JAXB add element dynamically

abhishek221192 Published at Dev

abhishek221192

Is it possible to create XML Document by JAXB in such way. As copy is between mkdir and it will be dynamic

<project>
    <create>
        <mkdir dest="src/java"/>
        <copy src="test/src/java" dest="src/java" />
        <mkdir dest="{projectPath}/web/META-INF"/>
    </create>
</project>

My java Code :-

@XmlRootElement(name = "project")
public class Project {    
    private Create create;
    private Tree tree;    
    public Create getCreate() {
        return create;
    }    
    public void setCreate(Create create) {
        this.create = create;
    }    
    public Tree getTree() {
        return tree;
    }    
    public void setTree(Tree tree) {
        this.tree = tree;
    }    
}

@XmlRootElement
public class Create {

    private List<Mkdir> mkdir;    
    private Buildfile buildfile;  
    private Createfile createfile; 
    private Execute execute;
    private Copy copy;

   .....
}

I am able to achieve same by JDOM but i want to do it by Java Object.

Or i should use any other Java Library for this.

laune

You should use this annotation on class Create:

@XmlAccessorType(XmlAccessType.FIELD)
public class Create { ... }

Assuming there are no glitches in the classes you haven't shown (Tree, Buildfile, Mkdir,...) you can use the following code (where String serves as a replacement for all classes unknown to me) to marshal an XML file:

    void marshal() throws Exception {
        Project root = new Project();
        Create create = new Create();
        root.setCreate( create );
        create.getMkdir().add( "make dir1" );
        create.getMkdir().add( "make dir2" );
        create.setBuildfile( "buildfile1" );
        create.setCreatefile( "createfile1" );
        JAXBContext jc = JAXBContext.newInstance( Project.class );
        Marshaller m = jc.createMarshaller();
        m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        m.marshal( root, System.out );
    }

Output:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<project>
  <create>
    <mkdir>make dir1</mkdir>
    <mkdir>make dir2</mkdir>
    <buildfile>buildfile1</buildfile>
    <createfile>createfile1</createfile>
  </create>
</project>

I suppose the mkdirs can all be up front. If it has to be mixed, it's a little more complicated.

Edit You need a list capable of holding elements of mixed types, best subtypes of a common type.

@XmlAccessorType(XmlAccessType.FIELD)
public class Create {

    @XmlElements({
        @XmlElement(name = "mkdir", type = MkdirCommand.class),
        @XmlElement(name = "copy", type = CopyCommand.class)
    })
    private List cmds;
    public List getCmds(){
    if( cmds == null ) cmds = new ArrayList();
    return cmds;
    }
}

class Command {
}

class MkdirCommand extends Command {
    @XmlAttribute
    public String dest;
    public MkdirCommand( String d ){ dest = d; }
}

class CopyCommand extends Command {
    @XmlAttribute
    public String src;
    @XmlAttribute
    public String dest;
    public CopyCommand( String s, String d ){ src = s; dest = d; }
}

Output:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<project>
  <create>
    <mkdir dest="foo/dir1"/>
    <copy src="source" dest="target"/>
    <mkdir dest="bar/dir2"/>
  </create>
</project>

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