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package org.openslx.dozmod.util;
import java.util.Map;
import java.util.Map.Entry;
public class MapHelper {
private MapHelper() {
}
public static <K, T> boolean hasChanged(final Map<K, T> oldMap, final Map<K, T> newMap) {
return compare(oldMap, newMap) != 0;
}
public static <K, T> int compare(final Map<K, T> oldMap, final Map<K, T> newMap) {
if (oldMap == null && newMap == null)
return 0;
if (oldMap == null)
return -1;
if (newMap == null)
return 1;
if (oldMap.size() != newMap.size())
return oldMap.size() - newMap.size();
// Same amount of entries, check if any entry changed
int retval = 0;
for (Entry<K, T> entry : oldMap.entrySet()) {
T current = entry.getValue();
T other = newMap.get(entry.getKey());
if (other == null) {
retval -= 1;
continue;
}
retval += current.hashCode() - other.hashCode();
}
return retval;
}
}
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