org.apache.xml.serialize.OutputFormat Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
// Aug 21, 2000:
// Added ability to omit DOCTYPE declaration.
// Reported by Lars Martin
// Aug 25, 2000:
// Added ability to omit comments.
// Contributed by Anupam Bagchi
package org.apache.xml.serialize;
import java.io.UnsupportedEncodingException;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Node;
import org.w3c.dom.html.HTMLDocument;
/**
* Specifies an output format to control the serializer. Based on the
* XSLT specification for output format, plus additional parameters.
* Used to select the suitable serializer and determine how the
* document should be formatted on output.
*
* The two interesting constructors are:
*
* - {@link #OutputFormat(String,String,boolean)} creates a format
* for the specified method (XML, HTML, Text, etc), encoding and indentation
*
- {@link #OutputFormat(Document,String,boolean)} creates a format
* compatible with the document type (XML, HTML, Text, etc), encoding and
* indentation
*
*
*
* @deprecated This class was deprecated in Xerces 2.9.0. It is recommended
* that new applications use the DOM Level 3 LSSerializer or JAXP's Transformation
* API for XML (TrAX) for serializing XML and HTML. See the Xerces documentation for
* more information.
* @version $Revision: 476048 $ $Date: 2006-11-16 23:32:47 -0500 (Thu, 16 Nov 2006) $
* @author Assaf Arkin
* Keith Visco
* @see Serializer
* @see Method
* @see LineSeparator
*/
public class OutputFormat
{
/**
* @deprecated This class was deprecated in Xerces 2.9.0. It is recommended
* that new applications use the DOM Level 3 LSSerializer or JAXP's Transformation
* API for XML (TrAX) for serializing XML and HTML. See the Xerces documentation for
* more information.
*/
public static class DTD
{
/**
* Public identifier for HTML 4.01 (Strict) document type.
*/
public static final String HTMLPublicId = "-//W3C//DTD HTML 4.01//EN";
/**
* System identifier for HTML 4.01 (Strict) document type.
*/
public static final String HTMLSystemId =
"http://www.w3.org/TR/html4/strict.dtd";
/**
* Public identifier for XHTML 1.0 (Strict) document type.
*/
public static final String XHTMLPublicId =
"-//W3C//DTD XHTML 1.0 Strict//EN";
/**
* System identifier for XHTML 1.0 (Strict) document type.
*/
public static final String XHTMLSystemId =
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";
}
/**
* @deprecated This class was deprecated in Xerces 2.9.0. It is recommended
* that new applications use the DOM Level 3 LSSerializer or JAXP's Transformation
* API for XML (TrAX) for serializing XML and HTML. See the Xerces documentation for
* more information.
*/
public static class Defaults
{
/**
* If indentation is turned on, the default identation
* level is 4.
*
* @see #setIndenting(boolean)
*/
public static final int Indent = 4;
/**
* The default encoding for Web documents it UTF-8.
*
* @see #getEncoding()
*/
public static final String Encoding = "UTF-8";
/**
* The default line width at which to break long lines
* when identing. This is set to 72.
*/
public static final int LineWidth = 72;
}
/**
* Holds the output method specified for this document,
* or null if no method was specified.
*/
private String _method;
/**
* Specifies the version of the output method.
*/
private String _version;
/**
* The indentation level, or zero if no indentation
* was requested.
*/
private int _indent = 0;
/**
* The encoding to use, if an input stream is used.
* The default is always UTF-8.
*/
private String _encoding = Defaults.Encoding;
/**
* The EncodingInfo instance for _encoding.
*/
private EncodingInfo _encodingInfo = null;
// whether java names for encodings are permitted
private boolean _allowJavaNames = false;
/**
* The specified media type or null.
*/
private String _mediaType;
/**
* The specified document type system identifier, or null.
*/
private String _doctypeSystem;
/**
* The specified document type public identifier, or null.
*/
private String _doctypePublic;
/**
* True if the XML declaration should be ommited;
*/
private boolean _omitXmlDeclaration = false;
/**
* True if the DOCTYPE declaration should be ommited;
*/
private boolean _omitDoctype = false;
/**
* True if comments should be ommited;
*/
private boolean _omitComments = false;
/**
* True if the document type should be marked as standalone.
