maven-plugin-tools-generators/src/main/resources/help-class-source.vm - maven-plugin-tools - Git at Google

 ## 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.
 #if ($helpPackageName.length()>0)
 package ${helpPackageName};
 #end

 import org.apache.maven.plugin.AbstractMojo;
 import org.apache.maven.plugin.MojoExecutionException;
 #if ( $useAnnotations )
 import org.apache.maven.plugins.annotations.Mojo;
 import org.apache.maven.plugins.annotations.Parameter;
 #end

 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
 import org.w3c.dom.Node;
 import org.w3c.dom.NodeList;
 import org.xml.sax.SAXException;

 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.parsers.ParserConfigurationException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.List;

 /**
  * Display help information on ${artifactId}.<br>
  * Call <code>mvn ${goalPrefix}:help -Ddetail=true -Dgoal=&lt;goal-name&gt;</code> to display parameter details.
  * @author maven-plugin-tools
 #if ( !$useAnnotations )
  * @goal help
  * @requiresProject false
  * @threadSafe
 #end
  */
 #if ( $useAnnotations )
 @Mojo( name = "help", requiresProject = false, threadSafe = true )
 #end
 public class HelpMojo
     extends AbstractMojo
 {
     /**
      * If <code>true</code>, display all settable properties for each goal.
      *
 #if ( !$useAnnotations )
      * @parameter property="detail" default-value="false"
 #end
      */
 #if ( $useAnnotations )
     @Parameter( property = "detail", defaultValue = "false" )
 #end
     private boolean detail;

     /**
      * The name of the goal for which to show help. If unspecified, all goals will be displayed.
      *
 #if ( !$useAnnotations )
      * @parameter property="goal"
 #end
      */
 #if ( $useAnnotations )
     @Parameter( property = "goal" )
 #end
     private java.lang.String goal;

     /**
      * The maximum length of a display line, should be positive.
      *
 #if ( !$useAnnotations )
      * @parameter property="lineLength" default-value="80"
 #end
      */
 #if ( $useAnnotations )
     @Parameter( property = "lineLength", defaultValue = "80" )
 #end
     private int lineLength;

     /**
      * The number of spaces per indentation level, should be positive.
      *
 #if ( !$useAnnotations )
      * @parameter property="indentSize" default-value="2"
 #end
      */
 #if ( $useAnnotations )
     @Parameter( property = "indentSize", defaultValue = "2" )
 #end
     private int indentSize;

     // groupId/artifactId/plugin-help.xml
     private static final String PLUGIN_HELP_PATH =
                     "/${pluginHelpPath}";

     private static final int DEFAULT_LINE_LENGTH = 80;

     private Document build()
         throws MojoExecutionException
     {
         getLog().debug( "load plugin-help.xml: " + PLUGIN_HELP_PATH );
         try ( InputStream is = getClass().getResourceAsStream( PLUGIN_HELP_PATH ) )
         {
             DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
             DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
             return dBuilder.parse( is );
         }
         catch ( IOException e )
         {
             throw new MojoExecutionException( e.getMessage(), e );
         }
         catch ( ParserConfigurationException e )
         {
             throw new MojoExecutionException( e.getMessage(), e );
         }
         catch ( SAXException e )
         {
             throw new MojoExecutionException( e.getMessage(), e );
         }
     }

     /**
      * {@inheritDoc}
      */
     @Override
     public void execute()
         throws MojoExecutionException
     {
         if ( lineLength <= 0 )
         {
             getLog().warn( "The parameter 'lineLength' should be positive, using '80' as default." );
             lineLength = DEFAULT_LINE_LENGTH;
         }
         if ( indentSize <= 0 )
         {
             getLog().warn( "The parameter 'indentSize' should be positive, using '2' as default." );
             indentSize = 2;
         }

         Document doc = build();

         StringBuilder sb = new StringBuilder();
         Node plugin = getSingleChild( doc, "plugin" );


