freemarker.template.utility

Class StandardCompress

java.lang.Object

freemarker.template.utility.StandardCompress

All Implemented Interfaces:

TemplateModel, TemplateTransformModel

public class StandardCompress
extends java.lang.Object
implements TemplateTransformModel

A filter that compresses each sequence of consecutive whitespace to a single line break (if the sequence contains a line break) or a single space. In addition, leading and trailing whitespace is completely removed.

Specify the transform parameter single_line = true to always compress to a single space instead of a line break.

The default buffer size can be overridden by specifying a buffer_size transform parameter (in bytes).

Note: The compress tag is implemented using this filter

Usage:
From java:

 SimpleHash root = new SimpleHash();

 root.put( "standardCompress", new freemarker.template.utility.StandardCompress() );

 ...
 

From your FreeMarker template:

 <transform standardCompress>
   <p>This    paragraph will have
       extraneous

 whitespace removed.</p>
 </transform>
 

Output:

 <p>This paragraph will have
 extraneous
 whitespace removed.</p>
 

Field Summary

Fields

Modifier and Type	Field and Description
static StandardCompress	INSTANCE

Fields inherited from interface freemarker.template.TemplateModel

NOTHING

Constructor Summary

Constructors

Constructor and Description
StandardCompress()
StandardCompress(int defaultBufferSize)

Method Summary

Modifier and Type	Method and Description
java.io.Writer	getWriter(java.io.Writer out, java.util.Map args) Returns a writer that will be used by the engine to feed the transformation input to the transform.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

INSTANCE

public static final StandardCompress INSTANCE

Constructor Detail

StandardCompress

public StandardCompress()

StandardCompress

public StandardCompress(int defaultBufferSize)

Parameters:

defaultBufferSize - the default amount of characters to buffer

Method Detail

getWriter

public java.io.Writer getWriter(java.io.Writer out,
                                java.util.Map args)
                         throws TemplateModelException

Description copied from interface: TemplateTransformModel

Returns a writer that will be used by the engine to feed the transformation input to the transform. Each call to this method must return a new instance of the writer so that the transformation is thread-safe.

This method should not throw RuntimeException, nor IOException that wasn't caused by writing to the output. Such exceptions should be catched inside the method and wrapped inside a TemplateModelException. (Note that setting Configuration.setWrapUncheckedExceptions(boolean) to true can mitigate the negative effects of implementations that throw RuntimeException-s.)

Specified by:

getWriter in interface TemplateTransformModel

Parameters:

out - the character stream to which to write the transformed output

args - the arguments (if any) passed to the transformation as a map of key/value pairs where the keys are strings and the arguments are TemplateModel instances. This is never null. (If you need to convert the template models to POJOs, you can use the utility methods in the DeepUnwrap class. Though it's recommended to work with TemplateModel-s directly.)

Returns:

The Writer to which the engine will write the content to transform, or null if the transform does not support nested content (body). The returned Writer may implements the TransformControl interface if it needs advanced control over the evaluation of the nested content. FreeMarker will call Writer.close() after the transform end-tag. Writer.close() must not close the Writer received as the out parameter (so if you are using a FilterWriter, you must override FilterWriter.close(), as by default that closes the wrapped Writer). Since 2.3.27 its also allowed to return the out writer as is, in which case it won't be closed.

Throws:

TemplateModelException - If any problem occurs that's not an IOException during writing the template output.