*/
private boolean _standalone = false;
/**
* List of element tag names whose text node children must
* be output as CDATA.
*/
private String[] _cdataElements;
/**
* List of element tag names whose text node children must
* be output unescaped.
*/
private String[] _nonEscapingElements;
/**
* The selected line separator.
*/
private String _lineSeparator = LineSeparator.Web;
/**
* The line width at which to wrap long lines when indenting.
*/
private int _lineWidth = Defaults.LineWidth;
/**
* True if spaces should be preserved in elements that do not
* specify otherwise, or specify the default behavior.
*/
private boolean _preserve = false;
/** If true, an empty string valued attribute is output as "". If false and
* and we are using the HTMLSerializer, then only the attribute name is
* serialized. Defaults to false for backwards compatibility.
*/
private boolean _preserveEmptyAttributes = false;
/**
* Constructs a new output format with the default values.
*/
public OutputFormat()
{
}
/**
* Constructs a new output format with the default values for
* the specified method and encoding. If indent
* is true, the document will be pretty printed with the default
* indentation level and default line wrapping.
*
* @param method The specified output method
* @param encoding The specified encoding
* @param indenting True for pretty printing
* @see #setEncoding
* @see #setIndenting
* @see #setMethod
*/
public OutputFormat( String method, String encoding, boolean indenting )
{
setMethod( method );
setEncoding( encoding );
setIndenting( indenting );
}
/**
* Constructs a new output format with the proper method,
* document type identifiers and media type for the specified
* document.
*
* @param doc The document to output
* @see #whichMethod
*/
public OutputFormat( Document doc )
{
setMethod( whichMethod( doc ) );
setDoctype( whichDoctypePublic( doc ), whichDoctypeSystem( doc ) );
setMediaType( whichMediaType( getMethod() ) );
}
/**
* Constructs a new output format with the proper method,
* document type identifiers and media type for the specified
* document, and with the specified encoding. If indent
* is true, the document will be pretty printed with the default
* indentation level and default line wrapping.
*
* @param doc The document to output
* @param encoding The specified encoding
* @param indenting True for pretty printing
* @see #setEncoding
* @see #setIndenting
* @see #whichMethod
*/
public OutputFormat( Document doc, String encoding, boolean indenting )
{
this( doc );
setEncoding( encoding );
setIndenting( indenting );
}
/**
* Returns the method specified for this output format.
* Typically the method will be xml, html
* or text, but it might be other values.
* If no method was specified, null will be returned
* and the most suitable method will be determined for
* the document by calling {@link #whichMethod}.
*
* @return The specified output method, or null
*/
public String getMethod()
{
return _method;
}
/**
* Sets the method for this output format.
*
* @see #getMethod
* @param method The output method, or null
*/
public void setMethod( String method )
{
_method = method;
}
/**
* Returns the version for this output method.
* If no version was specified, will return null
* and the default version number will be used.
* If the serializer does not support that particular
* version, it should default to a supported version.
*
* @return The specified method version, or null
*/
public String getVersion()
{
return _version;
}
/**
* Sets the version for this output method.
* For XML the value would be "1.0", for HTML
* it would be "4.0".
*
* @see #getVersion
* @param version The output method version, or null
*/
public void setVersion( String version )
{
_version = version;
}
/**
* Returns the indentation specified. If no indentation
* was specified, zero is returned and the document
* should not be indented.
*
* @return The indentation or zero
* @see #setIndenting
*/
public int getIndent()
{
return _indent;
}
/**
* Returns true if indentation was specified.
*/
public boolean getIndenting()
{
return ( _indent > 0 );
}
/**
* Sets the indentation. The document will not be
* indented if the indentation is set to zero.
* Calling {@link #setIndenting} will reset this
* value to zero (off) or the default (on).
*
* @param indent The indentation, or zero
*/
public void setIndent( int indent )
{
if ( indent < 0 )
_indent = 0;
else
_indent = indent;
}
/**
* Sets the indentation on and off. When set on, the default
* indentation level and default line wrapping is used
* (see {@link Defaults#Indent} and {@link Defaults#LineWidth}).
