Class XmlOutput


public class XmlOutput extends Object
Streaming XML output.

Use this class to write XML to any streaming source. While the class itself is unstructured and doesn't enforce any DTD specification, use of the class does ensure that the output is syntactically valid XML.

  • Constructor Details

    • XmlOutput

      public XmlOutput(Writer out)
      Constructs a new XmlOutput based on any Writer.
      out - the writer to which this XmlOutput generates results.
    • XmlOutput

      public XmlOutput(PrintWriter out)
      Constructs a new XmlOutput based on a PrintWriter.
      out - the writer to which this XmlOutput generates results.
  • Method Details

    • setCompact

      public void setCompact(boolean compact)
      Sets or unsets the compact mode. Compact mode causes the generated XML to be free of extraneous whitespace and other unnecessary characters.
      compact - true to turn on compact mode, or false to turn it off.
    • getCompact

      public boolean getCompact()
    • setIndentString

      public void setIndentString(String indentString)
      Sets the string to print for each level of indentation. The default is a tab. The value must not be null. Set this to the empty string to achieve no indentation (note that setCompact(boolean)(true) removes indentation and newlines).
    • setGlob

      public void setGlob(boolean glob)
      Sets whether to detect that tags are empty.
    • setAlwaysQuoteCData

      public void setAlwaysQuoteCData(boolean alwaysQuoteCData)
      Sets whether to always quote cdata segments (even if they don't contain special characters).
    • setIgnorePcdata

      public void setIgnorePcdata(boolean ignorePcdata)
      Sets whether to ignore unquoted text, such as whitespace.
    • getIgnorePcdata

      public boolean getIgnorePcdata()
    • print

      public void print(String s)
      Sends a string directly to the output stream, without escaping any characters. Use with caution!
    • beginTag

      public void beginTag(String tagName, @Nullable org.apache.calcite.util.XmlOutput.XMLAttrVector attributes)
      Starts writing a new tag to the stream. The tag's name must be given and its attributes should be specified by a fully constructed AttrVector object.
      tagName - the name of the tag to write.
      attributes - an XMLAttrVector containing the attributes to include in the tag.
    • beginBeginTag

      public void beginBeginTag(String tagName)
    • endBeginTag

      public void endBeginTag(String tagName)
    • attribute

      public void attribute(String name, String value)
      Writes an attribute.
    • beginNode

      public void beginNode()
      If we are currently inside the start tag, finishes it off.
    • endTag

      public void endTag(String tagName)
      Completes a tag. This outputs the end tag corresponding to the last exposed beginTag. The tag name must match the name of the corresponding beginTag.
      tagName - the name of the end tag to write.
    • emptyTag

      public void emptyTag(String tagName, org.apache.calcite.util.XmlOutput.XMLAttrVector attributes)
      Writes an empty tag to the stream. An empty tag is one with no tags inside it, although it may still have attributes.
      tagName - the name of the empty tag.
      attributes - an XMLAttrVector containing the attributes to include in the tag.
    • cdata

      public void cdata(String data)
      Writes a CDATA section. Such sections always appear on their own line. The nature in which the CDATA section is written depends on the actual string content with respect to these special characters/sequences:
      • &
      • "
      • '
      • <
      • >
      Additionally, the sequence ]]> is special.
      • Content containing no special characters will be left as-is.
      • Content containing one or more special characters but not the sequence ]]> will be enclosed in a CDATA section.
      • Content containing special characters AND at least one ]]> sequence will be left as-is but have all of its special characters encoded as entities.
      These special treatment rules are required to allow cdata sections to contain XML strings which may themselves contain cdata sections. Traditional CDATA sections do not nest.
    • cdata

      public void cdata(@Nullable String data, boolean quote)
      Writes a CDATA section (as cdata(String)).
      data - string to write
      quote - if true, quote in a <![CDATA[ ... ]]> regardless of the content of data; if false, quote only if the content needs it
    • stringTag

      public void stringTag(String name, String data)
      Writes a String tag; a tag containing nothing but a CDATA section.
    • content

      public void content(@Nullable String content)
      Writes content.
    • header

      public void header()
      Write header. Use default version 1.0.
    • header

      public void header(String version)
      Write header, take version as input.
    • numTagsWritten

      public int numTagsWritten()
      Returns the total number of tags written.
      the total number of tags written to the XML stream.