Free up action

[vicding-mi]

This PR decouples the actions from the main package. After adoption of the package, extra actions can be invoked by adding particular actions to the config file

    <actions>
        <format match="prefix" value="http://www.clarin.eu/cmd/1">
...
            <action type="nl.knaw.huc.di.sd.HelloWorldAction" file="extra-actions.jar" />
            <action type="nl.mpi.oai.harvester.action.SplitAction" />
        </format>
    </actions>

The line <action type="nl.knaw.huc.di.sd.HelloWorldAction" file="extra-actions.jar" />, indicates a new action and informs where to get the jar contains the definition of it.

<action type="nl.mpi.oai.harvester.action.SplitAction" /> indicates that when there is no jar file given, the harvester will fall back to class path for action look up. The internal split action is used but called with its full qualified name.

The action JAR should implement, for example

package nl.knaw.huc.di.sd;


import nl.mpi.oai.harvester.action.Action;
import nl.mpi.oai.harvester.metadata.Metadata;

import java.util.List;

public class HelloWorldAction implements Action {
    @Override
    public boolean perform(List<Metadata> list) {
        System.out.println("Hello World! Performing!");
        return false;
    }

    @Override
    public Action clone() {
        System.out.println("Hello World! Cloning!");
        return null;
    }
}

[vicding-mi]

Almost accidentally removed the whole branch, merge the freed up action into dev first.