code: package com.medallia.word2vec.util;
  
  
  /** Helper to create {@link org.apache.log4j.NDC} for nested diagnostic contexts */
  public class NDC implements AC {
  	private final int size;
  
  	/** Push all the contexts given and pop them when auto-closed */
  	public static NDC push(String... context) {
  		return new NDC(context);
  	}
  
  	/** Construct an {@link AutoCloseable} {@link NDC} with the given contexts */
  	private NDC(String... context) {
  		for (String c : context) {
  			org.apache.log4j.NDC.push("[" + c + "]");
  		}
  		this.size = context.length;
  	}
  
  	@Override
  	public void close() {
  		for (int i = 0; i < size; i++) {
  			org.apache.log4j.NDC.pop();
  		}
  	}
  }
  