Android/frameworks_base
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Let Pair represent null values.

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Bug: 7121262
Change-Id: I067ea0a4af40a0e8935a9408404df7a2e851e22c
This commit is contained in:
Jeff Sharkey
2012-09-06 20:32:16 -07:00
parent 1a9c0dfdbb
commit 162fabbcf8
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;
import libcore.util.Objects;
/**
* 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
@@ -26,8 +28,8 @@ public class Pair<F, S> {
public final S second;
/**
* Constructor for a Pair. If either are null then equals() and hashCode() will throw
* a NullPointerException.
* Constructor for a Pair.
*
* @param first the first 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.
* @param o the Pair to which this one is to be checked for equality
* @return true if the underlying objects of the Pair are both considered equals()
* Checks the two objects for equality by delegating to their respective
* {@link Object#equals(Object)} methods.
*
* @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) {
if (o == this) return true;
if (!(o instanceof Pair)) return false;
final Pair<F, S> other;
try {
other = (Pair<F, S>) o;
} catch (ClassCastException e) {
if (!(o instanceof Pair)) {
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
*
* @return a hashcode of the Pair
*/
@Override
public int hashCode() {
int result = 17;
result = 31 * result + first.hashCode();
result = 31 * result + second.hashCode();
return result;
return (first == null ? 0 : first.hashCode()) ^ (second == null ? 0 : second.hashCode());
}
/**