Package: groovy.xml

## [Java] Class MarkupBuilder

- groovy.xml.MarkupBuilder

- A helper class for creating XML or HTML markup. The builder supports various 'pretty printed' formats.

  Example:

       new MarkupBuilder().root {
         a( a1:'one' ) {
           b { mkp.yield( '3 < 5' ) }
           c( a2:'two', 'blah' )
         }
       }

  Will print the following to System.out:

       <root>
         <a a1='one'>
           <b>3 &lt; 5</b>
           <c a2='two'>blah</c>
         </a>
       </root>

  Notes:
  - `mkp` is a special namespace used to escape away from the normal building mode of the builder and get access to helper markup methods such as 'yield' and 'yieldUnescaped'. See the javadoc for getMkp() for further details.
  - Note that tab, newline and carriage return characters are escaped within attributes, i.e. will become &#09;, &#10; and &#13; respectively

- - ### Properties Summary

    Properties
    Type | Name and description
    --- | ---
    `boolean` | `escapeAttributes`
    `boolean` | `expandEmptyElements`
    `boolean` | `omitEmptyAttributes`
    `boolean` | `omitNullAttributes`

  - ### Constructor Summary

    Constructors
    Constructor and description
    `MarkupBuilder ()` Prints markup to System.out
    `MarkupBuilder (PrintWriter pw)` Sends markup to the given PrintWriter
    `MarkupBuilder (Writer writer)` Sends markup to the given Writer but first wrapping it in a PrintWriter
    `MarkupBuilder (IndentPrinter out)` Sends markup to the given IndentPrinter.

  - ### Methods Summary

    Methods
    Type Params | Return Type | Name and description
    --- | --- | ---
    `` | `protected Object` | `createNode(Object name)`
    `` | `protected Object` | `createNode(Object name, Object value)`
    `` | `protected Object` | `createNode(Object name, Map attributes, Object value)`
    `` | `protected Object` | `createNode(Object name, Map attributes)`
    `` | `boolean` | `getDoubleQuotes()` Returns `true` if attribute values are output with double quotes; `false` if single quotes are used.
    `` | `MarkupBuilderHelper` | `getMkp()` Property that may be called from within your builder closure to access helper methods, namely MarkupBuilderHelper.yield, MarkupBuilderHelper.yieldUnescaped, MarkupBuilderHelper.pi, MarkupBuilderHelper.xmlDeclaration and MarkupBuilderHelper.comment.
    `` | `protected Object` | `getName(String methodName)`
    `` | `protected IndentPrinter` | `getPrinter()`
    `` | `boolean` | `isEscapeAttributes()` Returns the escapeAttributes property value.
    `` | `boolean` | `isExpandEmptyElements()` Whether empty elements are expanded from <tagName/> to <tagName></tagName>.
    `` | `boolean` | `isOmitEmptyAttributes()` Determine whether empty attributes will appear in the produced markup.
    `` | `boolean` | `isOmitNullAttributes()` Determine whether null attributes will appear in the produced markup.
    `` | `protected void` | `nodeCompleted(Object parent, Object node)`
    `` | `protected void` | `print(Object node)`
    `` | `void` | `setDoubleQuotes(boolean useDoubleQuotes)` Sets whether the builder outputs attribute values in double quotes or single quotes.
    `` | `void` | `setEscapeAttributes(boolean escapeAttributes)` Defaults to true. If set to false then you must escape any special characters within attribute values such as '&', '<', CR/LF, single and double quotes etc. manually as needed.
    `` | `void` | `setExpandEmptyElements(boolean expandEmptyElements)` Whether empty elements are expanded from <tagName/> to <tagName></tagName>.
    `` | `void` | `setOmitEmptyAttributes(boolean omitEmptyAttributes)` Allows empty attributes to be removed from the generated markup.
    `` | `void` | `setOmitNullAttributes(boolean omitNullAttributes)` Allows null attributes to be removed from the generated markup.
    `` | `protected void` | `setParent(Object parent, Object child)`

  - ### Inherited Methods Summary

    Inherited Methods
    Methods inherited from class | Name
    --- | ---
    `class BuilderSupport` | `createNode, createNode, createNode, createNode, doInvokeMethod, getCurrent, getName, invokeMethod, invokeMethod, nodeCompleted, postNodeCompletion, setClosureDelegate, setCurrent, setParent`
    `class GroovyObjectSupport` | `getMetaClass, getProperty, invokeMethod, setMetaClass, setProperty`

