#ifndef DOMWriter_HEADER_GUARD_
#define DOMWriter_HEADER_GUARD_
/*
* Copyright 2002,2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: DOMWriter.hpp 231323 2005-08-10 20:58:40Z cargilld $
*/
/**
*
* DOMWriter provides an API for serializing (writing) a DOM document out in
* an XML document. The XML data is written to an output stream, the type of
* which depends on the specific language bindings in use. During
* serialization of XML data, namespace fixup is done when possible.
* <p> <code>DOMWriter</code> accepts any node type for serialization. For
* nodes of type <code>Document</code> or <code>Entity</code>, well formed
* XML will be created if possible. The serialized output for these node
* types is either as a Document or an External Entity, respectively, and is
* acceptable input for an XML parser. For all other types of nodes the
* serialized form is not specified, but should be something useful to a
* human for debugging or diagnostic purposes. Note: rigorously designing an
* external (source) form for stand-alone node types that don't already have
* one defined in seems a bit much to take on here.
* <p>Within a Document or Entity being serialized, Nodes are processed as
* follows Documents are written including an XML declaration and a DTD
* subset, if one exists in the DOM. Writing a document node serializes the
* entire document. Entity nodes, when written directly by
* <code>writeNode</code> defined in the <code>DOMWriter</code> interface,
* output the entity expansion but no namespace fixup is done. The resulting
* output will be valid as an external entity. Entity References nodes are
* serializes as an entity reference of the form
* <code>"&entityName;"</code>) in the output. Child nodes (the
* expansion) of the entity reference are ignored. CDATA sections
* containing content characters that can not be represented in the
* specified output encoding are handled according to the
* "split-cdata-sections" feature.If the feature is <code>true</code>, CDATA
* sections are split, and the unrepresentable characters are serialized as
* numeric character references in ordinary content. The exact position and
* number of splits is not specified. If the feature is <code>false</code>,
* unrepresentable characters in a CDATA section are reported as errors. The
* error is not recoverable - there is no mechanism for supplying
* alternative characters and continuing with the serialization. All other
* node types (DOMElement, DOMText, etc.) are serialized to their corresponding
* XML source form.
* <p> Within the character data of a document (outside of markup), any
* characters that cannot be represented directly are replaced with
* character references. Occurrences of '<' and '&' are replaced by
* the predefined entities &lt; and &amp. The other predefined
* entities (&gt, &apos, etc.) are not used; these characters can be
* included directly. Any character that can not be represented directly in
* the output character encoding is serialized as a numeric character
* reference.
* <p> Attributes not containing quotes are serialized in quotes. Attributes
* containing quotes but no apostrophes are serialized in apostrophes
* (single quotes). Attributes containing both forms of quotes are
* serialized in quotes, with quotes within the value represented by the
* predefined entity &quot;. Any character that can not be represented
* directly in the output character encoding is serialized as a numeric
* character reference.
* <p> Within markup, but outside of attributes, any occurrence of a character
* that cannot be represented in the output character encoding is reported
* as an error. An example would be serializing the element
* <LaCa�ada/> with the encoding="us-ascii".
* <p> When requested by setting the <code>normalize-characters</code> feature
* on <code>DOMWriter</code>, all data to be serialized, both markup and
* character data, is W3C Text normalized according to the rules defined in
* . The W3C Text normalization process affects only the data as it is being
* written; it does not alter the DOM's view of the document after
* serialization has completed.
* <p>Namespaces are fixed up during serialization, the serialization process
* will verify that namespace declarations, namespace prefixes and the
* namespace URIs associated with Elements and Attributes are consistent. If
* inconsistencies are found, the serialized form of the document will be
* altered to remove them. The algorithm used for doing the namespace fixup
* while seralizing a document is a combination of the algorithms used for
* lookupNamespaceURI and lookupNamespacePrefix . previous paragraph to be
* defined closer here.
