// The MIT License (MIT)

//

// Copyright (c) 2016 Robert C. Seacord

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in all

// copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

// SOFTWARE.

package MET08J;

class xCard extends card {

final private String type;

private xCard(int number, String type) {

super(number);

this.type = type;

}

@Override

public boolean equals(Object o) {

if (!(o instanceof card)) {

return false;

}

// Normal Card, do not compare type

if (!(o instanceof xCard)) {

return o.equals(this);

}

// It is an xCard, compare type as well

xCard xc = (xCard)o;

return super.equals(o) && xc.type == this.type;

}

// Comply with MET09-J

@Override

public int hashCode() {

/* ... */

return 0;

}

public static void main(String[] args) {

xCard p1 = new xCard(1, "type1"); //$NON-NLS-1$

card p2 = new card(1);

xCard p3 = new xCard(1, "type2"); //$NON-NLS-1$

// p1 and p2 compare equal and p2 and p3 compare equal,

// but p1 and p3 compare unequal, violating the transitivity requirement.

// The problem is that the Card class has no knowledge of the XCard class

// and consequently cannot determine that p2 and p3 have different values

// for the field type.

System.out.println(p1.equals(p2)); // Returns true

System.out.println(p2.equals(p3)); // Returns true

System.out.println(p1.equals(p3)); // Returns false

// violating transitivity

}

}