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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;
/**
* This function is an instruction to negate its argument.
*
* @author baldersheim
* @author Simon Thoresen Hult
*/
public class StrLenFunctionNode extends UnaryFunctionNode {
public static final int classId = registerClass(0x4000 + 130, StrLenFunctionNode.class);
/**
* Constructs an empty result node. <b>NOTE:</b> This instance is broken until non-optional member data is set.
*/
public StrLenFunctionNode() {
}
/**
* Constructs an instance of this class with given argument.
*
* @param arg The argument for this function.
*/
public StrLenFunctionNode(ExpressionNode arg) {
addArg(arg);
}
@Override
public void onPrepareResult() {
setResult(new IntegerResultNode(0));
}
@Override
public void onPrepare() {
super.onPrepare();
}
@Override
public boolean onExecute() {
((IntegerResultNode)getResult()).setValue(getArg().getResult().getString().length());
return true;
}
@Override
protected int onGetClassId() {
return classId;
}
@Override
protected boolean equalsUnaryFunction(UnaryFunctionNode obj) {
return true;
}
}
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