* <p>Any changes made affect only the namespace prefixes and declarations
* appearing in the serialized data. The DOM's view of the document is not
* altered by the serialization operation, and does not reflect any changes
* made to namespace declarations or prefixes in the serialized output.
* <p> While serializing a document the serializer will write out
* non-specified values (such as attributes whose <code>specified</code> is
* <code>false</code>) if the <code>output-default-values</code> feature is
* set to <code>true</code>. If the <code>output-default-values</code> flag
* is set to <code>false</code> and the <code>use-abstract-schema</code>
* feature is set to <code>true</code> the abstract schema will be used to
* determine if a value is specified or not, if
* <code>use-abstract-schema</code> is not set the <code>specified</code>
* flag on attribute nodes is used to determine if attribute values should
* be written out.
* <p> Ref to Core spec (1.1.9, XML namespaces, 5th paragraph) entity ref
* description about warning about unbound entity refs. Entity refs are
* always serialized as &foo;, also mention this in the load part of
* this spec.
* <p> When serializing a document the DOMWriter checks to see if the document
* element in the document is a DOM Level 1 element or a DOM Level 2 (or
* higher) element (this check is done by looking at the localName of the
* root element). If the root element is a DOM Level 1 element then the
* DOMWriter will issue an error if a DOM Level 2 (or higher) element is
* found while serializing. Likewise if the document element is a DOM Level
* 2 (or higher) element and the DOMWriter sees a DOM Level 1 element an
* error is issued. Mixing DOM Level 1 elements with DOM Level 2 (or higher)
* is not supported.
* <p> <code>DOMWriter</code>s have a number of named features that can be
* queried or set. The name of <code>DOMWriter</code> features must be valid
* XML names. Implementation specific features (extensions) should choose an
* implementation dependent prefix to avoid name collisions.
* <p>Here is a list of properties that must be recognized by all
* implementations.
* <dl>
* <dt><code>"normalize-characters"</code></dt>
* <dd>
* <dl>
* <dt><code>true</code></dt>
* <dd>[
* optional] (default) Perform the W3C Text Normalization of the characters
* in document as they are written out. Only the characters being written
* are (potentially) altered. The DOM document itself is unchanged. </dd>
* <dt>
* <code>false</code></dt>
* <dd>[required] do not perform character normalization. </dd>
* </dl></dd>
* <dt>
* <code>"split-cdata-sections"</code></dt>
* <dd>
* <dl>
* <dt><code>true</code></dt>
* <dd>[required] (default)
* Split CDATA sections containing the CDATA section termination marker
* ']]>' or characters that can not be represented in the output
* encoding, and output the characters using numeric character references.
* If a CDATA section is split a warning is issued. </dd>
* <dt><code>false</code></dt>
* <dd>[
* required] Signal an error if a <code>CDATASection</code> contains an
* unrepresentable character. </dd>
* </dl></dd>
* <dt><code>"validation"</code></dt>
* <dd>
* <dl>
* <dt><code>true</code></dt>
* <dd>[
* optional] Use the abstract schema to validate the document as it is being
* serialized. If validation errors are found the error handler is notified
* about the error. Setting this state will also set the feature
* <code>use-abstract-schema</code> to <code>true</code>. </dd>
* <dt><code>false</code></dt>
* <dd>[
* required] (default) Don't validate the document as it is being
* serialized. </dd>
* </dl></dd>
* <dt><code>"expand-entity-references"</code></dt>
* <dd>
* <dl>
* <dt><code>true</code></dt>
* <dd>[
* optional] Expand <code>EntityReference</code> nodes when serializing. </dd>
* <dt>
* <code>false</code></dt>
* <dd>[required] (default) Serialize all
* <code>EntityReference</code> nodes as XML entity references. </dd>
* </dl></dd>
* <dt>
* <code>"whitespace-in-element-content"</code></dt>
* <dd>
* <dl>
