/*
 * 
 */
package org.jbpm.pvm.internal.script;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import javax.script.Bindings;

import org.jbpm.pvm.internal.env.EnvironmentImpl;

/**
 * @author Tom Baeyens
 * @author Huisheng Xu
 */
public class EnvironmentBindings implements Bindings {

  protected EnvironmentImpl environment;

  public EnvironmentBindings(String[] readContextNames, String writeContextName) {
    environment = EnvironmentImpl.getCurrent();
  }

  public Object get(Object key) {
	  Object v = environment.get((String) key);
	  if(v != null){
		  return v;
	  }
	  v = vars.get(key);
	  return v;
  }

  public boolean containsKey(Object key) {
    return get(key) != null;
  }

  private HashMap<String, Object> vars = new HashMap<String, Object>();
  public Object put(String key, Object value) {
	  boolean bypass = false;
	  
//	  bypass = "context".equals(key) ? true : bypass;
	  if(bypass){
		  return environment.get(key);
	  }else{
//		  vars.put(key, value);
		  return vars.get(key);
	  }
  }

  public void putAll(Map<? extends String, ? extends Object> toMerge) {
    // ignore puts
  }

  public Object remove(Object key) {
	  vars.remove(key);
    return null;
  }

  public void clear() {
	  vars.clear();
  }

  public boolean containsValue(Object value) {
    return vars.containsValue(value);
  }

  public Set<Entry<String, Object>> entrySet() {
    return vars.entrySet();
  }

  public boolean isEmpty() {
    return true;
  }

  public Set<String> keySet() {
    return vars.keySet();
  }

  public int size() {
    return vars.size();
  }

  public Collection<Object> values() {
    return vars.values();
  }
}