[UpdaterEditor] Provide support for custom node selection/navigation

package org.hippoecm.frontend.plugins.cms.admin.updater

import org.onehippo.repository.update.BaseNodeUpdateVisitor
import javax.jcr.Node
import javax.jcr.RepositoryException
import javax.jcr.Session

class UpdaterTemplate extends BaseNodeUpdateVisitor {

  boolean logSkippedNodePaths() {
    return false // don't log skipped node paths
  }

  boolean skipCheckoutNodes() {
    return false // return true for readonly visitors and/or updates unrelated to versioned content
  }

  Node firstNode(final Session session) throws RepositoryException {
    return null // implement when using custom node selection/navigation
  }

  Node nextNode() throws RepositoryException {
    return null // implement when using custom node selection/navigation
  }

  boolean doUpdate(Node node) {
    log.debug "Updating node ${node.path}"
    return false
  }

  boolean undoUpdate(Node node) {
    throw new UnsupportedOperationException('Updater does not implement undoUpdate method')
  }
}