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Cons.java
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83 lines (75 loc) · 1.96 KB
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package soot.util;
/*-
* #%L
* Soot - a J*va Optimization Framework
* %%
* Copyright (C) 2004 Ondrej Lhotak
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 2.1 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* <http://www.gnu.org/licenses/lgpl-2.1.html>.
* #L%
*/
/** A Lisp-style cons cell. */
public final class Cons<U, V> {
final private U car;
final private V cdr;
public Cons(U car, V cdr) {
this.car = car;
this.cdr = cdr;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((car == null) ? 0 : car.hashCode());
result = prime * result + ((cdr == null) ? 0 : cdr.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if ((obj == null) || (getClass() != obj.getClass())) {
return false;
}
@SuppressWarnings("unchecked")
Cons<U, V> other = (Cons<U, V>) obj;
if (car == null) {
if (other.car != null) {
return false;
}
} else if (!car.equals(other.car)) {
return false;
}
if (cdr == null) {
if (other.cdr != null) {
return false;
}
} else if (!cdr.equals(other.cdr)) {
return false;
}
return true;
}
public U car() {
return car;
}
public V cdr() {
return cdr;
}
@Override
public String toString() {
return car.toString() + "," + cdr.toString();
}
}