Class DataWriter
- java.lang.Object
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- org.xml.sax.helpers.XMLFilterImpl
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- com.sun.xml.bind.marshaller.XMLWriter
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- com.sun.xml.bind.marshaller.DataWriter
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- All Implemented Interfaces:
ContentHandler
,DTDHandler
,EntityResolver
,ErrorHandler
,XMLFilter
,XMLReader
public class DataWriter extends XMLWriter
Write data- or field-oriented XML.This filter pretty-prints field-oriented XML without mixed content. all added indentation and newlines will be passed on down the filter chain (if any).
In general, all whitespace in an XML document is potentially significant, so a general-purpose XML writing tool like the
XMLWriter
class cannot add newlines or indentation.There is, however, a large class of XML documents where information is strictly fielded: each element contains either character data or other elements, but not both. For this special case, it is possible for a writing tool to provide automatic indentation and newlines without requiring extra work from the user. Note that this class will likely not yield appropriate results for document-oriented XML like XHTML pages, which mix character data and elements together.
This writer will automatically place each start tag on a new line, optionally indented if an indent step is provided (by default, there is no indentation). If an element contains other elements, the end tag will also appear on a new line with leading indentation. Consider, for example, the following code:
DataWriter w = new DataWriter(); w.setIndentStep(2); w.startDocument(); w.startElement("Person"); w.dataElement("name", "Jane Smith"); w.dataElement("date-of-birth", "1965-05-23"); w.dataElement("citizenship", "US"); w.endElement("Person"); w.endDocument();
This code will produce the following document:
<?xml version="1.0" standalone="yes"?> <Person> <name>Jane Smith</name> <date-of-birth>1965-05-23</date-of-birth> <citizenship>US</citizenship> </Person>
This class inherits from
XMLWriter
, and provides all of the same support for Namespaces.- Since:
- 1.0
- Version:
- 0.2
- Author:
- David Megginson, [email protected]
- See Also:
XMLWriter
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Constructor Summary
Constructors Constructor Description DataWriter(Writer writer, String encoding)
DataWriter(Writer writer, String encoding, CharacterEscapeHandler _escapeHandler)
Create a new data writer for the specified output.
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Method Summary
All Methods Instance Methods Concrete Methods Deprecated Methods Modifier and Type Method Description void
characters(char[] ch, int start, int length)
Write a sequence of characters.void
endDocument()
Write a newline at the end of the document.void
endElement(String uri, String localName, String qName)
Write an end tag.int
getIndentStep()
Deprecated.Only return the length of the indent string.void
reset()
Reset the writer so that it can be reused.void
setIndentStep(int indentStep)
Deprecated.Should use the version that takes string.void
setIndentStep(String s)
void
startElement(String uri, String localName, String qName, Attributes atts)
Write a start tag.protected void
writeXmlDecl(String decl)
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Methods inherited from class com.sun.xml.bind.marshaller.XMLWriter
characters, dataElement, dataElement, dataElement, endElement, endElement, flush, ignorableWhitespace, processingInstruction, setHeader, setOutput, setXmlDecl, startDocument, startElement, startElement, startPrefixMapping, write, write
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Methods inherited from class org.xml.sax.helpers.XMLFilterImpl
endPrefixMapping, error, fatalError, getContentHandler, getDTDHandler, getEntityResolver, getErrorHandler, getFeature, getParent, getProperty, notationDecl, parse, parse, resolveEntity, setContentHandler, setDocumentLocator, setDTDHandler, setEntityResolver, setErrorHandler, setFeature, setParent, setProperty, skippedEntity, unparsedEntityDecl, warning
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Constructor Detail
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DataWriter
public DataWriter(Writer writer, String encoding, CharacterEscapeHandler _escapeHandler)
Create a new data writer for the specified output.- Parameters:
writer
- The character stream where the XML document will be written.encoding
- If non-null string is specified, it is written as a part of the XML declaration.
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Method Detail
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getIndentStep
public int getIndentStep()
Deprecated.Only return the length of the indent string.Return the current indent step.Return the current indent step: each start tag will be indented by this number of spaces times the number of ancestors that the element has.
- Returns:
- The number of spaces in each indentation step, or 0 or less for no indentation.
- See Also:
setIndentStep(int)
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setIndentStep
public void setIndentStep(int indentStep)
Deprecated.Should use the version that takes string.Set the current indent step.- Parameters:
indentStep
- The new indent step (0 or less for no indentation).- See Also:
getIndentStep()
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setIndentStep
public void setIndentStep(String s)
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reset
public void reset()
Reset the writer so that it can be reused.This method is especially useful if the writer failed with an exception the last time through.
- Overrides:
reset
in classXMLWriter
- See Also:
XMLWriter.reset()
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writeXmlDecl
protected void writeXmlDecl(String decl) throws IOException
- Overrides:
writeXmlDecl
in classXMLWriter
- Throws:
IOException
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startElement
public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException
Write a start tag.Each tag will begin on a new line, and will be indented by the current indent step times the number of ancestors that the element has.
The newline and indentation will be passed on down the filter chain through regular characters events.
- Specified by:
startElement
in interfaceContentHandler
- Overrides:
startElement
in classXMLWriter
- Parameters:
uri
- The element's Namespace URI.localName
- The element's local name.qName
- The element's qualified (prefixed) name.atts
- The element's attribute list.- Throws:
SAXException
- If there is an error writing the start tag, or if a filter further down the chain raises an exception.- See Also:
XMLWriter.startElement(String, String, String, Attributes)
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endElement
public void endElement(String uri, String localName, String qName) throws SAXException
Write an end tag.If the element has contained other elements, the tag will appear indented on a new line; otherwise, it will appear immediately following whatever came before.
The newline and indentation will be passed on down the filter chain through regular characters events.
- Specified by:
endElement
in interfaceContentHandler
- Overrides:
endElement
in classXMLWriter
- Parameters:
uri
- The element's Namespace URI.localName
- The element's local name.qName
- The element's qualified (prefixed) name.- Throws:
SAXException
- If there is an error writing the end tag, or if a filter further down the chain raises an exception.- See Also:
XMLWriter.endElement(String, String, String)
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endDocument
public void endDocument() throws SAXException
Description copied from class:XMLWriter
Write a newline at the end of the document. Pass the event on down the filter chain for further processing.- Specified by:
endDocument
in interfaceContentHandler
- Overrides:
endDocument
in classXMLWriter
- Throws:
SAXException
- If there is an error writing the newline, or if a handler further down the filter chain raises an exception.- See Also:
ContentHandler.endDocument()
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characters
public void characters(char[] ch, int start, int length) throws SAXException
Write a sequence of characters.- Specified by:
characters
in interfaceContentHandler
- Overrides:
characters
in classXMLWriter
- Parameters:
ch
- The characters to write.start
- The starting position in the array.length
- The number of characters to use.- Throws:
SAXException
- If there is an error writing the characters, or if a filter further down the chain raises an exception.- See Also:
XMLWriter.characters(char[], int, int)
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