/*
    * 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.Procedure;
  import org.apache.commons.functor.UnaryPredicate;
  import org.apache.commons.functor.UnaryProcedure;
  
  /**
   * @version $Revision: 666157 $ $Date: 2008-06-10 17:34:23 +0200 (Tue, 10 Jun 2008) $
   * @author Rodney Waldhoff
   */
  @SuppressWarnings("unchecked")
  public class FunctoredMap implements Map {
      public FunctoredMap(Map map) {
          this.map = map;
      }
  
      public int hashCode() {
          return map.hashCode();
      }
  
      public String toString() {
          return map.toString();
      }
  
      public Collection values() {
          return map.values();
      }
  
      public Set keySet() {
          return map.keySet();
      }
  
      public Object get(Object key) {
          return onget.evaluate(map,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 src) {
          onputall.run(map, src);
      }
  
      public Set entrySet() {
          return map.entrySet();
      }
  
      public boolean containsKey(Object key) {
          return map.containsKey(key);
      }
  
      public boolean isEmpty() {
          return map.isEmpty();
      }
  
      public Object remove(Object key) {
          return onremove.evaluate(map,key);
      }
  
      public boolean equals(Object obj) {
          return map.equals(obj);
      }
  
      public boolean containsValue(Object value) {
          return map.containsValue(value);
      }
  
     // protected
 
     protected void setOnClear(UnaryProcedure procedure) {
         onclear = procedure;
     }
 
     protected void setOnPut(BinaryFunction function) {
         onput = function;
     }
 
     protected void setOnGet(BinaryFunction function) {
         onget = function;
     }
 
     protected void setOnPutAll(BinaryProcedure procedure) {
         onputall = procedure;
     }
 
     protected void setOnRemove(BinaryFunction function) {
         onremove = function;
     }
 
     // attributes
 
     protected static final BinaryFunction DEFAULT_ON_PUT = new BinaryFunction() {
         public Object evaluate(Object a, Object b) {
             Map map = (Map) a;
             Object key = Array.get(b,0);
             Object value = Array.get(b,1);
             return map.put(key,value);
         }
     };
 
     private BinaryFunction onput = DEFAULT_ON_PUT;
 
     protected static final BinaryFunction DEFAULT_ON_GET = new BinaryFunction() {
         public Object evaluate(Object map, Object key) {
             return ((Map) map).get(key);
         }
     };
 
     private BinaryFunction onget = DEFAULT_ON_GET;
 
     protected static final BinaryProcedure DEFAULT_ON_PUT_ALL = new BinaryProcedure() {
         public void run(Object a, Object b) {
             Map dest = (Map) a;
             Map src = (Map) b;
             dest.putAll(src);
         }
     };
 
     private BinaryProcedure onputall = DEFAULT_ON_PUT_ALL;
 
     protected static final BinaryFunction DEFAULT_ON_REMOVE = new BinaryFunction() {
         public Object evaluate(Object a, Object key) {
             Map map = (Map) a;
             return map.remove(key);
         }
     };
 
     private BinaryFunction onremove = DEFAULT_ON_REMOVE;
 
     protected static final UnaryProcedure DEFAULT_ON_CLEAR = new UnaryProcedure() {
         public void run(Object map) {
             ((Map) map).clear();
         }
     };
 
     private UnaryProcedure onclear = DEFAULT_ON_CLEAR;
 
     private Map map = null;
 
     // inner classes
 
     protected static class ContainsKey implements UnaryPredicate {
         ContainsKey(Map map) {
             this.map = map;
         }
 
         public boolean test(Object obj) {
             return map.containsKey(obj);
         }
 
         private Map map = null;
     }
 
     protected static class Throw implements Procedure, UnaryProcedure, BinaryProcedure {
         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(Object obj) {
             run();
         }
 
         public void run(Object a, Object b) {
             run();
         }
 
         private Class klass = null;
     }
 }