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am 162fabbc: Let Pair represent null values.

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* commit '162fabbcf81157fddab1c38de09bdabaff8c068a':
  Let Pair represent null values.
This commit is contained in:
Jeff Sharkey
2012-09-06 23:17:29 -07:00
committed by Android Git Automerger
parent b601bfc13b 162fabbcf8
commit 6fcfbf8aff
1 changed files with 17 additions and 16 deletions
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33
core/java/android/util/Pair.java
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@@ -16,6 +16,8 @@
package android.util; package android.util;
import libcore.util.Objects;
/** /**
* Container to ease passing around a tuple of two objects. This object provides a sensible * Container to ease passing around a tuple of two objects. This object provides a sensible
* implementation of equals(), returning true if equals() is true on each of the contained * implementation of equals(), returning true if equals() is true on each of the contained
@@ -26,8 +28,8 @@ public class Pair<F, S> {
public final S second; public final S second;
/** /**
* Constructor for a Pair. If either are null then equals() and hashCode() will throw * Constructor for a Pair.
* a NullPointerException. *
* @param first the first object in the Pair * @param first the first object in the Pair
* @param second the second object in the pair * @param second the second object in the pair
*/ */
@@ -37,31 +39,30 @@ public class Pair<F, S> {
} }
/** /**
* Checks the two objects for equality by delegating to their respective equals() methods. * Checks the two objects for equality by delegating to their respective
* @param o the Pair to which this one is to be checked for equality * {@link Object#equals(Object)} methods.
* @return true if the underlying objects of the Pair are both considered equals() *
* @param o the {@link Pair} to which this one is to be checked for equality
* @return true if the underlying objects of the Pair are both considered
* equal
*/ */
@Override
public boolean equals(Object o) { public boolean equals(Object o) {
if (o == this) return true; if (!(o instanceof Pair)) {
if (!(o instanceof Pair)) return false;
final Pair<F, S> other;
try {
other = (Pair<F, S>) o;
} catch (ClassCastException e) {
return false; return false;
} }
return first.equals(other.first) && second.equals(other.second); Pair<?, ?> p = (Pair<?, ?>) o;
return Objects.equal(p.first, first) && Objects.equal(p.second, second);
} }
/** /**
* Compute a hash code using the hash codes of the underlying objects * Compute a hash code using the hash codes of the underlying objects
*
* @return a hashcode of the Pair * @return a hashcode of the Pair
*/ */
@Override
public int hashCode() { public int hashCode() {
int result = 17; return (first == null ? 0 : first.hashCode()) ^ (second == null ? 0 : second.hashCode());
result = 31 * result + first.hashCode();
result = 31 * result + second.hashCode();
return result;
} }
/** /**