         String name = getValue( plugin, "name" );
         String version = getValue( plugin, "version" );
         String id = getValue( plugin, "groupId" ) + ":" + getValue( plugin, "artifactId" ) + ":" + version;
         if ( isNotEmpty( name ) && !name.contains( id ) )
         {
             append( sb, name + " " + version, 0 );
         }
         else
         {
             if ( isNotEmpty( name ) )
             {
                 append( sb, name, 0 );
             }
             else
             {
                 append( sb, id, 0 );
             }
         }
         append( sb, getValue( plugin, "description" ), 1 );
         append( sb, "", 0 );

         //<goalPrefix>plugin</goalPrefix>
         String goalPrefix = getValue( plugin, "goalPrefix" );

         Node mojos1 = getSingleChild( plugin, "mojos" );

         List<Node> mojos = findNamedChild( mojos1, "mojo" );

         if ( goal == null || goal.length() <= 0 )
         {
             append( sb, "This plugin has " + mojos.size() + ( mojos.size() > 1 ? " goals:" : " goal:" ), 0 );
             append( sb, "", 0 );
         }

         for ( Node mojo : mojos )
         {
             writeGoal( sb, goalPrefix, (Element) mojo );
         }

         if ( getLog().isInfoEnabled() )
         {
             getLog().info( sb.toString() );
         }
     }


     private static boolean isNotEmpty( String string )
     {
         return string != null && string.length() > 0;
     }

     private static String getValue( Node node, String elementName )
         throws MojoExecutionException
     {
         return getSingleChild( node, elementName ).getTextContent();
     }

     private static Node getSingleChild( Node node, String elementName )
         throws MojoExecutionException
     {
         List<Node> namedChild = findNamedChild( node, elementName );
         if ( namedChild.isEmpty() )
         {
             throw new MojoExecutionException( "Could not find " + elementName + " in plugin-help.xml" );
         }
         if ( namedChild.size() > 1 )
         {
             throw new MojoExecutionException( "Multiple " + elementName + " in plugin-help.xml" );
         }
         return namedChild.get( 0 );
     }

     private static List<Node> findNamedChild( Node node, String elementName )
     {
         List<Node> result = new ArrayList<Node>();
         NodeList childNodes = node.getChildNodes();
         for ( int i = 0; i < childNodes.getLength(); i++ )
         {
             Node item = childNodes.item( i );
             if ( elementName.equals( item.getNodeName() ) )
             {
                 result.add( item );
             }
         }
         return result;
     }

     private static Node findSingleChild( Node node, String elementName )
         throws MojoExecutionException
     {
         List<Node> elementsByTagName = findNamedChild( node, elementName );
         if ( elementsByTagName.isEmpty() )
         {
             return null;
         }
         if ( elementsByTagName.size() > 1 )
         {
             throw new MojoExecutionException( "Multiple " + elementName + "in plugin-help.xml" );
         }
         return elementsByTagName.get( 0 );
     }

     private void writeGoal( StringBuilder sb, String goalPrefix, Element mojo )
         throws MojoExecutionException
     {
         String mojoGoal = getValue( mojo, "goal" );
         Node configurationElement = findSingleChild( mojo, "configuration" );
         Node description = findSingleChild( mojo, "description" );
         if ( goal == null || goal.length() <= 0 || mojoGoal.equals( goal ) )
         {
             append( sb, goalPrefix + ":" + mojoGoal, 0 );
             Node deprecated = findSingleChild( mojo, "deprecated" );
             if ( ( deprecated != null ) && isNotEmpty( deprecated.getTextContent() ) )
             {
                 append( sb, "Deprecated. " + deprecated.getTextContent(), 1 );
                 if ( detail && description != null )
                 {
                     append( sb, "", 0 );
                     append( sb, description.getTextContent(), 1 );
                 }
             }
             else if ( description != null )
             {
                 append( sb, description.getTextContent(), 1 );
             }
             append( sb, "", 0 );

             if ( detail )
             {
                 Node parametersNode = getSingleChild( mojo, "parameters" );
                 List<Node> parameters = findNamedChild( parametersNode, "parameter" );
                 append( sb, "Available parameters:", 1 );
                 append( sb, "", 0 );

                 for ( Node parameter : parameters )
                 {
                     writeParameter( sb, parameter, configurationElement );
                 }
             }
         }
     }

     private void writeParameter( StringBuilder sb, Node parameter, Node configurationElement )
         throws MojoExecutionException
     {
         String parameterName = getValue( parameter, "name" );
         String parameterDescription = getValue( parameter, "description" );

