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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.tensor;
import java.util.Arrays;
/**
* The sizes of a set of dimensions.
*
* @author bratseth
*/
public final class DimensionSizes {
private final long[] sizes;
private DimensionSizes(Builder builder) {
this.sizes = builder.sizes;
builder.sizes = null; // invalidate builder to avoid copying the array
}
/**
* Create sizes from a type containing bound indexed dimensions only.
*
* @throws IllegalStateException if the type contains dimensions which are not bound and indexed
*/
public static DimensionSizes of(TensorType type) {
Builder b = new Builder(type.rank());
for (int i = 0; i < type.rank(); i++) {
if ( type.dimensions().get(i).type() != TensorType.Dimension.Type.indexedBound)
throw new IllegalArgumentException(type + " contains dimensions without a size");
b.set(i, type.dimensions().get(i).size().get());
}
return b.build();
}
/**
* Returns the length of this in the nth dimension
*
* @throws IllegalArgumentException if the index is larger than the number of dimensions in this tensor minus one
*/
public long size(int dimensionIndex) {
if (dimensionIndex < 0 || dimensionIndex >= sizes.length)
throw new IllegalArgumentException("Illegal dimension index " + dimensionIndex +
": This has " + sizes.length + " dimensions");
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 long totalSize() {
long productSize = 1;
for (long 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 dimensionIndex = 0;
private long[] sizes;
public Builder(int dimensions) {
this.sizes = new long[dimensions];
}
public Builder set(int dimensionIndex, long size) {
sizes[dimensionIndex] = size;
return this;
}
public Builder add(long size) {
sizes[dimensionIndex++] = size;
return this;
}
/**
* Returns the length of this in the nth dimension
*
* @throws IllegalArgumentException if the index is larger than the number of dimensions in this tensor minus one
*/
public long size(int dimensionIndex) {
if (dimensionIndex <0 || dimensionIndex >= sizes.length)
throw new IllegalArgumentException("Illegal dimension index " + dimensionIndex +
": This has " + sizes.length + " dimensions");
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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