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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.expression;
import com.yahoo.vespa.objects.Deserializer;
import com.yahoo.vespa.objects.ObjectVisitor;
import com.yahoo.vespa.objects.Serializer;
/**
* This function is an instruction to negate its argument.
*
* @author baldersheim
* @author Simon Thoresen Hult
*/
public class MathFunctionNode extends MultiArgFunctionNode {
// Make sure these match the definition in c++ searchlib/src/searchlib/expression/mathfunctionnode.h.
public static enum Function {
EXP(0),
POW(1),
LOG(2),
LOG1P(3),
LOG10(4),
SIN(5),
ASIN(6),
COS(7),
ACOS(8),
TAN(9),
ATAN(10),
SQRT(11),
SINH(12),
ASINH(13),
COSH(14),
ACOSH(15),
TANH(16),
ATANH(17),
CBRT(18),
HYPOT(19),
FLOOR(20);
private final int id;
private Function(int id) {
this.id = id;
}
private static Function valueOf(int id) {
for (Function fnc : values()) {
if (id == fnc.id) {
return fnc;
}
}
return null;
}
}
public static final int classId = registerClass(0x4000 + 136, MathFunctionNode.class);
private Function fnc;
@SuppressWarnings("UnusedDeclaration")
public MathFunctionNode() {
this(Function.LOG);
}
public MathFunctionNode(Function fnc) {
this(null, fnc);
}
public MathFunctionNode(ExpressionNode exp, Function fnc) {
this.fnc = fnc;
if (exp != null) {
addArg(exp);
}
}
@Override
protected boolean onExecute() {
getArg(0).execute();
double result = 0.0;
switch (fnc) {
case EXP:
result = Math.exp(getArg(0).getResult().getFloat());
break;
case POW:
result = Math.pow(getArg(0).getResult().getFloat(), getArg(1).getResult().getFloat());
break;
case LOG:
result = Math.log(getArg(0).getResult().getFloat());
break;
case LOG1P:
result = Math.log1p(getArg(0).getResult().getFloat());
break;
case LOG10:
result = Math.log10(getArg(0).getResult().getFloat());
break;
case SIN:
result = Math.sin(getArg(0).getResult().getFloat());
break;
case ASIN:
result = Math.asin(getArg(0).getResult().getFloat());
break;
case COS:
result = Math.cos(getArg(0).getResult().getFloat());
break;
case ACOS:
result = Math.acos(getArg(0).getResult().getFloat());
break;
case TAN:
result = Math.tan(getArg(0).getResult().getFloat());
break;
case ATAN:
result = Math.atan(getArg(0).getResult().getFloat());
break;
case SQRT:
result = Math.sqrt(getArg(0).getResult().getFloat());
break;
case SINH:
result = Math.sinh(getArg(0).getResult().getFloat());
break;
case ASINH:
throw new IllegalArgumentException("Inverse hyperbolic sine(asinh) is not supported in java");
case COSH:
result = Math.cosh(getArg(0).getResult().getFloat());
break;
case ACOSH:
throw new IllegalArgumentException("Inverse hyperbolic cosine (acosh) is not supported in java");
case TANH:
result = Math.tanh(getArg(0).getResult().getFloat());
break;
case ATANH:
throw new IllegalArgumentException("Inverse hyperbolic tangents (atanh) is not supported in java");
case FLOOR:
result = Math.floor(getArg(0).getResult().getFloat());
break;
case CBRT:
result = Math.cbrt(getArg(0).getResult().getFloat());
break;
case HYPOT:
result = Math.hypot(getArg(0).getResult().getFloat(), getArg(1).getResult().getFloat());
break;
}
((FloatResultNode)getResult()).setValue(result);
return true;
}
@Override
public void onPrepareResult() {
setResult(new FloatResultNode());
}
@Override
protected int onGetClassId() {
return classId;
}
@Override
protected void onSerialize(Serializer buf) {
super.onSerialize(buf);
buf.putByte(null, (byte)fnc.id);
}
@Override
protected void onDeserialize(Deserializer buf) {
super.onDeserialize(buf);
int b = buf.getByte(null);
fnc = Function.valueOf(b & 0xff);
}
@Override
protected boolean equalsMultiArgFunction(MultiArgFunctionNode obj) {
return fnc == ((MathFunctionNode)obj).fnc;
}
@Override
public MathFunctionNode clone() {
MathFunctionNode obj = (MathFunctionNode)super.clone();
obj.fnc = fnc;
return obj;
}
@Override
public void visitMembers(ObjectVisitor visitor) {
super.visitMembers(visitor);
visitor.visit("function", fnc);
}
}
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