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package com.yahoo.tensor;
import com.google.common.annotations.Beta;
import java.util.Arrays;
/**
* The sizes of a set of dimensions.
*
* @author bratseth
*/
@Beta
public final class DimensionSizes {
private final int[] sizes;
private DimensionSizes(Builder builder) {
this.sizes = builder.sizes;
builder.sizes = null; // invalidate builder to avoid copying the array
}
/**
* Returns the length of this in the nth dimension
*
* @throws IndexOutOfBoundsException if the index is larger than the number of dimensions in this tensor minus one
*/
public int size(int dimensionIndex) { return sizes[dimensionIndex]; }
/** Returns the number of dimensions this provides the size of */
public int dimensions() { return sizes.length; }
/** Returns the product of the sizes of this */
public int totalSize() {
int productSize = 1;
for (int dimensionSize : sizes )
productSize *= dimensionSize;
return productSize;
}
@Override
public boolean equals(Object o) {
if (o == this) return true;
if (!(o instanceof DimensionSizes)) return false;
return Arrays.equals(((DimensionSizes) o).sizes, this.sizes);
}
@Override
public int hashCode() { return Arrays.hashCode(sizes); }
/**
* Builder of a set of dimension sizes.
* Dimensions whose size is not set before building will get size 0.
*/
public final static class Builder {
private int[] sizes;
public Builder(int dimensions) {
this.sizes = new int[dimensions];
}
public Builder set(int dimensionIndex, int size) {
sizes[dimensionIndex] = size;
return this;
}
/**
* Returns the length of this in the nth dimension
*
* @throws IndexOutOfBoundsException if the index is larger than the number of dimensions in this tensor minus one
*/
public int size(int dimensionIndex) { return sizes[dimensionIndex]; }
/** Returns the number of dimensions this provides the size of */
public int dimensions() { return sizes.length; }
/** Build this. This builder becomes invalid after calling this. */
public DimensionSizes build() { return new DimensionSizes(this); }
}
}
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