/**
* Compares the specified Object with the receiver. Returns true if and only if the specified
* Object is also an ArrayList of the same type, both Lists have the same size, and all
* corresponding pairs of elements in the two Lists are identical. In other words, two Lists are
* defined to be equal if they contain the same elements in the same order.
*
* @param otherObj the Object to be compared for equality with the receiver.
* @return true if the specified Object is equal to the receiver.
*/
public boolean equals(Object otherObj) { // delta
// overridden for performance only.
if (!(otherObj instanceof ByteArrayList)) return super.equals(otherObj);
if (this == otherObj) return true;
if (otherObj == null) return false;
ByteArrayList other = (ByteArrayList) otherObj;
if (size() != other.size()) return false;
byte[] theElements = elements();
byte[] otherElements = other.elements();
for (int i = size(); --i >= 0; ) {
if (theElements[i] != otherElements[i]) return false;
}
return true;
}
/**
* Removes from the receiver all elements that are contained in the specified list. Tests for
* identity.
*
* @param other the other list.
* @return <code>true</code> if the receiver changed as a result of the call.
*/
public boolean removeAll(AbstractByteList other) {
// overridden for performance only.
if (!(other instanceof ByteArrayList)) return super.removeAll(other);
/*
* There are two possibilities to do the thing a) use other.indexOf(...)
* b) sort other, then use other.binarySearch(...)
*
* Let's try to figure out which one is faster. Let M=size,
* N=other.size, then a) takes O(M*N) steps b) takes O(N*logN + M*logN)
* steps (sorting is O(N*logN) and binarySearch is O(logN))
*
* Hence, if N*logN + M*logN < M*N, we use b) otherwise we use a).
*/
if (other.size() == 0) {
return false;
} // nothing to do
int limit = other.size() - 1;
int j = 0;
byte[] theElements = elements;
int mySize = size();
double N = (double) other.size();
double M = (double) mySize;
if ((N + M) * cern.jet.math.Arithmetic.log2(N) < M * N) {
// it is faster to sort other before searching in it
ByteArrayList sortedList = (ByteArrayList) other.clone();
sortedList.quickSort();
for (int i = 0; i < mySize; i++) {
if (sortedList.binarySearchFromTo(theElements[i], 0, limit) < 0)
theElements[j++] = theElements[i];
}
} else {
// it is faster to search in other without sorting
for (int i = 0; i < mySize; i++) {
if (other.indexOfFromTo(theElements[i], 0, limit) < 0) theElements[j++] = theElements[i];
}
}
boolean modified = (j != mySize);
setSize(j);
return modified;
}
/**
* Returns a deep copy of the receiver.
*
* @return a deep copy of the receiver.
*/
public Object clone() {
// overridden for performance only.
ByteArrayList clone = new ByteArrayList((byte[]) elements.clone());
clone.setSizeRaw(size);
return clone;
}
