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package com.yahoo.tensor.impl;
import com.yahoo.tensor.TensorAddress;
import java.util.Arrays;
import java.util.stream.Collectors;
public final class NumericTensorAddress extends TensorAddress {
private static final String [] SMALL_INDEXES = createSmallIndexesAsStrings(1000);
private final long[] labels;
private static String[] createSmallIndexesAsStrings(int count) {
String [] asStrings = new String[count];
for (int i = 0; i < count; i++) {
asStrings[i] = String.valueOf(i);
}
return asStrings;
}
private NumericTensorAddress(long[] labels) {
this.labels = labels;
}
public static NumericTensorAddress of(long ... labels) {
return new NumericTensorAddress(Arrays.copyOf(labels, labels.length));
}
public static NumericTensorAddress unsafeOf(long ... labels) {
return new NumericTensorAddress(labels);
}
@Override
public int size() { return labels.length; }
@Override
public String label(int i) { return asString(labels[i]); }
@Override
public long numericLabel(int i) { return labels[i]; }
@Override
public TensorAddress withLabel(int index, long label) {
long[] labels = Arrays.copyOf(this.labels, this.labels.length);
labels[index] = label;
return new NumericTensorAddress(labels);
}
@Override
public String toString() {
return "cell address (" + Arrays.stream(labels).mapToObj(NumericTensorAddress::asString).collect(Collectors.joining(",")) + ")";
}
public static String asString(long index) {
return ((index >= 0) && (index < SMALL_INDEXES.length)) ? SMALL_INDEXES[(int)index] : String.valueOf(index);
}
}
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