- - ### Property Detail

    - #### boolean escapeAttributes

    - #### boolean expandEmptyElements

    - #### boolean omitEmptyAttributes

    - #### boolean omitNullAttributes

  - ### Constructor Detail

    - #### public MarkupBuilder()

      Prints markup to System.out

      See Also:
        IndentPrinter.IndentPrinter

    - #### public MarkupBuilder(PrintWriter pw)

      Sends markup to the given PrintWriter

      Parameters:
        `pw` - the PrintWriter to use
      See Also:
        IndentPrinter.IndentPrinter

    - #### public MarkupBuilder(Writer writer)

      Sends markup to the given Writer but first wrapping it in a PrintWriter

      Parameters:
        `writer` - the writer to use
      See Also:
        IndentPrinter.IndentPrinter

    - #### public MarkupBuilder(IndentPrinter out)

      Sends markup to the given IndentPrinter. Use this option if you want to customize the indent used or provide your own IndentPrinter.

      Parameters:
        `out` - the IndentPrinter to use

  - ### Method Detail

    - #### protected Object createNode(Object name)

    - #### protected Object createNode(Object name, Object value)

    - #### protected Object createNode(Object name, Map attributes, Object value)

    - #### protected Object createNode(Object name, Map attributes)

    - #### public boolean getDoubleQuotes()

      Returns `true` if attribute values are output with double quotes; `false` if single quotes are used. By default, single quotes are used.

      Returns:
        true if double quotes are used for attributes

    - #### public MarkupBuilderHelper getMkp()

      Property that may be called from within your builder closure to access helper methods, namely MarkupBuilderHelper.yield, MarkupBuilderHelper.yieldUnescaped, MarkupBuilderHelper.pi, MarkupBuilderHelper.xmlDeclaration and MarkupBuilderHelper.comment.

      Returns:
        this MarkupBuilder

    - #### protected Object getName(String methodName)

    - #### protected IndentPrinter getPrinter()

    - #### public boolean isEscapeAttributes()

      Returns the escapeAttributes property value.

      Returns:
        the escapeAttributes property value
      See Also:
        setEscapeAttributes(boolean)

    - #### public boolean isExpandEmptyElements()

      Whether empty elements are expanded from <tagName/> to <tagName></tagName>.

      Returns:
        `true`, if empty elements will be represented by an opening tag followed immediately by a closing tag.

    - #### public boolean isOmitEmptyAttributes()

      Determine whether empty attributes will appear in the produced markup.

      Returns:
        `true`, if empty attributes will be removed from the resulting markup.

    - #### public boolean isOmitNullAttributes()

      Determine whether null attributes will appear in the produced markup.

      Returns:
        `true`, if null attributes will be removed from the resulting markup.

    - #### protected void nodeCompleted(Object parent, Object node)

    - #### protected void print(Object node)

    - #### public void setDoubleQuotes(boolean useDoubleQuotes)

      Sets whether the builder outputs attribute values in double quotes or single quotes.

      Parameters:
        `useDoubleQuotes` - If this parameter is `true`, double quotes are used; otherwise, single quotes are.

    - #### public void setEscapeAttributes(boolean escapeAttributes)

      Defaults to true. If set to false then you must escape any special characters within attribute values such as '&', '<', CR/LF, single and double quotes etc. manually as needed. The builder will not guard against producing invalid XML when in this mode and the output may not be able to be parsed/round-tripped but it does give you full control when producing for instance HTML output.

      Parameters:
        `escapeAttributes` - the new value

    - #### public void setExpandEmptyElements(boolean expandEmptyElements)

      Whether empty elements are expanded from <tagName/> to <tagName></tagName>.

      Parameters:
        `expandEmptyElements` - if `true`, empty elements will be represented by an opening tag followed immediately by a closing tag. Defaults to `false`.

    - #### public void setOmitEmptyAttributes(boolean omitEmptyAttributes)

      Allows empty attributes to be removed from the generated markup.

      Parameters:
        `omitEmptyAttributes` - if `true`, empty attributes will not be included in the resulting markup. Defaults to `false`.

    - #### public void setOmitNullAttributes(boolean omitNullAttributes)

      Allows null attributes to be removed from the generated markup.

      Parameters:
        `omitNullAttributes` - if `true`, null attributes will not be included in the resulting markup. If `false` null attributes will be included in the markup as empty strings regardless of the omitEmptyAttribute setting. Defaults to `false`.

    - #### protected void setParent(Object parent, Object child)