* <dt><code>true</code></dt>
* <dd>[required] (
* default) Output all white spaces in the document. </dd>
* <dt><code>false</code></dt>
* <dd>[
* optional] Only output white space that is not within element content. The
* implementation is expected to use the
* <code>isWhitespaceInElementContent</code> flag on <code>Text</code> nodes
* to determine if a text node should be written out or not. </dd>
* </dl></dd>
* <dt>
* <code>"discard-default-content"</code></dt>
* <dd>
* <dl>
* <dt><code>true</code></dt>
* <dd>[required] (default
* ) Use whatever information available to the implementation (i.e. XML
* schema, DTD, the <code>specified</code> flag on <code>Attr</code> nodes,
* and so on) to decide what attributes and content should be serialized or
* not. Note that the <code>specified</code> flag on <code>Attr</code> nodes
* in itself is not always reliable, it is only reliable when it is set to
* <code>false</code> since the only case where it can be set to
* <code>false</code> is if the attribute was created by a Level 1
* implementation. </dd>
* <dt><code>false</code></dt>
* <dd>[required] Output all attributes and
* all content. </dd>
* </dl></dd>
* <dt><code>"format-canonical"</code></dt>
* <dd>
* <dl>
* <dt><code>true</code></dt>
* <dd>[optional]
* This formatting writes the document according to the rules specified in .
* Setting this feature to true will set the feature "format-pretty-print"
* to false. </dd>
* <dt><code>false</code></dt>
* <dd>[required] (default) Don't canonicalize the
* output. </dd>
* </dl></dd>
* <dt><code>"format-pretty-print"</code></dt>
* <dd>
* <dl>
* <dt><code>true</code></dt>
* <dd>[optional]
* Formatting the output by adding whitespace to produce a pretty-printed,
* indented, human-readable form. The exact form of the transformations is
* not specified by this specification. Setting this feature to true will
* set the feature "format-canonical" to false. </dd>
* <dt><code>false</code></dt>
* <dd>[required]
* (default) Don't pretty-print the result. </dd>
* </dl></dd>
* </dl>
* <p>See also the <a href='http://www.w3.org/TR/2002/WD-DOM-Level-3-ASLS-20020409'>Document Object Model (DOM) Level 3 Abstract Schemas and Load
* and Save Specification</a>.
*
* @since DOM Level 3
*/
#include <xercesc/dom/DOMNode.hpp>
#include <xercesc/dom/DOMWriterFilter.hpp>
#include <xercesc/dom/DOMErrorHandler.hpp>
#include <xercesc/framework/XMLFormatter.hpp>
XERCES_CPP_NAMESPACE_BEGIN
class CDOM_EXPORT DOMWriter {
protected :
// -----------------------------------------------------------------------
// Hidden constructors
// -----------------------------------------------------------------------
/** @name Hidden constructors */
//@{
DOMWriter() {};
//@}
private:
// -----------------------------------------------------------------------
// Unimplemented constructors and operators
// -----------------------------------------------------------------------
/** @name Unimplemented constructors and operators */
//@{
DOMWriter(const DOMWriter &);
DOMWriter & operator = (const DOMWriter &);
//@}
public:
// -----------------------------------------------------------------------
// All constructors are hidden, just the destructor is available
// -----------------------------------------------------------------------
/** @name Destructor */
//@{
/**
* Destructor
*
*/
virtual ~DOMWriter() {};
//@}
// -----------------------------------------------------------------------
// Virtual DOMWriter interface
// -----------------------------------------------------------------------
/** @name Functions introduced in DOM Level 3 */
//@{
// -----------------------------------------------------------------------
// Feature methods
// -----------------------------------------------------------------------
/**
* Query whether setting a feature to a specific value is supported.
* <br>The feature name has the same form as a DOM hasFeature string.
*
* <p><b>"Experimental - subject to change"</b></p>
*
* @param featName The feature name, which is a DOM has-feature style string.