         Element fieldConfigurationElement = null;
         if ( configurationElement != null )
         {
           fieldConfigurationElement =  (Element) findSingleChild( configurationElement, parameterName );
         }

         String parameterDefaultValue = "";
         if ( fieldConfigurationElement != null && fieldConfigurationElement.hasAttribute( "default-value" ) )
         {
             parameterDefaultValue = " (Default: " + fieldConfigurationElement.getAttribute( "default-value" ) + ")";
         }
         append( sb, parameterName + parameterDefaultValue, 2 );
         Node deprecated = findSingleChild( parameter, "deprecated" );
         if ( ( deprecated != null ) && isNotEmpty( deprecated.getTextContent() ) )
         {
             append( sb, "Deprecated. " + deprecated.getTextContent(), 3 );
             append( sb, "", 0 );
         }
         append( sb, parameterDescription, 3 );
         if ( "true".equals( getValue( parameter, "required" ) ) )
         {
             append( sb, "Required: Yes", 3 );
         }
         if ( ( fieldConfigurationElement != null ) && isNotEmpty( fieldConfigurationElement.getTextContent() ) )
         {
             String property = getPropertyFromExpression( fieldConfigurationElement.getTextContent() );
             append( sb, "User property: " + property, 3 );
         }

         append( sb, "", 0 );
     }

     /**
      * <p>Repeat a String <code>n</code> times to form a new string.</p>
      *
      * @param str    String to repeat
      * @param repeat number of times to repeat str
      * @return String with repeated String
      * @throws NegativeArraySizeException if <code>repeat &lt; 0</code>
      * @throws NullPointerException       if str is <code>null</code>
      */
     private static String repeat( String str, int repeat )
     {
         StringBuilder buffer = new StringBuilder( repeat * str.length() );

         for ( int i = 0; i < repeat; i++ )
         {
             buffer.append( str );
         }

         return buffer.toString();
     }

     /**
      * Append a description to the buffer by respecting the indentSize and lineLength parameters.
      * <b>Note</b>: The last character is always a new line.
      *
      * @param sb          The buffer to append the description, not <code>null</code>.
      * @param description The description, not <code>null</code>.
      * @param indent      The base indentation level of each line, must not be negative.
      */
     private void append( StringBuilder sb, String description, int indent )
     {
         for ( String line : toLines( description, indent, indentSize, lineLength ) )
         {
             sb.append( line ).append( '\n' );
         }
     }

     /**
      * Splits the specified text into lines of convenient display length.
      *
      * @param text       The text to split into lines, must not be <code>null</code>.
      * @param indent     The base indentation level of each line, must not be negative.
      * @param indentSize The size of each indentation, must not be negative.
      * @param lineLength The length of the line, must not be negative.
      * @return The sequence of display lines, never <code>null</code>.
      * @throws NegativeArraySizeException if <code>indent &lt; 0</code>
      */
     private static List<String> toLines( String text, int indent, int indentSize, int lineLength )
     {
         List<String> lines = new ArrayList<String>();

         String ind = repeat( "\t", indent );

         String[] plainLines = text.split( "(\r\n)|(\r)|(\n)" );

         for ( String plainLine : plainLines )
         {
             toLines( lines, ind + plainLine, indentSize, lineLength );
         }

         return lines;
     }

     /**
      * Adds the specified line to the output sequence, performing line wrapping if necessary.
      *
      * @param lines      The sequence of display lines, must not be <code>null</code>.
      * @param line       The line to add, must not be <code>null</code>.
      * @param indentSize The size of each indentation, must not be negative.
      * @param lineLength The length of the line, must not be negative.
      */
     private static void toLines( List<String> lines, String line, int indentSize, int lineLength )
     {
         int lineIndent = getIndentLevel( line );
         StringBuilder buf = new StringBuilder( 256 );

