module java.util.HashMap;

import java.lang.all;
import java.util.Map;
import java.util.Collection;
import java.util.Set;
import java.util.HashSet;
import java.util.ArrayList;

version(Tango){
    static import tango.util.container.HashMap;
    private struct ObjRef {
        Object obj;
        static ObjRef opCall( Object obj ){
            ObjRef res;
            res.obj = obj;
            return res;
        }
        public hash_t toHash(){
            return obj is null ? 0 : obj.toHash();
        }
        public equals_t opEquals( ObjRef other ){
            return obj is null ? other.obj is null : obj.opEquals( other.obj );
        }
        public equals_t opEquals( Object other ){
            return obj is null ? other is null : obj.opEquals( other );
        }
    }
} else { // Phobos
}

class HashMap : Map {
    // The HashMap  class is roughly equivalent to Hashtable, except that it is unsynchronized and permits nulls.
    version(Tango){
        alias tango.util.container.HashMap.HashMap!(ObjRef,ObjRef) MapType;
        private MapType map;
    } else { // Phobos
    }

    public this(){
        version(Tango){
            map = new MapType();
        } else { // Phobos
            implMissingInPhobos();
        }
    }
    public this(int initialCapacity){
        this();
    }
    public this(int initialCapacity, float loadFactor){
        version(Tango){
            map = new MapType(loadFactor);
        } else { // Phobos
            implMissingInPhobos();
        }
    }
    public this(Map m){
        this();
        putAll(m);
    }
    public void clear(){
        version(Tango){
            map.clear();
        } else { // Phobos
            implMissingInPhobos();
        }
    }
    public bool containsKey(Object key){
        version(Tango){
            ObjRef v;
            ObjRef keyr = ObjRef(key);
            return map.get(keyr, v );
        } else { // Phobos
            implMissingInPhobos();
            return false;
        }
    }
    public bool containsKey(String key){
        return containsKey(stringcast(key));
    }
    public bool containsValue(Object value){
        version(Tango){
            ObjRef valuer = ObjRef(value);
            return map.contains(valuer);
        } else { // Phobos
            implMissingInPhobos();
            return false;
        }
    }
    public Set  entrySet(){
        version(Tango){
            HashSet res = new HashSet();
            foreach( k, v; map ){
                res.add( new MapEntry(this,k.obj));
            }
            return res;
        } else { // Phobos
            implMissingInPhobos();
            return null;
        }
    }
    public override equals_t opEquals(Object o){
        version(Tango){
            if( auto other = cast(HashMap) o ){
                if( other.size() !is size() ){
                    return false;
                }
                foreach( k, v; map ){
                    auto vo = other.get(k.obj);
                    if( v != vo ){
                        return false;
                    }
                }
                return true;
            }
            return false;
        } else { // Phobos
            implMissingInPhobos();
            return false;
        }
    }
    public Object get(Object key){
        version(Tango){
            ObjRef keyr = ObjRef(key);
            if( auto v = keyr in map ){
                return (*v).obj;
            }
            return null;
        } else { // Phobos
            implMissingInPhobos();
            return null;
        }
    }
    public Object get(String key){
        return get(stringcast(key));
    }
    public override hash_t toHash(){
        return super.toHash();
    }
    public bool isEmpty(){
        version(Tango){
            return map.isEmpty();
        } else { // Phobos
            implMissingInPhobos();
            return false;
        }
    }
    public Set    keySet(){
        version(Tango){
            HashSet res = new HashSet();
            foreach( k, v; map ){
                res.add(k.obj);
            }
            return res;
        } else { // Phobos
            implMissingInPhobos();
            return null;
        }
    }
    public Object put(Object key, Object value){
        version(Tango){
            ObjRef valuer = ObjRef(value);
            ObjRef keyr = ObjRef(key);
            Object res = null;
            if( auto vold = keyr in map ){
                res = (*vold).obj;
            }
            map[ keyr ] = valuer;
            return res;
        } else { // Phobos
            implMissingInPhobos();
            return null;
        }
    }
    public Object put(String key, Object value){
        return put( stringcast(key), value );
    }
    public Object put(Object key, String value){
        return put( key, stringcast(value) );
    }
    public Object put(String key, String value){
        return put( stringcast(key), stringcast(value) );
    }
    public void   putAll(Map t){
        version(Tango){
            foreach( k, v; t ){
                map[ObjRef(k)] = ObjRef(v);
            }
        } else { // Phobos
            implMissingInPhobos();
        }
    }
    public Object remove(Object key){
        version(Tango){
            ObjRef keyr = ObjRef(key);
            if( auto v = keyr in map ){
                Object res = (*v).obj;
                map.removeKey(keyr);
                return res;
            }
            return null;
        } else { // Phobos
            implMissingInPhobos();
            return null;
        }
    }
    public Object remove(String key){
        return remove(stringcast(key));
    }
    public int    size(){
        version(Tango){
            return map.size();
        } else { // Phobos
            implMissingInPhobos();
            return 0;
        }
    }
    public Collection values(){
        version(Tango){
            ArrayList res = new ArrayList( size() );
            foreach( k, v; map ){
                res.add( v.obj );
            }
            return res;
        } else { // Phobos
            implMissingInPhobos();
            return null;
        }
    }

    public int opApply (int delegate(ref Object value) dg){
        version(Tango){
            int ldg( ref ObjRef or ){
                return dg( or.obj );
            }
            return map.opApply( &ldg );
        } else { // Phobos
            implMissingInPhobos();
            return 0;
        }
    }
    public int opApply (int delegate(ref Object key, ref Object value) dg){
        version(Tango){
            int ldg( ref ObjRef key, ref ObjRef value ){
                return dg( key.obj, value.obj );
            }
            return map.opApply( &ldg );
        } else { // Phobos
            implMissingInPhobos();
            return 0;
        }
    }

}