CODEWITHSUNDEEP
javastruts2yamlstruts2-jquery
Balwant Kumar Singh
Balwant Kumar Singh

Reputation: 1178

Updating values in a yaml file using snakeYaml

Is there any way to edit/delete the values in a YAMLfile using java.

I'm using struts2-jquery-grid where the data will be populated from YAML file. Now, If I edit the field(s), it should be saved in YAML file. I am able to read the value from and write the values to a file in YAML format using yaml.load() and yaml.dump() respectively. But, I don't have any idea to do edit and delete the specific field.

I've gone through http://code.google.com/p/snakeyaml/wiki/Documentation#Dumping_YAML link where I read that we can use template processor and other options like defining order of java bean property, comments to make ease of yaml. But all those doesn't make any sense to me.

Here is my code to serialize the list of object called assumption here. In gridModel.add(assumption);, I'm storing the values of class Assumption(bean class with fetters and setters) to the list here in gridModel. 

       gridModel.add(assumption);

       try {

        FileWriter pr=new FileWriter("D:/yaml.yaml");

        DumperOptions options = new DumperOptions();

         options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);

        Yaml yaml = new Yaml(options);
        String output=yaml.dump(gridModel);//,Tag.MAP, null);
        pr.write(output);
        System.out.print(pr.toString());
        System.out.println();

        pr.close();
        }catch(Exception e){
            e.printStackTrace();
        }

The outout I'm getting in a file called yaml.yaml as:

For De-serialization the code is:

            InputStream input = new FileInputStream(new File("D:/yaml.yaml"));
    Yaml yaml = new Yaml();
    for (Object data : yaml.loadAll(input))
        System.out.println("Data:"+data);

The output to the console is :

Data:[Assumption [column1=1, column2=Balwant, column3=SPJ, column4=rerer, column5=null], Assumption [column1=, column2=Vikas, column3=RNC, column4=erer, column5=null], Assumption [column1=3, column2=, column3=PNBE, column4=erer, column5=null], Assumption [column1=4, column2=Diwakar, column3=BGP, column4=rerer, column5=null], Assumption [column1=5, column2=Ajay, column3=Godda, column4=, column5=null]]

I'm new to yaml and struts2. So, please answer a clean solution. Correct me, if I'm wrong while describing the requirement. Thanks in advance...

Upvotes: 3

Views: 5826

Answers (1)

Balwant Kumar Singh
Balwant Kumar Singh

Reputation: 1178

The only way I think to edit is to overwrite the existing yaml. We need to get the values from grid and overwrite ti to the existing one.

Upvotes: 0

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