* To specify a different indentation level or line wrapping,
* use {@link #setIndent} and {@link #setLineWidth}.
*
* @param on True if indentation should be on
*/
public void setIndenting( boolean on )
{
if ( on ) {
_indent = Defaults.Indent;
_lineWidth = Defaults.LineWidth;
} else {
_indent = 0;
_lineWidth = 0;
}
}
/**
* Returns the specified encoding. If no encoding was
* specified, the default is always "UTF-8".
*
* @return The encoding
*/
public String getEncoding()
{
return _encoding;
}
/**
* Sets the encoding for this output method. If no
* encoding was specified, the default is always "UTF-8".
* Make sure the encoding is compatible with the one
* used by the {@link java.io.Writer}.
*
* @see #getEncoding
* @param encoding The encoding, or null
*/
public void setEncoding( String encoding )
{
_encoding = encoding;
_encodingInfo = null;
}
/**
* Sets the encoding for this output method with an EncodingInfo
* instance.
*/
public void setEncoding(EncodingInfo encInfo) {
_encoding = encInfo.getIANAName();
_encodingInfo = encInfo;
}
/**
* Returns an EncodingInfo instance for the encoding.
*
* @see #setEncoding
*/
public EncodingInfo getEncodingInfo() throws UnsupportedEncodingException {
if (_encodingInfo == null)
_encodingInfo = Encodings.getEncodingInfo(_encoding, _allowJavaNames);
return _encodingInfo;
}
/**
* Sets whether java encoding names are permitted
*/
public void setAllowJavaNames (boolean allow) {
_allowJavaNames = allow;
}
/**
* Returns whether java encoding names are permitted
*/
public boolean setAllowJavaNames () {
return _allowJavaNames;
}
/**
* Returns the specified media type, or null.
* To determine the media type based on the
* document type, use {@link #whichMediaType}.
*
* @return The specified media type, or null
*/
public String getMediaType()
{
return _mediaType;
}
/**
* Sets the media type.
*
* @see #getMediaType
* @param mediaType The specified media type
*/
public void setMediaType( String mediaType )
{
_mediaType = mediaType;
}
/**
* Sets the document type public and system identifiers.
* Required only if the DOM Document or SAX events do not
* specify the document type, and one must be present in
* the serialized document. Any document type specified
* by the DOM Document or SAX events will override these
* values.
*
* @param publicId The public identifier, or null
* @param systemId The system identifier, or null
*/
public void setDoctype( String publicId, String systemId )
{
_doctypePublic = publicId;
_doctypeSystem = systemId;
}
/**
* Returns the specified document type public identifier,
* or null.
*/
public String getDoctypePublic()
{
return _doctypePublic;
}
/**
* Returns the specified document type system identifier,
* or null.
*/
public String getDoctypeSystem()
{
return _doctypeSystem;
}
/**
* Returns true if comments should be ommited.
* The default is false.
*/
public boolean getOmitComments()
{
return _omitComments;
}
/**
* Sets comment omitting on and off.
*
* @param omit True if comments should be ommited
*/
public void setOmitComments( boolean omit )
{
_omitComments = omit;
}
/**
* Returns true if the DOCTYPE declaration should
* be ommited. The default is false.
*/
public boolean getOmitDocumentType()
{
return _omitDoctype;
}
/**
* Sets DOCTYPE declaration omitting on and off.
*
* @param omit True if DOCTYPE declaration should be ommited
*/
public void setOmitDocumentType( boolean omit )
{
_omitDoctype = omit;
}
/**
* Returns true if the XML document declaration should
* be ommited. The default is false.
*/
public boolean getOmitXMLDeclaration()
{
return _omitXmlDeclaration;
}
/**
* Sets XML declaration omitting on and off.
*
* @param omit True if XML declaration should be ommited
*/
public void setOmitXMLDeclaration( boolean omit )
{
_omitXmlDeclaration = omit;
}
/**
* Returns true if the document type is standalone.
* The default is false.