         String[] tokens = line.split( " +" );

         for ( String token : tokens )
         {
             if ( buf.length() > 0 )
             {
                 if ( buf.length() + token.length() >= lineLength )
                 {
                     lines.add( buf.toString() );
                     buf.setLength( 0 );
                     buf.append( repeat( " ", lineIndent * indentSize ) );
                 }
                 else
                 {
                     buf.append( ' ' );
                 }
             }

             for ( int j = 0; j < token.length(); j++ )
             {
                 char c = token.charAt( j );
                 if ( c == '\t' )
                 {
                     buf.append( repeat( " ", indentSize - buf.length() % indentSize ) );
                 }
                 else if ( c == '\u00A0' )
                 {
                     buf.append( ' ' );
                 }
                 else
                 {
                     buf.append( c );
                 }
             }
         }
         lines.add( buf.toString() );
     }

     /**
      * Gets the indentation level of the specified line.
      *
      * @param line The line whose indentation level should be retrieved, must not be <code>null</code>.
      * @return The indentation level of the line.
      */
     private static int getIndentLevel( String line )
     {
         int level = 0;
         for ( int i = 0; i < line.length() && line.charAt( i ) == '\t'; i++ )
         {
             level++;
         }
         for ( int i = level + 1; i <= level + 4 && i < line.length(); i++ )
         {
             if ( line.charAt( i ) == '\t' )
             {
                 level++;
                 break;
             }
         }
         return level;
     }

     private static String getPropertyFromExpression( String expression )
     {
         if ( expression != null && expression.startsWith( "${" ) && expression.endsWith( "}" )
             && !expression.substring( 2 ).contains( "${" ) )
         {
             // expression="${xxx}" -> property="xxx"
             return expression.substring( 2, expression.length() - 1 );
         }
         // no property can be extracted
         return null;
     }
 }
	## Licensed to the Apache Software Foundation (ASF) under one
	## or more contributor license agreements. See the NOTICE file
	## distributed with this work for additional information
	## regarding copyright ownership. The ASF licenses this file
	## to you under the Apache License, Version 2.0 (the
	## "License"); you may not use this file except in compliance
	## with the License. You may obtain a copy of the License at
	##
	## http://www.apache.org/licenses/LICENSE-2.0
	##
	## Unless required by applicable law or agreed to in writing,
	## software distributed under the License is distributed on an
	## "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
	## KIND, either express or implied. See the License for the
	## specific language governing permissions and limitations
	## under the License.
	#if ($helpPackageName.length()>0)
	package ${helpPackageName};
	#end

	import org.apache.maven.plugin.AbstractMojo;
	import org.apache.maven.plugin.MojoExecutionException;
	#if ( $useAnnotations )
	import org.apache.maven.plugins.annotations.Mojo;
	import org.apache.maven.plugins.annotations.Parameter;
	#end

	import org.w3c.dom.Document;
	import org.w3c.dom.Element;
	import org.w3c.dom.Node;
	import org.w3c.dom.NodeList;
	import org.xml.sax.SAXException;

	import javax.xml.parsers.DocumentBuilder;
	import javax.xml.parsers.DocumentBuilderFactory;
	import javax.xml.parsers.ParserConfigurationException;
	import java.io.IOException;
	import java.io.InputStream;
	import java.util.ArrayList;
	import java.util.List;

	/**
	* Display help information on ${artifactId}.<br>
	* Call <code>mvn ${goalPrefix}:help -Ddetail=true -Dgoal=<goal-name></code> to display parameter details.
	* @author maven-plugin-tools
	#if ( !$useAnnotations )
	* @goal help
	* @requiresProject false
	* @threadSafe
	#end
	*/
	#if ( $useAnnotations )
	@Mojo( name = "help", requiresProject = false, threadSafe = true )
	#end
	public class HelpMojo
	extends AbstractMojo
	{
	/**
	* If <code>true</code>, display all settable properties for each goal.
	*
	#if ( !$useAnnotations )
	* @parameter property="detail" default-value="false"
	#end
	*/
	#if ( $useAnnotations )
	@Parameter( property = "detail", defaultValue = "false" )
	#end
	private boolean detail;

