDomNode::appendChild().

If value contains characters which cannot be stored as character data of an XML document (even in the form of character references), the behavior of this function is governed by QDomImplementation::InvalidDataPolicy .

See also:

QDomNode::appendChild(), QDomNode::insertBefore(), and QDomNode::insertAfter().

doctype

public final QDomDocumentType doctype()

Returns the document type of this document.

documentElement

public final QDomElement documentElement()

Returns the root element of the document.

elementById

public final QDomElement elementById(java.lang.String elementId)

Returns the element whose ID is equal to elementId. If no element with the ID was found, this function returns a null element.

Since the QDomClasses do not know which attributes are element IDs, this function returns always a null element. This may change in a future version.

elementsByTagName

public final QDomNodeList elementsByTagName(java.lang.String tagname)

Returns a QDomNodeList, that contains all the elements in the document with the name tagname. The order of the node list is the order they are encountered in a preorder traversal of the element tree.

See also:

elementsByTagNameNS(), and QDomElement::elementsByTagName().

elementsByTagNameNS

public final QDomNodeList elementsByTagNameNS(java.lang.String nsURI,
                                              java.lang.String localName)

Returns a QDomNodeList that contains all the elements in the document with the local name localName and a namespace URI of nsURI. The order of the node list is the order they are encountered in a preorder traversal of the element tree.

See also:

elementsByTagName(), and QDomElement::elementsByTagNameNS().

implementation

public final QDomImplementation implementation()

Returns a QDomImplementation object.

importNode

public final QDomNode importNode(QDomNode importedNode,
                                 boolean deep)

Imports the node importedNode from another document to this document. importedNode remains in the original document; this function creates a copy that can be used within this document.

This function returns the imported node that belongs to this document. The returned node has no parent. It is not possible to import QDomDocument and QDomDocumentType nodes. In those cases this function returns a null node.

If deep is true, this function imports not only the node importedNode but its whole subtree; if it is false, only the importedNode is imported. The argument deep has no effect on QDomAttr and QDomEntityReference nodes, since the descendants of QDomAttr nodes are always imported and those of QDomEntityReference nodes are never imported.

The behavior of this function is slightly different depending on the node types:

Node Type	Behavior
QDomAttr	The owner element is set to 0 and the specified flag is set to true in the generated attribute. The whole subtree of importedNode is always imported for attribute nodes: deep has no effect.
QDomDocument	Document nodes cannot be imported.
QDomDocumentFragment	If deep is true, this function imports the whole document fragment; otherwise it only generates an empty document fragment.
QDomDocumentType	Document type nodes cannot be imported.
QDomElement	Attributes for which QDomAttr::specified() is true are also imported, other attributes are not imported. If deep is true, this function also imports the subtree of importedNode; otherwise it imports only the element node (and some attributes, see above).
QDomEntity	Entity nodes can be imported, but at the moment there is no way to use them since the document type is read-only in DOM level 2.
QDomEntityReference	Descendants of entity reference nodes are never imported: deep has no effect.
QDomNotation	Notation nodes can be imported, but at the moment there is no way to use them since the document type is read-only in DOM level 2.
QDomProcessingInstruction	The target and value of the processing instruction is copied to the new node.
QDomText	The text is copied to the new node.
QDomCDATASection	The text is copied to the new node.
QDomComment	The text is copied to the new node.

QDomNode::insertAfter()QDomNode::replaceChild()QDomNode::removeChild()QDomNode::appendChild()

See also:

QDomElement::setAttribute(), and QDomNode::insertBefore().

toByteArray

public final QByteArray toByteArray()

Converts the parsed document back to its textual representation and returns a QByteArray containing the data encoded as UTF-8.

This function uses indent as the amount of space to indent subelements.

See also:

toString().

toByteArray

public final QByteArray toByteArray(int arg__1)

Converts the parsed document back to its textual representation and returns a QByteArray containing the data encoded as UTF-8.

This function uses indent as the amount of space to indent subelements.

See also:

toString().

toString

public final java.lang.String toString()

Returns a string representation of the this QDomDocument.

Overrides:

toString in class java.lang.Object

toString

public final java.lang.String toString(int arg__1)

Returns a string representation of the int argument.

setContent

public final QDomDocument.Result setContent(QXmlInputSource source,
                                            boolean namespaceProcessing)

This is an overloaded method provided for convenience.

setContent

public final QDomDocument.Result setContent(QIODevice dev,
                                            boolean namespaceProcessing)

This function reads the XML document from the IO device dev, returning true if the content was successfully parsed; otherwise returns false.

If namespaceProcessing is true, the parser recognizes namespaces in the XML file and sets the prefix name, local name and namespace URI to appropriate values. If namespaceProcessing is false, the parser does no namespace processing when it reads the XML file.

setContent

public final QDomDocument.Result setContent(QByteArray text,
                                            boolean namespaceProcessing)

This function reads the XML document from the byte array text, returning true if the content was successfully parsed; otherwise returns false.

If namespaceProcessing is true, the parser recognizes namespaces in the XML file and sets the prefix name, local name and namespace URI to appropriate values. If namespaceProcessing is false, the parser does no namespace processing when it reads the XML file.

setContent

public final QDomDocument.Result setContent(java.lang.String text,
                                            boolean namespaceProcessing)

This function reads the XML document from the string text, returning true if the content was successfully parsed; otherwise returns false. Since text is already a Unicode string, no encoding detection is performed.

If namespaceProcessing is true, the parser recognizes namespaces in the XML file and sets the prefix name, local name and namespace URI to appropriate values. If namespaceProcessing is false, the parser does no namespace processing when it reads the XML file.

setContent

public final QDomDocument.Result setContent(QXmlInputSource source,
                                            QXmlReader reader)

This function reads the XML document from the QXmlInputSource source and parses it with the QXmlReader reader, returning true if the content was successfully parsed; otherwise returns false.

This function doesn't change the features of the reader. If you want to use certain features for parsing you can use this function to set up the reader appropriately.

setContent

public final QDomDocument.Result setContent(java.lang.String text)

This is an overloaded method provided for convenience.

setContent

public final QDomDocument.Result setContent(QByteArray buffer)

This is an overloaded method provided for convenience.

setContent

public final QDomDocument.Result setContent(QIODevice dev)

This is an overloaded method provided for convenience.

clone

public QDomDocument clone()

This method is reimplemented for internal reasons

Overrides:

clone in class QDomNode