package org.etk.core.rest.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.ws.rs.core.MultivaluedMap;

public final class OutputHeadersMap extends HashMap<String, List<Object>> implements MultivaluedMap<String, Object> {

  /**
   * Generated by Eclipse.
   */
  private static final long serialVersionUID = 7932373258809348405L;

  /**
   * Default constructor.
   */
  public OutputHeadersMap() {
  }

  // MultivaluedMap

  /**
   * {@inheritDoc}
   */
  public void add(String key, Object value) {
    if (value == null)
      return;

    List<Object> l = getList(key);
    l.add(value);
  }

  /**
   * {@inheritDoc}
   */
  public Object getFirst(String key) {
    List<Object> l = get(key);
    return l != null && l.size() > 0 ? l.get(0) : null;
  }

  /**
   * {@inheritDoc}
   */
  public void putSingle(String key, Object value) {
    if (value == null)
      return;

    List<Object> l = getList(key);
    l.clear();
    l.add(value);
  }

  /**
   * Get List with specified key. If List does not exist new one be created.
   * 
   * @param key a key.
   * @return List<Object>
   */
  private List<Object> getList(String key) {
    List<Object> l = get(key);
    if (l == null) {
      l = new ArrayList<Object>();
      put(key, l);
    }

    return l;
  }

  // HashMap

  /**
   * {@inheritDoc}
   */
  @Override
  public boolean containsKey(Object key) {
    if (key != null)
      return super.containsKey(((String) key).toLowerCase());

    return super.containsKey(key);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public List<Object> get(Object key) {
    if (key != null)
      return super.get(((String) key).toLowerCase());

    return super.get(key);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public List<Object> put(String key, List<Object> value) {
    if (key != null)
      key = key.toLowerCase();

    return super.put(key, value);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void putAll(Map<? extends String, ? extends List<Object>> t) {
    for (Map.Entry<? extends String, ? extends List<Object>> e : t.entrySet())
      put(e.getKey(), e.getValue());
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public List<Object> remove(Object key) {
    if (key != null)
      return super.remove(((String) key).toLowerCase());

    return super.remove(key);
  }

}