/**
* Returns {@code true} if the two integer vectors are equal to one another. Two {@code Vector}
* insances are considered equal if they contain the same number of elements and all corresponding
* pairs of {@code int} values are equal.
*/
public static boolean equals(IntegerVector v1, IntegerVector v2) {
if (v1.length() == v2.length()) {
int length = v1.length();
for (int i = 0; i < length; ++i) {
if (v1.get(i) != v2.get(i)) return false;
}
return true;
}
return false;
}
/**
* Creates a copy of a given {@code IntegerVector} with the same type as the original.
*
* @param source The {@code Vector} to copy.
* @return A copy of {@code source} with the same type.
*/
public static IntegerVector copyOf(IntegerVector source) {
IntegerVector result = null;
if (source instanceof TernaryVector) {
TernaryVector v = (TernaryVector) source;
int[] pos = v.positiveDimensions();
int[] neg = v.negativeDimensions();
result =
new TernaryVector(
source.length(), Arrays.copyOf(pos, pos.length), Arrays.copyOf(neg, neg.length));
} else if (source instanceof SparseVector) {
result = new SparseHashIntegerVector(source.length());
copyFromSparseVector(result, source);
} else {
result = new DenseIntVector(source.length());
for (int i = 0; i < source.length(); ++i) result.set(i, source.get(i));
}
return result;
}
/**
* Copies values from a {@code SparseVector} into another vector
*
* @param destination The {@code Vector to copy values into.
* @param source The {@code @SparseVector} to copy values from.
*/
private static void copyFromSparseVector(IntegerVector destination, IntegerVector source) {
int[] nonZeroIndices = ((SparseVector) source).getNonZeroIndices();
for (int index : nonZeroIndices) destination.set(index, source.get(index));
}