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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.rapiddweller.common.context;

import com.rapiddweller.common.Context;

import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

/**
 * A thread-safe implementation of Context.
 * Created: 06.07.2007 06:30:43
 *
 * @author Volker Bergmann
 */
public class DefaultContext implements Context {

  private final Context defaults;

  /**
   * The Map.
   */
  protected Map map;

  /**
   * Instantiates a new Default context.
   */
  public DefaultContext() {
    this((Context) null);
  }

  /**
   * Instantiates a new Default context.
   *
   * @param defaults the defaults
   */
  public DefaultContext(Context defaults) {
    this.defaults = defaults;
    this.map = new HashMap<>();
  }

  /**
   * Instantiates a new Default context.
   *
   * @param map the map
   */
  public DefaultContext(Map map) {
    this.defaults = null;
    this.map = new HashMap<>(map);
  }

  /**
   * Instantiates a new Default context.
   *
   * @param props the props
   */
  public DefaultContext(Properties props) {
    this.defaults = null;
    this.map = new HashMap<>(props.size());
    for (Map.Entry entry : props.entrySet()) {
      this.map.put((String) entry.getKey(), entry.getValue());
    }
  }

  @Override
  public synchronized Object get(String key) {
    Object value = map.get(key);
    if (value == null && defaults != null) {
      value = defaults.get(key);
    }
    return value;
  }

  @Override
  public boolean contains(String key) {
    if (map.containsKey(key)) {
      return true;
    }
    return (defaults != null && defaults.contains(key));
  }

  @Override
  public synchronized void set(String key, Object value) {
    map.put(key, value);
  }

  @Override
  public synchronized Set> entrySet() {
    return map.entrySet();
  }

  /**
   * Sets all.
   *
   * @param  the type parameter
   * @param  the type parameter
   * @param map the map
   */
  public synchronized  void setAll(Hashtable map) {
    for (Map.Entry entry : map.entrySet()) {
      this.set(String.valueOf(entry.getKey()), entry.getValue());
    }
  }

  /**
   * Sets all.
   *
   * @param  the type parameter
   * @param  the type parameter
   * @param map the map
   */
  public synchronized  void setAll(Map map) {
    for (Map.Entry entry : map.entrySet()) {
      this.set(String.valueOf(entry.getKey()), entry.getValue());
    }
  }

  @Override
  public void remove(String key) {
    map.remove(key);
  }

  @Override
  public Set keySet() {
    return map.keySet();
  }

  @Override
  public synchronized String toString() {
    return map.toString();
  }

}