--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/cl/maps/duplex/DuplexKey.java	Fri May 08 16:36:25 2015 +0200
@@ -0,0 +1,81 @@
+package cl.maps.duplex;
+
+
+public class DuplexKey<A, B> {
+	
+	private A aKey;
+	private B ownKey;
+	
+	public DuplexKey(A aKey, B ownKey){
+		this.aKey = aKey;
+		this.ownKey = ownKey;
+	}
+	
+	public boolean equalsAKey(A key){
+		if(aKey != null && key != null){
+			return aKey.equals(key);
+		}else if(aKey == null && key == null){
+			return true;
+		}
+		return false;
+	}
+	
+	public boolean equalsOwnKey(B key){
+		if(ownKey != null && key != null){
+			return ownKey.equals(key);
+		}else if(ownKey == null && key == null){
+			return true;
+		}
+		return false;
+	}
+	
+	public A getAKey() {
+		return aKey;
+	}
+
+	public void setAKey(A aKey) {
+		this.aKey = aKey;
+	}
+
+	public B getOwnKey() {
+		return ownKey;
+	}
+
+	public void setOwnKey(B ownKey) {
+		this.ownKey = ownKey;
+	}
+	
+	@Override
+	public boolean equals(Object o){
+		if(o instanceof DuplexKey){
+			try {
+				DuplexKey<A, B> other = (DuplexKey<A, B>)o;
+				
+				if(this.equalsOwnKey(other.getOwnKey()) &&
+						this.equalsAKey(other.getAKey())){
+					return true;
+				}	
+			} catch (Exception e) {}
+			
+		}
+		return false;
+	}
+	
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + ((aKey == null) ? 0 : aKey.hashCode());
+		result = prime * result + ((ownKey == null) ? 0 : ownKey.hashCode());
+		
+		return result;
+	}
+
+	@Override
+	public String toString() {
+		if (aKey == null || ownKey == null) {
+			return super.toString();
+		}
+		return "DuplexKey [" + aKey.toString() + ", " + ownKey.toString() + "]";
+	}
+}