empty value how to?

[Adam Jenkins]

Hi Everyone,

I'm trying to output something like

mykey: 

but if I use an empty string I get

mykey: ' '

(note, the space between the ' was added by me for clarity in this post, it is an empty char in the output)

if I use null I get

mykey: null

Is there anyway to configure it for the first output example?

Cheers

Adam

[Uday Bhaskar Sarma Seetamraju]

Hi Adam,

That is the default YAML behavior (to use quotes).

Strongly recommend you try to stick to it.

But, If you MUST AVOID any quotes ..

.. when generating YAML output, use:

org.yaml.snakeyaml.DumperOptions.ScalarStyle.PLAIN

FYI: the other alternatives are:-

public static enum ScalarStyle {
    DOUBLE_QUOTED('"'),
    SINGLE_QUOTED('\''),
    LITERAL('|'),
    FOLDED('>'),
    PLAIN((Character)null);

To use this ENUM, you need to ue an EMITTER .. ..  like shown below:

final org.yaml.snakeyaml.DumperOptions dopt = new DumperOptions(); // https://bitbucket.org/asomov/snakeyaml/src/default/src/main/java/org/yaml/snakeyaml/DumperOptions.java
dopt.setDefaultScalarStyle( org.yaml.snakeyaml.DumperOptions.ScalarStyle.PLAIN );

final org.yaml.snakeyaml.emitter.Emitter snakeEmitter = new Emitter( this.javaWriter, _dumperoptions );
final org.yaml.snakeyaml.resolver.Resolver resolver = new Resolver(); // we cannot pass NULL as 2nd parameter for BELOW-constructor for Serializer.
final org.yaml.snakeyaml.serializer.Serializer serializer = new Serializer( snakeEmitter, resolver, _dumperoptions, null );
try {
    serializer.open();
    serializer.serialize( _outputNode );
    serializer.close();

In the above SAMPLE CODE, I'm giving you ALL the intermediate classes .. .. in case, you'll need additional "flexibility" in what you output as YAML.

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[Adam Jenkins]

thanks heaps Uday :)