* @param state The requested state of the feature (<code>true</code> or
* <code>false</code>).
* @return <code>true</code> if the feature could be successfully set to
* the specified value, or <code>false</code> if the feature is not
* recognized or the requested value is not supported. The value of
* the feature itself is not changed.
* @since DOM Level 3
*/
virtual bool canSetFeature(const XMLCh* const featName
, bool state) const = 0;
/**
* Set the state of a feature.
* <br>The feature name has the same form as a DOM hasFeature string.
* <br>It is possible for a <code>DOMWriter</code> to recognize a feature
* name but to be unable to set its value.
*
* <p><b>"Experimental - subject to change"</b></p>
*
* @param featName The feature name.
* @param state The requested state of the feature (<code>true</code> or
* <code>false</code>).
* @exception DOMException
* Raise a NOT_SUPPORTED_ERR exception when the <code>DOMWriter</code>
* recognizes the feature name but cannot set the requested value.
* <br>Raise a NOT_FOUND_ERR When the <code>DOMWriter</code> does not
* recognize the feature name.
* @see getFeature
* @since DOM Level 3
*/
virtual void setFeature(const XMLCh* const featName
, bool state) = 0;
/**
* Look up the value of a feature.
* <br>The feature name has the same form as a DOM hasFeature string
* @param featName The feature name, which is a string with DOM has-feature
* syntax.
* @return The current state of the feature (<code>true</code> or
* <code>false</code>).
* @exception DOMException
* Raise a NOT_FOUND_ERR When the <code>DOMWriter</code> does not
* recognize the feature name.
*
* <p><b>"Experimental - subject to change"</b></p>
*
* @see setFeature
* @since DOM Level 3
*/
virtual bool getFeature(const XMLCh* const featName) const = 0;
// -----------------------------------------------------------------------
// Setter methods
// -----------------------------------------------------------------------
/**
* The character encoding in which the output will be written.
* <br> The encoding to use when writing is determined as follows: If the
* encoding attribute has been set, that value will be used.If the
* encoding attribute is <code>null</code> or empty, but the item to be
* written includes an encoding declaration, that value will be used.If
* neither of the above provides an encoding name, a default encoding of
* "UTF-8" will be used.
* <br>The default value is <code>null</code>.
*
* <p><b>"Experimental - subject to change"</b></p>
*
* @param encoding The character encoding in which the output will be written.
* @see getEncoding
* @since DOM Level 3
*/
virtual void setEncoding(const XMLCh* const encoding) = 0;
/**
* The end-of-line sequence of characters to be used in the XML being
* written out. The only permitted values are these:
* <dl>
* <dt><code>null</code></dt>
* <dd>
* Use a default end-of-line sequence. DOM implementations should choose
* the default to match the usual convention for text files in the
* environment being used. Implementations must choose a default
* sequence that matches one of those allowed by 2.11 "End-of-Line
* Handling". </dd>
* <dt>CR</dt>
* <dd>The carriage-return character (#xD).</dd>
* <dt>CR-LF</dt>
* <dd> The
* carriage-return and line-feed characters (#xD #xA). </dd>
* <dt>LF</dt>
* <dd> The line-feed
* character (#xA). </dd>
* </dl>
* <br>The default value for this attribute is <code>null</code>.
*
* <p><b>"Experimental - subject to change"</b></p>
*
* @param newLine The end-of-line sequence of characters to be used.
* @see getNewLine
* @since DOM Level 3
*/
virtual void setNewLine(const XMLCh* const newLine) = 0;
/**
* The error handler that will receive error notifications during
* serialization. The node where the error occured is passed to this
* error handler, any modification to nodes from within an error
* callback should be avoided since this will result in undefined,
* implementation dependent behavior.
*
* <p><b>"Experimental - subject to change"</b></p>
*
* @param errorHandler The error handler to be used.