*/
public boolean getStandalone()
{
return _standalone;
}
/**
* Sets document DTD standalone. The public and system
* identifiers must be null for the document to be
* serialized as standalone.
*
* @param standalone True if document DTD is standalone
*/
public void setStandalone( boolean standalone )
{
_standalone = standalone;
}
/**
* Returns a list of all the elements whose text node children
* should be output as CDATA, or null if no such elements were
* specified.
*/
public String[] getCDataElements()
{
return _cdataElements;
}
/**
* Returns true if the text node children of the given elements
* should be output as CDATA.
*
* @param tagName The element's tag name
* @return True if should serialize as CDATA
*/
public boolean isCDataElement( String tagName )
{
int i;
if ( _cdataElements == null )
return false;
for ( i = 0 ; i < _cdataElements.length ; ++i )
if ( _cdataElements[ i ].equals( tagName ) )
return true;
return false;
}
/**
* Sets the list of elements for which text node children
* should be output as CDATA.
*
* @param cdataElements List of CDATA element tag names
*/
public void setCDataElements( String[] cdataElements )
{
_cdataElements = cdataElements;
}
/**
* Returns a list of all the elements whose text node children
* should be output unescaped (no character references), or null
* if no such elements were specified.
*/
public String[] getNonEscapingElements()
{
return _nonEscapingElements;
}
/**
* Returns true if the text node children of the given elements
* should be output unescaped.
*
* @param tagName The element's tag name
* @return True if should serialize unescaped
*/
public boolean isNonEscapingElement( String tagName )
{
int i;
if ( _nonEscapingElements == null ) {
return false;
}
for ( i = 0 ; i < _nonEscapingElements.length ; ++i )
if ( _nonEscapingElements[ i ].equals( tagName ) )
return true;
return false;
}
/**
* Sets the list of elements for which text node children
* should be output unescaped (no character references).
*
* @param nonEscapingElements List of unescaped element tag names
*/
public void setNonEscapingElements( String[] nonEscapingElements )
{
_nonEscapingElements = nonEscapingElements;
}
/**
* Returns a specific line separator to use. The default is the
* Web line separator (\n). A string is returned to
* support double codes (CR + LF).
*
* @return The specified line separator
*/
public String getLineSeparator()
{
return _lineSeparator;
}
/**
* Sets the line separator. The default is the Web line separator
* (\n). The machine's line separator can be obtained
* from the system property line.separator, but is only
* useful if the document is edited on machines of the same type.
* For general documents, use the Web line separator.
*
* @param lineSeparator The specified line separator
*/
public void setLineSeparator( String lineSeparator )
{
if ( lineSeparator == null )
_lineSeparator = LineSeparator.Web;
else
_lineSeparator = lineSeparator;
}
/**
* Returns true if the default behavior for this format is to
* preserve spaces. All elements that do not specify otherwise
* or specify the default behavior will be formatted based on
* this rule. All elements that specify space preserving will
* always preserve space.
*/
public boolean getPreserveSpace()
{
return _preserve;
}
/**
* Sets space preserving as the default behavior. The default is
* space stripping and all elements that do not specify otherwise
* or use the default value will not preserve spaces.
*
* @param preserve True if spaces should be preserved
*/
public void setPreserveSpace( boolean preserve )
{
_preserve = preserve;
}
/**
* Return the selected line width for breaking up long lines.
* When indenting, and only when indenting, long lines will be
* broken at space boundaries based on this line width.
* No line wrapping occurs if this value is zero.
*/
public int getLineWidth()
{
return _lineWidth;
}
/**
* Sets the line width. If zero then no line wrapping will
* occur. Calling {@link #setIndenting} will reset this
* value to zero (off) or the default (on).
*
* @param lineWidth The line width to use, zero for default
* @see #getLineWidth
* @see #setIndenting
*/
public void setLineWidth( int lineWidth )
{
if ( lineWidth <= 0 )
_lineWidth = 0;
else
_lineWidth = lineWidth;
}
/**
* Returns the preserveEmptyAttribute flag. If flag is false, then'
* attributes with empty string values are output as the attribute
* name only (in HTML mode).