	/**
	* The name of the goal for which to show help. If unspecified, all goals will be displayed.
	*
	#if ( !$useAnnotations )
	* @parameter property="goal"
	#end
	*/
	#if ( $useAnnotations )
	@Parameter( property = "goal" )
	#end
	private java.lang.String goal;

	/**
	* The maximum length of a display line, should be positive.
	*
	#if ( !$useAnnotations )
	* @parameter property="lineLength" default-value="80"
	#end
	*/
	#if ( $useAnnotations )
	@Parameter( property = "lineLength", defaultValue = "80" )
	#end
	private int lineLength;

	/**
	* The number of spaces per indentation level, should be positive.
	*
	#if ( !$useAnnotations )
	* @parameter property="indentSize" default-value="2"
	#end
	*/
	#if ( $useAnnotations )
	@Parameter( property = "indentSize", defaultValue = "2" )
	#end
	private int indentSize;

	// groupId/artifactId/plugin-help.xml
	private static final String PLUGIN_HELP_PATH =
	"/${pluginHelpPath}";

	private static final int DEFAULT_LINE_LENGTH = 80;

	private Document build()
	throws MojoExecutionException
	{
	getLog().debug( "load plugin-help.xml: " + PLUGIN_HELP_PATH );
	try ( InputStream is = getClass().getResourceAsStream( PLUGIN_HELP_PATH ) )
	{
	DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
	DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
	return dBuilder.parse( is );
	}
	catch ( IOException e )
	{
	throw new MojoExecutionException( e.getMessage(), e );
	}
	catch ( ParserConfigurationException e )
	{
	throw new MojoExecutionException( e.getMessage(), e );
	}
	catch ( SAXException e )
	{
	throw new MojoExecutionException( e.getMessage(), e );
	}
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	public void execute()
	throws MojoExecutionException
	{
	if ( lineLength <= 0 )
	{
	getLog().warn( "The parameter 'lineLength' should be positive, using '80' as default." );
	lineLength = DEFAULT_LINE_LENGTH;
	}
	if ( indentSize <= 0 )
	{
	getLog().warn( "The parameter 'indentSize' should be positive, using '2' as default." );
	indentSize = 2;
	}

	Document doc = build();

	StringBuilder sb = new StringBuilder();
	Node plugin = getSingleChild( doc, "plugin" );


	String name = getValue( plugin, "name" );
	String version = getValue( plugin, "version" );
	String id = getValue( plugin, "groupId" ) + ":" + getValue( plugin, "artifactId" ) + ":" + version;
	if ( isNotEmpty( name ) && !name.contains( id ) )
	{
	append( sb, name + " " + version, 0 );
	}
	else
	{
	if ( isNotEmpty( name ) )
	{
	append( sb, name, 0 );
	}
	else
	{
	append( sb, id, 0 );
	}
	}
	append( sb, getValue( plugin, "description" ), 1 );
	append( sb, "", 0 );

	//<goalPrefix>plugin</goalPrefix>
	String goalPrefix = getValue( plugin, "goalPrefix" );

	Node mojos1 = getSingleChild( plugin, "mojos" );

	List<Node> mojos = findNamedChild( mojos1, "mojo" );

	if ( goal == null \|\| goal.length() <= 0 )
	{
	append( sb, "This plugin has " + mojos.size() + ( mojos.size() > 1 ? " goals:" : " goal:" ), 0 );
	append( sb, "", 0 );
	}

	for ( Node mojo : mojos )
	{
	writeGoal( sb, goalPrefix, (Element) mojo );
	}

	if ( getLog().isInfoEnabled() )
	{
	getLog().info( sb.toString() );
	}
	}


	private static boolean isNotEmpty( String string )
	{
	return string != null && string.length() > 0;
	}

	private static String getValue( Node node, String elementName )
	throws MojoExecutionException
	{
	return getSingleChild( node, elementName ).getTextContent();
	}

	private static Node getSingleChild( Node node, String elementName )
	throws MojoExecutionException
	{
	List<Node> namedChild = findNamedChild( node, elementName );
	if ( namedChild.isEmpty() )
	{
	throw new MojoExecutionException( "Could not find " + elementName + " in plugin-help.xml" );
	}
	if ( namedChild.size() > 1 )
	{
	throw new MojoExecutionException( "Multiple " + elementName + " in plugin-help.xml" );
	}
	return namedChild.get( 0 );
	}

