I am using Velocity to generate different artifacts in my project, including Java Hibernate Entities.
Here is an example of my template:
#foreach( $column in $columns )
#if ($column.columnID != "id")
#if ($column.isColumnAnIdentifier)
@Id
#end
#if ($column.isColumnValueGenerated)
@GeneratedValue
#end
#if ($column.isColumnValueNotNull)
@NotNull
#end
#if ($column.columnAllowedValues)
@Enumerated(EnumType.STRING)
#end
#if ($column.isColumnValueUnique)
@Column(unique=true)
#elseif ($column.isColumnJoinedManyToOne)
@ManyToOne
@JoinColumn(name = "$column.columnJoinByID")
#else
@Column
#end
private #if ($column.columnAllowedValues) $column.columnID.toUpperCase() #else $column.columnType #end $column.columnID;
#end
#end
The problem is that the generated code looks like this:
@Column
private String vendor;
@NotNull
@Column(unique=true)
private String name;
@Column
private Integer min_quantity;
@Column
private String description;
@Column
private Boolean active;
I tried the suggested solution with adding ## after each line, it does not help. Is there a way to force Velocity to keep whitespace as defined in the template?
VelocityEngine velocityEngine = new VelocityEngine();
velocityEngine.setProperty(RESOURCE_LOADER_PROPERTY, RESOURCE_LOADER_VALUE);
velocityEngine.setProperty(CLASSPATH_RESOURCE_LOADER_PROPERTY, ClasspathResourceLoader.class.getName());
velocityEngine.init();
Template velocityTemplate = velocityEngine.getTemplate(TEMPLATE_RESOURCES_ROOT_FOLDER + "/" + templateFileName);;
StringWriter writer = new StringWriter();
velocityTemplate.merge(velocityContext, writer);
writeToFile(writer, destinationFilePath);
The ##
at the end of lines is not enough, you also need to remove the Velocity indentation.
An alternative, to keep the indentation, is to indent with Velocity comments:
#foreach( $column in $columns )##
#**##if ($column.columnID != "id")##
#* *##if ($column.isColumnAnIdentifier)##
@Id
#* *##end
#* *##if ($column.isColumnValueGenerated)##
...
but I concede it is rather ugly.
The upcoming Velocity 2.0 release adds a space gobbling option , active by default, with does exactly what you want. The latest release candidate is available here .
I store my files without any indentation, adding it when I edit and removing it afterwards. You'll need to run this on Linux or Cygwin:
Safely ident leading Velocity instructions:
gawk '
function ltrim(s) { sub(/^[ \t\r\n]+/, "", s); return s }
BEGIN {p=""}
/^ *#(end|else)\>/ {p = substr(p,5)}
/^ *#(if|end|set|foreach|else|#)\>/ {
printf "%s%s\n", p, ltrim($0);
if($0 ~ /^ *#(if|foreach|else)\>/) p = p " "; next;}
1'
Remove indentations:
sed 's/^ #/#/'
If you story these as scripts (and use vi/vim) you can then use:
:%!VelocityIndent
...otherwise just pipe the file through the script.
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