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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.javacc.UnicodeUtilities;
import com.yahoo.searchlib.rankingexpression.rule.Function;
import com.yahoo.tensor.Tensor;
import com.yahoo.tensor.TensorType;
/**
* A string value.
*
* @author bratseth
*/
public class StringValue extends Value {
private final String value;
/**
* Create a string value which is frozen at the outset.
*/
public static StringValue frozen(String value) {
StringValue stringValue=new StringValue(value);
stringValue.freeze();
return stringValue;
}
public StringValue(String value) {
this.value = UnicodeUtilities.unquote(value);
}
@Override
public TensorType type() { return TensorType.empty; }
/** Returns the hashcode of this, to enable strings to be encoded (with reasonable safely) as doubles for optimization */
@Override
public double asDouble() {
return value.hashCode();
}
@Override
public Tensor asTensor() {
return doubleAsTensor(asDouble());
}
@Override
public boolean hasDouble() { return true; }
@Override
public boolean asBoolean() {
throw new UnsupportedOperationException("A string value ('" + value + "') does not have a boolean value");
}
@Override
public Value negate() {
throw new UnsupportedOperationException("A string value ('" + value + "') cannot be negated");
}
@Override
public Value not() {
throw new UnsupportedOperationException("String values ('" + value + "') do not support not");
}
@Override
public Value or(Value value) {
throw new UnsupportedOperationException("String values ('" + value + "') do not support or");
}
@Override
public Value and(Value value) {
throw new UnsupportedOperationException("String values ('" + value + "') do not support and");
}
@Override
public Value largerOrEqual(Value argument) {
throw new UnsupportedOperationException("String values ('" + value + "') do not support greaterEqual");
}
@Override
public Value larger(Value argument) {
throw new UnsupportedOperationException("String values ('" + value + "') do not support greater");
}
@Override
public Value smallerOrEqual(Value argument) {
throw new UnsupportedOperationException("String values ('" + value + "') do not support lessEqual");
}
@Override
public Value smaller(Value argument) {
throw new UnsupportedOperationException("String values ('" + value + "') do not support less");
}
@Override
public Value approxEqual(Value argument) {
return new BooleanValue(this.asDouble() == argument.asDouble());
}
@Override
public Value notEqual(Value argument) {
return new BooleanValue(this.asDouble() != argument.asDouble());
}
@Override
public Value equal(Value argument) {
return new BooleanValue(this.asDouble() == argument.asDouble());
}
@Override
public Value add(Value value) {
return new StringValue(value + value.toString());
}
@Override
public Value subtract(Value value) {
throw new UnsupportedOperationException("String values ('" + value + "') do not support subtraction");
}
@Override
public Value multiply(Value value) {
throw new UnsupportedOperationException("String values ('" + value + "') do not support multiplication");
}
@Override
public Value divide(Value value) {
throw new UnsupportedOperationException("String values ('" + value + "') do not support division");
}
@Override
public Value modulo(Value value) {
throw new UnsupportedOperationException("String values ('" + value + "') do not support modulo");
}
@Override
public Value power(Value value) {
throw new UnsupportedOperationException("String values ('" + value + "') do not support ^");
}
@Override
public Value function(Function function, Value value) {
throw new UnsupportedOperationException("Mathematical functions cannot be applied on strings ('" + value + "')");
}
@Override
public Value asMutable() {
if ( ! isFrozen()) return this;
return new StringValue(value);
}
@Override
public String toString() {
return UnicodeUtilities.quote(value, '"');
}
@Override
public boolean equals(Object other) {
if (this==other) return true;
if ( ! (other instanceof StringValue)) return false;
return ((StringValue)other).value.equals(this.value);
}
@Override
public int hashCode() {
return value.hashCode();
}
/** Returns the value of this as a string */
public String asString() { return value; }
}
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