AbstractCollectingVisitor.java

package sk.stuba.fiit.perconik.core.java.dom;

import java.util.Collections;
import java.util.List;

import javax.annotation.Nullable;

import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.ASTVisitor;

import static com.google.common.collect.Lists.newLinkedList;

abstract class AbstractCollectingVisitor<N extends ASTNode, R extends ASTNode> extends ASTVisitor {
  final List<R> result;

  AbstractCollectingVisitor() {
    super(true);

    this.result = newLinkedList();
  }

  final List<R> perform(@Nullable final N node) {
    if (node == null) {
      return Collections.emptyList();
    }

    node.accept(this);

    return this.result;
  }
}