	private static List<Node> findNamedChild( Node node, String elementName )
	{
	List<Node> result = new ArrayList<Node>();
	NodeList childNodes = node.getChildNodes();
	for ( int i = 0; i < childNodes.getLength(); i++ )
	{
	Node item = childNodes.item( i );
	if ( elementName.equals( item.getNodeName() ) )
	{
	result.add( item );
	}
	}
	return result;
	}

	private static Node findSingleChild( Node node, String elementName )
	throws MojoExecutionException
	{
	List<Node> elementsByTagName = findNamedChild( node, elementName );
	if ( elementsByTagName.isEmpty() )
	{
	return null;
	}
	if ( elementsByTagName.size() > 1 )
	{
	throw new MojoExecutionException( "Multiple " + elementName + "in plugin-help.xml" );
	}
	return elementsByTagName.get( 0 );
	}

	private void writeGoal( StringBuilder sb, String goalPrefix, Element mojo )
	throws MojoExecutionException
	{
	String mojoGoal = getValue( mojo, "goal" );
	Node configurationElement = findSingleChild( mojo, "configuration" );
	Node description = findSingleChild( mojo, "description" );
	if ( goal == null \|\| goal.length() <= 0 \|\| mojoGoal.equals( goal ) )
	{
	append( sb, goalPrefix + ":" + mojoGoal, 0 );
	Node deprecated = findSingleChild( mojo, "deprecated" );
	if ( ( deprecated != null ) && isNotEmpty( deprecated.getTextContent() ) )
	{
	append( sb, "Deprecated. " + deprecated.getTextContent(), 1 );
	if ( detail && description != null )
	{
	append( sb, "", 0 );
	append( sb, description.getTextContent(), 1 );
	}
	}
	else if ( description != null )
	{
	append( sb, description.getTextContent(), 1 );
	}
	append( sb, "", 0 );

	if ( detail )
	{
	Node parametersNode = getSingleChild( mojo, "parameters" );
	List<Node> parameters = findNamedChild( parametersNode, "parameter" );
	append( sb, "Available parameters:", 1 );
	append( sb, "", 0 );

	for ( Node parameter : parameters )
	{
	writeParameter( sb, parameter, configurationElement );
	}
	}
	}
	}

	private void writeParameter( StringBuilder sb, Node parameter, Node configurationElement )
	throws MojoExecutionException
	{
	String parameterName = getValue( parameter, "name" );
	String parameterDescription = getValue( parameter, "description" );

	Element fieldConfigurationElement = null;
	if ( configurationElement != null )
	{
	fieldConfigurationElement = (Element) findSingleChild( configurationElement, parameterName );
	}

	String parameterDefaultValue = "";
	if ( fieldConfigurationElement != null && fieldConfigurationElement.hasAttribute( "default-value" ) )
	{
	parameterDefaultValue = " (Default: " + fieldConfigurationElement.getAttribute( "default-value" ) + ")";
	}
	append( sb, parameterName + parameterDefaultValue, 2 );
	Node deprecated = findSingleChild( parameter, "deprecated" );
	if ( ( deprecated != null ) && isNotEmpty( deprecated.getTextContent() ) )
	{
	append( sb, "Deprecated. " + deprecated.getTextContent(), 3 );
	append( sb, "", 0 );
	}
	append( sb, parameterDescription, 3 );
	if ( "true".equals( getValue( parameter, "required" ) ) )
	{
	append( sb, "Required: Yes", 3 );
	}
	if ( ( fieldConfigurationElement != null ) && isNotEmpty( fieldConfigurationElement.getTextContent() ) )
	{
	String property = getPropertyFromExpression( fieldConfigurationElement.getTextContent() );
	append( sb, "User property: " + property, 3 );
	}

