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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.searchlib.rankingexpression.evaluation;
import com.yahoo.searchlib.rankingexpression.RankingExpression;
import com.yahoo.searchlib.rankingexpression.Reference;
import com.yahoo.tensor.TensorType;
/**
* A variant of an array context variant which supports faster binding of variables but slower lookup
* from non-gbdt-optimized ranking expressions.
*
* @author bratseth
*/
public class DoubleOnlyArrayContext extends AbstractArrayContext {
/**
* Create a fast lookup context for an expression.
* This instance should be reused indefinitely by a single thread.
* This will fail if unknown values are attempted added.
*/
public DoubleOnlyArrayContext(RankingExpression expression) {
this(expression, false, defaultMissingValue);
}
public DoubleOnlyArrayContext(RankingExpression expression, boolean ignoreUnknownValues) {
this(expression, ignoreUnknownValues, defaultMissingValue);
}
/**
* Create a fast lookup context for an expression.
* This instance should be reused indefinitely by a single thread.
*
* @param expression the expression to create a context for
* @param ignoreUnknownValues whether attempts to put values not present in this expression
* should fail (false - the default), or be ignored (true)
* @param missingValue the value to return if not set.
*/
public DoubleOnlyArrayContext(RankingExpression expression, boolean ignoreUnknownValues, Value missingValue) {
super(expression, ignoreUnknownValues, missingValue);
}
/**
* Puts a value by name.
* The value will be frozen if it isn't already.
*
* @throws IllegalArgumentException if the name is not present in the ranking expression this was created with, and
* ignoredUnknownValues is false
*/
@Override
public final void put(String name, Value value) {
Integer index = nameToIndex().get(name);
if (index == null) {
if (ignoreUnknownValues())
return;
else
throw new IllegalArgumentException("Value '" + name + "' is not known to " + this);
}
put(index, value);
}
/** Same as put(index,DoubleValue.frozen(value)) */
public final void put(int index, double value) {
doubleValues()[index] = value;
clearMissing(index);
}
/** Puts a value by index. */
public final void put(int index, Value value) {
try {
put(index, value.asDouble());
}
catch (UnsupportedOperationException e) {
throw new IllegalArgumentException("This context only supports doubles, not " + value);
}
}
@Override
public TensorType getType(Reference reference) {
return TensorType.empty; // Double only
}
/** Perform a slow lookup by name */
@Override
public Value get(String name) {
Integer index = nameToIndex().get(name);
if (index==null) return missingValue;
return new DoubleValue(getDouble(index));
}
/** Perform a faster lookup by index */
@Override
public final Value get(int index) {
return new DoubleValue(getDouble(index));
}
/**
* Creates a clone of this context suitable for evaluating against the same ranking expression
* in a different thread (i.e, name name to index map, different value set.
*/
public DoubleOnlyArrayContext clone() {
return (DoubleOnlyArrayContext)super.clone();
}
}
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