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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.tensor;
import com.google.common.annotations.Beta;
import com.google.common.collect.ImmutableList;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
/**
* An immutable address to a tensor cell. This simply supplies a value to each dimension
* in a particular tensor type. By itself it is just a list of cell labels, it's meaning depends on its accompanying type.
*
* @author bratseth
*/
@Beta
public abstract class TensorAddress implements Comparable<TensorAddress> {
public static TensorAddress of(String[] labels) {
return new StringTensorAddress(labels);
}
public static TensorAddress of(int ... labels) {
return new IntTensorAddress(labels);
}
/** Returns the number of labels in this */
public abstract int size();
/**
* Returns the i'th label in this
*
* @throws IllegalArgumentException if there is no label at this index
*/
public abstract String label(int i);
/**
* Returns the i'th label in this as an int.
* Prefer this if you know that this is an integer address, but not otherwise.
*
* @throws IllegalArgumentException if there is no label at this index
*/
public abstract int intLabel(int i);
public abstract TensorAddress withLabel(int labelIndex, int label);
public final boolean isEmpty() { return size() == 0; }
@Override
public int compareTo(TensorAddress other) {
// TODO: Formal issue (only): Ordering with different address sizes
for (int i = 0; i < size(); i++) {
int elementComparison = this.label(i).compareTo(other.label(i));
if (elementComparison != 0) return elementComparison;
}
return 0;
}
@Override
public int hashCode() {
int result = 1;
for (int i = 0; i < size(); i++)
result = 31 * result + label(i).hashCode();
return result;
}
@Override
public boolean equals(Object o) {
if (o == this) return true;
if ( ! (o instanceof TensorAddress)) return false;
TensorAddress other = (TensorAddress)o;
if (other.size() != this.size()) return false;
for (int i = 0; i < this.size(); i++)
if ( ! this.label(i).equals(other.label(i)))
return false;
return true;
}
/** Returns this as a string on the appropriate form given the type */
public final String toString(TensorType type) {
StringBuilder b = new StringBuilder("{");
for (int i = 0; i < size(); i++) {
b.append(type.dimensions().get(i).name()).append(":").append(label(i));
b.append(",");
}
if (b.length() > 1)
b.setLength(b.length() - 1);
b.append("}");
return b.toString();
}
private static final class StringTensorAddress extends TensorAddress {
private final String[] labels;
private StringTensorAddress(String ... labels) {
this.labels = Arrays.copyOf(labels, labels.length);
}
@Override
public int size() { return labels.length; }
@Override
public String label(int i) { return labels[i]; }
@Override
public int intLabel(int i) {
try {
return Integer.parseInt(labels[i]);
}
catch (NumberFormatException e) {
throw new IllegalArgumentException("Expected an int label in " + this + " at position " + i);
}
}
@Override
public TensorAddress withLabel(int index, int label) {
String[] labels = Arrays.copyOf(this.labels, this.labels.length);
labels[index] = String.valueOf(label);
return new StringTensorAddress(labels);
}
@Override
public String toString() {
return Arrays.toString(labels);
}
}
private static final class IntTensorAddress extends TensorAddress {
private final int[] labels;
private IntTensorAddress(int[] labels) {
this.labels = Arrays.copyOf(labels, labels.length);
}
@Override
public int size() { return labels.length; }
@Override
public String label(int i) { return String.valueOf(labels[i]); }
@Override
public int intLabel(int i) { return labels[i]; }
@Override
public TensorAddress withLabel(int index, int label) {
int[] labels = Arrays.copyOf(this.labels, this.labels.length);
labels[index] = label;
return new IntTensorAddress(labels);
}
@Override
public String toString() {
return Arrays.toString(labels);
}
}
/** Supports building of a tensor address */
public static class Builder {
private final TensorType type;
private final String[] labels;
public Builder(TensorType type) {
this(type, new String[type.dimensions().size()]);
}
private Builder(TensorType type, String[] labels) {
this.type = type;
this.labels = labels;
}
/**
* Adds a label in a dimension to this.
*
* @return this for convenience
*/
public Builder add(String dimension, String label) {
Objects.requireNonNull(dimension, "Dimension cannot be null");
Objects.requireNonNull(label, "Label cannot be null");
Optional<Integer> labelIndex = type.indexOfDimension(dimension);
if ( ! labelIndex.isPresent())
throw new IllegalArgumentException(type + " does not contain dimension '" + dimension + "'");
labels[labelIndex.get()] = label;
return this;
}
/** Creates a copy of this which can be modified separately */
public Builder copy() {
return new Builder(type, Arrays.copyOf(labels, labels.length));
}
public TensorAddress build() {
for (int i = 0; i < labels.length; i++)
if (labels[i] == null)
throw new IllegalArgumentException("Missing a value for dimension " +
type.dimensions().get(i).name() + " for " + type);
return TensorAddress.of(labels);
}
}
}
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