Class CaptureOutput

  • All Implemented Interfaces:
    TemplateModel, TemplateTransformModel

    public class CaptureOutput
    extends Object
    implements TemplateTransformModel
    Deprecated.
    Use block-assignments instead, like <assign x>...</assign>.
    A transform that captures the output of a block of FTL code and stores that in a variable.

    As this transform is initially present in the shared variable set, you can always access it from the templates:

     <@capture_output var="captured">
       ...
     </@capture_output>
     

    And later in the template you can use the captured output:

    ${captured}

    This transform requires one of three parameters: var, local, or global. Each of them specifies the name of the variable that stores the captured output, but the first creates a variable in a name-space (as <#assign>), the second creates a macro-local variable (as <#local>), and the last creates a global variable (as <#global>).

    In the case of an assignment within a namespace, there is an optional parameter namespace that indicates in which namespace to do the assignment. if this is omitted, the current namespace is used, and this will be, by far, the most common usage pattern.

    • Constructor Detail

      • CaptureOutput

        public CaptureOutput()
        Deprecated.
    • Method Detail

      • getWriter

        public Writer getWriter​(Writer out,
                                Map args)
                         throws TemplateModelException
        Deprecated.
        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.
        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.
        Returns:
        a writer to which the engine will feed the transformation input, or null if the transform does not support nested content (body). The returned writer can implement the TransformControl interface if it needs advanced control over the evaluation of the transformation body.
        Throws:
        TemplateModelException