* @return preserve the preserve flag
*/ public boolean getPreserveEmptyAttributes () { return _preserveEmptyAttributes; } /**
* Sets the preserveEmptyAttribute flag. If flag is false, then'
* attributes with empty string values are output as the attribute
* name only (in HTML mode).
* @param preserve the preserve flag
*/ public void setPreserveEmptyAttributes (boolean preserve) { _preserveEmptyAttributes = preserve; }
/**
* Returns the last printable character based on the selected
* encoding. Control characters and non-printable characters
* are always printed as character references.
*/
public char getLastPrintable()
{
if ( getEncoding() != null &&
( getEncoding().equalsIgnoreCase( "ASCII" ) ) ) {
return 0xFF;
}
return 0xFFFF;
}
/**
* Determine the output method for the specified document.
* If the document is an instance of {@link org.w3c.dom.html.HTMLDocument}
* then the method is said to be html. If the root
* element is 'html' and all text nodes preceding the root
* element are all whitespace, then the method is said to be
* html. Otherwise the method is xml.
*
* @param doc The document to check
* @return The suitable method
*/
public static String whichMethod( Document doc )
{
Node node;
String value;
int i;
// If document is derived from HTMLDocument then the default
// method is html.
if ( doc instanceof HTMLDocument )
return Method.HTML;
// Lookup the root element and the text nodes preceding it.
// If root element is html and all text nodes contain whitespace
// only, the method is html.
// FIXME (SM) should we care about namespaces here?
node = doc.getFirstChild();
while (node != null) {
// If the root element is html, the method is html.
if ( node.getNodeType() == Node.ELEMENT_NODE ) {
if ( node.getNodeName().equalsIgnoreCase( "html" ) ) {
return Method.HTML;
} else if ( node.getNodeName().equalsIgnoreCase( "root" ) ) {
return Method.FOP;
} else {
return Method.XML;
}
} else if ( node.getNodeType() == Node.TEXT_NODE ) {
// If a text node preceding the root element contains
// only whitespace, this might be html, otherwise it's
// definitely xml.
value = node.getNodeValue();
for ( i = 0 ; i < value.length() ; ++i )
if ( value.charAt( i ) != 0x20 && value.charAt( i ) != 0x0A &&
value.charAt( i ) != 0x09 && value.charAt( i ) != 0x0D )
return Method.XML;
}
node = node.getNextSibling();
}
// Anything else, the method is xml.
return Method.XML;
}
/**
* Returns the document type public identifier
* specified for this document, or null.
*/
public static String whichDoctypePublic( Document doc )
{
DocumentType doctype;
/* DOM Level 2 was introduced into the code base*/
doctype = doc.getDoctype();
if ( doctype != null ) {
// Note on catch: DOM Level 1 does not specify this method
// and the code will throw a NoSuchMethodError
try {
return doctype.getPublicId();
} catch ( Error except ) { }
}
if ( doc instanceof HTMLDocument )
return DTD.XHTMLPublicId;
return null;
}
/**
* Returns the document type system identifier
* specified for this document, or null.
*/
public static String whichDoctypeSystem( Document doc )
{
DocumentType doctype;
/* DOM Level 2 was introduced into the code base*/
doctype = doc.getDoctype();
if ( doctype != null ) {
// Note on catch: DOM Level 1 does not specify this method
// and the code will throw a NoSuchMethodError
try {
return doctype.getSystemId();
} catch ( Error except ) { }
}
if ( doc instanceof HTMLDocument )
return DTD.XHTMLSystemId;
return null;
}
/**
* Returns the suitable media format for a document
* output with the specified method.
*/
public static String whichMediaType( String method )
{
if ( method.equalsIgnoreCase( Method.XML ) )
return "text/xml";
if ( method.equalsIgnoreCase( Method.HTML ) )
return "text/html";
if ( method.equalsIgnoreCase( Method.XHTML ) )
return "text/html";
if ( method.equalsIgnoreCase( Method.TEXT ) )
return "text/plain";
if ( method.equalsIgnoreCase( Method.FOP ) )
return "application/pdf";
return null;
}
}