/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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 org.apache.commons.functor.example.map;
  
  import java.lang.reflect.Array;
  import java.util.Collection;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.commons.functor.BinaryFunction;
  import org.apache.commons.functor.BinaryProcedure;
  import org.apache.commons.functor.NullaryProcedure;
  import org.apache.commons.functor.Predicate;
  import org.apache.commons.functor.Procedure;
  
  /**
   * @version $Revision: 1508677 $ $Date: 2013-07-31 00:48:02 +0200 (Mi, 31 Jul 2013) $
   */
  @SuppressWarnings("unchecked")
  public class FunctoredMap<K, V> implements Map<K, V> {
      public FunctoredMap(Map<? super K, ? super V> map) {
          this.map = (Map<K, V>)map;
      }
  
      @Override
      public int hashCode() {
          return map.hashCode();
      }
  
      @Override
      public String toString() {
          return map.toString();
      }
  
      public Collection<V> values() {
          return map.values();
      }
  
      public Set<K> keySet() {
          return map.keySet();
      }
  
      public V get(Object key) {
          return onget.evaluate(map, (K)key);
      }
  
      public void clear() {
          onclear.run(map);
      }
  
      public int size() {
          return map.size();
      }
  
      public Object put(Object key, Object value) {
          return onput.evaluate(map, new Object[] { key, value });
      }
  
      public void putAll(Map<? extends K, ? extends V> src) {
          onputall.run(map, (Map<K, V>)src);
      }
  
      public Set<Map.Entry<K, V>> entrySet() {
          return map.entrySet();
      }
  
      public boolean containsKey(Object key) {
          return map.containsKey(key);
      }
  
      public boolean isEmpty() {
          return map.isEmpty();
      }
  
      public V remove(Object key) {
          return onremove.evaluate(map, (K)key);
      }
  
      @Override
      public boolean equals(Object obj) {
          return map.equals(obj);
      }
  
      public boolean containsValue(Object value) {
          return map.containsValue(value);
     }
 
     // protected
 
     protected void setOnClear(Procedure<Map<K, V>> procedure) {
         onclear = procedure;
     }
 
     protected void setOnPut(BinaryFunction<Map<K, V>, Object[], V> function) {
         onput = function;
     }
 
     protected void setOnGet(BinaryFunction<Map<K, V>, K, V> function) {
         onget = function;
     }
 
     protected void setOnPutAll(BinaryProcedure<Map<K, V>, Map<K, V>> procedure) {
         onputall = procedure;
     }
 
     protected void setOnRemove(BinaryFunction<Map<K, V>, K, V> function) {
         onremove = function;
     }
 
     // attributes
 
     protected BinaryFunction<Map<K, V>, Object[], V> DEFAULT_ON_PUT = new BinaryFunction<Map<K, V>, Object[], V>() {
         public V evaluate(Map<K, V> a, Object[] b) {
             Map<K, V> map = a;
             K key = (K)Array.get(b,0);
             V value = (V)Array.get(b,1);
             return map.put(key,value);
         }
     };
 
     private BinaryFunction<Map<K, V>, Object[], V> onput = DEFAULT_ON_PUT;
 
     protected BinaryFunction<Map<K, V>, K, V> DEFAULT_ON_GET = new BinaryFunction<Map<K, V>, K, V>() {
         public V evaluate(Map<K, V> map, K key) {
             return map.get(key);
         }
     };
 
     private BinaryFunction<Map<K, V>, K, V> onget = DEFAULT_ON_GET;
     
     protected BinaryProcedure<Map<K, V>, Map<K, V>> DEFAULT_ON_PUT_ALL = new BinaryProcedure<Map<K, V>, Map<K, V>>() {
         public void run(Map<K, V> a, Map<K, V> b) {
             Map<K, V> dest = a;
             Map<K, V> src = b;
             dest.putAll(src);
         }
     };
 
     private BinaryProcedure<Map<K, V>, Map<K, V>> onputall = DEFAULT_ON_PUT_ALL;
 
     protected BinaryFunction<Map<K, V>, K, V> DEFAULT_ON_REMOVE = new BinaryFunction<Map<K, V>, K, V>() {
         public V evaluate(Map<K, V> a, K key) {
             Map<K, V> map = a;
             return map.remove(key);
         }
     };
 
     private BinaryFunction<Map<K, V>, K, V> onremove = DEFAULT_ON_REMOVE;
 
     protected Procedure<Map<K, V>> DEFAULT_ON_CLEAR = new Procedure<Map<K, V>>() {
         public void run(Map<K, V> map) {
             map.clear();
         }
     };
 
     private Procedure<Map<K, V>> onclear = DEFAULT_ON_CLEAR;
 
     private Map<K, V> map = null;
 
     // inner classes
 
     protected static class ContainsKey implements Predicate<Object> {
         ContainsKey(Map<?, ?> map) {
             this.map = map;
         }
 
         public boolean test(Object obj) {
             return map.containsKey(obj);
         }
 
         private Map<?, ?> map = null;
     }
 
     protected static class Throw<K, V> implements NullaryProcedure, Procedure<Map<K, V>>, BinaryProcedure<K, V> {
         Throw(RuntimeException e) {
             this.klass = e.getClass();
         }
 
         public void run() {
             try {
                 throw (RuntimeException)(klass.newInstance());
             } catch(IllegalAccessException e) {
                 throw new RuntimeException();
             } catch (InstantiationException e) {
                 throw new RuntimeException();
             }
         }
 
         public void run(Map<K, V> obj) {
             run();
         }
 
         public void run(K a, V b) {
             run();
         }
 
         private Class<?> klass = null;
     }
 }