	append( sb, "", 0 );
	}

	/**
	* <p>Repeat a String <code>n</code> times to form a new string.</p>
	*
	* @param str String to repeat
	* @param repeat number of times to repeat str
	* @return String with repeated String
	* @throws NegativeArraySizeException if <code>repeat < 0</code>
	* @throws NullPointerException if str is <code>null</code>
	*/
	private static String repeat( String str, int repeat )
	{
	StringBuilder buffer = new StringBuilder( repeat * str.length() );

	for ( int i = 0; i < repeat; i++ )
	{
	buffer.append( str );
	}

	return buffer.toString();
	}

	/**
	* Append a description to the buffer by respecting the indentSize and lineLength parameters.
	* <b>Note</b>: The last character is always a new line.
	*
	* @param sb The buffer to append the description, not <code>null</code>.
	* @param description The description, not <code>null</code>.
	* @param indent The base indentation level of each line, must not be negative.
	*/
	private void append( StringBuilder sb, String description, int indent )
	{
	for ( String line : toLines( description, indent, indentSize, lineLength ) )
	{
	sb.append( line ).append( '\n' );
	}
	}

	/**
	* Splits the specified text into lines of convenient display length.
	*
	* @param text The text to split into lines, must not be <code>null</code>.
	* @param indent The base indentation level of each line, must not be negative.
	* @param indentSize The size of each indentation, must not be negative.
	* @param lineLength The length of the line, must not be negative.
	* @return The sequence of display lines, never <code>null</code>.
	* @throws NegativeArraySizeException if <code>indent < 0</code>
	*/
	private static List<String> toLines( String text, int indent, int indentSize, int lineLength )
	{
	List<String> lines = new ArrayList<String>();

	String ind = repeat( "\t", indent );

	String[] plainLines = text.split( "(\r\n)\|(\r)\|(\n)" );

	for ( String plainLine : plainLines )
	{
	toLines( lines, ind + plainLine, indentSize, lineLength );
	}

	return lines;
	}

	/**
	* Adds the specified line to the output sequence, performing line wrapping if necessary.
	*
	* @param lines The sequence of display lines, must not be <code>null</code>.
	* @param line The line to add, must not be <code>null</code>.
	* @param indentSize The size of each indentation, must not be negative.
	* @param lineLength The length of the line, must not be negative.
	*/
	private static void toLines( List<String> lines, String line, int indentSize, int lineLength )
	{
	int lineIndent = getIndentLevel( line );
	StringBuilder buf = new StringBuilder( 256 );

	String[] tokens = line.split( " +" );

	for ( String token : tokens )
	{
	if ( buf.length() > 0 )
	{
	if ( buf.length() + token.length() >= lineLength )
	{
	lines.add( buf.toString() );
	buf.setLength( 0 );
	buf.append( repeat( " ", lineIndent * indentSize ) );
	}
	else
	{
	buf.append( ' ' );
	}
	}

	for ( int j = 0; j < token.length(); j++ )
	{
	char c = token.charAt( j );
	if ( c == '\t' )
	{
	buf.append( repeat( " ", indentSize - buf.length() % indentSize ) );
	}
	else if ( c == '\u00A0' )
	{
	buf.append( ' ' );
	}
	else
	{
	buf.append( c );
	}
	}
	}
	lines.add( buf.toString() );
	}

	/**
	* Gets the indentation level of the specified line.
	*
	* @param line The line whose indentation level should be retrieved, must not be <code>null</code>.
	* @return The indentation level of the line.
	*/
	private static int getIndentLevel( String line )
	{
	int level = 0;
	for ( int i = 0; i < line.length() && line.charAt( i ) == '\t'; i++ )
	{
	level++;
	}
	for ( int i = level + 1; i <= level + 4 && i < line.length(); i++ )
	{
	if ( line.charAt( i ) == '\t' )
	{
	level++;
	break;
	}
	}
	return level;
	}

	private static String getPropertyFromExpression( String expression )
	{
	if ( expression != null && expression.startsWith( "${" ) && expression.endsWith( "}" )
	&& !expression.substring( 2 ).contains( "${" ) )
	{
	// expression="${xxx}" -> property="xxx"
	return expression.substring( 2, expression.length() - 1 );
	}
	// no property can be extracted
	return null;
	}
	}