* @see getErrorHandler
* @since DOM Level 3
*/
virtual void setErrorHandler(DOMErrorHandler *errorHandler) = 0;
/**
* When the application provides a filter, the serializer will call out
* to the filter before serializing each Node. Attribute nodes are never
* passed to the filter. The filter implementation can choose to remove
* the node from the stream or to terminate the serialization early.
*
* <p><b>"Experimental - subject to change"</b></p>
*
* @param filter The writer filter to be used.
* @see getFilter
* @since DOM Level 3
*/
virtual void setFilter(DOMWriterFilter *filter) = 0;
// -----------------------------------------------------------------------
// Getter methods
// -----------------------------------------------------------------------
/**
* Return the character encoding in which the output will be written.
*
* <p><b>"Experimental - subject to change"</b></p>
*
* @return The character encoding used.
* @see setEncoding
* @since DOM Level 3
*/
virtual const XMLCh* getEncoding() const = 0;
/**
* Return the end-of-line sequence of characters to be used in the XML being
* written out.
*
* <p><b>"Experimental - subject to change"</b></p>
*
* @return The end-of-line sequence of characters to be used.
* @see setNewLine
* @since DOM Level 3
*/
virtual const XMLCh* getNewLine() const = 0;
/**
* Return the error handler that will receive error notifications during
* serialization.
*
* <p><b>"Experimental - subject to change"</b></p>
*
* @return The error handler to be used.
* @see setErrorHandler
* @since DOM Level 3
*/
virtual DOMErrorHandler* getErrorHandler() const = 0;
/**
* Return the WriterFilter used.
*
* <p><b>"Experimental - subject to change"</b></p>
*
* @return The writer filter used.
* @see setFilter
* @since DOM Level 3
*/
virtual DOMWriterFilter* getFilter() const = 0;
// -----------------------------------------------------------------------
// Write methods
// -----------------------------------------------------------------------
/**
* Write out the specified node as described above in the description of
* <code>DOMWriter</code>. Writing a Document or Entity node produces a
* serialized form that is well formed XML. Writing other node types
* produces a fragment of text in a form that is not fully defined by
* this document, but that should be useful to a human for debugging or
* diagnostic purposes.
*
* <p><b>"Experimental - subject to change"</b></p>
*
* @param destination The destination for the data to be written.
* @param nodeToWrite The <code>Document</code> or <code>Entity</code> node to
* be written. For other node types, something sensible should be
* written, but the exact serialized form is not specified.
* @return Returns <code>true</code> if <code>node</code> was
* successfully serialized and <code>false</code> in case a failure
* occured and the failure wasn't canceled by the error handler.
* @since DOM Level 3
*/
virtual bool writeNode(XMLFormatTarget* const destination
, const DOMNode &nodeToWrite) = 0;
/**
* Serialize the specified node as described above in the description of
* <code>DOMWriter</code>. The result of serializing the node is
* returned as a string. Writing a Document or Entity node produces a
* serialized form that is well formed XML. Writing other node types
* produces a fragment of text in a form that is not fully defined by
* this document, but that should be useful to a human for debugging or
* diagnostic purposes.
*
* <p><b>"Experimental - subject to change"</b></p>
*
* @param nodeToWrite The node to be written.
* @return Returns the serialized data, or <code>null</code> in case a
* failure occured and the failure wasn't canceled by the error
* handler. The returned string is always in UTF-16.
* The encoding information available in DOMWriter is ignored in writeToString().
* @since DOM Level 3
*/
virtual XMLCh* writeToString(const DOMNode &nodeToWrite) = 0;
//@}
// -----------------------------------------------------------------------
// Non-standard Extension
// -----------------------------------------------------------------------
/** @name Non-standard Extension */
//@{
/**
* Called to indicate that this Writer is no longer in use
* and that the implementation may relinquish any resources associated with it.
*
* Access to a released object will lead to unexpected result.
*/
virtual void release() = 0;
//@}
};
XERCES_CPP_NAMESPACE_END
#endif
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