panda.lang.collection.MultiKey Maven / Gradle / Ivy
package panda.lang.collection;
import panda.lang.Arrays;
/**
*/
public class MultiKey {
private final Object[] keys;
private int hashCode;
/**
* Constructs an instance of MultipartKey to hold the specified objects.
*
* @param keys the set of objects that make up the key. Each key may be null.
*/
public MultiKey(final Object... keys) {
this.keys = keys;
for (final Object key : keys) {
if (key != null) {
hashCode = hashCode * 7 + key.hashCode();
}
}
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(final Object obj) {
// Eliminate the usual boilerplate because
// this inner static class is only used in a generic ConcurrentHashMap
// which will not compare against other Object types
return Arrays.equals(keys, ((MultiKey)obj).keys);
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
return hashCode;
}
}